2021 Chemistry Fall Final Review

Which is an acceptable way to protect your hands and clothes in the chemistry laboratory?

• Wear gloves and an apron

• Wear closed toed shoes and tie back hair

• Wear safety glasses

• Don't do labs :(

Which statement describes a chemical property of water?

• Melting point of water is 0^oC

• Dissolves table salt

• Forms beads on a waxy surface

• Will break apart into hydrogen and oxygen

Three ice cubes are mixed into a glass of water. Classify the mixture that exists before the ice cubes are completely melted.

• Homogeneous mixture of solid and liquid

• Heterogeneous mixture of solid and liquid

• Intermediate between homogeneous and heterogeneous

• Alternating between homogeneous and heterogeneous

How can you tell the difference between a pure substance and a mixture?

• pure substances can be separated by physical means; mixtures are separated by chemical means

• pure substances are always the same; mixtures may change in their make up

• pure substances may change in their make up; mixtures are always the same

• I don't know. Send help.

A vertical column (up and down) on the periodic table is called

• family/group

• period

• property

• collection

Which of the following is a physical change?

• corrosion

• explosion

• evaporation

• rotting

What are the relative masses of the three subatomic particles?

• Proton = 1, neutron = 1.5, electron = 0.5

• Proton = 1, neutron = 1, electron = 1

• Proton = 1, neutron = 1.25, electron = 0.25

• proton = 1, neutron = 1, electron = 1/1840

How is atomic number different from mass number?

• Atomic number = protons and electrons; mass number = electrons

• Atomic number = protons; mass number = protons + neutrons

• Atomic number = neutrons; mass number = protons + neutrons

• There is no difference between atomic number and mass number

How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 have?

• 50 protons, 50 electrons, 75 neutrons

• 50 protons, 75 electrons, 50 neutrons

• 50 protons, 75 electrons, 120 neutrons

• 75 protons, 50 electrons, 70 neutrons

Tags

NGSS.MS-PS1-1

Which symbols represent isotopes of the same element?

• 1 and 2

• 3 and 4

• 1 and 4

• 2 and 3

Tags

NGSS.HS-PS1-8