Chemistry 101

Chemistry 101.....LET'S GOOOOO

Multiple Choice

Which of the following best describes a mixture?

• A combination of two or more substances that are chemically combined.

• A combination of two or more substances that are mixed together but not chemically combined.

• A substance that cannot be separated into simpler substances.

• A substance that changes from a liquid to a gas at room temperature.

Fill in the Blanks

The temperature at which a substance changes from a liquid to a gas is called the

.

Periodic Table divisions:

• The Periodic Table is divided into groups and periods.

• Groups run up and down.

• Periods run side to side.

• REMEMBER: "The groups! The groups! The groups are in columns! The rows! The rows! The rows are periods!

Multiple Choice

Groups run:

• up and down

• left to right

Multiple Choice

Periods run:

• up and down

• left to right

Periodic Table Groups:

• Groups are also called "families"

• REMEMBER*: Groups are in "columns!"

• Groups share common characteristics; i.e. All group 1 elements explode in water. All group 18 elements DON'T react.

• Fluorine and Chlorine are in the same GROUP (17), SO, they share the same PROPERTIES.

Periodic Table Periods:

• Periods run in rows.

• Each period has the same number of electron shells. i.e. Hydrogen and Helium have 1 electron shell. Lithium and Boron have 2.

• This means each period has the same number of ENERGY LEVELS!

Metals

• Luster (shiny)

• Malleable (bends)

• Good conductor (moves heat & electricity)

Metalloids

• Luster (shiny)

• Brittle (breaks)

• Semi-conductor (kind of moves heat & electricity)

Nonmetals

• Dull (not shiny)

• Brittle (breaks)

• Insulators (does not move heat & electricity)

Multiple Choice

What is an atom?

• A large molecule

• Largest piece of matter

• Smallest piece of matter

• A molecule made of ions

Multiple Choice

What is the center of an atom called?

• Proton

• Neutron

• Electron

• Nucleus

Multiple Select

Which of these below are CANNOT be an element? (check all that apply)

• d

• H

• He

• HE

• C

Multiple Choice

What is the atomic number of the element oxygen?

• O

• 8

• 15.999

Multiple Choice

What is the atomic mass of the element potassium?

• K

• 39.098

• 19

Multiple Choice

What is a proton?

• A subatomic particle that is negatively charged

• A subatomic particle that is positively charged

• A subatomic particle that has no charge

• A subatomic particle that is located outside of the nucleus

Multiple Choice

What is a neutron?

• A subatomic particle that is negatively charged

• A subatomic particle that is positively charged

• A subatomic particle that has no charge

• A subatomic particle that is located outside of the nucleus

Multiple Select

Choose all of the correct answers about electrons.

• Electrons are positively charged subatomic particles inside the nucleus

• Electrons are negatively charged subatomic particles

• Electrons are subatomic particles with no charge

• Electrons are located outside of the nucleus in the electron cloud

Multiple Select

Which subatomic particles are found inside the nucleus?

• Protons

• Neutrons

• Electrons

• Quarks

Multiple Choice

True or False: The number of protons and neutrons are always the same

• False

• True

Multiple Choice

What is atomic mass?

• Protons + neutrons

• Protons + electrons

• Neutrons + electrons

• Neutrons + quarks

Multiple Choice

How many protons does an atom of Nitrogen have?

• 7

• 14

• 21

Multiple Choice

If Carbon has an atomic mass of 12 and has 6 protons, how many electrons does it have?

• 18

• 6

• 12

Multiple Choice

What is the atomic number of this atom?

• 3

• 6

• 9

Multiple Choice

What is the atomic mass of this element?

• 1

• 2

• 3

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Subatomic Particles

• Atoms are made of the subatomic particles.

• Protons and neutrons are in the center of the atom. The center of the atom is called the nucleus.

• Electrons move around the outside layer of the atom. This area is called the electron cloud

Electrons

• Electrons are located on the outside of the atom.

• This area is referred to as the electron cloud or as orbits.

• The electrons have a negative charge and move around the nucleus.

Molar Mass

​The molar mass of any element is the same number as the atomic mass on the periodic table.

​The molar mass is how many grams of the substance are in one mole of the substance. Its unit is g/mol.

Multiple Choice

What is the atomic mass of this atom?

• 14

• 21

• 7

Multiple Choice

How many electrons are in Helium?

• 2

• 4

All matter have properties.

The three basic states of matter

Multiple Choice

At higher temperatures

• particles in an object have less energy

• particles in an object move faster

• a gas contracts

Multiple Choice

Which of the following is a sign that a chemical reaction has occurred?

• change in shape

• melting

• formation of a gas

• dissolving

Multiple Choice

What is the symbol for gold?

• G

• Au

• g

• Go

Multiple Choice

What is the chemical symbol for Iron?

• I

• i

• Fe

• FE

Fill in the Blanks

The smallest unit of matter that makes up the universe

Multiple Choice

At what point does a substance change from a solid to a liquid?

• Boiling Point

• Freezing Point

• Melting Point

• Condensation Point