Chemistry Calculations Review

​Chemistry Unit Review

Atoms, Periodic Table, Formulas, and Changes

​Parts Of The Atom

Multiple Choice

The small area in the center of an atom where most of the atom's mass is concentrated.

• neutron
• proton
• electron
• nucleus

Multiple Choice

A subatomic atomic particle that has a positive charge.

• neutron
• proton
• electron
• nucleus

Multiple Choice

A subatomic atomic particle that has a negative charge.

• neutron
• proton
• electron
• nucleus

Multiple Choice

A neutral atomic particle that is located in the atom's nucleus.

• neutron
• proton
• electron
• nucleus

Multiple Choice

The number of protons in an atom of an element.

• atomic number
• atomic mass
• electron shells
• valence number

Multiple Choice

Protons and neutrons are located in an atoms __________________.

• nucleus
• electron shell
• cell
• house

Multiple Choice

Electrons are located in _____________

• a neutron
• a proton
• the nucleus of an atom
•  a cloud orbiting the nucleus of an atom

Multiple Choice

An element's atomic mass is made up of ____________.

• the total number of protons, neutrons and electrons in an atom
• the total number of protons and neutrons in an atomic nucleus 
• the total number of electrons in the electron shell of an atom
• the total number of protons in an atom

Multiple Choice

What number indicates an electron?

• 1
• 2
• 3
• 4

Multiple Choice

Oxygen’s atomic number is 8. This means that an oxygen atom must have

• 8 electrons
• 8 protons
• 8 neutrons
• a mass number of 8

Multiple Choice

 What is the mass number of this element?

• 5
• 27
• 32
• 59

Multiple Choice

What is the number of protons that the element in this image contain?

• 14
• 7
• 15
• 18

Multiple Choice

What is the atomic mass of "F"

• 9
• 18
• 17
• 19

Multiple Choice

What is the mass number of this atom?

• 1

• 3

• 4

• 7

Multiple Choice

Name the element

• Boron

• Carbon

• Nitrogen

• Oxygen

Multiple Choice

Electrons in the outermost orbital.

• Protons
• Neutrons
• Valence Electrons
• Isotopes

​The Periodic Table

​The GROUP an atom is in tells you the number of VALENCE ELECTRONS and how it will REACT

​

The PERIOD an atom is in tells you how many ENERGY LEVELS an atom has.​

Multiple Choice

Each column in the periodic table is called a 

• period
• group
• cluster
• unit

Multiple Choice

The yellow atoms are called 

• metals
• nonmetals
• metalloids
• noble gases

Multiple Choice

How many Valance electrons does Iodine Have?

• 6
• 16
• 7
• 17

Multiple Choice

The period for Bromine is ___________.

• 3
• 2
• 4

Multiple Choice

Beryllium is in group number______.

• Group 2
• Group 3
• Group 4
• Group 7

Multiple Choice

Group 18 elements are known as the _____ _____ and have full valence shells.

• royal gases.
• supreme solids.
• noble gases.
• legit liquids.

Multiple Choice

Elements in the same ________ are more chemically similar.

• group
• period
• club
• table

Multiple Choice

The majority of elements on the periodic table are

• man made.
• nonmetals.
• metals.
• gases.

Multiple Choice

Which elements have the most similar chemical properties?

• K and Na
• K and Ca
• K and Cl
• K and S

Multiple Choice

What period and group is Silver (Ag)? 

• Period 2, Group 1
• Period 3, Group 16
• Period 5, Group 11
• Period 2, 14

Multiple Choice

The elements in this group have 5 valence electrons and include elements N, P, and As.

• Group 5
• Group 1
• Group 18
• Group 15

Multiple Choice

Which of the following is not a property of metals?

• brittle
• malleable
• lustrous
• conductive

Multiple Choice

Rows on the period table are called _____ while columns are called _____.

• groups, families
• groups, periods
• periods, groups
• families, groups

Multiple Choice

How many electrons do atoms need to be stable?

• 1
• 2
• 6
• 8

Multiple Choice

An outermost electron of an atom that participates in chemical bonding is called a(n)____________. They have the most energy of all electrons in an atom.  

• valence electron
• head electron
• available electron
• master electron

Multiple Choice

What color are the metals on this periodic table?

• green
• yellow
• blue

Multiple Choice

What color are the metalloids on this periodic table?

• blue
• yellow
• green

Multiple Choice

What color are the nonmetals on this periodic table?

• blue
• yellow
• green

Multiple Choice

Which Period would this element be found on just by looking at the shells/levels?

• 1
• 2
• 3
• 4

Multiple Choice

Which of the following determines the identity of an element..."what it is"?

• valence electrons
• neutrons
• protons
• energy levels

Multiple Choice

Which of the following determines the reactivity of an element..."what it does"?

• valence electrons
• neutrons
• protons
• energy levels

​Chemical Formulas And Reactions

Multiple Choice

In a chemical formula, this is used to represent the number of each atom being represented. 

• An Exponent
• The Coefficient
• A Molecule
• The Subscript

Multiple Choice

Two or more atoms bonded together. 

• A Molecule
• The Coefficient
• The Subscript
• An Atom Party

Multiple Choice

This appears before a chemical formula; it represents how many molecules there are. 

• An Atom
• The Subscript
• A Molecule
• The Coefficient

Multiple Choice

How many hydrogen atoms are in this chemical formula: 

• 4 hydrogen atoms
• 1 hydrogen atom
• 2 hydrogen atoms
• 3 hydrogen atoms

Multiple Choice

How many molecules are in this chemical formula?

• 4 Molecules
• 6 Molecules
• 2 Molecules
• 5 Molecules

Multiple Choice

How many Iron (Fe) atoms are in this chemical formula?

• 2 iron atoms
• 6 iron atoms
• 5 iron atoms
• 4 iron atoms

Multiple Choice

How many molecules are in this chemical formula?

• 5 molecules
• 4 molecules
• 2 molecules
• 10 molecules

Multiple Choice

In this image, the information in red is called the_______.

• Product
• Reactant
• Chemical Subscript
• Yield

Multiple Choice

In this image, the information to the right of the arrow (in black) is called the_______.

• Product
• Reactant
• Chemical Subscript
• Equation

Multiple Choice

The law of conservation of mass states that....

• Matter can be created
• Matter can be destroyed
• Matter can neither be created or destroyed
• E=mc²

Multiple Choice

Is this balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!
• No!

Multiple Choice

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2
• 6
• 1
• 4

Multiple Choice

If 5 grams of hydrogen gas reacts with 20 grams of oxygen gas, how much water will be produced?
2H₂ + O₂ --> 2H₂0
5g         20g            ?

• 5 grams 
• 20 grams
• 25 grams
• 15 grams

Multiple Choice

Why is the following chemical equation not balanced?
H_{2 +} O₂ → H₂O

• each side of the equation has a different number of oxygen atoms
• each side of the equation has a different number of hydrogen atoms
• each side has the same mass

Multiple Choice

What is the total number of atoms present in 5Na₃PO₄

• 5
• 40
• 55
• 60

Multiple Choice

You know you a chemical reaction has occurred if 

• there is a precipitate.
• there is a color change.
• there is a temperature change.
• All of these answers are evidence.

Multiple Choice

Which is an example of a chemical reaction?

• paper cut into small pieces
• chocolate melting in a pan
• flour and sugar mixed in a bowl
• cookies baking in an oven

Multiple Choice

In the following equation, what are the reactants?
CaO + 3 C → CaC₂ + CO

• CaO + 3 C
• CaC₂ + CO
• 3 C → CaC₂
• the stuff on the outside

Multiple Choice

In the following equation, what are the products?
HCl + Zn → H₂ + ZnCl₂

• HCl + Zn
• H₂ + ZnCl₂
• Zn → H₂
• the stuff on the outside

Multiple Choice

30 g of NaCl was broken into 20 g of Na and some Cl₂. How much Cl₂ was produced?

• 10 g
• 20 g
• 30 g
• 2 g

Multiple Choice

45 g of H₂O₂ was broken into 30 g of H₂O and O₂ gas. How much O₂ gas was made?

• 15 g
• 75 g
• 3 g
• 30 g