Match these items with their examples:

1. liquid solution
2. solid solution
3. compound
4. gaseous solution
5. element

sterling silver
air
salt water
sugar
gold

State one important difference between a physical change and a chemical change?

Which statement would indicate the presence of an acid

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost