chem midterm #s 1-50

Which of the following processes does not represent a physical change?

• filtration of a solid from a liquid

• freezing of a liquid

• evaporation of water

• distillation of a liquid

• explosion of dynamite

Which of the following is not a pure substance?

• Water

• Oxygen

• Air

• Chlorine

Which of the following is an example of a heterogeneous mixture?

• sand in water

• homogenized milk

• salt dissolved in water

• air

Which one of the following is a physical process?

• the rusting of iron

• the condensation of water vapor

• the baking of a potato

• the formation of polyethylene from ethylene

• the explosion of nitroglycerin

The symbol for the element sodium is ______.

• S

• W

• So

• Na

Passing an electric current through a certain substance produces oxygen and sulfur. This substance cannot be a(n)

• compound

• mixture

• element

• pure substance

Tags

NGSS.HS-PS1-1

Pick the chemical change that occurs when a match is held over a piece of metal.

• the match burns

• metal gets hot

• water condenses on the metal

• smoke deflects light

Tags

NGSS.HS-PS3-4

Which of the following is not matter?

• elemental phosphorus

• dimethyl sulfoxide

• Light

• Dust

Which of the following is a homogeneous mixture?

• gasoline

• muddy water

• iron filings in sand

• fog

Which is not a state of matter?

• Gas

• Solid

• Liquid

• Vacuum