CHEMISTRY Semester 1 FINAL

What do we call a pure substance made up of only one type of atom?

• Element

• Compound

• Molecule

• Mixture

Which of the following could be classified as molecules?

• $H_2O$

• $H_2$

• NaCl

• Salt Water

• Na

Which of the following is homogeneous?

• Chocolate Chip Cookies

• Muddy Water

• Chicken Noodle Soup

• Gatorade

Which phase of matter has a fixed volume but an unfixed shape?

• Solid

• Liquid

• Gas

• Plasma

Which of the following could be classified as a compound?

• $H_2O$

• $H_2$

• NaCl

• Salt Water

• Na

What do we call a pure substance made up of more than one type of atom?

• Element

• Compound

• Molecule

• Mixture

What do we call a positive atom that has lost one or more electrons?

• Cation

• Anion

• Isotope

Which of the following are considered elements?

• $H_2$

• He

• CuO

• KF

• Ni

What do we call an atom of the same element, but with a different number of neutrons.

• Cation

• Anion

• Isotope

How many protons are there in:

 $_{20}^{40}Ca^{+2}$  ?

• 20

• 40

• 22

• 18