WorksheetsScience 7 Review
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
What is the difference between pure substances and mixture?
a)
A mixture is always heterogeneous while a pure substance is always homogeneous.
b)
A sample of mixture may have two or more phases (heterogeneous) while pure substance always has a uniform phase.
c)
The boiling point of a pure substance may vary while the boiling point of a mixture is constant.
d)
Pure substances can be separated physically while mixtures can't be.
2.
Which of the following is a heterogeneous mixture?
a)
sand in water
b)
mango shake
c)
coffee grounds
d)
salt and water solution
3.
How many significant figure are present in 0.000 560 400 miles?
a)
4 SF
b)
6SF
c)
8SF
d)
9SF
4.
Which of the following is an extensive property?
a)
My hair is longer now than the past few months.
b)
My hair color is black.
c)
My hair is shiny.
d)
My hair smells sweet.
5.
Your group is assigned to measure the length of a block of wood. Your individual measured values are 10 cm, 10.5 cm, 9.90 cm, and 10.3 cm. Your teacher revealed the correct measurement which is 10.0 cm.
In terms of accuracy and precision, your individual measurement is ______.
a)
accurate and precise
b)
accurate but not precise
c)
not accurate but precise
d)
neither accurate nor precise
6.
In a solution, this component is usually the one with a lesser amount.
a)
solvent
b)
solution
c)
solute
d)
mixture
7.
Calculate the given operation and express the final answer in proper significant figures:
750 kg / 60 kg
a)
12.5
b)
13
c)
1
d)
10
8.
The following are intensive properties of water EXCEPT:
a)
volume
b)
boiling point
c)
melting point
d)
density
9.
For a few days, Ada is watching the development of a larva into a butterly while taking down notes of the process. What scientific skill is Ada showing?
a)
drawing conclusions
b)
making observation
c)
making hypothesis
d)
interpreting the data
10.
Which of the following can be a good scientific question?
a)
Does the color of light affects the growth of chickens?
b)
Who is the president of Ukraine?
c)
What makes Saturn the lightest planet in the solar system?
d)
What makes me awesome?
11.
Which of the following classifications of matter cannot be broken down to simpler substance by chemical means?
a)
homogenous mixture
b)
heterogeneous mixture
c)
element
d)
compound
12.
This statement provides answers to the main problem in your study.
a)
hypothesis
b)
conclusion
c)
observation
d)
experiment procedure
13.
When you place a few drops of substance A to a red litmus paper. After a few seconds, the red litmus paper turns to blue. Which of the following is the correct interpretation of substance A?
a)
Substance A is a base.
b)
Substance A is an acid.
c)
Substance A is water.
d)
Substance A is an indicator.
14.
Which of the following values of pH indicates a strong base?
a)
2
b)
4
c)
11
d)
13
15.
This is an educated guess.
a)
hypothesis
b)
conclusion
c)
observation
d)
experiment procedure
16.
After drinking your orange juice, you noticed that there are still some sugar residues at the bottom of the glass. What kind of solution did you possibly make?
a)
unsaturated
b)
saturated
c)
supersatured
d)
heterogeneous
17.
Most of our jewelries are made of metal wires which are molded into several beautiful shapes. What property of metals are shown in this application?
a)
ductility
b)
malleability
c)
luster
d)
heat and electrical conductivity
18.
You accidentally combined 30 mL of water and 50 mL of alcohol into an empty container. Which of the following liquids became your solvent?
a)
alcohol
b)
water
c)
both alcohol and water
19.
What is the SI base unit of 1km?
a)
1000 m
b)
10 h
c)
100 dam
d)
10 000 dm
20.
Convert the scientific notation below into standard notation:
5.60 x 10-5 N
a)
0.000 056 0 N
b)
0.000 005 60 N
c)
560 000 N
d)
560 00 000 N
100 %
