Coefficient/Subscript/Atoms Review

Coefficient vs Subscript

• Coefficient: Numbers in front of a formula which gives the total number of compounds.

• Subscripts: The small number to the bottom right of an element, which tells the number of atoms of the element immediately before it.

Practice with Chemical Formulas: Subscripts

Subscripts tell you the number of atoms.

Practice with Chemical Formulas: Subscripts

Subscripts always follow the element.

Practice with Chemical Formulas: Subscripts

If there's no subscript, there's only one atom.

Multiple Choice

The blue numbers in the image below represent ________

• coefficients

• subscripts

Multiple Choice

What does the following represent?

• coefficient

• subscript

• elements

Multiple Choice

What does the number ₃ represent in 4NH₃?

• Subscript

• Superscript

• Coefficient

Help with Chemical Formulas: Subscripts

Coefficients tell you the number of molecules. If there's no coefficient, there's only 1 molecule.

Multiple Choice

How many total molecules is 4NH₃?

• 4

• 1

• 3

• 12

Multiple Choice

What does the number 4 represent in 4NH₃?

• Subscript

• Superscript

• Coefficient

Multiple Choice

How many carbon dioxide molecules? $$3CO_2$$  

• 1

• 2

• 3

• 4

Multiple Choice

The red numbers in the image below represent ________

• subscripts

• coefficients

Multiple Choice

What is the Coefficient?

• 4

• 3

• 1

• 0

Multiple Choice

What is the Coefficient?

• 4

• 3

• 1

• 0

Multiple Choice

What is the subscript of Nitrogen?

• 4

• 3

• 1

• 0

Multiple Choice

How many ELEMENTS are in the this chemical equation?

• 1

• 3

• 24

• 27

Multiple Choice

How many ATOMS of hydrogen (H) are in this chemical equation?

• 3

• 6

• 12

• 24

Multiple Choice

How many TOTAL ATOMS are in this chemical equation?

• 3

• 6

• 12

• 24

Multiple Choice

What is the center of the atom called?

• Proton

• Electron Cloud

• Nucleus

• Neutron

Multiple Choice

What is the atomic MASS of Neon?

• 10

• 20

• 30

Multiple Choice

What is the atomic NUMBER?

• 35

• 18

• 17

• 52

Multiple Choice

Which is an electron?

• a

• b

• c

Multiple Choice

The atomic NUMBER tells you what?

• number of electrons

• number of protons

• number of neutrons

• the number of both electrons and protons

Multiple Choice

The symbol for Oxygen is ____.

• O

• Na

• Fl

Multiple Choice

a substance that consists of only one type of atom

• element

• compound

• molecule

• chemical bond

Multiple Choice

Hydrogen is an example of a(n)-

• element

• compound

Multiple Choice

Water is an example of a(n)-

• element

• compound

Multiple Choice

Which is an element?

• NaCl

• H

Multiple Choice

Which is a compound

• Li

• NO

Multiple Choice

Which is an element-

• CO

• Co

Multiple Choice

Which is a compound?

• OH

• Ho

Multiple Choice

Element or compound?
H₂O

• element

• compound

Multiple Choice

How many elements are represented in the compound?
Na₂CO₃

• 1

• 2

• 3

• 4

Multiple Choice

How many elements are in Be₂CO

• 1

• 2

• 3

• 4

Multiple Choice

The chemical formula H₂O has:

• 2 hydrogen atoms and 2 oxygen atoms

• 2 hydrogen atoms and 1 oxygen atoms

• 1 hydrogen atom and 2 oxygen atoms

• 1 hydrogen atom and 1 oxygen atom

Multiple Choice

This picture represents which of the following?

• element

• compound

Multiple Choice

This picture represents which of the following?

• element

• compound

Multiple Choice

This picture represents which of the following?

• element

• compound

Multiple Choice

This picture represents which of the following?

• element

• compound

Multiple Choice

How many elements are represented in the compound?

Na₂CO₃

• 1

• 2

• 3

• 6

Multiple Choice

How many total atoms are in the compound C₂H₈O ?

• 11

• 2

• 8

• 1

Multiple Choice

How many atoms of Hydrogen are in this compound

• 1

• 2

• 3

• 4

Multiple Choice

Carbon dioxide (CO₂) contains how many atoms of oxygen?

• 0

• 1

• 2

• 3

Multiple Choice

H₂SO₄

• H = 2, S = 4, O = 4

• H = 2, S = 1, O = 4

• H = 8, S = 4, O = 4

• H = 2, SO = 4

Multiple Choice

How many ELEMENTS are in this chemical equation?

• 3

• 4

• 9

• 10

Multiple Choice

How many Carbon are in the compound?

• 4

• 5

• 20

• 9

Multiple Choice

How many elements does PbNO₃ have?

• 2

• 3

• 4

• 5

Multiple Choice

How many Magnesium atoms are there in Mg₃N₂?

• 1

• 2

• 3

• 4

Multiple Choice

How many Hydrogen atoms are there in Pentane, C₅H₁₂?

• 5

• 12

• 1

• 2

Multiple Choice

The atomic mass is the

• number of protons and neutrons inside the nucleus

• number or electrons or protons

• number of protons, neutrons and electrons

Multiple Choice

A __________ goes up and down on the periodic table.

• Group

• Period

Multiple Choice

How many atoms of Iron are in this compound?

• 1

• 2

• 3

• 4

Multiple Choice

Ozone is $$O_3$$  . How many oxygen atoms does it have?

• 1

• 2

• 3

• 4

Multiple Choice

Rust is $$Fe_2O_3$$  . How many oxygen atoms does it have?

• 1

• 2

• 3

• 4

Multiple Choice

A _________ goes side to side on the periodic table.

• Group

• Period

Multiple Choice

Glucose is $$C_6H_{12}O_6$$  . How many hydrogen atoms does it have?

• 6

• 8

• 12

• 18

Metals

• Lustrous (shiny)

• Good conductors of heat and electricity

• High melting point

• High density (heavy for their size)

• Malleable (can be rolled or hammered into flat sheets)

• Ductile (can be pulled into wires)

• Usually solid at room temperature (an exception is mercury)

Ductile

Can be pulled into wire

Malleable

Hammered or rolled into sheets

Nonmetals

• Not lustrous (dull appearance)

• Do not conduct heat and electricity well

• May be solids, liquids or gases at room temperature

• Brittle