Elements vs. Compounds. Vs. Mixtures
Authored by Amelia Barber
Science
8th Grade
NGSS covered
Used 4+ times
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28 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 3 pts
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 QUESTION
2 mins • 4 pts
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 QUESTION
2 mins • 3 pts
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 QUESTION
2 mins • 4 pts
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
Tags
NGSS.MS-PS1-1
5.
MULTIPLE CHOICE QUESTION
2 mins • 4 pts
Water (H2O), is not found on the periodic table because water is a...
atom
liquid
mixture
compound
Tags
NGSS.MS-PS1-1
6.
MULTIPLE CHOICE QUESTION
2 mins • 4 pts
Which of the following explains why saltwater is considered a mixture?
It is composed of one element.
It is composed of one compound.
It is composed of two or more substances and has new chemical properties.
It is composed of two or more substances and retains their own chemical properties.
7.
MULTIPLE CHOICE QUESTION
2 mins • 3 pts
Oxygen and iron combine chemically to form rust. Rust is classified as which of the following?
an atom.
an element.
a compound.
a mixture.
Tags
NGSS.MS-PS1-1
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