Lesson T2.1.2
T2.1.2 Atoms, elements and compounds Quiz: KS3 Chemistry, Unit 2
20 questions
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Lesson T2.1.2, Atoms, elements and compounds: 20 multiple choice questions for the KS3 Chemistry (National Curriculum), Unit 2: Atoms, elements and compounds, written with Revision Ninja.
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The 20 questions
-
What is a chemical element?
- Compound molecules
- Mixed substances
- One atom type
- Two bonded atoms
-
What defines a chemical compound?
- Mixed single atoms
- Bonded different elements
- Single atom type
- Unbonded elements
-
Which of these is an element?
- Water
- Iron
- Carbon dioxide
- Table salt
-
Which of these is a compound?
- Oxygen
- Copper
- Gold
- Water
-
What is the relationship between an atom and an element?
- Atoms contain elements
- They are identical
- Atoms build elements
- Elements build atoms
-
How are different atoms held together within a chemical compound?
- Electrostatically floating
- Magnetically linked
- Physically mixed
- Chemically bonded
-
What process is required to separate a compound into its elements?
- Physical straining
- Magnetic separation
- Chemical reaction
- Simple filtration
-
Why can iron be separated from a sulfur mixture using a magnet?
- Fused by heat
- Forming a compound
- Not chemically bonded
- Sharing electrons
-
A substance is found to contain only carbon atoms. What is it?
- An element
- A mixture
- A compound
- A solution
-
What is the ratio of sodium to chlorine atoms in sodium chloride?
- One to two
- Two to one
- One to one
- Three to one
-
Why is pure water classified as a chemical compound?
- Made of one element
- Contains joined atoms
- Formed by simple mixing
- Separated by filtration
-
What is air classified as according to its chemical composition?
- A physical mixture
- A single element
- A bonded molecule
- A pure compound
-
What is true about the properties of a compound compared to its elements?
- Properties are magnetic
- Properties are mixed
- Properties are identical
- Properties are different
-
Which combination creates a physical mixture rather than a compound?
- Sodium and chlorine
- Iron and sulfur
- Hydrogen and oxygen
- Sand and salt
-
How many types of atom are present in an element?
- At least three
- Two
- Only one
- Exactly ten
-
Which compound contains three different chemical elements?
- Sodium chloride
- Calcium carbonate
- Water
- Carbon dioxide
-
What is a key characteristic of the composition of any compound?
- Variable mixture
- Fixed mass ratio
- Unbonded atoms
- Random proportions
-
Why can a magnet not separate the elements inside a compound?
- Strong chemical bonds
- Loose mixtures
- Weak physical forces
- Magnetic shielding
-
What happens to atoms when they react to form a compound?
- Destroy themselves
- Rearrange and bond
- Remain unbonded
- Dissolve physically
-
Which option lists an element followed by a compound?
- Sodium chloride and iron
- Copper and carbon dioxide
- Hydrogen and helium
- Water and oxygen
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