Quiz about Chemical Reaction

Question 1

How many Hydrogen are in 4H₂O?

Accepted Answer

8

Answer

6

Answer

2

Answer

4

Question 2

How many Oxygen are in H₂O?

Accepted Answer

1

Answer

2

Answer

0

Answer

4

Question 3

2H₂ + O₂ ----> 2H₂O What is the product?

Accepted Answer

2H2O

Answer

------>

Answer

2H₂+ O₂

Question 4

2H₂ + O₂--------> 2H₂O What are the reactants?

Accepted Answer

2H₂ +O₂

Answer

----->

Answer

2H2O

Question 5

How many Magnesium are in 10MgCl₂?

Accepted Answer

10

Answer

5

Answer

20

Question 6

How many elements are in C₆H₁₂O₆?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 7

How many atoms are there TOTAL in:
H₂SO₄

Accepted Answer

7

Answer

6

Answer

5

Answer

3

Question 8

(Element or Compound)
C₂H₈O

Accepted Answer

Compound

Answer

Element

Answer

Letters

Answer

Numbers

Question 9

How many Elements are in the compound C₂H₈O ?

Accepted Answer

3

Answer

2

Answer

1

Answer

0

Question 10

A capital letter or combination of a capital letter and a small letter that is used to represent an element is called a(n) ________

Accepted Answer

chemical symbol

Answer

abbreviation

Question 11

A subscript is the small number below and to the right of a(n) ________ that tells the number of _______ of that element.

Accepted Answer

element symbol; atoms

Answer

atom; element symbol

Answer

subscript; protons

Answer

compound; elements

Question 12

Which equation obeys the law of conservation of mass?

Accepted Answer

C + 2H₂ ----> CH₄

Answer

H₂ + O₂ ------> H₂0

Answer

2Fe₂O₃ ------> 2O₂ + 4Fe

Question 13

The law of conservation of matter states that

Accepted Answer

atoms are neither created nor destroyed in chemical reactions.

Answer

chemical reactions change matter.

Answer

it is mandatory that you recycle.

Answer

a chemical equation can be balanced or unbalanced.

Question 14

If there is no subscript by an element in a chemical formula, how many atoms of that element are there?

Accepted Answer

only 1

Answer

0

Answer

2

Answer

1 million

Question 15

How many elements are present in this compound?
Mg₂As₃COHNi₂

Accepted Answer

6

Answer

2

Answer

4

Answer

10

Question 16

Which side of a chemical equation is the reactant side?

Accepted Answer

Left (before the yields sign)

Answer

Right (after the yields sign)

Question 17

Which side of a chemical equation os the product side?

Accepted Answer

Right (after the yields sign)

Answer

Left (before the yields sign)

Question 18

Which problem is balanced?

Accepted Answer

2Na + 2H₂O --> 2NaOH + H₂

Answer

PbO₂ + 2H₂

Answer

SO₂ + H₂0 --> H₂SO₄

Question 19

What is a coefficient?

Accepted Answer

The large number to the left of a formula.

Answer

The small number on the right of the chemical symbol.

Question 20

Is the equation balanced?: 2H₂O + O₂ --> 4MgO + 3Fe

Accepted Answer

No

Answer

Yes

Question 21

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 22

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 23

Students react baking soda & vinegar.
Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?

Accepted Answer

The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.

Answer

Bubbles were produced during the reaction, which meant that a gas was being produced.

Answer

The plastic bag did not change in any way, indicating that it was not involved in the reaction.

Answer

The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.

Question 24

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.

Accepted Answer

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

Answer

His chemical reaction defied the law of conservation of mass

Answer

The product destroyed mass during the reaction

Answer

The reactants created matter during the reaction

Question 25

A chemical reaction is balanced when

Accepted Answer

Both sides have the same number and type of atoms

Answer

both sides have the same elements

Answer

Same subscripts

Answer

Same coefficients

Question 26

The big number in front of a chemical formula is a __________ and it tells us the number of __________ present in that formula

Accepted Answer

Coefficient; Molecules

Answer

Subscript; Atoms

Answer

Superscript;Molecules

Answer

Charge;Atoms

Question 27

The number to the lower-right side of an element is a

Accepted Answer

Subscript

Answer

Superscript

Answer

Coefficient

Answer

Charge

Question 28

How many nitrogen atoms does NH₃ have?

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 29

How many oxygen atoms are in this chemical formula?

Accepted Answer

6 oxygen atoms

Answer

2 oxygen atoms

Answer

3 oxygen atoms

Answer

4 oxygen atoms

Question 30

Mass cannot be created or__________ during a chemical reaction?

Accepted Answer

Destroyed

Answer

Reacted

Answer

Transferred

Answer

Born

Question 31

Which compounds are the PRODUCTS of this reaction?

Accepted Answer

CO₂ + H₂O

Answer

C₆H₁₂O₆ + O₂

Answer

C₆H₁₂O₆+ CO₂

Answer

H₂O + O₂

Question 32

Which compounds are the REACTANTS of this reaction?

Accepted Answer

C₆H₁₂O₆ + O₂

Answer

CO₂ + H₂O

Answer

C₆H₁₂O₆+ CO₂

Answer

H₂O + O₂

Question 33

How many different elements are in the REACTANTS side of this balanced equation?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 34

2Al₂O₃is on the ____________ side of this equation.

Accepted Answer

Products

Answer

Reactants

Question 35

Evidence of a chemical reactions is anything that shows -

Accepted Answer

a new substance has formed

Answer

a solid dissolved in a liquid

Answer

interaction between 2 gases

Answer

a change in the state of matter

Question 36

One of the signs of a chemical reaction taking place is:

Accepted Answer

Bubbles are produced

Answer

Reactants are not combining

Answer

Products are not forming

Answer

Color is not changing

Question 37

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 38

Which is NOT an indication of a chemical change?

Accepted Answer

shape change

Answer

temperature change

Answer

formation of a precipitate

Answer

production of light

Question 39

A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?

Accepted Answer

A yellow solid forms and then settles to the bottom of the beaker.

Answer

The level of the substance in the beaker is higher after the other liquid is added.

Answer

Small white crystals are left behind in the flask that held the first liquid.

Answer

The mass of the combined liquids is greater than either original liquid.

Question 40

Which of the following is an example that includes evidence of a chemical reaction?

Accepted Answer

Sugar that is burned gives off an odor and turns brown and then black.

Answer

A sample of zinc is placed in water and it settles to the bottom

Answer

A solid block of ice is heated and it completely melts into a liquid.

Answer

A tomato is placed into a blender and chopped up into smaller pieces.

Question 41

In a container, a solid consisting of clear crystals is combined with a blue liquid and the following observations are obtained: How many of the listed observations indicate a new substance was formed?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 42

What type of change do we see in when we melt ice?

Accepted Answer

Physical Change

Answer

Chemical Change

Question 43

A physical change is?

Accepted Answer

Objects or substances undergo a change that does not change their chemical composition

Answer

It changes the object into something different

Answer

it is just like a chemical reaction

Answer

Paper burning

Question 44

Which evidence demonstrates that a chemical change has occurred.

Accepted Answer

gas is produced (bubbles)

Answer

water level rises

Answer

water becomes cloudy

Answer

tablet dissolves

Question 45

Sugar is dissolved into Kool Aid. What type of change is this?

Accepted Answer

Physical

Answer

Chemical

Answer

Multi

Answer

Asystematic

Question 46

What is the evidence of the chemical change seen here?

Accepted Answer

Light produced

Answer

Color change

Answer

state change

Answer

mixture

Question 47

What is the difference between a physical change and a chemical change?

Accepted Answer

In a chemical change, the composition of matter changes; in a physical change, it does not.

Answer

In a physical change, the state of matter may change; in a chemical change it does not.

Answer

In a physical change, the color may change; in a chemical change, it does not.

Answer

In a physical change, the composition of matter changes; in a chemical change, it does not.

Question 48

Dissolving salt in water is an example of a _____.

Accepted Answer

physical change

Answer

chemical change

Question 49

A piece of wood burning is an example of

Accepted Answer

Chemical change

Answer

Physical change

Answer

Niether

Question 50

A change where one or more new substances are created.

Accepted Answer

Chemical Change

Answer

Physical Change

Question 51

A pot of water is boiled to make noodles, this is an example of

Accepted Answer

Physical change

Answer

Chemical change

Answer

Niether

Question 52

If the atomic bonds in the reactants are broken, a chemical reaction has occurred.

Accepted Answer

True

Answer

False

Question 53

Which of the following characteristics is shared by all chemical reactions?

Accepted Answer

Form new substances

Answer

Produce a precipitate

Answer

Show a color change

Answer

Release heat energy

Question 54

Metal interacting with the oxygen in the air can cause rust. Rust is an example of what kind of change?

Accepted Answer

Chemical

Answer

Physical

Question 55

Which is an example of a physical property?

Accepted Answer

state of matter

Answer

ability to react with acid

Answer

flammability

Answer

ability to react with oxygen

Question 56

How many Hydrogen atoms are in this chemical formula?

8Fe(H₂O)₄(OH)₂

Accepted Answer

80

Answer

16

Answer

64

Answer

72

Question 57

How does the Law of Conservation of Mass apply to chemical reactions?

Accepted Answer

The reactants and products must have exactly the same number and type of atoms.

Answer

The reactants must have fewer atoms than the products.

Answer

The products must have twice as many atoms as the reactants.

Answer

The reactants and products must have close to the same number and type of atoms.

Question 58

Which of these is evidence of a chemical change?

Accepted Answer

All of these are evidence of a chemical change.

Answer

Change of color

Answer

Change of temperature

Answer

Formation of a gas (bubbles)

Answer

Formation of a precipitate (solid)

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