Lesson T2.1.2
T2.1.2 Atoms, elements and compounds Quiz: KS3 Chemistry, Unit 2
20 questions
In partnership with Revision Ninja
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.
Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.
The 20 questions
-
What is an element?
- A substance made of particles that are always charged
- A mixture of atoms that can be separated by filtration
- A substance made of only one type of atom
- A substance made of two or more types of atom chemically joined
-
What is a compound?
- A substance made of one element only, with all atoms of the same kind
- A substance made of two or more elements chemically joined in a fixed ratio
- A mixture of elements that can be separated by a magnet or by filtration
- A solution of atoms dissolved in a liquid, which can be separated by evaporation
-
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 difference between an atom and an element?
- An element is always a gas, while an atom is always a solid made of the same material
- An atom and an element are the same thing with different names used in different books
- An atom is the smallest particle of an element; an element is a substance made only of such atoms
- An atom is a substance; an element is a particle that is smaller than an atom, made of protons
-
Which statement best describes the atoms in a compound?
- They are always separated from each other by filtration in a laboratory
- They are all atoms of the same element, joined together in a simple repeating pattern
- They are simply mixed together without any chemical bonds holding them together
- They are chemically bonded to atoms of other elements
-
How can a compound be separated into its elements?
- By a magnet, because the atoms in the compound are strongly metallic in nature
- By evaporation, because the compound has no chemical bonds holding its atoms together
- By a chemical reaction, because the bonds between atoms must be broken
- By filtration, because the particles are too large to pass through the filter paper
-
Why is a mixture of iron filings and sulfur not a compound?
- Its parts always react together to form a gas, which can then be collected
- Its parts are bonded together in a fixed ratio, so it is a single new substance
- Its parts are not chemically bonded and can be separated by a magnet
- It contains only one element, so there is no need to separate anything at all
-
A substance is found to contain only carbon atoms. What is it?
- An element
- A mixture
- A compound
- A solution
-
Which of these describes a compound?
- A single atom of sodium surrounded by water
- A mixture of sodium and chlorine atoms that are not joined
- Sodium and chlorine atoms joined in a 1:1 ratio
- Two separate samples of chlorine gas in one container
-
Why is water a compound and not an element?
- Its molecules contain only oxygen atoms, which are bonded in pairs in the liquid
- Its molecules contain atoms of hydrogen and oxygen chemically joined
- It is a liquid at room temperature, so it cannot contain any chemically bonded atoms
- It can be separated into its parts by a magnet, which pulls the hydrogen away
-
A student says air is a compound because it has oxygen and nitrogen in it. What is wrong?
- Air is a mixture because its gases are not chemically joined
- Air is a compound because oxygen and nitrogen are always bonded
- Air is a solution of solid particles in water
- Air is an element because it contains only one type of gas
-
Which example shows a compound with properties very different from the elements that form it?
- Carbon and oxygen always form a liquid at room temperature, which can then be poured
- Hydrogen and oxygen always form a solid at room temperature when they are mixed
- Iron and oxygen combine to form a gas that is always heavier than the air around it
- Sodium and chlorine are dangerous, but the compound sodium chloride is table salt
-
Which of these is a mixture rather than a compound?
- Sodium chloride made by heating sodium in chlorine
- Carbon dioxide formed by burning carbon
- Water made by burning hydrogen
- Sand and salt stirred together
-
How many types of atom are present in an element?
- At least three
- Two
- Only one
- Exactly ten
-
Which of these is a compound that contains three different elements?
- Iron oxide, made of iron and oxygen only, in a fixed ratio of atoms
- Calcium carbonate, made of calcium, carbon and oxygen
- Brass, a mixture of copper and zinc that is not chemically bonded together
- Carbon dioxide, made of carbon and oxygen only, in a ratio of one to two
-
Which of these is correct about compounds?
- A compound can contain any ratio of its elements, depending on how it is made
- A compound always has the same ratio of its elements by mass
- A compound can be split into its elements by filtration in the laboratory
- A compound is always a solid at room temperature and cannot be poured
-
Why can the atoms in a compound not be separated by a magnet like a mixture?
- Atoms are chemically bonded, which needs a chemical reaction to break
- Atoms in compounds are always liquid, so they flow away from the magnet
- Atoms are too small to feel magnetic forces at all, even in a strong magnet
- Atoms are made of electrons that repel magnets, so the magnet pushes them away
-
Which of these describes atoms of an element reacting with another element to form a compound?
- Atoms merge into a single larger atom of the same element as they react together
- Atoms rearrange and form new bonds, making a new substance
- Atoms mix physically and separate again with a filter in the laboratory
- Atoms are converted into energy with no new substance, so the mass is lost
-
Which pair includes an element and a compound?
- Iron, an element, and steel, which is a mixture of iron with carbon
- Copper, an element, and carbon dioxide, a compound
- Air, a mixture of gases, and sea water, which is also a mixture
- Water, a compound, and sea water, which is a mixture of many substances
Related quizzes
- Dalton atomic model Quiz · T2.1.1 · 20 questions
- Chemical symbols and formulae Quiz · T2.2.1 · 20 questions
- Conservation of mass Quiz · T2.2.2 · 20 questions
- Solids, liquids and gases Quiz · T1.1.1 · 20 questions
- The carbon cycle Quiz · T10.1.1 · 20 questions
- Pure substances and identifying them Quiz · T3.1.1 · 20 questions
- Rearranging atoms in reactions Quiz · T4.1.1 · 20 questions
- Acids, alkalis and neutralisation Quiz · T5.1.1 · 20 questions
- Energy changes on changes of state Quiz · T6.1.1 · 20 questions
- Mendeleev and the Periodic Table Quiz · T7.1.1 · 20 questions