Law of Conservation of Mass

The law of conservation of mass states...

• Matter can neither be created nor destroyed. The mass of all the reactants must equal the mass of all the products.

• Matter can be created and destroyed in an open system. The mass of all the reactants must equal the mass of all the products.

• Matter can neither be created nor destroyed. The mass of all the reactants sometimes equal the mass of all the products.

• Matter can be created and destroyed. The mass of all the reactants must never equals the mass of all the products.

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

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

Does the equation H₂+O₂ →H₂O follow the Law of Conservation of Mass?

• Yes, because the atoms are equal.

• No, because more info is needed.

• No, because there are more atoms in the product.

• No, because there are more atoms in the reactant.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The law of conservation of mass states...

• Matter can neither be created nor destroyed. The mass of all the reactants must equal the mass of all the products.

• Matter can be created and destroyed in an open system. The mass of all the reactants must equal the mass of all the products.

• Matter can neither be created nor destroyed. The mass of all the reactants sometimes equal the mass of all the products.

• Matter can be created and destroyed. The mass of all the reactants must never equals the mass of all the products.

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

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-PS1-2

NGSS.MS-PS1-5

• Yes, because the atoms are equal.

• No, because more info is needed.

• No, because there are more atoms in the product.

• No, because there are more atoms in the reactant.

Tags

NGSS.MS-PS1-5

Which of the following best describes the Law of Conservation of Mass in a closed system?

• Mass is lost during chemical reactions.

• Mass is gained during chemical reactions.

• Mass remains constant during chemical reactions.

• Mass can be either gained or lost during chemical reactions.

Tags

NGSS.MS-PS1-5

In the reaction @@ ext{2H}_2 + ext{O}_2 ightarrow ext{2H}_2 ext{O}@@, if you start with 10g of hydrogen and 80g of oxygen, what will be the total mass of water produced?

• 90g

• 70g

• 100g

• 80g

Tags

NGSS.MS-PS1-5