Chemistry Review

Which is a physical property of matter?

• Toxicity

• pH

• Boiling point 

• Flammability

Tags

NGSS.MS-PS1-4

Which is a chemical change?

• Melting wax

• Dissolving powder 

• Rusting 

• Dicing an onion

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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.

Which scenario is a physical change?

• Water evaporating

• Nails rusting

• Fireworks exploding

• Combustion of gas in a car's engine

Read the scenarios

• 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.

Tags

NGSS.MS-PS1-2

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.

Tags

NGSS.MS-PS1-1

A class tracked the temperature and heat being added to H2O over time. 

-Jill says that overall she thinks H2O is going through a physical phase change as the temperature increases.

-Paul says that at the melting and boiling points the H2O changes phases, which is a physical change. 

-Annie says that when the phase of matter is held constant it is physical, but when the substance hits melting point and boiling point it is a chemical change.

Which conclusion is correct?

• Jill is correct

• Paul and Annie are correct.

• Annie is correct.

• Paul & Jill are correct.

Tags

NGSS.MS-PS1-4