E) The most significant and prevalent greenhouse gas is water vapor. Ozone, carbon dioxide, methane, nitrous oxide, and other gases are also present.
Which major source of greenhouse gases is it?Over the past 150 years, almost all of the rise in atmospheric greenhouse gases has been caused by human activities. Burning fossil fuels for transportation, electricity, and heating is the primary human activity in the United States that contributes to the emission of greenhouse gases.
Which four greenhouse gases have the greatest impact?The greenhouse gases on Earth warm the planet by storing heat in the atmosphere. Carbon dioxide, methane, nitrous oxide, and water vapor—all of which are found naturally—as well as fluorinated gases—which are made—are the main gases that cause the greenhouse effect.
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How many atoms of K are present in 195. 49 grams of K?
O 3. 0110 x 1024
O 6. 0220 x 1024
O 1. 1772 x 1026
0 4. 5797 x 1027
The number of K atoms present in 195.49 grams of K is 3.0110 × 10²⁴ atoms. The correct option is a 3.0110 x 10²⁴.
We are to determine the number of K atoms present in 195.49 grams of K.
First, we will determine the number of moles K present
number of moles =[tex]\frac{mass}{molar mass}[/tex]
Atomic mass of K = 39.0983 g/mol
Number of moles of K present = [tex]\frac{195.49}{39.09}[/tex]
Number of moles of K present = 4.99996 moles
Number of moles of K present ≅ 5 moles
Now, for the number of atoms present
From the formula
Number of atoms = Number of atoms × Avogadro's constant
Number of K atoms present = 5 × 6.022 × 10²³
Number of K atoms present = 5 × 6.022 × 10²³
Number of K atoms present = 30.11 × 10²³
Number of K atoms present = 3.0110 × 10²⁴ atoms
Hence, the number of K atoms present in 195.49 grams of K is 3.0110 × 10²⁴ atoms. The correct option is a 3.0110 x 10²⁴.
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Hydrogen bonds are an especially strong type of dipole-dipole interaction What are oil and water examples of
An exceptionally potent type of dipole-dipole interaction is hydrogen bonding. Oil and water are examples of the effects of hydrogen bonding.
Hydrogen bonding are a type of dipole-dipole interaction that occur between the hydrogen atoms of one molecule and the nitrogen or oxygen atoms of another molecule. They are relatively strong interactions, about 5-10% as strong as a covalent bond, and are responsible for the unique properties of many biological molecules, such as DNA and proteins. Oil and water are examples of substances that demonstrate the effects of hydrogen bonding. Water molecules are polar, meaning that they have a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atoms. This polarity allows water molecules to form hydrogen bonds with one another, giving water its high surface tension and making it a good solvent for polar substances. Oil, on the other hand, is composed of non-polar molecules such as alkanes and alkenes, which do not form hydrogen bonds with one another. As a result, oil is immiscible with water and will float on top of it, because it does not have the same kind of attractive forces between its molecules as water does, and also the oil molecules have a low polarity. In summary, hydrogen bonds are a type of dipole-dipole interaction that are relatively strong, and oil and water are examples of substances that demonstrate the effects of hydrogen bonding. Water molecules can form hydrogen bonds with one another, giving it the properties of high surface tension and making it a good solvent for polar substances, while oil is composed of non-polar molecules and it is immiscible with water, having low polarity.
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Suppose that a chemist combines 231 mL of methane and 907 mL of chlorine at STP in a 2.00 L flask. The flask is then allowed to stand at 298 K. If the reaction reaches 75.9% completion, what is the total pressure in the flask
The total pressure in the flask is 1.320 times the total pressure.
What is pressure?Pressure is an important concept in chemistry, as it affects the physical behavior of gases and solids, and the rates at which reactions occur. Pressure is a measure of the force applied to an area, typically expressed in units of atmospheres (atm), or kilopascals (kPa).
Methane :
Mole fraction of methane = (231 mL / 2.00 L) = 0.1155
Partial pressure of methane = 0.1155 * Ptotal
Chlorine:
Mole fraction of chlorine = (907 mL / 2.00 L) = 0.4535
Partial pressure of chlorine = 0.4535 * Ptotal
Products:
Mole fraction of products = (75.9% com) = 0.759
Partial pressure of products = 0.759 * Ptotal
Total pressure = 0.1155*Ptotal + 0.4535*Ptotal + 0.759*Ptotal = 1.320*Ptotal
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A controlled experiment _____.Group of answer choicesIs repeated many times to ensure that the results are accurateProceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental dataIncludes at least two groups, one of which does not receive the experimental treatmentIncludes at least two groups, one differing from the other by two or more variables
An experimental group and a control group are both included in a controlled experiment. At least one of the two groups—the group that is not subjected to the experimental treatment—is present in a controlled experiment.
In controlled experiment, the researcher wants to determine how one or more variables affects on something. Since many different variables affecting the results, and most of them are not of interest to the researcher, and they will kept under control. They must remain constant. There must be at least of two groups. One of them is control group, and the other one is experimental group.
During experiment, a researcher compares between two groups. Both are composed of individuals which is coming from same population, so they are very identical in all the aspects except for independent variables that the researcher changes in to the experimental group and they observe that how they will affect the individuals. Control group is used to identify any of the other factors influencing the results which is obtained in the study, apart from the modified variables of the treatment. Independent variable keeps constant in control group.
The experimental group receives the treatment. The researcher voluntarily modifies the independent variable's values to see how it impacts the subjects. There can be several experimental groups.
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The statement "atoms have a small, dense nucleus" is true. What evidence do scientists use to prove this statement as true?
Most alpha particles shot at gold foil go straight through, without any changes in their direction.
The particles ejected in Thomson's experiment bent away from the negatively charged plates, but toward positively charged plates.
A few alpha particles shot at gold foil bounce in the opposite direction
No matter which element Thomson put in a cathode ray tube, the same negative particles with the same properties (such as charge and mass) were ejected.
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option C.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
The statement "atoms have a small, dense nucleus" is true. A few alpha particles shot at gold foil bounce in the opposite direction is the evidence.
Therefore, the correct option is option C.
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What is the mass of 2.80 x 10 ^23 molecules of CO2?
The answer is 20.46g.
As we know that
1 mole of CO2 has 6.02 x 10^23 molecules of CO2.
Now, let's say x moles of CO2 has 2.80 x 10^23 molecules of CO2.
Therefore,
x = 2.80 x 10^23 / 6.02 x 10^23 = 0.465
As, M = nmr
M = 0.465 *( 12 + 2x16)
= 0.465 *( 12 + 32)
= 0.465 * 44
= 20.46g
1
4
2
What are the relative masses of a proton, neutron
and electron, given that a proton has a mass of 1?
How many protons, neutrons and electrons are
there in an atom of phosphorus, which has a proton
number of 15 and a mass number of 31?
3
Explain the terms atom and element, and include
a clear description of the relationship between the
two terms.
Explain why neutrons are important in making the
nucleus of an atom stable. You need to consider the
charges on the different subatomic particles present.
Answer:
Explanation:
A proton has a relative mass of 1. A neutron has a relative mass of 1. An electron has a relative mass of 1/1840. (accept 0)
An atom of phosphorus, which has a proton mass number of 31 has 15 protons, 15 electrons, and 16 neutrons.
Atom- The fundamental units of matter are atoms. They have a single nucleus, which is surrounded by a small number of protons and electrons.
Element- A species of atom known as an element is one that cannot decompose further. They only contain one kind of atom with the same quantity of protons.
Role of Neutron-
Neutron's charge is neutral. The element's mass is made up of protons and neutrons.
The neutrons' main function in an atom's nucleus is to contribute to the nuclear glue or binding energy that binds the nucleus itself together. Remember that protons and neutrons make up an atomic nucleus.
Positively charged protons don't get along with one another.
Neutrons are added to the structure to make up for the so-called mass deficit in order to counteract the protons' attractive forces.
In order to keep the nucleus together, the nucleons—the protons and neutrons in a nucleus—lose a little bit of mass that is transformed into binding energy.
Proton has relative mass of 1 while neutron has relative mass of 1. While that of an electron has relative mass of 1/1840.In phosphorous there are 15 electrons , protons and 16 neutrons.Atoms of same type combine to form element.Neutrons contribute to mass of atom hence change in number will make atom unstable.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
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In a typical IR spectrum, what name describes the units shown on the x-axis? a. wavenumber b. relative abundance c. %transmittance d. ppm e. intensity
In a typical IR spectrum, wavenumber name describes the units shown on the x-axis.
According to common understanding, IR includes wavelengths between the notional red edge of the visible spectrum, which is at a frequency of 430 THz, and 1 millimeter (300 GHz) (although the longer IR wavelengths are often designated rather as terahertz radiation ).The spatial frequency of a wave is measured in cycles per unit distance (common wavenumber) or radians per unit distance, and is also known as the wavenumber or repetency[1] (angular wavenumber).It is comparable to temporal frequency, which is determined by the quantity of radians or wave cycles per unit of time (ordinary frequency) (angular frequency).
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how many liters of water can be made from 55 grams of oxygen gas and an excess of hydrogen at a pressure of 12.4 atm
At a pressure of 12.4 atm and a temperature of 850 c, 8.2 liters of water can be created from 55 grams of oxygen gas and an excess of hydrogen.
first, we need the no.of moles of O2 = mass/molar mass of O2
= 55 g / 32 g/mol
= 1.72 mol
from the balanced equation of the reaction:
2H2 (g) + O2(g) → 2H2O(g)
we can see that the molar ratio between O2: H2O = 1: 2
So we can get the no.of moles of H2O = 2 * moles of O2
= 2 * 1.72 mol
= 3.44 mol
So by substitution by this value in the ideal gas formula:
PV = nRT
when P = 12.4 atm & n H2O = 3.44 mol & R= 0.0821 & T = 85 + 273=358K
12.4 atm *V = 3.44 * 0.0821 * 358 = 8.15 L
∴ V ≈ 8.2 L
In the physical sciences, pressure is defined as the perpendicular force per unit area or stress at a point within a confined fluid. The pressure exerted on a floor by a 42-pound box with a bottom area of 84 square inches is equal to the force divided by the area over which it is exerted, or one-half pound per square inch.
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Express the answers to the following operations with the proper number of significant figures.
4. 108 x 5. 3
____ X 10^
The answer to the given operations with proper number of significant figures is 5.7 × 10².
Significant figures or numbers can be defined as those particular numbers or digits which are essential in determining the accuracy of a particular value. For example, 4.392 has 4 significant figures.
When we are rounding off a number to write it with the proper number of significant figures, we first need to decide the amount of significant figures that it should have.
On calculating the given operation,
⇒ 108 × 5.3 = 572.4
In significant figures,
= 5.72 × 10²
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18) Write the expression: the sum of the quantity h and 2 divided by 4. A) h 4 2 B) h 2 4 C) h 2 4 D) 4 h 2
The expression is [tex]\frac{(h+2)}{4}[/tex] which can be solved by BODMAS rule
The abbreviation BODMAS, which stands for "Brackets, Order of powers or roots, Division, and Multiplication," is followed by the BODMAS rule. A stands for addition and S for subtraction. According to the BODMAS rule, multi-step mathematical statements must be solved in the BODMAS order from left to right. Similar to how Addition and Subtraction depend on which comes first in the sentence, Division and Multiplication are thought of as interchangeable operations.
The expression can be written as follows WE have 2 quantities h and 2
Their sum can be written as h+2 Now We have the sum divided by 4 so it can be written as : [tex]\frac{(h+2)}{4}[/tex]
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A sample of an unknown substance contains 24. 0 grams of carbon and 2. 0 grams of hydrogen. A sample of another unknown substance contains 24. 0 grams of carbon and 6. 0 grams of hydrogen. Which law does this observation demonstrate
The law that demonstrates this observation is the law of definite proportions.
Law of definite proportion states that a given chemical compound continually incorporates its element factors in constant ratio (with the aid of using mass) and does now no longer rely on its supply and technique of preparation. Law of Definite Proportions states that during a given kind of chemical substance, the factors are continually blended withinside the identical proportions with the aid of using mass. The Law of Definite Proportions applies while factors are reacted collectively to shape the identical product. Such as , a sample of an unknown substance contains 24. 0 grams of carbon and 2. 0 grams of hydrogen.
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Problems that can be caused by both the complete and incomplete
combustion of methane in a gas fire.
Answer:
carbon dioxide produced, or carbon monoxide, soot produced and Soot can cause breathing problems and it blackens buildings.
Explanation:
During complete combustion carbon and hydrogen combine with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). During incomplete combustion part of the carbon is not completely oxidized producing soot or carbon monoxide (CO).
How can distance be measured?
Distance can be measured by centimeters (cm) and kilometers (km).
Distance is defined as the total movement of an object without any regard to the direction. Distance is the length of the route between the two points.
SI unit of distance is the meter (m). Short distances may be measured in the centimeters (cm), and the long distances may be measured in kilometers (km). For example: Measure the distance from the bottom to the top of a sheet of paper in centimeters and the distance from your house to your school. Maps are also used to measure the the distance.
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CH4 + 2 Cl₂ →→ 4 HCl + C
4. Use the equation above to calculate how many moles of CH4 are required to
produce 3.6 moles of HCl. (2 pts)
By using given equation 0.9 moles of CH₄ are required to produce 3.6 moles of HCl.
In simple terms, what is a chemical reaction?The transformation of one or more reactants, also known as reactants, into one or more new products, also known as products, occurs during a chemical reaction.
Chemical reactions turn reactants into products by involving reactants in the process. As an illustration, when we breathe, oxygen is inhaled, and upon coming into contact with glucose, it reacts to create carbon dioxide, water, and energy.
Given chemical reaction:
CH₄ + 2 Cl₂ → 4 HCl + C
1 mole of CH₄ gives 4 moles of HCl
x moles of CH₄ gives 3.6 moles
x moles of CH₄ = 3.6/4
x moles of CH₄ = 0.9moles.
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Balance the following equation. Do
H₂+NO → H₂O + N₂
✓
V
V2 + 2NO → 2H2O + N2 The equation is balanced by adding an additional coefficient (2) to the hydrogen (H2) and water (H2O) molecules on the product side.
What is balanced?Balanced is a term used to describe a state of equilibrium or harmony. It implies a situation where all elements are in proportion and none are out of place or dominant. This could describe a healthy diet that provides a balance of proteins, carbohydrates, and fats, or a successful family life where time is shared between work, play, and private activities. Balance is also a key factor in physical and mental health, when all aspects of life are in alignment it allows for a more fulfilling and enjoyable experience.
This ensures that the number of atoms of each element is equal on both sides of the equation. In other words, the number of atoms of hydrogen (H2) and water (H2O) molecules on the left side of the equation must be equal to the number of atoms of hydrogen (H2) and water (H2O) molecules on the right side of the equation.
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Why is bromine the most reactive?
Being a highly chemically reactive metal having seven valence electrons and even a high attraction for electrons, bromine reacts quickly as well as violently with alkali metals, therefore is rarely found in nature pure.
Despite being a potent oxidizer, it is difficult to break down under typical circumstances. Fluorine was the strongest active halogen, followed by chlorine, bromine, as well as iodine.
Since bromine has a higher atomic radius over chlorine, it is much less reactive. Compared to chlorine, bromine does not hold electrons as tightly. This is supported by the fact that chlorine contains fewer electron shells, which causes the electrons to connect nearer to the nucleus.
Due to its lower reactivity, the bromine radical is so much more selective for such 2° radical. Cl• is much less picky and less selective since it is less stable as well as more reactive.
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A principle of value stream mapping is to concentrate on speeding up value-added operations.
True/False
False. Value streaming mapping technique is used to analyze the flow of information, people and material required to bring a product to a consumer.
The value stream mapping is a series of steps. Value stream mapping provides a structured visualization of the key steps and corresponding data needed to understand and intelligently make improvements that optimize the entire process. Value stream is a series of steps that occur to provide the product or service that customers wants. Value stream mapping enables us to understand where the value is added, where it’s not and more importantly, how to improve upon the collective process.
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Prior to Thomson's discovery, the atom was thought to be indivisible. Explain the significance of Thomson's concept of the electron.
In 1897, J.J. Thomson's discovery of the electron was revolutionary.
What is thomson's concept?Thomson's concept of the electron showed that the atom was not indivisible, but instead was composed of smaller particles. This discovery provided the first piece of evidence to support the atomic theory, which states that all matter is made up of atoms.
Thomson's concept of the electron also allowed scientists to understand the behaviour of electricity better. Electrons are negatively charged particles, and Thomson's discovery showed that electricity is a flow of electrons. This knowledge allowed scientists to create new technologies based on the understanding of electrons, such as computers and cell phones.
The significance of Thomson's concept of the electron can be summed up in three words: evidence, electricity, and technology. Thomson's discovery provided the first piece of evidence for the atomic theory, allowed for a better understanding of electricity, and paved the way for the creation of many new technologies.
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Select the correct answer.
How does substituting a hydrogen atom with a halogen in a hydrocarbon affect the resulting compound?
A.
All the single bonds in the original molecule change to double bonds.
B.
The boiling point of the new compound increases.
C.
The bonds between the carbon atoms in the molecule become weaker.
D.
The resulting compound is called a saturated hydrocarbon.
E.
The substitution allows each carbon atom to accept more than four valence electrons.
Answer:
E. The substitution allows each carbon atom to accept more than four valence electrons.
Explanation:
Halogens (except for fluorine) have seven valence electrons, which gives them the flexibility to participate in more than four covalent bonds. Hydrogen only has one valence electron, so it tends to form only four covalent bonds. In a substitution reaction, each halogen provides the carbon atom with additional electrons, allowing it to accept more than the usual four.
Answer:
C. The bonds between the carbon atoms in the molecule become weaker.
Explanation:
Why don't we draw a double bond between the Be and Cl atoms in the Lewis structure for BeCl2? a. That would give each Cl a positive formal charge and the Be a negative formal charge b. There aren't enough electrons in the molecule to do so. c. That would result in an expanded octet for beryllium.
d. That would result in an expanded octet for chlorine.
Lone electron pairs are absent from the Be atom. A negative formal charge would be placed on the Be atom as a result of the double bonds existing between it and the Cl atom.
Why is it necessary to go over the formal charges that each atom has in the Lewis diagram?When compared to an isolated neutral atom, the number of electrons that are attached to an atom in a molecule determines its formal charge.
Why is the octet rule broken by becl2?The octet rule is broken by B e C l 2, as the boron should be in a valence state that enables it to attach to three chlorines. However, in this molecule, the boron is joined by six electrons.
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The reaction of solid sodium metal with gaseous diatomic chlorine produces common table salt and lots of heat. The chemical equation for this reaction is best written as
The chemical equation for this reaction is best written as: Na (s) + Cl2 (g) → NaCl (s) + Heat
What is reaction?Reaction is a process in which one or more substances are changed into one or more different substances. It is a chemical or physical change that occurs in response to a stimulus. Reactions can be used to create new materials or to break down existing materials into simpler components. They can also be used to generate energy or to store energy. Reactions can be either spontaneous or non-spontaneous, depending on the conditions in which they occur.
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Solve the following equation for X. Remember to balance the equation. Xe + 2F2 -> X In the above question we see the reaction between Xe and fluorine gas F2. Interestingly, Xenon has a high affinity for oxygen, and xenon fluorides are known to undergo hydrolysis to give the hydrohalic acid and the rare gas oxide similar to the following equation: XeF6 + 3H2O -> X + 6HF
xenon fluorides are known to undergo hydrolysis to give the hydrohalic acid and the rare gas oxide similar to the following equation: XeF6 + 3H2O -> XeO3 + 6HF.
A noble gas compound with the formula XeF6 is xenon hexafluoride. It is one of xenon's three binary fluorides, along with XeF2 and XeF4. All known are exergonic and stable at normal temperatures. The series' strongest fluorinating agent is XeF6.Water's chemical formula is H2O, which means that each of its molecules consists of two hydrogen atoms and one oxygen atom. In its +6 oxidation state, xenon can form the unstable chemical xenon trioxide(XeO3). It is an extremely potent oxidizing agent that slowly releases oxygen from water, a process that is sped up by sunshine. When it comes into touch with organic materials, it explodes dangerously. It emits xenon and oxygen gas when it explodes.
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what are the two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances?
The two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances are mass (m) and volume (V).
To calculate the unit factor, we need to divide the unit of the desired quantity by the unit of the given quantity. For example, to convert from mass to volume, the unit factor is V/m.
This unit factor can then be used to convert mass to volume or vice versa. Dimensional analysis helps us to determine the proper units for a given equation and to convert from one unit to another.
It also allows us to compare different units of measurement and to check that the units in both sides of an equation match. This is especially useful in chemical calculations, where it is important to ensure the correct units are used.
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Base your answer on the choices below. (A) Pauli exclusion principle (B) Heisenberg uncertainty principle (C) Hund's rule (D) Wave nature of matter Which is responsible for interference patterns being exhibited by electrons
Wave nature of matter is responsible for interference pattern being exhibited by electrons.
Shortly after de Broglie proposed the wave nature of matter, two scientists at Bell Labs, C.J. showed experimentally that electrons can exhibit wave-like behavior. The wave-like motion of electrons is mathematically described by the so-called Bloch wave function. Named after his 20th-century physicist Felix Bloch, who first described the behavior of electrons in crystalline solids, these wavefunctions are complex. That is, it has both real and imaginary components.
These waves are called matter waves because electrons are a type of matter. Here,we relate the quantitative features of matter waves to familiar and measurable physical quantities such as energy, mass, and momentum.
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What is the definition of meter in biology?
The definition of the meter in biology is that the meter scale is used to measure the length. it is first unit of the international system of the units.
The meter is the first unit of the length in the international system of the units. currently the definition of the meter is : The meter can be defined as the length of the path that is travelled by the light in the vacuum during the time interval of 1 / 2999792458 second. The symbol of the meter is m.
The meter scale is used to measure the length or the distance between the two points.
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If you double the total amount of Na ions, but you also double the amount of water they are dissolved in, __________.
Na ion concentration will remain constant if you increase the overall number of Na ions while also increasing the volume of water in which they are dissolved.
The amount of material in a certain area is referred to as concentration in chemistry. Another definition states that concentration is the ratio of a solution's solute to its entire solution or solvent. Mass per unit volume is a common way to express concentration. However, moles or units of volume can also be used to express the solute concentration. Concentration could be per unit mass instead of volume. Concentration can be computed for any mixture, despite often being used with chemical solutions.
By mathematically dividing the mass, moles, or volume of the solute by the mass, moles, or volume of the solution, one may calculate the concentration (or, less commonly, the solvent).
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Carefully feel the sides of the flask. Is the crystallization of sodium acetate endothermic or exothermic? How do you know?
Answer:
It is not possible to determine whether the crystallization of sodium acetate is endothermic or exothermic simply by feeling the sides of the flask. To determine the heat of crystallization, you would need to measure the temperature of the solution before and after crystallization and compare the two values.
The heat of crystallization is defined as the heat absorbed or released during the process of crystal formation from a solution or a melt. If heat is absorbed during the process, the reaction is endothermic and the temperature of the solution or melt will decrease. If heat is released, the reaction is exothermic and the temperature will increase.
In the case of sodium acetate, it is an exothermic reaction, meaning that heat is released during crystallization and the temperature of the solution will increase. This is because the process of forming the crystal lattice requires the breaking of hydrogen bonds and other intermolecular forces, which releases energy.
Explanation:
Answer:
exothermic
Explanation:
When you crystallize the solution, sodium acetate forms a new bond from the soluble aqueous state ( Na+ and C2H3O2- ) to the solid state (NaC2H3O2). Forming bonds in chemistry is generally an exothermic reaction.
An extremely efficient enzyme has a ____ KM and a ____ kcat.
An extremely efficient enzyme has a small KM and a large kcat.
The conversion rate at the lowest substrate concentration is measured in kcat/km. This interpretation is accurate. kcat/Km is a good indicator of an enzyme's effectiveness since it takes into account both the enzyme's maximum rate, kcat, and its affinity for its substrate (Km).The turnover number, or the number of molecules that may be created per second per active site, of an enzyme is provided by the formula k c a t / kM.Because the substrate concentration is almost usually much greater than the Km, in many situations, enzymes are only better when they have a larger kcat. It seems disingenuous to me to use the ratio when this is plainly the case, yet it still happens much too frequently. It could serve as a useful benchmark when compared to enzymes in particular situations.
complete question:An extremely efficient enzyme has a _____ KM and a _____ kcat.
A) small; small
B) small; large
C) large; large
D) large; small
E) kcat and KM do nothing to predict the efficiency of an enzyme
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Which sample contains the greatest number of molecules?
A 4g of hydrogen
B 18 g of water
C 24 dm³ of oxygen
D 66 g of carbon dioxide
And why is the answer that way?
Answer:
4g of hydrogen
Explanation:
4g of hydrogen (molar mass 2) corresponds to 2 moles of molecules or 4N number of atoms where N is the Avogadro's number (6.023×10
23)