In a reaction A + B --> C,  

reactant A has 5g and product C has 9g. How many grams does reactant B should have? 

• 4g

• 5g

• 9g

• 14g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is this equation balanced or unbalanced? 
H₂ + O₂ --> H₂O

• balanced
• unbalanced

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Number placed in front of a chemical formula is a (a)   and a small number placed after an element is a ​ (b)  

• product
• coefficient
• reactant
• subscript
• superscript

Substances that are used at the beginning to create a chemical reaction are the ​ (a)   Substances that form as the result of a chemical reaction are the

(b)   .

• products
• reactants
• coefficients
• subscripts
• starters
• chemicals
• resultants

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The Law of Conservation of Mass says that matter can neither be __________ or __________.

• created; destroyed

• recycled; renewed

• subtracted; added

• joined; separated

Tags

NGSS.MS-PS1-5

Anthony adds 0.25 grams of baking soda to 5 grams of water and stirs. He watches as the baking soda dissolves in the water. If Anthony weighs the final solution, what will its mass be?

• 4.75 grams

• 5.0 grams

• 5.25 grams

• 7.5 grams

Tags

NGSS.MS-PS1-5

Jason poured 500 grams of water into a container and tightly sealed it. The water was allowed to freeze. Which is most likely true about the ice that formed?

• The mass of the ice is the same as the mass of the water.
• The mass of the ice is greater than the mass of the water.
• The ice formed is a different substance than the water.
• The ice formed is the same temperature as the water.
  

Tags

NGSS.MS-PS1-5

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products
• a total of 10g of products
• a total of 80 g of products
• a total of 20g of products

Tags

NGSS.MS-PS1-5

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5