S2 Balancing Equations

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.HS-PS1-7

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.HS-PS1-7

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

• 2

• 6

• 1

• 4

Name the part in red:

H₂ + O₂ -> H₂O

• Coefficient
• Product
• Yield
• Subscript

Tags

NGSS.HS-PS1-7

Name the part in red:

_2_H₂ + _1_O₂ -> _2_H₂O

• Coefficient
• Product
• Yield
• Subscript

Tags

NGSS.HS-PS1-7

What is the arrow in a chemical equation...

H_{2 +} O₂ --> H₂O

• Reactants

• Products

• Yields

• Chemical Equation

Tags

NGSS.MS-PS1-5

When a CHEMICAL reaction occurs, what is made?

• No new substance is made.
• A new substance is made with new atoms formed
• A new substance is made, with existing atoms rearranged
• All substances remain the same, but physical state may change.

Tags

NGSS.HS-PS1-7

Name the part in red:

H₂ + O₂ -> H₂O

• Coefficient
• Product
• Reactant
• Subscript

Tags

NGSS.MS-PS1-1

Name the part in red:

H₂ + O₂ -> H₂O

• Coefficient
• Product
• Reactant
• Subscript

What does this word equation represent: Iron + oxygen → Iron oxide

• A physical change in iron (nothing new gets made)
• A chemical reactino between iron and oxygen, where rust (iron oxide) is produced
• A chemical reaction between iron and rust, where oxygen is produced
• A physical change between iron and oxygen that forms a red color