How to pass chem!!!!!!!!!!
Answer:
refer to below
Explanation:
- read your textbook! especially the topics that are most confusing
- as you read, make sure to take notes/make an outline. write the words from the text in your own words. In chem, the textbook explanations are usually very detailed, so putting it in your own words will help you remember and understand what you write.
- make sure you really understand the concepts. don't just memorize what you read.
- draw diagrams and structures. seeing how things are structured will help you visualize what you learn
- ask questions to your teacher. if there is anything confusing, make sure to refer to your teacher as they will hopefully be able to explain it so it won't be confusing
These tips have helped me pass chem with an A. Hope all of this helped!
Answer:
Explanation:
Study material, ask for help, read textbook and do practice problems, get a tutor, beg your teacher for marks,
Balance this reaction:
___Naz3(PO4)+ ___K(OH) ---> ___Na(OH) +___K3(PO4)
describe two sources of energy and explain how they work
please help me (50points)
Solar energy:-
In this way the energy generated through sun light with the help of solar panels and to be used in many works.
Wind energy:-
This is generated by moving turbines with windmills .It is used to create electric energy
un MODELO ATÓMICO es:
a. Una esfera con partículas positivas y negativas
b. La estructura mínima de la materia.
c. Una serie de descubrimientos.
d. La representación de un átomo donde se explica su comportamiento y características.
Answer:
Creo que es D pero no tan segura
Explanation:
Two dogs, one with spots and one with no spots have the same mass and
are running with different velocities. Dog 1 (Dog with no spots) has a
velocity of 1 m/s while Dog 2 (Dog with spots) has a velocity of 2 m/s.
Which dog has a larger kinetic energy and how much larger is its kinetic
energy compared to the other dog
Answer:
dog 2 because it is running 1m faster a second than dog 1. Dog 2 can run 1 meter farther in a second than the other dog.
Air trapped in a cylinder fitted with a piston occupies 142.8 mL at 0.97 kPa pressure.
What is the new volume of air when the pressure is increased to 1.5 kPa by applying force
to the piston?
Answer:
92.344mL
Explanation:
acording to boyle's law that PV=constant then P1V1=P2V2
ASAP: The main difference between the gravitational force and electrical force is that
1. Gravitational force can only push
2. Gravitational force can pull and push
3. Electrical force can only pull
4. Electrical force can pull and push
Answer:
Electrical force can pull and push
Explanation:
5. How are the members of Kingdom Archaebacteria different from the
members of Kingdom Plantae?
A. They don't have a nucleus.
B. They don't have cells.
C. They don't need water to live.
6. Where would you probably NOT find a member of the Kingdom
Archaebacteria?
A. In a deep ocean vent.
B. In a very salty lake.
C. On your skin
Answer:
5. C
6. B
Explanation:
sana nakatulong
Archaebacteria do not have a nucleus and the probability of their presence on skin is very low.
What are Archaebacteria?Ancient bacteria called archaebacteria live in harsh conditions.They are distinguished by the absence of peptidoglycan in their cell walls.Unlike all other creatures, their plasma membrane has branching lipids.What is the classification of archaebacteria?They are divided into thermoacidophiles, halophiles, and methanogens.
Where can archaebacteria be found?They are found in harsh environments and are known as extremophiles.They can be found in deep ocean vent.They can be found in very salty lakes.What is the presence on human skin?Archaeal 16 S rRNA genes were found on the skin of every human subject, contributing for up to 4.23 percent of the recovered prokaryotic microbiome.
How are the members of Kingdom Archaebacteria different from the members of Kingdom Plantae?The members of Archaebacteria do not have a nucleus.Therefore option a is correctWhere would you probably not find a member of the kingdom archaebacteria?The probability of the presence of archaebacteria on skin is very low.Therefore, option c is correct.To learn more about archaebacteria, nucleus, and peptidoglycan here,
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Explain why people tend to wear light- colored clothing during the warmer months of the year. Use evidence and scientific reasoning to support your answer
Answer:
because dark colours like black attract light (sun) and heat. light colors reflect more light, (it absorbs less energy and heat from the sun)
Answer:
Because Black color absorbs light better than light-colored.
for example have you ever seen the black car on the road if you touch it very hotter than white car
1. White is the most reflective color. Does not absorb heat like black Make the house not hot.
2. White has the least radiation exposure. Therefore, during the winter night, it will help retain heat for a while. 3. Because white absorbs light as little as possible. Causing the pigment to deteriorate slowly Unlike black that absorbs light well. Causing the color to deteriorate and fade quickly until noticeable
4. If the house next to you is painted white during the day, it will help reflect light into the house.
Why that black color absorbs heat? Even though it abosrbs the light? It comes from the principle that (Substance or material) Black is what absorbs (absorbs) light in every technology.
It absorbs all widths of light, including infrared light. (The infrared itself is hot.)
Black repels self-heating the most because of all colors of light. But there is justice.
Write the overall balanced equation for the reaction:
N2O4(g) + CO → NO(g) + CO2(g)+NO2(g)
Answer:
This reaction has infinite ways to be balanced
Explanation:
To balance this equation we can use the algebraic method:
N2O4(g) + CO → NO(g) + CO2(g)+NO2(g)
Where we write each molecule as a letter:
A + B → C + D + E
Then, we write the equations according the number of atoms of each molecule. That is:
Oxygen → 4A + B = C + 2D + 2E (1)
Nitrogen → 2A = C + E (2)
Carbon → B = D (3)
Then, we have to give 1 arbitral number for a letter. For example:
B = 1; D = 1
(1) 4A + 1 = C + 2 + 2E
4A = C + 2E + 1
2A = C + E (2) Twice (2):
4A = 2C + 2E
Subtracting (1) in (2)
C + 2E + 1 = 2C + 2E
C + 1 = 2C
1 = C
Si 1 = C:
4A + 1 = 1 + 2 + 2E
4A = 2 + 2E (1)
y:
2A = 1 + E (2)
Twice:
4A = 2 + 2E
As (1) and (2) are the same equation:
This reaction has infinite ways to be balancedFor example:
N2O4(g) + CO → NO(g) + CO2(g)+NO2(g)
Write the balanced equation for the equilibrium reaction for the dissociation ofsilver chloride in water, and write the K expression for this reaction. Then create an ICE chart. Since we know the equilibrium concentration of the silver ion, we can solve for Ksp.Does it agree with the literature value
Answer:
See explanation
Explanation:
Hello there!
In this case, since the the concentrations are not given, and not even the Ksp, we can solve this problem by setting up the chemical equation, the equilibrium constant expression and the ICE table only:
[tex]AgCl(s)\rightleftharpoons Ag^+(aq)+Cl^-(aq)[/tex]
Next, the equilibrium expression according to the produced aqueous species as the solid silver chloride is not involved in there:
[tex]Ksp=[Ag^+][Cl^-][/tex]
And therefore, the ICE table, in which x stands for the molar solubility of the silver chloride:
[tex]\ \ \ \ \ \ \ \ \ \ \ \ \ \ AgCl(s)\rightleftharpoons Ag^+(aq)+Cl^-(aq)[/tex]
I - 0 0
C - +x +x
E - x x
Which leads to the following modified equilibrium expression:
[tex]Ksp=x^2[/tex]
Unfortunately, values were not given, and they cannot be arbitrarily assigned or assumed.
Regards!
Your friend says that the animal in this picture is a predator. What are 2 questions you can ask your friend to help prove that this animal is a predator.
please help please please please please please please please please please please please please please please please please please please please.
NO LINKS PLEASE PLEASE .
Answer: Does the animal prey on other animals? Is the animal a carnivore?
A body of mass 0.5kg is thrown vertically upwards
from the ground with an Initial velocity of 80.m/s
Calculate
" the potential energy at B 80.0cm above the ground
Here's the solution,
we know,
potential energy = mgh
where,
m = mass = 0.5 kgg = acc due to gravity = 9.8 m/s²h = height = 0.8 m (80 cm)So,
=》
[tex]p.e = 0.5 \times 9.8 \times 0.8[/tex]
=》
[tex]p.e = 3.92 \: \: joules[/tex]
Use the following balanced equation to answer the question: 2 ZnS + 3 O2 →2 ZnO + 2 SO2 When 56.25 grams of ZnS react, how many moles of O2 are produced?
Answer:
[tex]n_{O_2}=0.866molSO_2\\\\n_{SO_2}=0.577molSO_2[/tex]
Explanation:
Hello there!
In this case, according to the given balanced chemical reaction by which ZnS reacts with O2, it is possible to calculate the moles of the latter that are consumed, not produced, according the 2:3 mole ratio between them and the following stoichiometric set up:
[tex]n_{O_2}=56.25gZnS*\frac{1molZnS}{97.47gZnS}*\frac{3molO_2}{2molZnS} \\\\n_{O_2}=0.866molO_2[/tex]
But also, we can compute the moles of SO2 that are produced via the the 2:2 mole ratio of ZnS to SO2:
[tex]n_{SO_2}=56.25gZnS*\frac{1molZnS}{97.47gZnS}*\frac{2molSO_2}{2molZnS} \\\\n_{SO_2}=0.577molSO_2[/tex]
Regards!
If the mass defect for a radionuclide is –8.7839×10-30 kg, what's the binding energy per atom?
Question 7 options:
A)
–7.8944×10-13 J/atom
B)
–4.76×1011 J/atom
C)
–7.8944×10-13 kJ/atom
D)
7.8944×10-13 J/atom
Answer:
A) –7.8944×10-13 J/atom
Explanation:
Mass defect of a radionuclide (m)
[tex]=-8.7839[/tex]×[tex]10^{-30} kg[/tex]
Formula for binding energy
[tex]E=mc^{2}[/tex]
[tex]=(-8.7839x10^{-30} kg)(3x10^{8} m/s)^{2}[/tex]
[tex]E=-7.8944x10^{-13} J/atom[/tex]
If the mass defect for a radionuclide is – 8.7839 × 10⁻³° kg, the binding energy per atom will be –7.8944 × 10⁻¹³ J/atom. The correct option is A.
What is radionuclide?A radionuclide is an unstable nuclide because it contains so much charge. The excess energy is used by the gamma radiation by the nucleus, the electron uses energy to move to another orbital.
Radionuclides are particles that are used to scanning or monitor the radioactive chemicals that are in the body due to swallowing or inhaling.
The binding energy per atom can be calculated by the formula
The mass of defect of a radionuclide (m) is – 8.7839 × 10⁻³° kg
E = mc²
E = – 8.7839 × 10⁻³° x 3 x 10⁸ m/s
E = –7.8944 × 10⁻¹³ J/atom.
Thus, the correct option is A. –7.8944×10-13 J/atom.
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Which of the following statements about energy is FALSE?
A. Energy can be converted from one type to another.
B. The total energy of a system remains constant.
C. Energy is the capacity to do work.
D. Kinetic energy is the energy associated with its position or composition
E. Systems tend to change in order to lower their potential energy
According to law of conservation of energy, the statement which is false is kinetic energy is the energy associated with its position or composition.
According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
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where do you think water vapor in air comes from?
How many liters of SO2 will be produced from 26.9L O2?
Answer:
26.9L of SO2
Explanation:
The reaction between Sulphur and oxygen is as follows:
[tex]S_2 + 2O_2 \to 2SO_2[/tex]
This implies that:
2 moles of oxygen reacts with 1 mole of sulphur to produce 2 moles of SO₂
2 moles of oxygen also yields 2 moles of SO₂
The number of moles of oxygen given is determined as:
[tex]= 26.9 \ L \ of \ O _2 \times (\dfrac{1 \ mol \ of O_2 }{22.4 \ L}) \\\\ = 1.20 \ mol \ of \ O_2[/tex]
The number of moles of SO₂ by using the ratio is:
[tex]= 1.20 \ mol \ of \ O_2 \times (\dfrac{1 \ mol \ of \ SO_2 }{1 \ mol \ O_2}) \\ \\ = 1.20 \ mol \ of SO_2[/tex]
Finally, the volume by applying the new moles is computed as:
[tex]= 1.20 \ moles \ of \ O_2 \times ( \dfrac{1 \ mo \ of \ SO_2}{1 \ mol \ of O_2}) \times ( \dfrac{22.4 }{1 \ mol }) \\ \\ = 26.9 \ L \ of \ SO_2[/tex]
Hydrogen gas is collected over water in an inverted buret. If the atmospheric pressure is 745 mm Hg, the vapor pressure of water is 18 mm Hg, and a 15.0 cm-high column of water remains in the buret, the pressure of the hydrogen gas is Hydrogen gas is collected over water in an inverted buret. If the atmospheric pressure is 745 mm Hg, the vapor pressure of water is 18 mm Hg, and a 15.0 cm-high column of water remains in the buret, the pressure of the hydrogen gas is:________
a. 745 mm Hg.
b. less than 727 mm Hg.
c. 763 mm.
d. 727 mm Hg.
Answer:
[tex]P_{H_2}=727mmHg[/tex]
Explanation:
Hello there!
In this case, according to the given data, it is possible to infer that the gas mixture lies on the 15.0 cm-high column of water, so that the total pressure or atmospheric pressure is given by:
[tex]P_{atm}=P_{water}+P_{H_2}[/tex]
Thus, since the atmospheric pressure is 745 mmHg and the vapor pressure of water is 18 mmHg, the pressure of hydrogen turns out to be:
[tex]P_{H_2}=P_{atm}-P_{water}\\\\P_{H_2}=745mmHg-18mmHg\\\\P_{H_2}=727mmHg[/tex]
Best regards!
PLEASE HELP WILL MARK BRAINLEST!!!!
Answer: c????????
Explanation:
The pressure on 200 milliliters of a gas at constant
temperature is changed from 380 torr to 760 torr. The new
volume of the gas is
answerA) 100 mL
Explanation:
At constant temperature and number of moles, Using Boyle's law
Given ,
V₁ = 200 mL
V₂ = ?
P₁ = 60 kPa
P₂ = 120 kPa
The new volume of the gas is 100mL
Boyle's law is use to calculate the volume of a gas in relation with its pressure. The Boyle's law equation is as follows:
P1V1 = P2V2
Where;
P1 = initial pressure of the gas (torr)
P2 = final pressure of the gas (torr)
V1 = initial volume of the gas (mL)
V2 = final volume of the gas (mL)
According to the information of this question, the pressure on 200mL of a gas changed from 380 torr to 760 torr. Hence;
V1 = 200mL
V2 = ?
P1 = 380torr
P2 = 760torr
Using P1V1 = P2V2
V2 = P1V1/P2
V2 = (380 × 200) ÷ 760
V2 = 76000 ÷ 760
V2 = 100mL
Hence, the new volume of the gas is 100mL
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Which type of metal ions tends to absorb light in the visible range?
Transition metal ions tends to absorb light in the visible range.
What are Transition Metals?Transition metal is defined as an element having a d subshell that is partially filled with electrons, or an element that has the ability to form stable cations with an incompletely filled d orbital.
The transition metals are located towards the middle of the periodic table between the highly reactive metals and the noble gases.
They are the only elements that may use electrons in the next to highest—as well as the highest—energy level as valence electrons.
Transition metals are unusual in having very similar properties even with different numbers of valence electrons.
Therefore, Transition metal ions tends to absorb light in the visible range.
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When 16.35 moles of SI reacts with 11.26 moles of N2, how many moles of SI3N4 are formed
Answer:
5.450 mol Si₃N₄
Explanation:
Step 1: Write the balanced equation
3 Si + 2 N₂ ⇒ Si₃N₄
Step 2: Establish the theoretical molar ratio between the reactants
The theoretical molar ratio of Si to N₂ is 3:2 = 1.5:1.
Step 3: Establish the experimental molar ratio between the reactants
The experimental molar ratio of Si to N₂ is 16.35:11.26 = 1.45:1. Comparing both molar ratios, we can see that Si is the limiting reactant.
Step 4: Calculate the moles of Si₃N₄ produced from 16.35 moles of Si
The molar ratio of Si to Si₃N₄ is 3:1.
16.35 mol Si × 1 mol Si₃N₄/3 mol Si = 5.450 mol Si₃N₄
2. The number of molecules in 1.0 mole of So2 is the same as the number of molecules in:
(1) 1.0 mole of N2
(2) 2.0 moles of Ne
(3) 0.25 mole of NO2
(4) 0.50 mole of NH3
Please show work and explain!
Answer:
1.0 moles of N2
Explanation:
since
1.0 × avogadro's no# = same answer for SO2 and N2
avogadro's no#= 6.02× 10²³
The number of molecules in 1.0 mole of SO₂ is the same as the number of molecules in (3) 0.25 mole of NO₂.
Option (3) is correct.
Avogadro's number, approximately 6.022 x 10²³, represents the number of molecules or atoms in one mole of any substance. In this case, 1.0 mole of SO₂ contains the same number of molecules as any other substance with 1.0 mole, such as 1.0 mole of N₂ or 2.0 moles of Ne.
However, when comparing different moles of substances, we can use the concept of stoichiometry and molar ratios to determine the number of molecules. Given that 1 mole of SO₂ is equivalent to 1 mole of NO₂, 0.25 mole of NO₂ would also contain the same number of molecules as 1 mole of SO₂. Therefore, the number of molecules in 1.0 mole of SO₂ is the same as the number of molecules in 0.25 mole of NO₂.
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Explain the oxygen cycle. I’m in the 6th grade I need a answer please
Answer:
Oxygen cycle, along with the carbon cycle and nitrogen cycle plays an essential role in the existence of life on the earth. The oxygen cycle is a biological process which helps in maintaining the oxygen level by moving through three main spheres of the earth which are:
Atmosphere Lithosphere BiosphereExplanation:
The atmosphere is the layer of gases presents above the earth’s surface. The sum of Earth’s ecosystems makes a biosphere. Lithosphere is the solid outer section along with the earth’s crust and it is the largest reservoir of oxygen.
Answer:
Oxygen cycle, circulation of oxygen in various forms through nature. ... Free in the air and dissolved in water, oxygen is second only to nitrogen in abundance among uncombined elements in the atmosphere. Plants and animals use oxygen to respire and return it to the air and water as carbon dioxide (CO2).
Explanation:
What is the volume, in liters, of 0.350 mol of nitrogen gas at 32°C and
0.980 atm of pressure? *
A. 9.85 L
B. 8.94 L
C. 104.6 L
D. 0.94 L
Answer: The volume is 8.94 L.
Explanation:
Given: no. of moles = 0.350 mol, Pressure = 0.980 atm
Temperature = [tex]32^{o}C = (32 + 273) K = 305 K[/tex]
Formula used to calculate the volume is as follows.
PV = nRT
where,
P = pressure
V = volume
n = number of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\0.980 atm \times V = 0.350 mol \times 0.0821 L atm/mol K \times 305 K\\V = 8.94 L[/tex]
Thus, we can conclude that the volume is 8.94 L.
Rubbing alcohol and vegetable oil soluble on insoluble?
Unlike gases, the behavior of liquids and solids cannot be described by a set of laws that can be applied regardless of the identity of the substance
a. True
b. False
Answer:
a. True
Explanation:
The gases that we study are governed by different laws of physics. Gases behaves according to some given set of laws like the Universal gas laws, Boyles law, Charles law, Gay Lussac's law and many more.
But we do not see a definite pattern or rule when we study solids or liquids. The behavior of the solids and liquids are not described by the set of laws which are applied regardless of the identity of the substance.
You have a cold gas of atoms, and you observe that if you shine light consisting of photons with energy 10 eV through the gas, some free electrons are observed, implying that a photon of this energy is able to ionize an atom in the gas. (a) If you find that the emitted electrons from the gas have a kinetic energy of 1 eV, what is the ionization energy of the cold atom
Answer:
Ionization Energy = 9 eV
Explanation:
If we apply the law of conservation of energy to the given situation, we will get the following equation:
[tex]Energy\ of\ Photon = Ionization\ Energy + Kinetic\ Energy\ of\ Electron\\[/tex]
where,
Energy of Photon = 10 eV
Ionization Energy = ?
Kinetic Energy of Electrons = 1 eV
Therefore,
[tex]10\ eV = Ionization\ Energy + 1\ eV\\Ionization\ Energy = 10\ eV - 1\ eV[/tex]
Ionization Energy = 9 eV
18. Reza has a glass ball filled with water that contains tiny plants and shrimp that eat those plants.
No material can get in or out, but light can get through the glass when it is placed in sunlight
The number of energy storage molecules in the plants and shrimp started out high, but then the
glass ball was moved, and the number of energy storage molecules decreased. Was the glass ball
moved into the light or into the dark? What happened to the amount of carbon in the water?
Answer:
The glass ball was moved into the dark, and there is more carbon in the water.
Explanation:
Reza has a glass ball filled with water that contains tiny plants and shrimp that eat those plants. No material can get in or out, but light can get through the glass when it is placed in sunlight.
The number of energy storage molecules in the plants and shrimp started out high, but then the glass ball was moved, and the number of energy storage molecules decreased. Was the glass ball moved into the light or into the dark? What happened to the amount of carbon in the water?
The glass ball was moved into the dark and the amount of carbon increased in water as there is no photosynthesis taking place.
What is photosynthesis?It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy through the process of cellular respiration.
Some of the energy which is converted is stored in molecules of carbohydrates like sugar and starches which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.
The process begins with proteins absorbing light energy which are called reaction centers and contain a green pigment which is called chlorophyll . In plants ,these pigments are present inside organelles called chloroplasts while in bacteria they are present in plasma membrane.
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