Chemical Reaction Word Problems

You have 2 chemicals, CHEMICAL A and CHEMICAL B. They are both liquids. When you combine them you notice some crystals starting to form within them. Did a chemical reaction occur?

• Yes

• No

Tags

NGSS.MS-PS1-2

This is the decomposition reaction of hydrogen peroxide. According to the law of conservation of mass, if you start with 40g of hydrogen peroxide you should end up with _____g of water and oxygen combined.

• 10

• 20

• 30

• 40

Tags

NGSS.MS-PS1-5

You have a solution of sodium chloride (NaCl) and you add silver nitrate (AgNO3) to it. A white precipitate forms. What is the precipitate?

• Silver chloride (AgCl)

• Sodium nitrate (NaNO3)

• Sodium chloride (NaCl)

• Silver nitrate (AgNO3)

Tags

NGSS.MS-PS1-2

When vinegar (acetic acid) is mixed with baking soda (sodium bicarbonate), bubbles form. What gas is produced?

• Oxygen (O2)

• Carbon dioxide (CO2)

• Hydrogen (H2)

• Nitrogen (N2)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction, the mass of the reactants is 50 grams. After the reaction, the mass of the products is measured to be 50 grams. What principle does this demonstrate?

• Law of Conservation of Mass

• Law of Definite Proportions

• Law of Multiple Proportions

• Law of Conservation of Energy

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A piece of zinc is added to hydrochloric acid, and hydrogen gas is released. What type of reaction is this?

• Synthesis

• Decomposition

• Single replacement

• Double replacement

What is the product when hydrogen gas reacts with oxygen gas?

• Water (H2O)

• Hydrogen peroxide (H2O2)

• Ozone (O3)

• Carbon dioxide (CO2)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-PS1-1

If you mix an acid with a base, what is the typical result?

• A salt and water

• A gas and a salt

• A precipitate and water

• A gas and water

In the reaction between magnesium and oxygen to form magnesium oxide, what is the balanced chemical equation?

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the role of a catalyst in a chemical reaction?

• It increases the rate of reaction without being consumed

• It decreases the rate of reaction and is consumed

• It is consumed in the reaction to form products

• It changes the products of the reaction

Tags

NGSS.HS-PS1-5