Elements, Compounds and Mixtures
Assessment
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Amanda Haynes
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Science
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8th Grade
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15K plays
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Medium
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15 questions
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1.
Multiple Choice
Which of the following is an example of the formation of a mixture?
Rust forming on an iron nail.
Sugar crystals dissolving in water.
Sodium and chlorine forming table salt.
Hydrogen and oxygen reacting to produce oxygen.
2.
Multiple Choice
Which statement identifies why oxygen is classified as a pure substance and air is classified as a mixture?
Oxygen is more reactive than air.
Oxygen has a higher density than air.
Oxygen goes under a phase change, whereas air is always a gas.
Oxygen contains only one substance, but air contains several substances.
3.
Multiple Choice
Which of the following is an example of of a container filled with a pure substance rather than with a mixture?
A tire filled with air.
A jar filled with salt water.
A balloon filled with helium.
A glass filled with chocolate milk.
4.
Multiple Choice
When electricity passes through water, hydrogen and oxygen are produced. Which table correctly labels the compounds and elements involved in the process?
Water-->Compound
Hydrogen-->Compound
Oxygen--->Element
Water-->Compound
Hydrogen--->Element
Oxygen--->Compound
Water--->Compound
Hydrogen--->Element
Oxygen--->Element
5.
Multiple Choice
The chemical equation shown below represents a reaction that produces fuel for certain cars.
CO + H2O------->CO2 + H2
Which substance in this equation is classified as an element?
CO
O2
CO2
H2
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