Unit 1 Test

Which procedure would best allow a scientist to observe a chemical property of hydrochloric acid (HCl) solution?

• cooling the HCl solution until it becomes solid, and measuring this temperature

• adding zinc to the HCl solution and observing whether or not bubbles are produced

• placing a conductivity probe into a beaker of HCl solution to determine if it conducts electricity

• measuring the mass of and volume of a sample of HCl solution to find its density

Tags

NGSS.MS-PS1-2

Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?

• If the substance is a liquid or solid, an increase in temperature would indicate a chemical change.

• If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change.

• If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change.

• If the substance is a liquid or solid, production of an odor would indicate a chemical change.

Tags

NGSS.MS-PS1-2

Based on the above description of transpiration and photosynthesis, which type of change happens to water during each process?

• In transpiration, because some of its properties change, water undergoes a physical change but keeps its identity. In photosynthesis, because its identity changes, water undergoes a chemical change.

• In transpiration, because some of its properties change, water undergoes a chemical change but keeps its identity. In photosynthesis, because its identity changes, water undergoes a physical change.

• In transpiration, because its physical properties change, water undergoes a physical change and loses its identity. In photosynthesis, because it keeps its identity, water undergoes a chemical change.

• In transpiration, because its chemical properties change, water undergoes a chemical change and loses its identity. In photosynthesis, because it keeps its identity, water undergoes a physical change.

Tags

NGSS.MS-LS2-3

Tijuan mixed a solid and a liquid together in a beaker. He determined that a chemical change occurred. If his conclusion is correct, which substances could he have been observing and why?

• ice mixed into warm oil, because the change of state that occurred when the ice melted cannot be reversed

• baking soda mixed into vinegar, because the production of bubbles indicates that a new substance formed

• sugar mixed into hot water, because the disappearance of solid indicates that the chemical identity of the sugar changed

• sand mixed into water, because when sand was added the mass of the beaker increased

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If two items are equal in size, the denser one will

• be lighter.

• be heavier.

• have more volume.

• have less volume.

What is the density of a 700 kg object with a volume of 649 m³? (Density: D = m/v.)

• 0.927 kg/m³

• 0.4543 kg/m³

• 1.079 kg/m³

• 4.543 kg/m³

The density of an object is 0.835 g/cm³. If its volume is 34 cm³, what is the mass of the object? (D = m/v)

• 0.02 g

• 0.41 g

• 28.39 g

• 40.72 g

A column is filled with four different liquids of different densities. A red liquid, a blue liquid, a green liquid, and a purple liquid are all added into the column. This chart shows the densities of the liquids. In what order would the liquids arrange themselves, from top to bottom?

• blue, red, purple, green

• purple, green, red, blue

• purple, green, blue, red

• blue, red, green, purple

Tags

NGSS.MS-PS1-2

Which describes a feature of the physical changes of all substances?

• can dissolve in water

• can conduct heat and electricity

• rearranges atoms to form new substances

• does not change the identity of a substance

Which would show an example of how physical changes are reversible?

• cutting a gold bar in two pieces and then putting the pieces next to each other

• burning a match and then relighting it

• melting tin and then cooling it into a mold

• combining sodium and chlorine to make the new material of table salt