Unit 4- Changes in Matter 8th Grade Review-2024

Front

What is the effect of temperature on chemical reactions?

Back

Temperature can influence the rate of chemical reactions; higher temperatures generally increase reaction rates, while lower temperatures can slow them down.

Front

What is a chemical change?

Back

A chemical change occurs when substances combine or break apart to form new substances with different properties.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout; it cannot be separated into other substances by physical means.

Front

What happens to glow sticks in cold temperatures?

Back

Glow sticks will produce dimmer light and may not last as long in cold temperatures due to slower chemical reactions.

Front

What is the difference between mixtures and pure substances?

Back

Mixtures can be physically separated into their components, while pure substances cannot be separated by physical means.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is corrosion?

Back

Corrosion is the gradual destruction of materials, usually metals, by chemical reactions with their environment, often accelerated by heat.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together.

Front

What is the freezing point?

Back

The freezing point is the temperature at which a liquid turns into a solid.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.