Matter & Chemical Change Section 1-2 Review

The two types of pure substances are...

• Mechanical mixture, element

• Element, compound

• Solution, element

• Colloid, suspension

The group # that represents the most reactive of the gases is...

• 1

• 2

• 17

• 18

The atomic number of an element refers to the...

• Number of neutrons in one atom

• Number of protons and electrons in an atom

• Number of protons and neutrons in an atom

• Number of valence electrons in an atom

The number of protons and electrons in an atom is represented by the:

• Atomic mass

• Mass number

• Element symbol

• Atomic number

Pure substances are ____________ and ______________.

To figure out the number of neutrons in an atom,you can go:

• atomic number - mass number= # of neutrons

• mass number -atomic number= # of neutrons

• mass number + atomic number= number of neutrons

• Atomic mass + mass number= # of neutrons

Making a muffin from dry ingredients is an example of a:

• Physical Change

• Chemical Change

Which of the following represent only physical changes?

• Shredding paper, making a pancake

• Boiling water, rusting

• An apple turning brown, melting an icecube

• Shredding paper, Melting an icecube

This scientist discovered there was a nucleus in atoms through his tinfoil experiment.

• John Dalton

• Ernest Rutherford

• JJ Thomson

• Niels Bohr

The most unreactive gases on the periodic table are found in:

• Group 18

• Group 17

• Group 1

• Group 2