Law of Conservation of Mass

Reactants: 50 g of substance A, ? g of substance B.

Products: 75 g of substance C, 25 g of substance D.

Find the mass of substance B.

• 25 g

• 50 g

• 75 g

• 100 g

Tags

NGSS.MS-PS1-5

Reactants: 56 g of iron, ? g of oxygen.

Products: 80 g of iron(III) oxide.

Find the mass of oxygen that reacted.

• 24 g

• 56 g

• 80 g

• 104 g

Tags

NGSS.MS-PS1-5

In a reaction, if the products weigh 228.4 g, what should be the total mass of the reactants?

• 228.4 g

• 200 g

• 250 g

• 180 g

Tags

NGSS.MS-PS1-5

In a reaction with 112 g of iron and 96 g of sulfur, what is the mass of iron(II) sulfide produced?

• 200 g

• 208 g

• 216 g

• 224 g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Let's consider the reaction between silver nitrate and sodium chloride:

Silver nitrate + Sodium chloride → Silver chloride + Sodium nitrate

If we start with 169.9 g of silver nitrate and 58.5 g of sodium chloride, what is the total mass of the products that are formed?

(a)  

Tags

NGSS.MS-PS1-5

The following reaction occurs when propane combusts:

propane + oxygen → carbon dioxide + water

When 143.15 g of propane reacts completely with 519.40 g of oxygen, 428.61 g of carbon dioxide are formed.

What is the mass of water?

(a)  

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The following reaction occurs when methane combusts:

methane + oxygen → carbon dioxide + water

Masses of 44.0 g of carbon dioxide and 36.0 g of water are collected after 64.0 g of oxygen reacts completely with methane. What mass of methane was used in the reaction?

(a)  

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The decomposition of calcium carbonate is given in the following reaction.

calcium carbonate → carbon dioxide + calcium oxide

What is the mass of calcium oxide produced if 100.09 g calcium carbonate forms 44.01 g carbon dioxide

(a)  

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The law of conservation of mass says the bonds between atoms are​ (a)   to form new substances with new properties.

• fused

• created

• destroyed

• broken and rearranged

Tags

NGSS.MS-PS1-5

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

• created
• destroyed
• changed
• equal

Tags

NGSS.MS-PS1-5