CHEMISTRY HIGH SCHOOL

Which reactant is common to many burning reactions?

Answers

Answer 1
Answer:

Answer:

Combustion reactions must have oxygen as a reactant. Note that the water that is produced is in the gas rather than the liquid state because of the high temperatures that accompany a combustion reaction.

Explanation:

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What information do the coefficients of a balanced equation give about the reactants

Answers

The information that the coefficients of a balanced equation give about the reactants are to tell how many moles of reactants are needed and how many moles of product can be produced.

Which of the following uses a nonrenewable energy resource to generate energy? A. nuclear power plant B. wind farm C. fireplace that burns wood D. biomass power plant

Answers

The answer is bimass power plant.

2. 7.5 g of potassium react with water to produce potassium hydroxide and hydrogen gas. Calculate the mass of potassium hydroxide produced. (8 points)

Answers

Answer:

10.7 g of KOH

Explanation:

First of all, we determine the reaction:

2K (s) + 2H₂O(l) → H₂(g) + 2KOH(aq)

We convert the mass of K, to moles → 7.5 g . mol/39.1 g = 0.192 moles

Ratio is 2:2, so the moles I have of K must produce the same moles of KOH. In this case, the produces moles of KOH are 0.192 moles.

We convert the moles to mass, to finish the answer:

0.192 mol . 56.1g /1mol = 10.7 g of KOH

What allows a gas to fill a container? A. the shape of the particles in a gas
B. the size of the particles in a gas
C. the constant motion of the particles in a gas

Answers

Answer: Option (A) is the correct answer.

Explanation:

It is known that particles of a gas are held by weak Vander waal forces, therefore, there is no force of attraction between gas molecules.

As a result, these particles are in random motion.

Thus, we can conclude that out of the given options, the constant motion of the particles in a gas allows a gas to fill a container.

What is the ph of a solution with [H+]=3.3x10

Answers

pH=-log[H⁺]

That means that the pH=-log(3.3×10)=-1.52

I hope this helps.  Let me know if anything is unclear.

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Answers

It’s the atomic number.
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