Quiz about Balancing chemical equations

Question 1

How many elements are in C₆H₁₂O₆?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 2

How many atoms of carbon (C) are in C₆H₁₂O₆?

Accepted Answer

6

Answer

3

Answer

12

Answer

24

Question 3

Element or compound?
H₂O

Accepted Answer

compound

Answer

element

Question 4

Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)

Accepted Answer

H3SO4

Answer

HSO4

Answer

H4S3O

Answer

H2O

Question 5

How many elements are in H₂O?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 6

How many atoms are there TOTAL in:
H₂SO₄

Accepted Answer

7

Answer

6

Answer

5

Answer

3

Question 7

The red numbers in the image below represent ________

Accepted Answer

coefficients

Answer

subscripts

Answer

I don't know, and don't want to try

Answer

None of the answers are correct

Question 8

The blue numbers in the image below represent ________

Accepted Answer

subscripts

Answer

I don't know, and don't want to try

Answer

coefficients

Answer

none of the answers are correct

Question 9

The substances at the beginning of a chemical equation are called the ____

Accepted Answer

reactants

Answer

product

Answer

yield

Answer

chemical symbol

Question 10

In a chemical reaction, everything to the rightof the arrow is called ______________.

Accepted Answer

Products

Answer

Yields

Answer

Molecules

Answer

Reactants

Question 11

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂--> 2Al₂O₃

Accepted Answer

4

Answer

2

Answer

6

Answer

1

Question 12

What is the left part of a chemical equation called?
2H_{2 +}O₂ --> 2H₂O

Accepted Answer

Reactants

Answer

Products

Answer

Yields

Answer

Chemical Equation

Question 13

What is the right part of a chemical equation called...
2H_{2 +}O₂ --> 2H₂O

Accepted Answer

Products

Answer

Reactants

Answer

Yields

Answer

Chemical Equation

Question 14

Is the following equation balanced?
4Fe + 3O₂ --> 2Fe₂O₃

Accepted Answer

yes

Answer

no

Question 15

Is the following reaction balanced?
NaHCO₃ --> Na₂CO₃ + H₂O + CO₂

Accepted Answer

no

Answer

yes

Question 16

Chemical Reaction

Accepted Answer

when chemical bonds are broken, atoms are rearranged, and bonds are reformed to make a new substance

Answer

what comes out of a chemical reaction

RIGHT SIDE of a chemical equation

Answer

smallest unit of an element

Answer

two or more atoms combined

Question 17

Chemical Equation

Accepted Answer

Written version of a chemical reaction

Answer

what go into a chemical reaction

LEFT side of chemical equation

Answer

means "and"

Answer

smallest unit of an element

Question 18

Products

Accepted Answer

What comes out of a chemical reaction

RIGHT side of the chemical equation

Answer

written version of a chemical reaction

Answer

means "yield" (makes)

Answer

means "add"

Question 19

Reactants

Accepted Answer

What go into a chemical reaction

LEFT Side of the chemical equation

Answer

means "add"

Answer

what comes out of a chemical reaction

RIGHT side of the chemical equation

Answer

smallest unit of an element

Question 20

Arrow

Accepted Answer

means "yield" (makes)

Answer

means "add"

Answer

Smallest unit of an element

Answer

LARGE number in front of a molecule or atom

Tells how many molecules

Question 21

Coefficient

Accepted Answer

LARGE number in front of a molecule or atom

Tells how many molecules

Answer

when products and reactants are equal

Answer

two or more atoms combined

Answer

written version of a chemical reaction

Question 22

Subscript

Accepted Answer

SMALL number behind atom

Tells how many of each atom

Answer

Smallest unit of an element

Answer

LARGE number in front of a molecule or atom

Tells how many molecules

Answer

two or more atoms combined

Question 23

Atom

Accepted Answer

smallest unit of an element

Answer

when products equal reactants

Answer

two or more atoms combined

Answer

LARGE number in front of a molecule or atom

Tells how many molecules

Question 24

Molecule

Accepted Answer

two or more atoms combined

Answer

smallest unit of an element

Answer

when products and reactants are equal

Answer

means "add"

Question 25

True or False: When balancing chemical equations the subscripts can change.

Accepted Answer

false

Answer

true

Question 26

Why is the following chemical equation not balanced?
H_{2 +}O₂--> H₂O

Accepted Answer

each side of the equation has a different number of oxygen atoms

Answer

each side of the equation has a different number of hydrogen atoms

Answer

each side has the same mass

Question 27

In chemical reactions, what does the principle of conservation of mass mean?

Accepted Answer

Matter is not created or destroyed.

Answer

The total mass of the reactants is greater than the total mass of the products.

Answer

Matter is not changed.

Answer

The total mass of the reactants is less than the total mass of the products.

Question 28

Which of the following is a balanced chemical equation?

Accepted Answer

2Fe₂O₃ + 3C --> 4Fe + 3CO₂

Answer

2Mg + HCl --> MgCl₂+ H₂

Answer

H₂O₂ --> H₂O + O₂

Answer

SO₂+ O₂+ 2H₂O --> 4H₂SO₄

Question 29

Which of the following describes a precipitate?

Accepted Answer

a solid forms when one liquid is poured into another

Answer

a liquid forms when a block of metal is heated

Answer

a gas forms when a solid is placed in a liquid

Answer

bubbles form when an acid is poured on a rock

Question 30

Which of the following is an example of synthesis?

Accepted Answer

SO₃ + H₂O--> H₂SO₄

Answer

KClO₃--> KCl + O₂

Answer

HgO + Cl₂-->HgCl + O₂

Answer

Cl₂ + NaBr --> NaCl + Br₂

Question 31

In a _________________ reaction, two or more substances are formed when one compound breaks down.

Accepted Answer

decomposition

Answer

combustion

Answer

double replacement

Answer

sythesis

Question 32

What is something that occurs when two substances are mixed together and transform into a third substance.

Accepted Answer

chemical reaction

Answer

voodoo

Answer

velocity

Answer

gravity

Question 33

Which compound contains the greatest number of elements?

Accepted Answer

C₈H₁₀N₄O₂

Answer

5CH4

Answer

Fe2O3

Answer

C₆H₁₂O₆

Question 34

Is Slime a Substance made using a chemical reaction?

Accepted Answer

Yes

Answer

No

Question 35

In a ___________change, a substance changes into a different substance.

Accepted Answer

Chemical

Answer

Physical

Question 36

Which of the following IS a physical change?

Accepted Answer

Getting a haircut

Answer

Rusty Metal

Answer

Sourmilk

Answer

A compound

Question 37

Ca + O₂ --> CaO

Is this reaction balanced?

Accepted Answer

No

Answer

Yes

Answer

Maybe

Question 38

N₂ + H₂ --> NH₃

Is this reaction balanced?

Accepted Answer

No

Answer

Yes

Answer

Maybe

Question 39

2 Mg + O₂ --> 2 MgO

Is this reaction balanced?

Accepted Answer

Yes

Answer

No

Answer

Maybe

Question 40

After you mix two substances together, a new substance forms. This is an example of:

Accepted Answer

Chemical Change

Answer

Physical Change

Question 41

Sugar dissolves in water.  This is an example of....

Accepted Answer

Physical Change

Answer

Chemical Change

Question 42

If a chemical reaction is EXOTHERMIC, the temperature would....

Accepted Answer

Increase

Answer

Stay the same

Answer

Decrease

Question 43

Which of the following is a sign that a chemical reaction has occurred?

Accepted Answer

bubbles of gas appear

Answer

change in shape

Answer

melting

Answer

dissolving

Question 44

When you freeze water, it turns to ice.  What kind of change is this?

Accepted Answer

Physical

Answer

Chemical

Question 45

In an endothermic reaction the system is releasing energy.

Accepted Answer

False

Answer

True

Question 46

What type of reaction occurs in a hand warmer

Accepted Answer

exothermic

Answer

endothermic

Question 47

Are fireworks exploding a physical or chemical change?

Accepted Answer

chemical

Answer

phyiscal

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