Chemistry Review for Midterm

How many significant figures are in 0.0020 m?

• 1

• 5

• 4

• 2

• 3

Which of the following is a chemical change?

• alcohol evaporating

• ice melting

• food digesting

• cutting your hair

Which of the following is not a chemical change

• iron rusting

• a cake baking

• Salt dissolving in water

• vinegar and baking soda reacting to form carbon dioxide

How many Oxygen atoms are in Al₂(CO₃)₃

• 6

• 9

• 3

• 5

What is the correct chemical formula for diphosphorus pentoxide?

• PO

• P₂O₃

• P₂O₅

• P₂O₄

Which of the following is the correct formula for Calcium Chloride

• CaCl₂

• CaCl

• CaCl₃

How many protons, electrons, and neutrons are in ³¹P

• 15 protons

  14 electrons

  15 neutrons

• 31 protons

  31 electrons

  31 neutrons

• 15 protons

  15 electrons

  15 neutrons

• 15 protons

  15 electrons

  16 neutrons

Calcium is a _____

• Metal

• nonmetal

• semi-metal or metalloid

Pure water is a ______

• element

• Compound

• homogenous mixture

• heterogeneous mixture

Air is an example of a____

• Element

• compound

• homogeneous mixture

• heterogeneous mixture