Unit 3 Week 1 Review

What evidence of chemical reaction is being shown in the picture?

• Formation of a precipitate

• Release of heat

• Formation of bubbles

• Change of color

What evidence of a chemical reaction is being shown in the picture?

• Formation of a precipitate

• Release of heat

• Production of light

• Release of gas

Which of the following statements is true regarding lighting a candle?

• Lighting a candle is a physical change because no new substances are formed

• Lighting a candle is a chemical change because heat and light are released

• Lighting a candle is a physical change because heat and light are produced

• Lighting a candle is a chemical change because new substances are formed

What evidence of chemical change is being shown here?

• Change of color

• Formation of a precipitate

• Release of gas

• Release of heat

Nylon is synthesized by mixing 2 liquids, what is the evidence that making nylon is a chemical change?

• Formation of a precipitate

• Release of gas

• Production of light

• Change in color

Which of the following evidences is NOT present when dropping a gummy bear on molten KClO₃?

• Release of gas

• Production of light

• Release of heat

• Formation of a precipitate

This picture shows the different stages of a reaction, choose the two main evidences of a chemical change

• Formation of a precipitate

• Change of color

• Release of gas

• Production of light

Which of the following is NOT a chemical change?

• Digestion

• Rust

• Fermentation

• Distillation

Which of the following is NOT an example of change of color as evidence of a chemical change?

• Water changes color as food coloring is added to it

• Fruit changes color as it rottens

• A goalkeep changes color as it rusts

• Leaves change color in autumn

Which of the following is NOT an evidence of a chemical change?

• Change in temperature

• Expected change of color

• Formation of a precipitate

• Formation of bubbles