C2: Elements, Compounds and Mixtures Flashcards
Which images contain ONLY molecules?
A, C and D
(B is incorrect as it contains single atoms as well)
What is a compound?
A substance made up of atoms of 2 or more different atoms (elements) chemically joined together
What is a mixture?
A group of substances that are not chemically bonded together.
In which state are the substances shown in the diagrams?
Gas
How are properties of the compound H2O (water) different to the properties of its elements?
H2 - hydrogen is a gas
O - oxygen is a gas
H2O - water is a liquid
Are the properties of a compound the same as the properties of the elements that make the compound?
No compounds have different properties compared to their elements.
Salt is a common compound. What is the chemical name for salt?
Sodium Chloride
(NaCl)
Which image shows a compound made from 3 different types of element?
C
Which image shows a mixture?
B
Which images show compounds?
A and C
Compounds containing 2 elements always end in which suffix?
“ide”
e.g. sodium + chlorine –> sodium chloride
What is a molecule?
When more than one atom is bonded together.
The diagram below shows some particles of a substance at room temperature.
Explain what the diagram tells you about the substance.
- The substance is made up of molecules.
- The substance is in the gas state at room temperature…
- …since its molecules are separate from each other and randomly arranged.
- The substance is a compound…
- …since it is made up of atoms of more than one element.
- One molecule of the substance is made up of one atom of one element and two atoms of another element.
Calcium sulfate contains which elements?
Calcium (calcium)
Sulfur (sulf-)
Oxygen (-ate)
Iron and chlorine react together to form which compound?
Iron chloride
