New
New
Year 7
Compounds and their formation
I can explain the difference between a compound and an element.
New
New
Year 7
Compounds and their formation
I can explain the difference between a compound and an element.
Lesson details
Key learning points
- A compound is made of two or more different elements chemically bonded through a chemical reaction.
- A compound may have different properties to each of the elements that it is made from.
Common misconception
Compounds will have the same properties as the elements from which they are made.
Compounds usually have completely different properties from the elements from which they are made.
Keywords
Chemical compound - A substance made by a chemical reaction where two or more different elements chemically bond together.
Chemical bond - A strong force that holds atoms together in a compound. A chemical bond takes lots of energy to overcome and break.
It is best to use many examples of compounds and the elements from which they are formed. Sodium metal and chlorine gas are both dangerous and toxic to humans, however sodium chloride is added to food making, this a good example to use.
Teacher tip
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
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6 Questions
Q1.
What does each element on the periodic table represent?
A type of molecule
A compound
A mixture
Q2.
According to Dalton's atomic theory, what is an atom?
A tiny ball that can be split
A type of molecule
A type of compound
Q3.
What is a chemical bond?
A reaction that splits elements
A method to separate compounds
The process of melting elements
Q4.
Which of the following are the correct symbols for the elements stated?
Su - sulfur
f - fluorine
NI - nickel
Q5.
Which of the following is a pure substance?
Air (includes oxygen, nitrogen, argon, carbon dioxide etc.)
Sea water (salty water)
Q6.
All matter is made up of...
Exit quiz
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6 Questions
Q1.
What defines a chemical compound?
A single element in its pure form.
A mixture of elements without chemical bonding.
A solid element only.
Q2.
In a chemical reaction, what happens when a chemical bond is formed?
Elements lose their properties.
The elements separate physically.
It creates a mixture.
Q3.
Which of the following words can be used to describe the following substance? Look at the diagram below.
Element
Mixture
Q4.
Which of the following is a chemical compound?
O₂ (Oxygen gas)
N₂ (Nitrogen gas)
He (Helium gas)
Q5.
Which statement is true about a chemical compound?
It can be separated back into its elements by physical means.
It has the same properties as its component elements.
It consists of only one type of atom.
Q6.
Why do compounds have different properties than the elements they are made from?
The elements forget about their properties.
Compounds are always changing their properties
Only metals form compounds.