Science worksheets for class 8
Access printable science worksheets for class 8
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.
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.
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.
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
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
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.
Water (H2O), is not found on the periodic table because water is a...
atom
liquid
mixture
compound
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.
Oxygen and iron combine chemically to form rust. Rust is classified as which of the following?
an atom.
an element.
a compound.
a mixture.
When the elements copper (Cu) and oxygen (O) chemically combine, they form...
an ion
a gas
a compound
a mixture
This image is a model of...
an element
a compound
a homogenous mixture
a heterogeneous mixture
This picture is a model of...
an element
a compound
a homogenious mixture
a heterogeneous mixture.
This picture is a model of a...
element
compound
homogeneous mixture
heterogeneous mixture
The image below is an example of
an atom
a molecule
a homogeneous mixture
a heterogeneous mixture
The image below is an example of
a homogeneous mixture
a compound
a heterogeneous mixture
an element
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