Law of Conservation of Mass Question Bank

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

NGSS.MS-PS1-2

What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?

• They both will weigh the same
• The product always weighs more than the reactant
• The reactant will weigh more than the product
• They both will loose mass after the reaction

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

• The wood disappears.

• It stays the same chemically.

• The atoms in the wood and oxygen rearrange and form smoke and ash.

• Nothing.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Is this equation balanced?

• Yes

• No

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Is this equation balanced?

• Yes

• No

Tags

NGSS.MS-PS1-5

For the equation:
2H₂ +  O₂ --> 2H₂O
How much H₂O will be produced if we react 4g of H₂ and 32g of O₂?

• 4g
• 32g
• 36g
• 28g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

P4O10 had a mass of ​12g , and H3PO4 has a mass of 90g, accroding t the law of conservation of mass what is H2O mass? ​ ​ (a)  

• 78g
• 102
• 102g
• 90g
• 12g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

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-PS1-5

NGSS.MS-PS1-2

Is this equation balanced or unbalanced? 
2Fe₂O₃ + 3C --> 4Fe + 3 CO₂

• balanced
• unbalanced

Tags

NGSS.MS-PS1-5

If a reaction starts with a total 75g of reactants it should produce 

• a total of 40g of products
• a total of 75g of products
• a total of 180 g of products
• None of the above

Tags

NGSS.MS-PS1-5