Chemistry diagnostic

Jose was given a list of statements pertaining to behaviour in the science lab. His teacher told him to follow all except one. Which one is not a safe practice?

• Tie back loose hair and roll up long sleeves.

• Wear safety goggles when working with chemicals.

• Always look at containers from above.

• Do not taste anything in the lab.

Matter is defined as anything that has mass and occupies _____.

• weight

• area

• space

• state

An ice cube placed on a lab station counter becomes a pool of water. What term best describes this change in state?

• melting

• freezing

• sublimation

• condensation

Tags

NGSS.MS-PS1-4

An unknown metallic object has a mass of 54 g and occupies a volume of 18 cm³. What property can be determined from these measurements?

• density

• solubility

• hardness

• conductivity

Which answer best describes two or more elements chemically combined in specific proportions?

• an atom

• a compound

• a mechanical mixture

• a solution

Tags

NGSS.MS-PS1-5

Aluminum foil is rolled into sheets for easy handling. Which physical property of aluminum makes this possible?

• It is malleable.

• It is hard.

• It is ductile.

• It is conductive.

Which best illustrates a heterogeneous substance?

• salt solution

• container of soil

• gold coin

• water

The chart represents the steps in classifying matter.

• pure substance

• compound

• solution

• mechanical mixture

Heating a teaspoon of sugar over a candle flame produces a chemical change. In addition to changing colour, what else does the reaction produce?

• a strong smell

• heat and light

• bubbling and fizzing

• a solid compound

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Julian was trying to explain to his friend, Susan, that only one of the following is an example of a chemical change. Which one?

• a glass window shattering to pieces

• iodine dissolving in alcohol

• a steak frying in a pan on a stove burner

• a light bulb filament glowing

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5