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WorksheetsElements, compounds and mixtures
Total questions: 50
Worksheet time: 50mins
Examples are diamonds (C) and Uranium (U)
elements
mixtures
compounds
Beatriz wants to make a mixture out of her bowl of blueberries. Which of the following would turn her bowl of blueberries into a mixture?
adding more blueberries to the bowl
adding raspberries to the bowl
cutting up the blueberries
mashing the blueberries
Humans absorb oxygen from the air they breathe in and exhale carbon dioxide gas, CO2. Carbon dioxide gas is
an element made of carbon and oxygen atoms.
a solution made of carbon and oxygen atoms.
a compound of carbon and oxygen atoms.
a mixture of carbon and oxygen atoms.
Which example is a compound?
N2
O2
Cu
H2O2
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.
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
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
