Quiz about EI3 Quiz

Question 1

In the chemical formula $$C_{12}H_{22}O_{11}$$ , how many elements are there?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 2

In the chemical formula $$C_{12}H_{22}O_{11}$$ , how many C atoms are there?

Accepted Answer

12

Answer

22

Answer

11

Answer

45

Question 3

In the chemical formula $$C_{12}H_{22}O_{11}$$ , how many O atoms are there?

Accepted Answer

11

Answer

12

Answer

22

Answer

45

Question 4

In the chemical formula $$C_{12}H_{22}O_{11}$$ , how many H atoms are there?

Accepted Answer

22

Answer

12

Answer

11

Answer

45

Question 5

What is the TOTAL number of atoms in the chemical formula $$C_{12}H_{22}O_{11}$$ ?

Accepted Answer

45

Answer

12

Answer

22

Answer

11

Question 6

Which of the following substances CANNOT be broken down into simpler substance? ?

Accepted Answer

$$Na$$

Answer

$$H_2O$$

Answer

$$C_6H_{12}O_6$$

Answer

$$CO$$

Question 7

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

Accepted Answer

During a chemical reaction, the total amount of matter stays the same.

Answer

During a chemical reaction, matter is destroyed.

Answer

During a chemical reaction, the total number of atoms increases.

Answer

During a chemical reaction, one or more new substances are formed.

Question 8

What happens to the total mass of the substances after a chemical reaction?

Accepted Answer

It remains the same.

Answer

It decreases.

Answer

It increases.

Answer

It increases then decreases.

Question 9

In a chemical reaction, the number of atoms in the products will always equal which amount?

Accepted Answer

the number of atoms in the reactants

Answer

half of the number of atoms in the reactants

Answer

twice the number of the atoms in the reactants

Answer

thrice the number of the atoms in the reactants

Question 10

Jin bought a heat pack that weighs 15 g. He shook it so it would release heat to warm his hands. The release of heat indicates a chemical reaction took place in a closed system. What would be the mass of the heat pack after the chemical reaction?

Accepted Answer

15 g

Answer

5 g

Answer

10 g

Answer

12 g

Question 11

The chemical formula for baking soda is $$NaHCO_3$$ . How many O atoms does it have?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 12

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

Accepted Answer

Transformed, changed

Answer

Destroyed a little bit

Answer

Invisible

Answer

None of the above

Question 13

The number to the lower side of an element is a

Accepted Answer

Subscript

Answer

Superscript

Answer

Coefficient

Answer

Charge

Question 14

The number in front of a compound or element is a

Accepted Answer

Coefficient

Answer

Subscript

Answer

Superscript

Answer

Charge

Question 15

A chemical reaction is balanced when

Accepted Answer

Both sides have the same  number of atoms

Answer

both sides have the same elements

Answer

Same subscripts

Answer

Same coefficients

Question 16

If reaction starts with 20g of reactants it should produce

Accepted Answer

a total of 20g of products

Answer

a total of 40g of products

Answer

a total of 10g of products

Answer

a total of 80 g of products

Question 17

What is the Law of Conservation of mass?

Accepted Answer

Mass is never created or destroyed

Answer

Mass is created in a chemical reaction

Answer

Mass is created in a physical change

Answer

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

Question 18

Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will most likely be the mass of the frozen water?

Accepted Answer

200 g

Answer

50 g

Answer

100 g

Answer

400 g

Question 19

How many atoms do you have in the compound 2MgCl₂?

Accepted Answer

6 atoms

Answer

2 atoms

Answer

4 atoms

Answer

8 atoms

Question 20

How many Ca (Calcium) atoms are found in Ca(OH)_2?

Accepted Answer

1 atom

Answer

5 atoms

Answer

3 atoms

Answer

2 atoms

Question 21

What does the number ₃ represent in 4NH₃?

Accepted Answer

Subscript

Answer

Superscript

Answer

Coefficient

Question 22

What does the number 4 represent in 4NH₃?

Accepted Answer

Coefficient

Answer

Subscript

Answer

Superscript

Question 23

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

Accepted Answer

N2 + H2

Answer

NH3

Question 24

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

Accepted Answer

NH3

Answer

N2 + H2

Question 25

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

Accepted Answer

Transformed, changed

Answer

Destroyed a little bit

Answer

Invisible

Answer

None of the above

Question 26

The number to the lower side of an element is a

Accepted Answer

Subscript

Answer

Superscript

Answer

Coefficient

Answer

Charge

Question 27

The number in front of a compound or element is a

Accepted Answer

Coefficient

Answer

Subscript

Answer

Superscript

Answer

Charge

Question 28

A chemical reaction is balanced when

Accepted Answer

Both sides have the same  number of atoms

Answer

both sides have the same elements

Answer

Same subscripts

Answer

Same coefficients

Question 29

Which of these is not a chemical reaction?

Accepted Answer

Melting of ice

Answer

Burning of wood

Answer

Milk going bad

Answer

Mixing vinegar and baking soda

Question 30

If reaction starts with 20g of reactants it should produce

Accepted Answer

a total of 20g of products

Answer

a total of 40g of products

Answer

a total of 10g of products

Answer

a total of 80 g of products

Question 31

In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have?

Accepted Answer

4g

Answer

5g

Answer

9g

Answer

14g

Question 32

What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?

Accepted Answer

They both will weigh the same

Answer

The product always weighs more than the reactant

Answer

The reactant will weigh more than the product

Answer

They both will loose mass after the reaction

Question 33

Measure of the amount of matter

Accepted Answer

mass

Answer

volume

Answer

weight

Answer

density

Question 34

What is the Law of Conservation of mass?

Accepted Answer

Mass is never created or destroyed

Answer

Mass is created in a chemical reaction

Answer

Mass is created in a physical change

Answer

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

Question 35

The Law of Conservation of Mass states Matter is NEITHER created nor destroyed.

Accepted Answer

True

Answer

False

Question 36

The Coefficient (3) in the Chemical Formula, 3H₂O, tells you how many _____________ there are.

Accepted Answer

Molecules of Water

Answer

Atoms of Hydrogen

Answer

Atoms of Oxygen

Answer

Atoms of Water

Question 37

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

Accepted Answer

During a chemical reaction, the total amount of matter stays the same.

Answer

During a chemical reaction, matter is destroyed.

Answer

During a chemical reaction, the total number of atoms increases.

Answer

During a chemical reaction, one or more new substances are formed.

Question 38

A precipitate is a

Accepted Answer

a solid that forms when two liquids are mixed

Answer

liquid that forms when two solids are reacted

Answer

a gas that forms when vinegar and baking soda react

Answer

a change of color in a solution

Question 39

Bob puts 200 grams of ice into a pitcher with 900 grams of water. He gets distracted and comes back later to find that the ice has melted in the water. How many grams of water does Bob now have in the pitcher?

Accepted Answer

1,100 g

Answer

200 g

Answer

700 g

Question 40

24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride

Accepted Answer

62

Answer

38

Answer

24

Answer

14

Question 41

Mixing baking soda and vinegar causes bubbles of carbon dioxide gas to form. Which of the following statements is true?

Accepted Answer

A chemical change happened because a new gas was released

Answer

A chemical change happened because a color change occurred

Answer

A chemical change happened because a precipitate formed

Answer

A physical change happened because the vinegar boiled into a gas

Question 42

Which BEST explains why the total mass of the product(s) would be LESS than the total mass of the reactant(s) after a chemical reaction?

Accepted Answer

Gases were released into the air during the reaction

Answer

Precipitates were created during the reaction

Answer

Atoms involved in the reaction lost mass

Answer

A physical change has occurred

Question 43

A student mixed some food coloring into some water. Which of the following statements is true?

Accepted Answer

No chemical change happened because no new substance formed.

Answer

A chemical change happened because a new substance formed

Answer

A chemical change happened because a precipitate formed

Answer

No chemical change happened because the water changed phase

Question 44

In any chemical reaction, the total amount of matter before the reaction and the total amount of matter after the reaction must STAY THE SAME according to:

Accepted Answer

The Law of Conservation of Mass

Answer

The Law of Equality

Answer

The Law of Conservation of Energy

Answer

The Law of Balance

Question 45

17. What is a precipitate?

Accepted Answer

A solid that can be formed by combining two liquids

Answer

A change in temperature

Answer

A measuring tool

Answer

An element

Question 46

Which of the following shows ONE example of a physical change and ONE example of a chemical change?

Accepted Answer

Freezing water and burning coal

Answer

Dissolving powder and shredding paper

Answer

Rusting iron and baking a cake

Answer

Boiling water and melting wax

Question 47

Which of the following is responsible for a chemical change?

Accepted Answer

a chemical reaction

Answer

cooling down

Answer

crushing

Answer

melting

Question 48

Hand-warmers work by creating heat by creating a reaction between iron and oxygen. How do you know that a chemical reaction is happening without being able to see a new compound being formed?

Accepted Answer

There is a change in temperature

Answer

There is no chemical reaction happening

Answer

A precipitate is formed

Answer

There is a change in color

Question 49

Which of the following is an example of a physical change?

Accepted Answer

Melting ice into water

Answer

Iron rusting

Answer

Lithium reacting with water

Answer

Wood burning and releasing smoke

Question 50

Instant ice packs work by allowing ammonium nitrate to break down in water resulting in very cold products. How do you know a reaction has occurred?

Accepted Answer

A change in temperature

Answer

A gas has been released

Answer

A change in color

Answer

A precipitate has formed

Question 51

How are reactants and products different from one another?

Accepted Answer

Reactants are the ingredients that go into a reaction; products are the results that come out

Answer

Products are the ingredients that go into a reaction; reactants are the results that come out

Answer

Reactants and products are the same

Answer

There is no such thing as reactants and products

Question 52

Why is boiling water into water vapor a physical change and not a chemical change?

Accepted Answer

It is still water, so no new substance is made

Answer

The color changed making it invisible

Answer

Water boiling is actually a chemical change, not a physical change

Answer

Physical and chemical changes are the same thing

Question 53

Which of the following is a sign that a chemical change or a chemical reaction has taken place?

Accepted Answer

Bubbles form of a new gas being released

Answer

A liquid substance takes the form of its container

Answer

The substance boils while being heated

Answer

The substance condenses when cooled

Question 54

What is a PUSH or PULL of an object?

Accepted Answer

Force

Answer

Motion

Answer

Friction

Answer

Gravity

Question 55

A balanced force will cause an object to move.

Accepted Answer

false

Answer

true

Question 56

If there are two forces going in the SAME direction, you would ...?

Accepted Answer

(+) Add the forces

Answer

(-) Subtract the forces

Answer

Neither

Answer

(x) Multiply

Question 57

Forces that have a net force of Zero (0) are ______________.

Accepted Answer

Balanced force

Answer

Unbalanced force

Question 58

How will this object move?

Accepted Answer

It will move to the right.

Answer

It won't move.

Answer

It will move to the left.

Answer

It will move up.

Question 59

How will this object move?

Accepted Answer

It won't move.

Answer

It will move to the left.

Answer

It will move in both directions.

Answer

It will move to the right.

Question 60

What is the net force?

Accepted Answer

5 N left

Answer

30 N left

Answer

25 N right

Answer

55 N right

Question 61

What is the net force?

Accepted Answer

0 N

Answer

1000 N upward

Answer

500 N right

Answer

40 N right

Question 62

These forces are ______________

Accepted Answer

Unbalanced Force

Answer

Balanced Force

Question 63

What Is the Net Force?

Accepted Answer

0 N

Answer

10 N right

Answer

10 N left

Question 64

You and your dad are moving the couch from one side to another. Your dad pushes with a force of 35 N to the right and you push with a force of 25 N right. What is the net force on the couch?

Accepted Answer

60 N right

Answer

10 N left

Answer

60 n right

Answer

50 N left

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