Unit 1: Chemistry Review

Which is a physical property of matter?

• Toxicity

• pH

• Boiling point

• Flammability

Which is a chemical change?

• Melting wax

• Dissolving powder

• Rusting

• Dicing an onion

Which of the following is true about baking?

• It is a physical change

• It is a chemical change

• It is a mixture

• It is a radioactive change

Below are properties listed for element X. What is TRUE about these properties?

• None of the statements below are true

• They are all chemical properties.

• They are all physical properties.

• They are both physical and chemical properties

Jose and Josh poured two liquid substances A and B together. They then observed the formation of a precipitate. Which statement below is true?

• It made a radioactive substance.

• It is a physical change.

• The substances did not change physically or chemically; they separated.

• It is a chemical change.

Mrs. Price has a 100 gram cube of silver (Ag). If she cut it in half, then which statement below would be true?

• It is a physical change because she changed its density.

• It is a physical change because she changed its shape and volume.

• It is a chemical change because it would dissolve in acid faster.

• It is a chemical change because it would be more malleable.

The students must form a claim about their substances. Which claim would be most accurate?

• A new substance has formed in both scenarios; we know this because we observed bubbles and color change.

• A new substance has formed in scenario 1; we know this because we observed color change.

• A new substance has formed in scenario 2; we know this because we observed bubbles.

• Neither scenarios formed a new substance; we know this because we observed bubbles and color change.

Which statement is true about the properties X and Y?

• When observing properties Y the substance will be changed on a molecular level, whereas when observing properties X it will not change the matter.

• When observing properties X & Y the substance will be changed on a molecular level.

• When observing properties X the substance will be changed on a molecular level, whereas when observing properties Y it will not change the matter.

• When observing properties Y & X the substance will not be changed on a molecular level.

A class tracked the temperature and heat being added to H2O over time. Which conclusion is correct?

• Jill is correct

• Paul and Annie are correct.

• Annie is correct.

• Paul & Jill are correct.

Which set of words would correctly fill in the blanks? (PS.8.1.5) “On the right side of the equation are the chemicals made by the reaction which are called ____, and on the left side of the equation are the starting materials which are called the ______.”

• Reactants / Products

• Products / Reactants

• Catalysts / Inhibitors

• Solvents / Solutes