All about matter

žWhich of the following is true about compounds?

• They can be physically separated into

  their component elements.

• They have compositions that vary.

• They are pure substances.

• They have properties similar to those of

  their component elements.

Tags

NGSS.MS-PS1-5

žWhat makes a mixture different from a compound?

• A compound consists of more than one

  phase.

• A compound can only be separated into its components by chemical means.

• A mixture can only be separated into its

  components by chemical means.

• A mixture must be uniform in

  composition.

žWhich of the following is a heterogeneous mixture?

• vinegar in water

• milk

• oil and vinegar

• Air

žWhich of the following is true about homogeneous mixtures?

• They are known as solutions.

• They consist of two or more phases.

• They have compositions that never vary.

• They are always liquids.

žWhich of the following is a physical change?

• corrosion

• explosion

• Evaporation

• rotting of food

žWhich of the following is NOT a physical property of water?

• It has a boiling point of 100 C

• It is a colorless liquid.

• It is composed of hydrogen and oxygen.

• Sugar dissolves in it.

žWhich of the following is not considered physical properties of a substance?

• color and odor

• melting and boiling points

• malleability and hardness

• Rusting of metal

žAn example of a homogeneous mixture is ____.

• water

• chocolate ice cream

• noodle soup

• Oxygen

žwhat distinguishes a pure substance from a mixture?

• Substance are compounds and mixtures are not.

• Mixtures are grouping of elements and compounds are not.

• Mixtures can be separated physically while compounds cannot.

• Samples of the same substance can have different intensive properties.

žWhich of the following is NOT a physical change?

• grating cheese

• melting cheese

• fermenting of cheese

• mixing two cheeses in a bowl