Chemistry

Which of the following pieces of equipment is the most precise tool to measure 52.5 mL of a liquid?

• a beaker

• an Erlenmeyer flask

• a graduated cylinder

• a 50 mL pipet

Which of the following units of mass is larger than a gram?

• kilogram

• nanogram

• miligram

• centigram

How many significant figures are in 12.05 mL

• 4

• 2

• 12

• 5

What is the overall charge in the nucleus of a sodium atom?

• +1

• -1

• 0 (neutral)

• +11

If an ion has a charge of +2, which of the following must be true?

• it has two more protons than electrons

• it has two more electrons than protons

• it has two more protons than neutrons

• it has two more neutrons than electrons

What type of element is calcium?

• metal

• nonmetal

• metalloid

What type of element is chlorine?

• metal

• nonmetal

• metalloid

Which element would have chemical properties similar to those of bromine?

• iodine

• krypton

• boron

• selenium

Which of the following examples is the result of a physical change?

• the burning of propane in a gas grill

• the rusting of an iron nail

• the melting of an ice cube in a glass of soda

• the baking of cookies in an oven

Which of the following compounds is an ionic

• O₂

• H₂O

• CHCl₂

• CaCl₂