Chemical Reactions Review

In a heterogeneous mixture, the substances

• break down into new substances

• can be physically separated

• are chemically combined

• can only be separated through chemical processes

In the chemical equation shown, what type of chemical reaction is this?

• synthesis

• decomposition

• replacement

• polymers

Tags

NGSS.MS-PS1-2

Which of the following statements are true?

• a solution is a mixture

• the solvent is dissolved in the solute

• a solution is a pure substance

• a solution has the same properties as a colloid

Luisa likes to drink water from a plastic bottle. She knows the bottles were formed from synthetic polymers that were created in a chemical reaction. She also knows that synthetic materials can cause problems. Which statement explains the kind of problem that can develop from using synthetic materials such as plastic?

• Plastics have changed the way people use materials.

• Plastics have contributed to more pollution.

• Plastics have made the lives of people easier.

• Plastics have made more work for people.

Tags

NGSS.MS-PS1-3

Milk and sugar water are both ____________. However, milk is a ____________ and sugar water is a ____________.

• pure substances, colloid, solution

• mixtures, colloid, colloid

• pure substances, solution, colloid

• mixtures, colloid, solution

This equation is _____________ and it represents a  _____________   chemical reaction.

• unbalanced, replacement

• balanced, unbalanced

• balanced, replacement

• unbalanced, synthesis

Tags

NGSS.MS-PS1-5

What factors affect the properties of a solution?

• density and melting point

• solvent and solute

• temperature and pressure

• open system and closed system

After learning about the law of conservation of mass, Remy began to wonder about how to best test this law. She wanted to show that the amounts of matter did not change but produced an equal amount of a different kind of matter. What is the best way to study this law?

• in a homogeneous mixture

• in an open system

• in a heterogeneous mixture

• in a closed system

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is an example of a chemical change?

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Alex saw a rusty old car in an abandoned lot. Because he had recently read about chemical reactions, he began to wonder how the rust formed. What happened to cause the rust on the steel car?

• Oxygen in the air chemically combined with the iron in the steel to form rust.

• A physical change took place in the steel of the car to form rust.

• Oxygen in the air reacted with the paint on the car and formed rust.

• A decomposition chemical reaction took place when the iron in the steel mixed with oxygen to form rust.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5