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WorksheetsElements, Compounds and Mixtures
Total questions: 10
Worksheet time: 9mins
The chart below lists some substances and their symbols. How many of these substances are examples of elements?
1
2
3
4
What makes elements and compounds different from mixtures? Elements & compounds-
have a constant composition (pure substances)
are made of gases
Will not change when heated
conduct electric current
What is the relationship between molecules and atoms?
Molecules are combinations of two or more atoms.
Molecules are the parts that make up atoms
Molecules are the gaseous parts of atoms
Molecules are atoms that have a positive charge
In the diagrams provided, the circles of different colors represent the atoms of different elements. Which diagram represents a mixture?
I
II
III
IV
Mixtures are different than pure substances because mixtures-
have lower boiling points
can be separated physically
are less dense than pure substances
contain only one type of atom
Which answer correctly matches the diagram with the correct description?
Q- Multiple compounds R-A single element S-An element and a compound T- A single compound
Q- A single element, R- An element and a compound S-A single compound T-Multiple compounds
Q- A single compound, R- A single element, S- Multiple compounds, T- An element and a compound
Q- An element and a compound, R- a single compound, S- a single element, T- multiple compounds
Which of the following is true of oxygen?
Oxygen is an element because its most basic unit is a single type of atom
Oxygen is a compound because its most basic unit is a single type of atom.
Oxygen is a mixture because its most basic unit contains more than one particle.
Oxygen is a compound because its most basic unit contains more than one type of particle.
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.
Sam's mother is cooking breakfast in a cast-iron frying pan. If the pan is made only of iron, what can Sam conclude?
The pan is a pure substance with the chemical symbol Ir.
The pan is a pure substance with the chemical symbol I.
The pan is a pure substance with the chemical symbol F.
The pan is a pure substance with the chemical symbol Fe.
