Law of Conservation of Mass

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 the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?

• 17g

• 2g

• 7g

• None of the above

Tags

NGSS.MS-PS1-5

The Law of Conservation of Mass States

• Energy cannot be created nor destroyed, it can only change form.

• Mass cannot be created nor destroyed, it can only change form.

• Mass can be created or destroyed, it cannot change form.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

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

In the equation shown, what are the product(s)?

• N₂ + H₂

• NH₃

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

NGSS.MS-PS1-1

To balance an equation you should:

• ONLY change subscripts.

• ONLY change coefficients.

• Change BOTH subscripts and coefficients.

How many Hydrogen (H) atoms are in 4NH₃?

• 4

• 1

• 3

• 12

Tags

NGSS.MS-PS1-1

Is this equation balanced?

• Yes

• No

Tags

NGSS.MS-PS1-5

In a closed system, a chemical reaction starts with 50g of reactants. According to the Law of Conservation of Mass, what should be the total mass of the products?

• 40g

• 50g

• 60g

• 70g

Tags

NGSS.MS-PS1-5

During a chemical reaction, 10g of substance X reacts with 15g of substance Y to form product Z. What is the mass of product Z?

• 20g

• 25g

• 30g

• 35g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2