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Elements Compounds And Mixtures
Test Description: 8th grade review of elements compounds and mixtures
Instructions: Answer all questions to get your test result.
1) What is a pure substance made of two or more elements that are chemically combined?
A
solutions
B
element
C
compound
D
mixture
2) Which of the following describes a mixture?
A
made up of two or more substances joined in a specific ratio
B
can be separated only by chemical means
C
formed from two or more substances chemically combine
D
made up of two or more substances that keep their identities
3) Which of the following substances can be separated into simpler substances only by chemical means?
A
gold
B
sodium
C
salt water
D
water
4) Which of these is NOT considered a pure substance
A
a compound
B
a mixture
C
an element
D
an atom
5) Because zinc can combine with other substances but cannot be changed into a simpler substance by an ordinary chemical process, zinc is classified as
A
a solution
B
a compound
C
a mixture
D
an element
6) Which of the following sentences best describes table salt?
A
Salt is a pure substance made from two compounds
B
salt is a mixture made from two elements
C
Salt is a compound made from two elements
D
salt is an element made from two mixtures
7) Which of the following does NOT describe elements?
A
can be broken down into simpler substances and retain the characteristics of the element
B
can join together to form compounds
C
have unique sets of properties
D
all the particles are alike
8) Air is
A
a pure substance
B
a mixture
C
a compound
D
an element
9) Italian dressing is
A
a element
B
a homogeneous mixture
C
a compound
D
a heterogeneous mixture
10) Which of the following is a compound
A
Carbon (C)
B
Copper (Cu)
C
club soda
D
Carbon Monoxide (CO)
11) How is a mixture different from a compound?
A
Mixtures are commonly found in nature.
B
Solids, liquids and gases can form mixtures.
C
Mixtures have two or more components
D
Each substance in a mixture keeps its identity.
12) A material is only a mixture if
A
you can physically separate the different components.
B
it develops its own set of characteristic properties.
C
you can always see all the components.
D
all of the above
13) . A dish is given to you, which contains a blackish-yellow powder. When you move a magnet over it, you are amazed to see black particles, (which you find out are iron) fly upwards and get stuck to the magnet, and all that's left in the dish is a yel
A
element
B
compound
C
pure substance
D
mixture
14) What type of mixture is salad
A
heterogeneous
B
solutions
C
salad is not a mixture
D
homogeneous
15) A solution is always a
A
heterogeneous mixture
B
homogeneous mixture
C
liquid
D
pure substance
*select an answer for all questions
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