Chemistry Year Review

What does the atomic number of an element ALWAYS tell you?

• How many neutrons there are in the atom

• The atomic weight of the atom

• How many protons there are in an atom

• How reactive an atom is

What does a catalyst do in a chemical reaction?

• Increases the yield of product

• Increases the rate of reaction

• Makes the reaction safer

• Makes the reaction cheaper to run

Tags

NGSS.HS-PS1-5

What is the most correct description of an 'octet' in chemistry?

• Eight of anything

• The number of electrons an atom needs in its valence shell to be happy

• The number of electrons an atom needs in every shell to be happy

• The number of electrons every atom should have

Which statement below most accurately describes covalent bonding?

• The exchange of electrons

• Donation of electrons to a sea of delocalised electrons

• The sharing of electrons

• The disappearance of electrons

Tags

NGSS.HS-PS1-1

Elements in the periodic table ______ in ___________ from the simplest element to the most complex.

• increase, atomic number

• increase, neutrons

• decrease, atomic number

• decrease, atomic mass

How many electrons does this element have?

• 20

• 10

• 4

• 2

Tags

NGSS.MS-PS1-1

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.

• Matter can only be lost in a chemical reaction.

• Matter can only be gained in a chemical reaction.

• Matter can be gained and lost in a chemical reaction. 

Tags

NGSS.MS-PS1-5

Which subatomic particles have a +1 charge?

• Protons

• Neutrons

• Electrons

• Atoms

When does covalent bonding occur?

• When metals bond together

• When ions bond together

• All the time

• When non-metals bond together

Tags

NGSS.HS-PS1-1

Which of the following does NOT increase the rate of reaction?

• Increasing Temperatire

• Increasing Surface Area

• Increasing Size of the Beaker

• Increasing Pressure