chemistry review

What is the little number after an element in a chemical equation called.
Example: H₂

• Coefficient 
• Subscript
• Atom
• Equation

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction

Tags

NGSS.MS-PS1-5

When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced

• charge
• subscript
• random number
• coefficient

Tags

NGSS.MS-PS1-5

Balance this equation:
 2Li + Cl₂ -> LiCl

• 2Li + Cl₂ -> 4LiCl2
• 2Li + Cl₂ -> LiCl₂
• 2Li + Cl₂ -> 2LiCl

Tags

NGSS.MS-PS1-5

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-PS1-2

NGSS.MS-PS1-5

How many F atoms are in this compound?
6MgF₂ 

• 2
• 6
• 8
• 12

Tags

NGSS.MS-PS1-1

How many atoms are there TOTAL in:
H₂SO₄

• 6
• 5
• 7
• 3

Tags

NGSS.MS-PS1-1

Which of the following is evidence of a chemical reaction?

• fizzing
• water changing to ice
• saltwater
• paper being cut in half

Tags

NGSS.MS-PS1-2

Why must we balance chemical equations? 

• Our teacher said so
• to abide by the law of conservation of energy
• to abide by the law of conservation of mass

Tags

NGSS.MS-PS1-5

Which one is a compound?

• Co
• Br
• Fe
• CO

Tags

NGSS.MS-PS1-1