_Evidence of Chemical Changes -

Match

Match the following evidence with the observation

• Butter on bread is a

• Over cooked toast is a

• Coiled copper is a

• Chewing is a

• Digestion is a

Physical Change - because it is melting.

Chemical Change - because it is burned.

Physical Change - because it is bent.

Physical Change - because size changes.

Chemical change - because acids/bases.

• Physical Change - because it is melting.

• Chemical Change - because it is burned.

• Physical Change - because it is bent.

• Physical Change - because size changes.

• Chemical change - because acids/bases.

Multiple Choice

Which of the following best describes a chemical change?

• A change that results in the formation of new substances

• A change that only affects the appearance of a substance

• A change that can always be reversed

• A change that does not involve new properties

Open Ended

Why is it important to understand the evidence of chemical changes in everyday life?

Multiple Choice

Which of the following is NOT an example of a chemical property?

• Flammability

• Ability to Rust

• Melting Point

• Toxicity

Multiple Select

Which of the following are examples of chemical changes?

• A piece of firewood burning

• Baking soda reacting with vinegar

• Water freezing into ice

• A piece of food becoming moldy

Fill in the Blanks

Production of

is one of the evidences of a chemical change.

Multiple Choice

What is the main difference between the production of gas in a chemical change and the bubbles formed during boiling water?

• Gas production in chemical change forms a new substance, while boiling water does not.

• Boiling water produces a new substance, while chemical change does not.

• Both processes produce new substances.

• Neither process involves a new substance.

Open Ended

Explain the difference between endothermic and exothermic reactions in terms of energy and temperature change.

Fill in the Blanks

A

substance formed from a liquid solution is called a precipitate.

Open Ended

Explain the difference between an expected and an unexpected color change when mixing substances.

Multiple Choice

Which of the following is an example of an unexpected color change indicating a chemical reaction?

• Mixing two clear liquids and the solution turns pink

• Mixing red food coloring into water and the solution turns red

• Mixing blue food coloring into water and the solution turns blue

• Mixing oil and water and the solution stays clear

Open Ended

Identify a chemical change you observe on a daily basis.

Open Ended

Identify the 4 types of evidence of a chemical change.

Open Ended

Is dissolving salt in water an example of a chemical change? Explain.

Multiple Choice

What is a key characteristic of a chemical change?

• It results in the formation of new substances

• It always involves a change in temperature

• It can always be reversed

• It only changes the physical state

Open Ended

Identify the evidence of a chemical change for the following: Exploding Fireworks and Burning Sugar.