Classification of Matter

How prepared do you feel for this assessment?

• Very prepared

• Prepared

• Partially prepared

• Not prepared

The smallest particle of an element is a(n)

• Compound

• Molecule

• Crystal

• Atom

Lead (Pb), silver (Ag), and iron (Fe) are examples of

• Pure substances

• Compounds

• Homogeneous Mixtures

• Heterogeneous Mixtures

Substances can be classified as elements, compounds or mixtures. Which of these is the formula for a molecule of an element?

• H

• H₂

• H₂O

• H₂O₂

Which of these is a mixture?

• sodium (Na)

• chlorine (Cl₂)

• sodium chloride (NaCl)

• sodium chloride aqueous solution

A small amount of liquid bromine is placed in a gas jar containing air. The jar is then sealed. After two minutes, a brown gas is seen just above the surface of the liquid. After two hours, the whole gas jar is full of the brown gas. (See image).

Which of these is the process that causes the brown gas to fill the gas jar?

• condensation

• diffusion

• evaporation

• sublimation

Salt water is a homogeneous mixture. Which of the following statements best explains why?

• The components are chemically bound together, so it looks the same throughout

• The particles are large enough to see, so it looks the same throughout

• It is uniformly mixed, so it has an even composition throughout

• it is unevenly mixed, so it does not have the same composition throughout

Which key term describes the random movement of particles?

• Diffusion

• Brownian Motion

• Osmosis

• Solubility

A ________ is a solution in which no more solute can dissolve.

• homogeneous

• unsaturated

• saturated

• supersaturated

The substance in which a solute is dissolved is a?

• solution

• solvent

• solute

• mixture