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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
- 6. Multiple Choice
Which changes MUST happen for elements to become a compound?
elements are heated
a gas becomes a liquid
elements dissolve in water
chemical bonds form between atoms.
- 7. Multiple Choice
Water (H2O), is not found on the periodic table because water is a...
atom
liquid
mixture
compound
- 8. Multiple Choice
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.
- 9. Multiple Choice
Oxygen and iron combine chemically to form rust. Rust is classified as which of the following?
an atom.
an element.
a compound.
a mixture.
- 10. Multiple Choice
When the elements copper (Cu) and oxygen (O) chemically combine, they form...
an ion
a gas
a compound
a mixture
- 11. Multiple Choice
This image is a model of...
an element
a compound
a homogenous mixture
a heterogeneous mixture
- 12. Multiple Choice
This picture is a model of...
an element
a compound
a homogenious mixture
a heterogeneous mixture.
- 13. Multiple Choice
This picture is a model of a...
element
compound
homogeneous mixture
heterogeneous mixture
- 14. Multiple Choice
The image below is an example of
an atom
a molecule
a homogeneous mixture
a heterogeneous mixture
- 15. Multiple Choice
The image below is an example of
a homogeneous mixture
a compound
a heterogeneous mixture
an element
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