Unit 1 Matter & Chemistry Review

Classify each image as an Element, Compound, Homogeneous Mixture, or Heterogeneous Mixture.

a

b

c

d

Homogeneous Mixture

Element

Heterogeneous mixture

compound

Tags

S8P1

Ava is conducting a science experiment. Select the TWO substances that represent a compound.

• H₂SO₄ (sulfuric acid)

• NO₂ (nitrous oxide)

• O₃ (ozone)

• He (helium)

Tags

NGSS.MS-PS1-1

Aiden and Luna are mixing different substances in a science experiment. Which statement is true about the mixtures they are creating?

• Heterogeneous mixtures contain particles that can be easily distinguished (non-uniform), while materials in homogeneous are uniform throughout.

• Homogeneous mixtures do not look the same throughout, but heterogeneous mixtures do.

• The different materials in a heterogeneous mixture cannot be easily distinguished, but they can be easily distinguished in a homogeneous mixture.

• Pond water is an example of a homogeneous mixture and perfume is an example of a heterogeneous mixture.

Mia and Aiden are mixing ingredients for a science experiment. How do mixtures and compounds differ?

• Mixtures are made up of element; compounds are not.

• Compounds are made up of elements; mixtures are not.

• Componds are chemically bonded; mixtures are not.

• Mixtures are chemically bonded; compounds are not.

James is observing a cold drink on a warm day. During which change of state are the atoms or molecules coming closer together?

• condensation

• boiling

• melting

• sublimation

Tags

NGSS.MS-PS1-4

Emma is observing different phase changes in her science class. Which of these phase changes involves a decrease in molecular motion (particles slow down)?

• liquid to gas

• liquid to solid

• solid to gas

• solid to liquid

Tags

NGSS.MS-PS1-4

Abigail was cooking pasta and noticed steam rising from the boiling water. What is happening to the particles in the steam?

• The particles in the steam are far apart and moving very fast.

• The particles in the steam are closely packed and vibrate in place.

• The particles in the steam are close together but are moving past each other.

• The particles in the steam are under so much stress that they are broken apart.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Emma is observing a pot of water on the stove. In which phase would the water molecules move the fastest and why?

• Steam to water because of the decrease in temperature.

• Ice to water because of the increase in temperature.

• Water to steam, because of the increase in temperature.

• Water to ice because of the decrease in temperature.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Aiden and Jackson are given two jars, each of which contains an unknown substance. They are asked to determine if the substances are different from one another or if each jar contains the same substance. What should they do to complete this task?

• Compare the appearances of the substances. If the substances look the same, then they are the same.

• Compare the physical states of the substances. If the substances are in the same state, then they are the same.

• Compare only the physical properties of the substances. If the substances have the same density or melting point, they are the same substance.

• Compare both the physical and chemical properties of the substances. If the substances perform the same in a variety of tests, then they are the same.

Charlotte and Lily are in a science class discussing different gases. Which physical property of matter can be used to classify the gases oxygen, helium, and hydrogen as being similar?

• reactivity

• malleability

• state of matter

• flammability

Tags

NGSS.MS-PS1-4