Answer:A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius. Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital.
Answer:
A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius. Down a group, the number of energy levels increases, so there is a greater distance between the nucleus and the outermost orbital.Explanation:
What is 797 mm hg to atm?
Answer:
797 mm hg = 1.04868 atm
Explanation:
1 atm = 760 mm hg
797 mm hg to atm is 1.0468 atm
Pressure is defined as the physical force exerted on an object. The force applied is perpendicular to the surface of objects per unit area.
There are many different types of units and prefixes that may be used in general practice to reflect pressure. Thus, it is ensured that all the measurements and their respective units are in the same framework when conducting pressure calculations.
Pascal is the SI unit of pressure, and is the basic pressure unit in the SI (the International System of Units) system.
Given,
Pressure = 797 atm
1 mm Hg = 0.00131579 atm
797 mm Hg = 0.00131579 × 797
= 1.04868 atm
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What else is produced when sodium carbonate decomposes?
Na2Co3 - Na2O+
Answer:When a single compound breaks down into two or more compounds or elements in a chemical reaction then it is known as decomposition reaction.
The chemical symbol for sodium carbonate is .
The decomposition of sodium carbonate is:
The decomposition of sodium bicarbonate, will result in the formation of sodium oxide, and carbon dioxide, .
Hence, carbon dioxide, will produce with sodium oxide, on decomposition of .
Explanation:Na2CO3 Na2O +CO2 CO2 is the answer
A football player kicks a 0.94 kg football with a force of 2.4 N.
Calculate the acceleration of the football as the player kicks the ball. Round your answer to the nearest tenth of a m/s2.
The acceleration of the football is
Explanation:
Fnet = ma
Therefore a = Fnet/m = 2.4N/0.94kg = 2.45m/s².
Answer:
2.6 m/s2
Explanation:
HELPPP PLEASEEE
is this
1: radiation
2: conduction
3: convection
This is an example of #2, conduction.
Conduction is the process where heat energy is transmitted through collisions between atoms or molecules.
A biochemist carefully measures the molarity of magnesium ion in of cell growth medium to be . Unfortunately, a careless graduate student forgets to cover the container of growth medium and a substantial amount of the solvent evaporates. The volume of the cell growth medium falls to . Calculate the new molarity of magnesium ion in the cell growth medium. Be sure your answer has the correct number of significant digits.
Answer:
760 uM
Explanation:
A biochemist carefully measures the molarity of magnesium ion in 47, mL of cell growth medium to be 97 uM. Unfortunately, a careless graduate student forgets to cover the container of growth medium and a substantial amount of the solvent evaporates. The volume of the cell growth medium falls to 6.0 mL. Calculate the new molarity of magnesium ion in the cell growth medium Be sure your answer has the correct number of significant digits.
The problem here is that the amount of magnesium ion remains the same irrespective of the volume.
Amount of magnesium in the growth medium = molarity x volume
= 97 x [tex]10^{-6}[/tex] x 47 x [tex]10^{-3}[/tex] = 4.559 x [tex]10^{-6}[/tex]
Then, the volume reduced to 6.0 mL, the new molarity becomes;
molarity = mole/volume
= 4.559 x [tex]10^{-6}[/tex]/6 x [tex]10^{-3}[/tex] = 7.598333 x [tex]10^{-4}[/tex] M = 759.83333 uM
To the correct number of significant digits = 760 uM
Please help will give brainliest
Answer:
Number of moles = 1.57 mol
Explanation:
Given data:
Mass of propanol = 94.1 g
Molar mass of propanol = 60.1 g/mol
Number of moles of propanol = ?
Solution:
Formula:
Number of moles = mass/molar mass
by putting values,
Number of moles = 94.1 g/ 60.1 g/mol
Number of moles = 1.57 mol
you have a friend who is using a recipe for flat from american cookbook you notice that he set your over temperature at 175F° what you advise him to do?
Answer:
I will give them advice, that do the power of flame low....
Explanation:
thanks.
punnet squares, help how do I do this
Explanation:
Im not sure what the other trait is so I couldn't do phenotype. I hope this still helps though
Please Help!
Your car has 1.95 gallons of gasoline (octane, d = 0.6916 g/mL), which reacts with oxygen
according to the balanced reaction below. Your car uses the energy produced by this reaction
at a rate of 115 kJ per second while traveling at a speed of 65 miles per hour. Calculate the
distance (in miles) the car can travel using this amount of octane.
2 C8H18(g) + 25 O2(g) -----> 16 CO2(g) + 18 H2O(g) ΔHrxn = -10,900 kJ
Answer:
38.3 miles
Explanation:
First, we convert 1.95 gallons to mililiters:
1.95 gallons * [tex]\frac{3.785 L}{1gallon}*\frac{1000mL}{1 L}[/tex]= 7380.75 mLThen we calculate how many grams of octane are available for the reaction, using its density:
0.6916 g/mL * 7380.75 mL = 5104.53 g C₈H₁₈Now we convert octane grams into octane moles, using its molar mass:
5104.53 g C₈H₁₈ ÷ 114 g/mol = 44.78 mol C₈H₁₈Then we calculate how many kJ are produced from the combustion of 44.78 mol C₈H₁₈, if 2 moles produce 10900 kJ:
44.78 mol * 10900 kJ / 2 mol = 244032 kJWe calculate how many seconds is the car available to keep going, if it spends 115 kJ per second:
244032 kJ * 1 s / 115 kJ = 2122.02 sWe convert seconds to hours:
2122.02 / 3600 = 0.59 hoursFinally we calculate the distance:
65 mi/hour * 0.59 hour = 38.3 mitide occur in ocean but not in lake why
Answer:
Because while our lakes are Great, they're comparatively much smaller than oceans. And the gravitational pull isn't strong.
Which of the following elements in a nonmetal? *
Zinc (Zn)
O Barium (Ba)
Krypton (Kr)
Lithium (Li)
Answer:
Krypton (Kr)
Explanation:
Nonmetals are the elements that have opposing features and characteristics of metals. Nonmetals do not shine and are dull in appearance. They are bad conductors of heat and electricity. They are brittle and cannot be beaten into sheets. The density, melting and boiling points of the nonmetals are low. Krypton (Kr) is a non metal whose atomic number is 36.
someone on this planet please help me with this vocab
Answer:
1 - concentrated solution
2- dilute solution
3- solubility
4- saturated solution
5- supersaturated solution
6- unsaturated solution
7- acid
8- base
9- corrosive
10- indicator
Explanation:
What happens to molecular energy(heat) in water when water vapor becomes a liquid?
Group of answer choices
Water vapor gives up heat energy.
Water vapor absorbs heat energy.
As water's mass increases it absorbs energy.
Water vapor retains the same heat energy.
Answer:
Water vapor retains the same heat energy.
Answer:
water vapor gives up heat energy.
Explanation:
Took a quiz and got it right
just write a C.E.R (claim, evidence, reasoning)
Answer:
I have attached pictures below. Maybe those will help?
Explanation:
Answer:
this is a CER model i did for science
Explanation:
claim : Tissue engineering is good for the future and has a positive impact on the future because tissue engineering restores aged, damaged or lost tissues/organs with artificial tissues in a way past medicines or technology has not.
evidence: The infographic states, “This science field provides opportunities for helping many people replace dead or injured organs with new ones. In doing so, it will give them a healthier, more productive life. This field is just beginning, and it is sure to change the length and quality of life of many people in the future.“
reasoning: Many people can benefit from tissue engineering because they can have dead or injured organs replaced with new ones. Tissue engineering is just the beginning and is still being conducted and tested , but as technology gets more advanced and advanced, tissue engineering will improve peoples lives the way medicines and past technology has never done.
A sample is in the second half-life. What percent of the sample is stable at this point?
A. 12.5%
B. 25%
C. 50%
D. 75%
Answer:
75%
Explanation:
on edg :)
How is the kinetic energy of the particles of a substance affected during a phase change?
A.) Kinetic energy increases during exothermic changes and decreases during endothermic changes.
B.) Kinetic energy decreases during exothermic changes and increases during endothermic changes.
C.) Kinetic energy does not change, but the potential energy does.
D.) Kinetic energy changes in the opposite way that the potential energy changes.
Answer: A. Kinetic energy increases during exothermic changes and decreases during endothermic changes
Explanation: During an exothermic change potential energy is converted to kinetic energy. I hope this is correct. :)
Answer:
C
Explanation:
A limited number of the many known elements comprise the largest portion of living matter. Group Elements A Calcium, Phosphorus, Oxygen, Sulfur B Cobalt, Hydrogen, Oxygen, Nitrogen C с Helium, Oxygen, Sulfur, Carbon Hydrogen, Oxygen, Nitrogen, Carbon 1 1 Which group of elements above comprises the largest portion of living matter? A Group A B Group B C Group C D Group D
Answer:
Explanation:
Hydrogen oxygen nitrogen and carbon
Mass of an empty 50 litres cylinder is 4.8kg. the cylinder is filled with 60atm nitrogen gas. molecular mass of nitrogen is 28. what is the new mass of cylinder
Answer:
8.235 kg
Explanation:
Mass of the cylinder = 4.8 kg
The capacity (volume) of the cylinder = 50 liters
As 1 m^3 = 1000 liters
So, the volume of the cylinder, v= 0.05 m^3
The volume of filled nitrogen, v= 0.05 m^3
Pressure of filled nitrogen, p = 60 atm = 60\times 101325 Pa
Assuming that the nitrogen gas is at room temperature which is 25-degree centigrade,
So, the temperature of nitrogen gas, T=273+25= 298 K
By using the ideal gas equation, pv=nRT
Where n is the number of moles, R is the universal gas constant, R = 8.314 J/mol·K
Putting all the values in the ideal gas equation, we have
(60 x 101325)0.05 = n (8.314) x (298)
n= (60 x 101325 x 0.05)/(8.314 x 298)
n=122.69 moles
As the molar mass of nitrogen is 28, so the total mass of the nitrogen in the cylinder, m= 122.69 x 28 = 3435.32 grams = 3.435 kg.
Hence, the new mass of the cylinder = 4.8+3.435=8.235 kg
The table shows four reactions.
Reactions
Reaction Equation
C₃ H8+ 50₂ 3C02 + 4H20
2Ca + O2- 2CaO
AgNO3 + NaCl
AGCI + NaNO3
CH3COOH + 202 - 2CO2 + 2H20
4
Which of the above reactions is an example of combustion of an Inorganic substance? (5 points)
Answer: 2
Explanation:
A combustion reaction must include O2 as a reactant.
An inorganic substance almost never includes carbon.
So, by process of elimination:
1. Carbon is a reactant = probably not
2. Has O2, no carbon = yes
3. O2 is not a reactant = no
4. Carbon is a reactant = probably not
An example of the combustion of an inorganic substance is:
2 Ca + O₂ ⇒ 2 CaO
We have 4 reactions and we want to determine which is an example of combustion of an inorganic substance.
What is combustion?A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.
What is the difference between organic and inorganic substances?Organic substances always contain carbon while most inorganic substances do not contain carbon.
Let's consider the following reactions.
C₃H₈ + 5 O₂ ⇒ 3 CO₂ + 4 H₂OThis is a combustion reaction but C₃H₈ is an organic substance.
2 Ca + O₂ ⇒ 2 CaO
This is an example of the combustion of an inorganic substance.
AgNO₃ + NaCl ⇒ AgCI + NaNO₃
This is not a combustion reaction.
CH₃COOH + 2 O₂ ⇒ 2 CO₂ + 2 H₂O
This is a combustion reaction but CH₃COOH is an organic substance.
An example of the combustion of an inorganic substance is:
2 Ca + O₂ ⇒ 2 CaO
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the initial internal energy of a system is 43.5kj. it absorbs 8.3kj of heat while performing 3.5kj of work on the surroundings. what is its final internal energy?
Shows works to help me understand what I did wrong.
Answer:
[tex]U_2=48.3kJ[/tex]
Explanation:
Hello!
In this case, since the fist law of thermodynamics helps us to understand how the change in internal energy is defined in terms of the head added to the system and the work done by the system:
[tex]Q+W=\Delta U[/tex]
In such a way, since 8.3 kJ of heat are absorbed by the system, 3.5 kJ are done by the system and the initial internal energy is 43.5 kJ, the final internal energy turns out:
[tex]U_2=U_1+Q-W\\\\U_2=43.5kJ+8.3kJ+3.5kJ\\\\U_2=48.3kJ[/tex]
Best regards!
Which of the following elements has six valence electrons?
Be
B
C
N
O
In science why is it important to explain why the evidence supports your claim?
what is the volume of a book that has a width of 10cm,a length that is 2 times the width,and a height that is half the width
width=10cm
length=2xwidth=2x10=20cm
height=width/2=10/2=5
V=w*l*h=10*20*5=1000cm^3
Answer:
1000cm^3
Explanation:
first collect what is known
width 10cm
length 2×width (2×10cm) =20cm
height width/2 (10cm/2) =5cm
now if we use the formula for finding volume of a cuboid that has length, width and height known;
V = l×w×h
= 20cm × 10cm × 5cm
= 1000cm^3
A piece of iron has a density of 7.87 grams per milliliters. It has a mass of 78.7 grams. What is the volume of the piece of iron?
A chemical equation is balanced when the
subscripts of the reactants equal the subscripts of the products,
coefficients of the reactants equal the coefficients of the products,
products and reactants are the same chemicals,
same number of each kind of atom appears in the reactants and in the products,
same number of each kind of atom appears in the reactants and in the products
How many hydrogen ions (H+) are in a mole?
How many moles are I 24.0x10^18 molecules NaOH?
Answer:
[tex] \huge 3.986 \times { 10}^{ - 5} \: \: mol \\ [/tex]
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{24 \times {10}^{18} }{6.02 \times {10}^{23} } \\ \\ = 3.986 \times { 10}^{ - 5} \: \: mol[/tex]
Hope this helps you
Bruh I hate science Pls help me
List 5 physical properties of matter.
What is a chemical property?
List 2 chemical properties.
What is the difference between chemical property and chemical change?
List 3 products that are the results of chemical reactions.
Answer:
1. The properties of matter include any traits that can be measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more.
2. A chemical property is a characteristic of a particular substance that can be observed in a chemical reaction.
3. Toxicity and acidity.
4. A chemical property describes the ability of a substance to undergo a specific chemical change. A chemical reaction is a process that occurs when one or more substances are changed into one or more new substances.
5. The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories. Some reactions will fit into more than one category.
Hope this helps you~
URGENT!!!
5. As the water temperature is increased
from 20°C to 90°C, how many more grams
of copper sulfate will dissolve in 100 grams
of water?
____g
Answer:
40
Explanation:
Consider the amino acid below, which is called alanine
Which atoms give the amino acid its unique chemical and physical properties?
A.the CH3 group
B. the amino groups
C. the oxygen atom
D. the hydrogen atom
Answer:
A) the CH3 group
Explanation: