Conservation of Mass

1.

Multiple Choice

45 sec

1 pt

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

2.

Multiple Choice

20 sec

1 pt

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

3.

Multiple Choice

30 sec

1 pt

Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble, and produce a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened.

His chemical reaction defied the law of conservation of mass

The product destroyed mass during the reaction

The reactants created matter during the reaction

The gas that was produced was not able to be weighed since the container was open.

4.

Multiple Choice

30 sec

1 pt

Evidence of a chemical reaction include:

Phase change

No new substance

Bubbles forming

Shape change

5.

Multiple Choice

30 sec

1 pt

Evidence of a chemical change does NOT include:

New substances

Heat produced

Phase change

Light produced

6.

Multiple Choice

30 sec

1 pt

How is a physical change different from a chemical change?

There is absolutely no difference

Chemical changes produce a new substance, physical changes stay the same substance

Chemical changes create and destroy matter, physical changes don't

Physical changes create and destroy matter, chemical changes dont

7.

Multiple Choice

30 sec

1 pt

If four hydrogen atoms react with two hydrogen atoms, how many atoms will be in the product?

6

4

8

2

8.

Multiple Choice

30 sec

1 pt

10 g of a solid chemical reacts with a 10 g of a liquid chemical, the reaction bubbles and changes the color of the liquid. The colored liquid weighs 13 g, what can be concluded?

The gas produced from the bubbles weighed 5 g

The bubbles were evidence of 7 g of matter being destroyed

The gas produced weighed 7 g

The gas produced weighed 13 g

9.

Multiple Choice

30 sec

1 pt

Since gasses weigh nothing, when they are produced in a reaction they do not have to be accounted for.

True

False

10.

Multiple Choice

30 sec

1 pt

All chemical equations create or destroy matter, which is why scientists weigh their reactants so they can see how much was created or destroyed

True

False

11.

Multiple Choice

2 mins

1 pt

A student mixed 120 grams of sugar, 275 grams of water, and 10 grams of flavoring. The solution weights:

410 grams

405 grams

120 grams

275 grams

12.

Multiple Choice

2 mins

1 pt

15 grams of vinegar is added to 100 grams of milk. It thickens slightly. What does the solution weigh?

120 grams

100 grams

116 grams

115 grams

13.

Multiple Choice

2 mins

1 pt

A student adds 3 spoons of solid to 100 mL of water. The solution is clear, with nothing on the bottom of the cup. One spoon of the solid has a mass of 5 grams. What is the mass of the solution?

115 grams

110 grams

103 grams

100 grams

14.

Multiple Choice

2 mins

1 pt

What does the Law of Conservation of Matter refer to?

Matter can not be created or destroyed

Matter can be created but not destroyed

Matter can be destroyed but not created

Matter is being lost everyday

15.

Multiple Choice

2 mins

1 pt

A house made of toy blocks is weighed. It is taken apart and each block weighed separately. If the weight of all the blocks is added, what will it total?

A little less than the weight of the house

It would depend on how large the house was

The same as the house

A little more then the weight of the house

16.

Multiple Choice

30 sec

1 pt

The total amount of mass in a system does not change during a chemical reaction

Chemical Reaction

Counting Atoms

Law of Conservation of Mass

Law of Conservation of Volume

17.

Multiple Choice

30 sec

1 pt

_____________________ _____________________ can be when matter changes states or appearance but the matter and mass stay the same. No other change occurs.

Noticeable change

Chemical change

Physical exam

Physical change

18.

Multiple Choice

30 sec

1 pt

The principle that states that all mass stays the same even though a change in the matter occurs is called __________________________ ____ ____________________.

Matter of fact

Consistency of matter

Conservation of matter

Conversation of liquids

19.

Multiple Choice

30 sec

1 pt

A ___________________________ ___________________________________ causes a material to change into an entirely different material with different properties, but conserves matter.

physical change

chemical

chemical change

physical chemical interaction

20.

Multiple Choice

30 sec

1 pt

The process by which a chemical change happens is ____________________________ ______________________________.

chemical reaction

chemical physical solubility

physical reaction

solution

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