Lesson 5.1.1.1
5.1.1.1 Atoms, elements and compounds Quiz: AQA Combined Science, Unit 8
20 questions
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Lesson 5.1.1.1, Atoms, elements and compounds: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 8: Atomic structure and the periodic table, written with Revision Ninja.
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The 20 questions
-
What is the definition of an atom?
- A subatomic electron
- A chemical compound
- A bonded molecule
- Smallest element part
-
About how many different elements are there?
- about 100
- about 1000
- about 10
- exactly 92
-
What does the chemical symbol O represent?
- Oxygen atom
- Hydrogen ion
- Carbon atom
- Nitrogen molecule
-
How are compounds formed from elements?
- Magnetic attraction
- Simple filtration
- Physical mixing
- Chemical reactions
-
In what proportions are the elements in a compound combined?
- varying proportions
- random proportions
- equal masses always
- fixed proportions
-
How can chemical compounds be separated back into their elements?
- Magnetic separation
- Simple distillation
- Chemical reactions
- Evaporation
-
What do all chemical reactions always involve?
- Temperature increase
- Gas evolution
- New substances formed
- Colour change
-
What is the chemical symbol for sodium?
- Sd
- Na
- So
- S
-
Which formula represents water?
- H2O2
- OH
- H2O
- HO2
-
What are the reactants in the word equation for magnesium burning in oxygen?
- Magnesium and water
- Magnesium oxide only
- Magnesium and oxygen
- Oxygen and carbon
-
When two substances mix and release heat while forming a new substance, what type of change is this?
- physical change
- simple mixing
- dissolving salt
- chemical reaction
-
Which phrase describes sodium chloride as a compound?
- chemically combined
- physically mixed
- dissolved together
- bonded ionically
-
Which name matches the formula NaCl?
- sodium carbonate
- sodium oxide
- chlorine sodium
- sodium chloride
-
Which symbol belongs to an element in the first 20 elements of the periodic table?
- Au
- Ca
- Zn
- Cs
-
Sodium oxide has the formula Na2O. What is the ratio of sodium atoms to oxygen atoms?
- 1 to 2
- 2 to 2
- 2 to 1
- 1 to 1
-
What type of process is required to separate a compound into elements?
- physical separation
- filtration process
- distillation method
- chemical reaction
-
(Higher tier) Which half equation shows copper ions gaining electrons?
- Cu + Cu -> Cu2
- Cu2+ + 2e- -> Cu
- Cu -> Cu2+ + 2e-
- Cu2+ -> Cu + 2e-
-
Balance the equation H2 + O2 -> H2O. Which is correct?
- H2 + 2O2 -> 2H2O
- 2H2 + O2 -> 2H2O
- H2 + O2 -> H2O
- 2H2 + 2O2 -> 2H2O
-
How many types of atom does a pure element contain?
- multiple types
- bonded types
- one type
- two types
-
What is pure water classified as scientifically?
- an element
- a mixture
- a compound
- a solution
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