Science 7 Final

Substances that CANNOT be broken down chemically into other substances are (pure physical and chemical down to the atom)

• elements
• compounds
• mixtures
• solutions

The measurement of the force of gravity on an object (varies depending on the planet’s mass) is the object’s

• mass
• volume
• weight
• density

The measurement of how much mass is contained in a given volume is called (?=M/V)

• weight
• melting point
• boiling point 
• density

All elements are composed of extremely small particles called

• compounds
• mixtures
• atoms
• molecules

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

• gas burning on a stove
• 
  iron combining with oxygen to form rust
• 
  salt dissolving in a glass of water
• 
  using electricity to break down water into hydrogen and oxygen

How do liquid water, ice, and water vapor differ from each other?

• They are different states of matter.
• They are different compounds.
• They are made of different kinds of molecules.
• 
  They are made of different kinds of atoms.

If you describe methane as a gas that easily catches fire, you are describing a

• 
  state of matter.
• 
  physical property.
• 
  chemical property.
• 
  chemical formula.

Because atoms are so small,

• 
  scientists create models to describe them.
• 
  they cannot be made of smaller particles.
• 
  there is no way to describe them.
• they cannot be synthesized by scientists.
  

In an atom, the number of protons equals the number of 

• 
  nuclei.
• 
  electrons.
• neutrons.
• 
  isotopes.

The elements in a column (vertical group or family) of the periodic table

• 
  have similar properties.
• 
  are in the same period.
• 
  have the same atomic mass.
• 
  have very similar chemical symbols.