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Chemical Reactions

Total questions: 60

Worksheet time: 32mins

Name
Class
Date
1.

Complete the sentence.


During a chemical reaction, atoms ________.


Completa la oración. Durante una reacción química, los átomos ________.

a)

can appear

b)

can disappear

c)

get rearranged

d)

stop moving and vibrating

2.

What always happens in a chemical reaction?


¿Qué sucede siempre en una reacción química?

a)

Some atoms of existing substances disappear.

b)

Some substances change phase.

c)

New atoms appear and form new substances.

d)

New substances form from atoms of existing substances.

3.

Identify the product(s) in the following chemical reaction:


Chromium oxide + Carbon → Chromium + Carbon monoxide

a)

Chromium and carbon.

b)

Chromium and carbon monoxide.

c)

Chromium and carbon dioxide.

d)

Chromium oxide and carbon.

4.

In chemical reactions, a product is _________.


En reacciones químicas, un producto es _________.

a)

any substance that is made of the greatest number of atoms

b)

any substance that is made from the least number of atoms

c)

any substance that is to the left of the arrow

d)

any substance to the right of the arrow

5.

What is the role of the arrow sign in a chemical reaction?


¿Cuál es el papel del signo de flecha en una reacción química?

a)

Making sure atom counts on each side are the same.

b)

Separating products and reactants.

c)

Showing which substances were in the container first and which substances were added later.

d)

Showing which substances are solids and which are liquids or gases.

6.

In a chemical reaction, the mass of the reactants is 200 grams. Which of the following could represent the mass of the products?

a)

26.6 grams.

b)

200 grams

c)

3.3 grams.

d)

2000 grams.

7.

Which of the following describes the law of conservation of mass?


¿Cuál de los siguientes describe la ley de conservación de la masa?

a)

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

b)

The mass of the products equals the mass of the reactants.

c)

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

d)

The products will have the same states of matter as the reactants.

8.

Complete the sentence.


During a chemical reaction, __________.

a)

a small amount of matter is destroyed during the process

b)

the mass of the atoms of the product(s) is greater than that of the reactant(s)

c)

a new substance(s) with the same number of atoms as the initial substance(s) is formed

d)

the number of atoms in the product(s) is less than that of the reactant(s)

9.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

10.

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

a)

water freezes to form ice

b)

sugar dissolves in water

c)

gasoline burns in a car engine

d)

a piece of metal expands when it is heated

11.

A change in the shape of an object is an example of _________________.

a)

a chemical change

b)

energy

c)

an endothermic change

d)

a physical change

12.
Which of the following is an example of a chemical change?
a)
rusting of a bicycle
b)
painting a house
c)
washing a dog
d)
tearing up a newspaper
13.

Which one shows that a chemical reaction has occurred?

a)

dissolving

b)

melting

c)

formation of a gas

d)

bending

14.
Which of the following IS a physical change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
15.
What type of change occurs when a new substance is formed that has different properties from the original substances?
a)
chemical change
b)
nuclear change
c)
physical change
d)
mutation
16.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
17.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
18.

What is the BEST definition of a chemical reaction?

a)

A change in matter that produces one or more NEW substances

b)

When two things combine and EXPLODE.

19.
True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 
a)
true
b)
false
20.
A chemical change is different than a physical change because in a chemical change
a)
Chemicals are used
b)
Molecules do not physically touch
c)
A new substance is formed and in a physical change no new substance is formed
d)
The change can be seen but in a physical change it cannot
21.
The left side of the equation below is called
a)
Products
b)
Reactants
22.
The right side of the equation below is called the
a)
products
b)
reactants
23.
_________ is (are) made of more than one atom.
a)
A molecule
b)
Protons
c)
Neutrons
d)
An element
24.
________ result(s) in no new substances.
a)
A physical change
b)
A chemical change
c)
Physical and chemical changes
d)
None of the above
25.
Which is an example of a physical change?
a)
Burning wood
b)
Freezing water
c)
Rust on a car
d)
Cooking food
26.
Which is an example of a chemical change?
a)
Burning wood
b)
Rust on a car
c)
Cooking food
d)
All of the above
27.
If you start a chemical reaction with 5 atoms of helium, how many atoms will you have after?
a)
4 atoms
b)
10 atoms
c)
1 atom
d)
5 atoms
28.
Which of the following are properties of matter?
a)
Magnetism
b)
Color
c)
Odor
d)
All of the above
29.

_____ is made of ONE type of material throughout.

a)

Substance

b)

Mixture

30.

Which is an example of a pure substance?

a)

Air

b)

Oxygen

31.

_____ is a blend of two or more materials.

a)

Substance

b)

Mixture

32.

Which is an example of a mixture?

a)

Air

b)

Oxygen

33.

Which is an example of a pure substance?

a)

Water

b)

Salt water

34.

Which is an example of a mixture?

a)

Water

b)

Salt Water

35.

Which is an example of a pure substance?

a)

Cookies

b)

Sugar

36.

Which is an example of a mixture?

a)

Cookies

b)

Sugar

37.

____ is when a solid separates into particles too small to see and it mixes completely in the liquid.

a)

Reacting

b)

Evaporating

c)

Dissolving

d)

Melting

38.

A substance is _____ if it can be dissolved in something else.

a)

soluble

b)

insoluble

39.

A substance is _____ if it CANNOT be dissolved in something else.

a)

soluble

b)

insoluble

40.

Which of these substances are SOLUBLE in water?

a)

Olive Oil

b)

Sugar

41.

Which of these substances are INSOLUBLE in water?

a)

Olive Oil

b)

Sugar

42.

Which of these substances are SOLUBLE in water?

a)

Baking Soda

b)

Butter

43.

Which of these substances are INSOLUBLE in water?

a)

Baking Soda

b)

Butter

44.

The amount of mass in a given space is called _____.

a)

Density

b)

Flammability

c)

Soluble

d)

Insoluble

45.

How a substance interacts with fire is called _____.

a)

Density

b)

Flammability

c)

Soluble

d)

Insoluble

46.

Substances that are LESS dense will _____.

a)

increase a flame

b)

sink

c)

float

d)

extinguish a flame

47.

Substances that are MORE dense will _____.

a)

increase a flame

b)

sink

c)

float

d)

extinguish a flame

48.

Substances that are highly flammable will _____.

a)

increase a flame

b)

sink

c)

float

d)

extinguish a flame

49.

Substances that are not flammable will _____.

a)

increase a flame

b)

sink

c)

float

d)

extinguish a flame

50.

The smallest particle of matter is called _____.

a)

atom

b)

periodic table of elements

c)

molecule

d)

substance

51.

Atoms are combined to form _____.

a)

atoms

b)

periodic table of elements

c)

molecules

d)

substances

52.

The _______ is a list of all the different atoms.

a)

atom

b)

periodic table of elements

c)

molecule

d)

substance

53.

Name this molecule:

a)

Water (H2O)

b)

Carbon Dioxide (CO2)

c)

Table Salt (NaCl)

d)

Oxygen Gas (O2)

54.

Name this molecule:

a)

Water (H2O)

b)

Carbon Dioxide (CO2)

c)

Table Salt (NaCl)

d)

Oxygen Gas (O2)

55.

Name this molecule:

a)

Water (H2O)

b)

Carbon Dioxide (CO2)

c)

Table Salt (NaCl)

d)

Oxygen Gas (O2)

56.

Name this molecule:

a)

Water (H2O)

b)

Carbon Dioxide (CO2)

c)

Table Salt (NaCl)

d)

Oxygen Gas (O2)

57.

Name this Atom: H

a)

Hydrogen

b)

Carbon

c)

Nitrogen

d)

Oxygen

58.

Name this Atom: C

a)

Hydrogen

b)

Carbon

c)

Nitrogen

d)

Oxygen

59.

Name this Atom: N

a)

Hydrogen

b)

Carbon

c)

Nitrogen

d)

Oxygen

60.

Name this Atom: O

a)

Hydrogen

b)

Carbon

c)

Nitrogen

d)

Oxygen

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