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Group 7

8th grade (Year 9 in England) · 16 questions · Common Core: NGSS.HS-PS1-1, NGSS.HS-PS1-2 · England: GCSE Combined Science: Atomic structure and the periodic table (group 7)

Name

Date

Score/ 16

1
Question 1
Why is chlorine added to drinking water and swimming pools?
- A. to kill microorganisms
- B. to make it fizzy
- C. to add minerals
- D. to make the water blue
2
Question 2
Bromine water is added to potassium chloride solution. Will a reaction happen?
- A. yes: bromine displaces chlorine
- B. no reaction
3
Question 3
The halogens: which statement is true?
- A. Iodine is more reactive than chlorine.
- B. Boiling points of halogens decrease down the group.
- C. Halogens form ions with a 1− charge.
- D. Halogens are found as single atoms.
4
Question 4
Halogens exist as molecules. What is the formula of a chlorine molecule?
- A. Cl
- B. Cl₃
- C. Cl₂
- D. Cl⁻
5
Question 5
Iodine water is added to potassium chloride solution. Will a reaction happen?
- A. yes: iodine displaces chlorine
- B. no reaction
6
Question 6
The halogens: which statement is true?
- A. Boiling points of halogens decrease down the group.
- B. Iodine is more reactive than chlorine.
- C. Halogens are found as single atoms.
- D. Halogens react with metals to form salts.
7
Question 7
Why does reactivity decrease down group 7?
- A. The outer shell is further from the nucleus, so gaining an electron is harder
- B. Halogens are metals
- C. The atoms lose electrons more easily
- D. The atoms have fewer outer electrons
8
Question 8
Iodine water is added to potassium chloride solution. Will a reaction happen?
- A. yes: iodine displaces chlorine
- B. no reaction
9
Question 9
The halogens: which statement is true?
- A. Iodine is more reactive than chlorine.
- B. Boiling points of halogens decrease down the group.
- C. Halogens are found as single atoms.
- D. Fluorine is the most reactive halogen.
10
Question 10
Halogens exist as molecules. What is the formula of a chlorine molecule?
- A. Cl⁻
- B. Cl₃
- C. Cl
- D. Cl₂
11
Question 11
Bromine water is added to potassium iodide solution. Will a reaction happen?
- A. yes: bromine displaces iodine
- B. no reaction
12
Question 12
The halogens: which statement is true?
- A. Boiling points of halogens decrease down the group.
- B. Halogens have seven electrons in their outer shell.
- C. Iodine is more reactive than chlorine.
- D. Halogens are found as single atoms.
13
Question 13
Halogens exist as molecules. What is the formula of a chlorine molecule?
- A. Cl
- B. Cl₂
- C. Cl⁻
- D. Cl₃
14
Question 14
Iodine water is added to potassium bromide solution. Will a reaction happen?
- A. yes: iodine displaces bromine
- B. no reaction
15
Question 15
The halogens: which statement is true?
- A. Boiling points of halogens decrease down the group.
- B. Halogens form ions with a 1− charge.
- C. Halogens are found as single atoms.
- D. Iodine is more reactive than chlorine.
16
Question 16
Why is chlorine added to drinking water and swimming pools?
- A. to add minerals
- B. to make the water blue
- C. to kill microorganisms
- D. to make it fizzy

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Answer key: Group 7

1. A. to kill microorganisms
2. B. no reaction
3. C. Halogens form ions with a 1− charge.
4. C. Cl₂
5. B. no reaction
6. D. Halogens react with metals to form salts.
7. A. The outer shell is further from the nucleus, so gaining an electron is harder
8. B. no reaction
9. D. Fluorine is the most reactive halogen.
10. D. Cl₂
11. A. yes: bromine displaces iodine
12. B. Halogens have seven electrons in their outer shell.
13. B. Cl₂
14. B. no reaction
15. B. Halogens form ions with a 1− charge.
16. C. to kill microorganisms