Which statement best explains the role of acatalyst in a chemical reaction?
(1) A catalyst is added as an additional reactant
and is consumed but not regenerated.
(2) A catalyst limits the amount of reactants used.
(3) A catalyst changes the kinds of products produced.
(4) A catalyst provides an alternate reaction pathway
that requires less activation energy.

Answers

Answer 1

Answer: The answer is (4). If you look at a Maxwell-Boltzmann energy curve, you will see that lowering the activation energy will increase the proportion of molecules with sufficient energy for a successful reaction collision. Therefore, a reaction with lower activation energy will proceed more quickly. Often, this lower activation energy is obtained by another mechanistic pathway. Catalysts increase reaction speed through these two basic mechanisms.

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An atom in the ground state contains 8 valence electrons this atom is classified as a

Answers

Noble Gas. Metals have 1 or 2 Valence Electrons. Halogens have 7 Valence Electrons. Semi-Metals can have different amounts.

Answer:

Noble gas

Explanation:

With the exception of helium, all elements in Group 18 contain 8 electrons in the outermost shell; these are the noble gases.

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What is the total mass of solute in 1000. grams of a solution having a concentration of 5 parts per million?(1) 0.005 g (3) 0.5 g
(2) 0.05 g (4) 5 g

Answers

Answer: The correct answer is (1).

Explanation:

Concentration of the solute in 1000 g of solution: 5 parts per million

1 part per million = 1 milligram/Liter

Then , 5 parts per million = 5 mg/liter

This means that 5 milligrams of solute is present in 1 liter solution.

1 gram = 1000 milligrams

Then 5 milligram = $5* (1)/(1000) g$ = 0.005 grams

Hence, 0.005 grams is the total mass of solute in 1000 grams of a solution having a concentration of 5 parts per million.

What are parts per million?

Parts per million (ppm) is how many parts a certain molecule or compound makes up within the one million parts of the whole solution.

Concentration of the solute in 1000 g of solution: 5 parts per million

1 part per million = 1 milligram/Liter

Then , 5 parts per million = 5 mg/liter

This means that 5 milligrams of solute is present in 1 liter solution.

1 gram = 1000 milligrams

Then 5 milligram = 5 X $(1)/(1000g)$ = 0.005 grams.

Hence, 0.005 grams is the total mass of solute in 1000 grams of a solution having a concentration of 5 parts per million.

Learn more about the parts per million here:

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Which statement defines the heat capacity of a sample?

Answers

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

The answer is "the quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure"

Answer:

Explanation:

I just took the test twice and it wasn't D the first time

Choose all answers that applyPLZ HELP ASAP i am doing a test and i need help. I WILL BE DOING BRAINLIEST TO THE FIRST PERSON WHO REPLYS
When dynamite explodes, it releases a large amount of light and heat. This is an example of _____.

slow combustion
rapid combustion
an exothermic reaction
an endothermic reaction
a chemical change
a physical change

Answers

Answer

Rapid Combustion

Explanation:

An explosion is a combustion and a quick reaction, That makes it rapid

Consider the balanced chemical equation for the combustion of methane (CH4).mc026-1.jpg

Given that the molar mass of CO2 is 44.01 g/mol, how many liters of oxygen is required at STP to produce 88.0 g of CO2 from this reaction?
44.8 L
45.00 L
89.55 L
89.6 L

Answers

Answer:

89.6 L of O₂

Solution:

The balanced chemical equation is as,

CH₄ + 2 O₂ → CO₂ + 2 H₂O

As at STP, one mole of any gas (Ideal gas) occupies exactly 22.4 L of Volume. Therefore, According to equation,

44 g ( 1 mol) CO₂ is produced by = 44.8 L (2 mol) of O₂

So,

88 g CO₂ will be produced by = X L of O₂

Solving for X,

X = (88 g × 44.8 L) ÷ 44 g

X = 89.6 L of O₂

Took a guess and got it right!

D) 89.6 L

How does assigning oxidation states in compounds help you balance redox reactions?a. The oxidation state tells you how the bonding electrons are arrayed in an atom or molecule. b. The oxidation state tells you about an atom or molecule’s potential to accept or donate electrons. c.The oxidation state tells you the exact charge in each atom. d. The oxidation state is the equivalent of the formal charge. I'm a little stuck on chemistry homework.

Answers

The best answer is B.....
In my words though, the oxidation state helps with you knowing how many electrons are lost or gain by the reactant to produce its product and by knowing this you can then balance the electron transfer and ultimately the equations.

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