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Elements, compounds and mixtures

6th grade (Year 7 in England) · 16 questions · Common Core: NGSS.MS-PS1-1 · England: KS3 Chemistry: Atoms, elements and compounds, KS3 Chemistry: Pure and impure substances

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1
Question 1
Elements and compounds: which statement is NOT true?
- A. A compound contains two or more elements chemically joined.
- B. Water is an element.
- C. Air is a mixture.
- D. Mixtures can be separated by physical methods such as filtering.
2
Question 2
What is the smallest particle of an element that still has its properties?
- A. a mixture
- B. an atom
- C. a cell
- D. a crystal
3
Question 3
Is iron an element, a compound or a mixture?
- A. element
- B. compound
- C. mixture
4
Question 4
Elements and compounds: which statement is NOT true?
- A. There are over 100 known elements.
- B. A compound can be separated by filtering.
- C. A compound contains two or more elements chemically joined.
- D. Mixtures can be separated by physical methods such as filtering.
5
Question 5
How many elements are there in water, H₂O?
- A. 1
- B. 2
- C. 3
- D. 4
6
Question 6
Is air an element, a compound or a mixture?
- A. element
- B. compound
- C. mixture
7
Question 7
Elements and compounds: which statement is NOT true?
- A. There are over 100 known elements.
- B. A compound can be separated by filtering.
- C. Mixtures can be separated by physical methods such as filtering.
- D. Air is a mixture.
8
Question 8
Sodium is a reactive metal and chlorine is a poisonous gas. What is sodium chloride like?
- A. a poisonous gas
- B. table salt, which is safe to eat in small amounts
- C. exactly like sodium
- D. a shiny metal
9
Question 9
Is soil an element, a compound or a mixture?
- A. element
- B. compound
- C. mixture
10
Question 10
Elements and compounds: which statement is NOT true?
- A. There are over 100 known elements.
- B. Air is a mixture.
- C. Mixtures can be separated by physical methods such as filtering.
- D. A compound can be separated by filtering.
11
Question 11
How many elements are there in water, H₂O?
- A. 2
- B. 1
- C. 3
- D. 4
12
Question 12
Is ammonia (NH₃) an element, a compound or a mixture?
- A. element
- B. compound
- C. mixture
13
Question 13
Elements and compounds: which statement is NOT true?
- A. Water is an element.
- B. Air is a mixture.
- C. There are over 100 known elements.
- D. Mixtures can be separated by physical methods such as filtering.
14
Question 14
Iron and sulfur are heated together and form iron sulfide. Why is iron sulfide a compound, not a mixture?
- A. It contains iron
- B. It can be separated with a magnet
- C. It is a powder
- D. The elements are chemically joined, and a magnet no longer separates the iron
15
Question 15
Is salt and sand an element, a compound or a mixture?
- A. element
- B. compound
- C. mixture
16
Question 16
Elements and compounds: which statement is NOT true?
- A. Water is an element.
- B. Mixtures can be separated by physical methods such as filtering.
- C. Air is a mixture.
- D. There are over 100 known elements.

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