Law of Conservation of Mass

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction

• Mass is created in a physical change

• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants

• Mass is never created or destroyed

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

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

Matter can not be created nor destroyed: it can only be

• Destroyed a little bit

• Invisible

• Transformed, changed

• None of the above

Tags

NGSS.MS-PS1-5

The Law of Conservation of Mass states that matter cannot be ​ (a)   or ​ (b)   , but it can change ​ (c)  

• created

• destroyed

• form

• melted

• frozen

Tags

NGSS.MS-PS1-5

The Law of Conservation of ​ (a)   states that ​ (b)   cannot be ​ (c)   or ​ (d)   , only ​ (e)   .

• Mass

• matter

• created

• destroyed

• changed

Tags

NGSS.MS-PS1-5

Mass can not be created or destroyed ​ (a)  

• false

• true

Tags

NGSS.MS-PS1-5

According to the Law of Conservation of Mass, matter can never be​ (a)   or​ (b)   , but it can be​ (c)   .

• created

• destroyed

• changed

Tags

NGSS.MS-PS1-5

According to the Law of Conservation of Mass (Matter), Matter cannot be ​ (a) ​ (a)     or ​ (b)  ​ (b)   , it can only be ​ (c) ​ (c)     . This means however many atoms of an element we have before a reaction must be ​ (d) ​ (d)     to the number after a reaction.

• created

• destroyed

• changed

• equal

Tags

NGSS.MS-PS1-5

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

• balanced

• unbalanced

Tags

NGSS.MS-PS1-5