Starter quiz
- What state of matter has particles held in fixed positions?
- Liquid
- Gas
- Solid ✓
-
- Where are non-metals located on the periodic table?
- Left side
- Middle
- Right side ✓
- Bottom
-
- What is the boiling point of water (in °C)? Give your answer as a number.
- '100' ✓
- Which element's model is described as a ball that cannot be broken
- Dalton's ✓
- Newton's
- Einstein's
- Bohr's
-
- Elements are considered pure substances because they...
- are gases at room temperature.
- can be broken down into simpler substances.
- consist of only one substance. ✓
- always react with other elements.
-
- What does it mean when elements react together?
- they change state
- they form a mixture
- they form a new substance ✓
- they separate into atoms
-
Exit quiz
- What is a molecule?
- a single atom
- a combination of two or more atoms ✓
- a type of metal
- a form of energy
-
- Which of the following is a diatomic molecule?
- Helium (He)
- Oxygen (O₂) ✓
- Neon (Ne)
- Argon (Ar)
-
- Identify the diatomic molecules.
N₂O
H₂ ✓
HCl ✓
SiO₂
- Which gas is monatomic?
- Oxygen (O₂)
- Chlorine (Cl₂)
- Neon (Ne) ✓
- Hydrogen (H₂)
-
- Which statement about molecules is incorrect?
- All molecules are made of atoms.
- Molecules can consist of atoms from different elements.
- All gases at room temperature are diatomic. ✓
- Molecules are held together by chemical bonds.
-
- The molecular formula for a diatomic nitrogen molecule is...
- 'N₂' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Many non-metals are in the gas state at room temperature.
- Some non-metals form diatomic molecules that contain two atoms (e.g. O₂, N₂, H₂, Cl₂).
- Some non-metals are monatomic and do not form molecules.
- Noble gases are monatomic and are listed in the right-hand column of the periodic table.
Common misconception
Assuming that substances like sodium chloride (NaCl) are diatomic.
It is very important to emphasise that only non-metals exist as monatomic or molecules.
Keywords
Molecule - Molecules are made up of two or more atoms chemically bonded together. These are usually non-metals.
Monatomic - A monatomic element consists of only single atoms.
Diatomic - A diatomic element consists of two of the same type of atom chemically bonded together.
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