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Chemistry End of unit test 1

Total questions: 72

Worksheet time: 6hrs 0mins

Name
Class
Date
1.

What is at the center of every atom?

a)

nuclear

b)

nucleus

c)

electron

d)

molecule

2.

An electron of an atom...

a)

lives inside the nucleus and has a neutral charge.

b)

circles the nucleus and has a positive charge.

c)

lives inside the nucleus and has a negative charge.

d)

circles the nucleus and has a negative charge.

3.

The number of protons in an atom is equal to the number of _ .

(a)  

4.

What is a compound?

a)

A molecule that is formed from two different elements/atoms.

b)

A molecule that is formed from two or more of the same element/atom.

c)

A tiny atom that makes up an atom.

d)

The center of an atom that is formed by neutrons. protons, and electrons.

5.

Which of the following cannot be broken down into something simpler?

a)

a compound

b)

an element

c)

a chemical formula

d)

a mixture

6.

The following can be found on the Periodic Elements...

a)

The number of atoms in a carbon dioxide molecule.

b)

All the compounds that exist in the natural world.

c)

The chemical formula for water.

d)

All the elements that have been discovered or created in a lab.

7.

A subscript...

a)

the number of protons in an atom.

b)

the number of molecules present.

c)

shows the number of atoms of a specific element in a compound.

d)

the number an element is on the periodic table.

8.

In order for a compound to form, a _ reaction must occur.

(a)  

9.

If a compound has 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms, its chemical formula must be...

a)

12C22H11O

b)

  C12H22O11C_{12}H_{22}O_{11}  

c)

C11H22O12C_{11}H_{22}O_{12}  

d)

2C11H22O122C_{11}H_{22}O_{12}  

10.

What is the Periodic Table?

a)

A chart that shows all the elements scientists have discovered/created.

b)

A chart that lists all the molecules that exist in the universe.

c)

A chart that tells who discovered each element.

d)

A chart that lists all the molecules found in nature.

11.

The atomic number of an element represents the number of _ in an atom.

(a)  

12.

What element has the symbol Al

a)

Argon

b)

Aluminium

c)

Silver

d)

Gold

13.

What is the symbol for Magnesium

a)

Mn

b)

Mc

c)

Mg

d)

Md

14.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
15.
How does the size of a proton compare to the size of a neutron?
a)
larger
b)
smaller
c)
equal
16.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
17.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
18.
Name this compound: H2O
a)
Water
b)
Carbon dioxide
c)
Hydrogen peroxide 
d)
Sulfuric acid
19.
What is sugar?
a)
element
b)
compound
c)
mixture
20.
N2, Cl2, and O2 are all 
a)
diatomic molecules.
b)
ionic bonds.
c)
of equal mass.
d)
solids.
21.
Chlorine, bromine, fluorine, and iodine are all 
a)
nonmetals and good conductors.
b)
nonmetals and halogen gases.
c)
metals and bad conductors.
d)
metals and malleable.
22.

Which of the following choice sequences that parts of matter from smallest to largest.

a)

Element -> Compound -> Atom

b)

Element -> Atom -> Compound

c)

Atom -> Compound -> Element

d)

Atom -> Element -> Compound

23.
Carbon is considered an element while carbon dioxide is considered a compound. This is because carbon dioxide is –
a)
a gas at room temperature.
b)
made of two different elements.
c)
given off by green plants.
24.
A candle wick burning is an example of a _________________________
a)
physical reaction
b)
condensation
c)
neutrons
d)
chemical reaction
25.

Which of the following IS a physical change?

a)

Getting a haircut

b)

Rusty metal

c)

A compound

d)

sour milk

26.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
27.

6CO2+ 6H2O → C6H12O6 + 6O26CO_2+\ 6H_2O\ \rightarrow\ C_6H_{12}O_{6\ }+\ 6O_2  

What is this chemical reaction?

a)

Corrosion

b)

Photosynthesis

c)

Combustion

28.

Which is correct?

a)

iron and sulfur are both metals

b)

iron and sulfur are both non metals

c)

iron is a non metal and sulfur is a metal

d)

iron is a metal and sulfur is a non metal

29.

What is the correct name for CO?

a)

carbon dioxide

b)

carbon monoxide

c)

cobalt

d)

carbon oxide

30.

Which elements are present in H2SO4?

a)

hydrogen and oxygen

b)

hydrogen, oxygen and sodium

c)

hydrogen, oxygen and sulfur

d)

hydrogen, oxygen and silicon

31.

True or false: Hydrogen atoms go around in pairs called molecules

a)

True

b)

False

32.

A property of sodium is that it fizzes when it reacts with water. What is a property of chlorine?

a)

It is an orange liquid at room temperature

b)

It is a green gas at room temperature

c)

It is a black solid at room temperature

d)

It is a colourless gas at room temperature

33.

What is the difference between a molecule and a compound?

a)

One is radioactive.

b)

Molecules are made of the same atoms, while compounds are made up of two or more different types of atoms.

c)

They are both made of only a single atom.

d)

One makes you up and the other makes the thing that make you up.

34.

Why are oxygen molecules (O2) different than ozone molecules (O3) even though they are made up of the same atoms.

a)

They have different structures.

b)

They have different amounts of atoms.

c)

They have different chemical formulas.

d)

All of the above answers are correct.

35.

Which of the characteristics of metals we use to create objects, tools of various shapes etc.

a)

Specyfic colour

b)

Malleability and ductility

c)

High boiling point

d)

Metallic shine

36.

Animal bones are made mainly of carbonate and phosphate of a certain chemical element. Which element is it?

a)

calcium

b)

sodium

c)

potasium

d)

iron

37.

Negative is the charge for _____.

a)

protons

b)

neutrons

c)

electrons

38.

How would you show that there is two silicon and 1 magnesium?

a)

Si2Mg

b)

Mg2Si

c)

2SiMg

d)

2mgSi

e)

2 tacos

39.

What two meanings defines an element as a metal?

a)

Conducts heat and electricity

b)

It is Shiny and melts at over 1000 degrees celcius

c)

It is gold and easily scratched

d)

It is a solid

e)

Taco

40.

On which side of the periodic table are the non-metals?

a)

Left

b)

Right

c)

Middle

d)

Taco

41.

A pure substance composed of the same type of atom throughout.

a)

Compound

b)

Element

c)

Mass

d)

Periodic Table

42.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
43.
What type of reaction is this?  
__H2O2 ---->  __H2O + O2
a)
Synthesis
b)
Decomposition 
c)
Single Replacement
d)
Combustion 
44.

Balance this equation: _Zn + _O2 --> _ZnO

a)

1, 1, 2

b)

2, 1, 2

c)

1, 1, 1

d)

2 ,2, 2

45.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
46.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
47.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
48.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
49.

O2(g) + 2 H2 (g) → 2 H2O (g) + EnergyO_2\left(g\right)\ +\ 2\ H_2\ \left(g\right)\ \rightarrow\ 2\ H_2O\ \left(g\right)\ +\ Energy  

a)

endothermic

b)

exothermic

50.
Translate the following word equation: 
Liquid nitrogen and oxygen gas combine to form nitrogen monoxide gas. 
a)
N + O → NO
b)
N2 + O2 → N2O2
c)
N2(l) + O2(g) → NO(g)
d)
N(l) + O2(g) → NO(g)
51.
A precipitate is...
a)
a solid that falls out of a liquid solution
b)
a reactant in a reaction
c)
a clear substance
d)
the mass of a product
52.

Why are chemical equations always balanced? Select ALL that apply.

a)

Matter cannot be created.

b)

Matter cannot be destroyed.

c)

Matter can only be rearranged/conserved.

d)

Matter doesn't matter.

53.
In this image, what are the information in red is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
d)
Coefficient
54.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
55.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
a)
balanced
b)
unbalanced
56.
How many oxygen atoms are present in the following? 
4Ca(OH)2
a)
4
b)
6
c)
8
d)
1
57.
What is changed in a chemical reaction like this one? 
NaOH + HCl   →  NaCl + H2O
a)
the number of atoms is changed
b)
molecules and compounds are changed 
c)
atoms are changed
d)
elements are changed 
58.
Which of the following is true? 
a)
Na is a gas
b)
Cl combusts when put in water
c)
NaCl is very different than Na and Cl
d)
Cl is a metal
59.

The mass of the reactants must

a)

Be greater than the mass of the products

b)

Be less than the mass of the products

c)

are unmeasurable

d)

Be the exact same as the mass of the products

60.

What is the subscript on the product hydrogen (H)?

a)

2

b)

3

c)

12

d)

6

61.

When silver metal comes in contact with sulfur, silver sulfide forms and the silver appears darker. This is a...

a)

 change of form

b)

chemical change

c)

 change of state

d)

physical change

62.

A solid brown metal is added to a clear acidic solution. A white powder appears and the acid solution becomes cloudy. Which type(s) of change have/has occurred?

a)

both chemical and physical

b)

only physical

c)

 neither chemical nor physical

d)

only chemical

63.

Which of the following would be a Chemical Property?

a)

Size

b)

Flammability

c)

Color

d)

Density

64.
Solubility (dissolves): Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
65.

What is a physical property of these strawberries?

a)

Red

b)

Rotten

c)

Flammable

66.

Is an ice cream cone melting a physical or chemical change?

a)

Physical

b)

Chemical

67.

Chemical name for magnesium hydroxide is :

(a)  

68.

Match the following

a)

i-b;ii-d;iii-e;iv-c;v-a

b)

i-b;ii-d;iii-c;iv-a;v-e

c)

i-b;ii-d;iii-e;iv-a;v-c

d)

i-d;ii-b;iii-e;iv-a;v-c

69.
A change in phase ...
a)
Chemical Change
b)
Physical Change
70.
Causes a change in temperature ...
a)
Chemical Reaction
b)
Physical Reaction
71.

Why should a magnesium ribbon be cleaned before burning?

4 lines
72.

Define catalyst with example.

4 lines

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