foundations of chemistry

Which of the following is NOT an example of a physical change?

• the shaping of a gold bar
• the melting of a popsicle
• the explosion of fireworks
• the sanding of a piece of wood

What kinds of changes in substances are always physical changes?

• changes of state from solid to liquid to gas and back

• changes that result in new substances being formed

• changes that change the identity of the substance

• changes that change the density of the llamas

Which of the following is NOT the result of a chemical change?

• soured milk
• rusted metal
• ground flour
• digested food

Which of the following is a chemical property of matter?

• solubility
• volume
• density
• reactivity

How does a physical change differ from a chemical change?

• in a physical change new volumes are created
• in a physical change new materials are produced
• in a physical change the composition is unchanged
• in a physical change the change is reversible

Which of the following events is NOT a common sign that a chemical change has taken place?

• change in color or odor
• change in state
• foaming or bubbling 
• production of heat or light

What chemical property is responsible for iron rusting?

• flammability 
• conductivity
• nonflammability
• reactivity to oxygen

What has mass and takes up space?

• weight
• volume
• space
• matter

The reverse of condensation is 

• boiling
• evaporation
• freezing
• sublimation

If a spoonful of salt is mixed in a glass of water, what is the water called?

• solute
• solution
• solvent
• element