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Distrcit Assessment Review

Total questions: 63

Worksheet time: 3hrs 9mins

Name
Class
Date
1.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
2.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
3.
What cannot be broken down into other substances?
a)
Compound
b)
Mixture
c)
Solids
d)
Element
4.
What is made up two or more elements that are chemically combined?
a)
Element
b)
Mixture
c)
Compound
d)
Solids
5.
Element or Compound?
NiSO4
a)
Element
b)
Compound
6.
Element or Compound?
Oxygen
a)
Element
b)
Compound
7.
Element or Compound?
Salt (NaCl)
a)
Element
b)
Compound
8.
Element or Compound?
As
a)
Element
b)
Compound
9.

Element or Compound?

One capital letter

a)

Element

b)

Compound

10.

Element or Compound?

2 or more capital letters

a)

Element

b)

Compound

11.

How many elements?

He3

a)

1

b)

2

c)

3

d)

4

12.

What is the difference between CO and Co?

a)

They are the same.

b)

CO is an element and Co is a compound.

c)

CO is a compound and Co is an element.

13.

Carbon (C) is considered an element while Carbon Dioxide (CO2) is considered a compound. That is because Carbon Dioxide is -

a)

a gas

b)

made of two elements

c)

given off by plants

d)

useful to us

14.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
15.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
16.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
17.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
18.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
19.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
20.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
21.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
22.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
23.
A subscript is the small number below a(n) ________ that tells the number of _______ of that element.
a)
element symbol; atoms
b)
atom; element symbol
c)
subscript; protons
d)
compound; elements
24.
A change in which NEW substances are formed.
a)
Chemical change
b)
Physical change
c)
Casual change
d)
Formal change
25.
Which of the following is NOT an example of chemical change?
a)
sour milk
b)
burning wood
c)
breaking a pencil
d)
rust
26.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
27.
Ripping up paper ...
a)
Chemical Change
b)
Physical Change
28.
An explosion occurs ...
a)
Chemical Change
b)
Physical Change
29.

What happens when a substance undergoes a physical change?

a)

Some physical properties change, but the substance keeps its identity.

b)

No physical properties change, and the substance keeps its identity.

c)

Some physical properties change, and the substance changes its identity.

d)

No physical properties change, but the substance changes its identity.

30.

What is an example of a physical change?

a)

having less ash than the paper that was burned to form it

b)

ice forming and then melting back into water

c)

rust having a different identity than the iron it forms on

d)

the irreversible reaction of vinegar and baking soda

31.
True or False: a physical change may produce a new substance.
a)
True
b)
False
32.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
33.
Is glass breaking a chemical or phyiscal change?
a)
chemical
b)
physical
34.

Which of the following options provides evidence of a CHEMICAL change?

a)

Wood is burned releasing ash and smoke

b)

Rocks separate when soil is sifted

c)

Water turns to ice when you put it in the freezer

d)

Salt dissolves in water

35.

 

Which is an example of a physical

change?

a)

a candle burning

b)

baking a cake

c)

evaporating water

d)

metal rusting

36.

Mowing the lawn is an example of

a)

Chemical Change

b)

Physical Change

c)

No Change

37.
The substance being dissolved in a solution.
a)
sands
b)
solute
c)
solvent
d)
alloy
38.
The substance in which a solute is dissolved
a)
sands
b)
solvent
c)
alloy
d)
negative particles
39.
A solution is a ___________mixture.
a)
heterogeneous
b)
homogeneous
c)
concentration
d)
ionic
40.
Solutions are composed of __________ .
a)
salts and solutes
b)
solvents and salts
c)
solutes and alloys
d)
solutes and solvents
41.
When water is added to a solution it is called a ______________
a)
dilution
b)
concentration
c)
heterogeneous solution
d)
dissociation
42.

You can make a solution more concentrated by adding more __________.

a)
solute
b)
solvent
c)
water
d)

solution

43.

In a sample of salt water, NaCl (salt) would be considered the ______.

a)
Solution
b)
Solute
c)
Solvent
d)
Solvation
44.
When one of the parts of the solution is water we call it _________. 
a)
water stuff 
b)
water mixture 
c)
aqua-man
d)
aqueous 
45.
If we are making Kool-aid with sugar, Kool-aid powder, and water, which part is the solvent?
a)
water
b)
powder
c)
sugar
d)
powder and sugar
46.
When one of the parts of the solution is water we call it _________. 
a)
water stuff 
b)
water mixture 
c)
aqua-man
d)
aqueous 
47.

You can make a solution more concentrated by adding more __________.

a)
solute
b)
solvent
c)
water
d)

solution

48.

Avery is conducting a science experiment. When water is added to a solution it is called a ______________

a)

dilution

b)

concentration

c)

heterogeneous solution

d)

dissociation

49.
Solutions are composed of __________ .
a)
salts and solutes
b)
solvents and salts
c)
solutes and alloys
d)
solutes and solvents
50.

In a science experiment, Avery dissolved sugar in water. What is the substance in which the sugar is dissolved?

a)

sands

b)

solvent

c)

alloy

d)

negative particles

51.

Aria is making lemonade. She adds sugar to the water. The sugar is a

a)

solute

b)

solution

c)

science

52.

What are the factors that affect the rate of dissolution?

a)

pH, viscosity, and conductivity

b)

Time, density, and mass

c)

Temperature, surface area, agitation, concentration, and the nature of the solute and solvent.

d)

Pressure, color, and volume

53.

How does temperature affect the rate of dissolution?

a)

Temperature affects the rate of dissolution by increasing or decreasing the kinetic energy of the solvent molecules, which affects the frequency of collisions with the solute.

b)

Temperature decreases the frequency of collisions between solvent and solute

c)

Temperature only affects the solute, not the solvent

d)

Temperature has no effect on the rate of dissolution

54.

Explain the effect of surface area on the rate of dissolution.

a)

Surface area has no effect on the rate of dissolution.

b)

The rate of dissolution decreases with an increase in surface area.

c)

The rate of dissolution increases with an increase in surface area.

d)

The rate of dissolution remains constant regardless of surface area.

55.

What is the impact of stirring on the rate of dissolution?

a)

Stirring causes the substance to solidify instead of dissolve.

b)

Stirring decreases the rate of dissolution.

c)

Stirring increases the rate of dissolution.

d)

Stirring has no impact on the rate of dissolution.

56.

Define solubility and explain its relationship with the rate of dissolution.

a)

Solubility is the ability of a substance to solidify in a solvent, while the rate of dissolution refers to how quickly a solute solidifies in a solvent.

b)

Solubility is the ability of a substance to dissolve in a solvent, while the rate of dissolution refers to how quickly a solute dissolves in a solvent.

c)

Solubility is the ability of a substance to evaporate in a solvent, while the rate of dissolution refers to how quickly a solute evaporates in a solvent.

d)

Solubility is the ability of a substance to condense in a solvent, while the rate of dissolution refers to how quickly a solute condenses in a solvent.

57.

Which factor has the greatest influence on the rate of dissolution: temperature, surface area, or stirring? Justify your answer.

a)

Humidity

b)

Temperature

c)

Pressure

d)

Color

58.

What happens to the rate of dissolution when the temperature is increased? Why?

a)

The rate of dissolution is not affected by temperature.

b)

The rate of dissolution decreases when the temperature is increased.

c)

The rate of dissolution remains the same when the temperature is increased.

d)

The rate of dissolution increases when the temperature is increased.

59.

How does increasing the surface area of a solute affect the rate of dissolution? Provide an example.

a)

Increasing the surface area of a solute only affects the color of the solution.

b)

Increasing the surface area of a solute has no effect on the rate of dissolution.

c)

Increasing the surface area of a solute increases the rate of dissolution.

d)

Increasing the surface area of a solute decreases the rate of dissolution.

60.

Why does stirring increase the rate of dissolution? Explain with a suitable example.

a)

Stirring increases the rate of dissolution by adding more solute to the solvent.

b)

Stirring increases the rate of dissolution by decreasing the contact between the solute and the solvent.

c)

Stirring increases the rate of dissolution by increasing the contact between the solute and the solvent.

d)

Stirring increases the rate of dissolution by changing the temperature of the solvent.

61.

How does the solubility of a substance affect its rate of dissolution? Provide an example.

a)

The solubility of a substance directly affects its rate of dissolution. The more soluble a substance is, the faster it will dissolve.

b)

The rate of dissolution is determined by the color of the substance

c)

The less soluble a substance is, the faster it will dissolve

d)

The solubility of a substance has no effect on its rate of dissolution

62.

What is the impact of temperature on the rate of dissolution? Explain with an example.

a)

The rate of dissolution decreases with an increase in temperature.

b)

The rate of dissolution increases with an increase in temperature.

c)

Temperature has no impact on the rate of dissolution.

d)

The rate of dissolution remains constant with an increase in temperature.

63.

How does agitation affect the rate of dissolution? Provide a suitable example.

a)

Agitation has no effect on the rate of dissolution.

b)

Agitation decreases the rate of dissolution by reducing the surface area of the solute that is exposed to the solvent.

c)

Agitation increases the rate of dissolution by increasing the surface area of the solute that is exposed to the solvent.

d)

Agitation causes the solute to solidify and prevents dissolution.

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