Grade 10 Physical Sciences · Matter and Materials

Write names and formulae of compounds

Write the formula of a compound from its name, or the name from its formula (sodium chloride is NaCl).

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Question 1.4 · November 2023 · Paper 2 · Provincial · 2 marks

Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.9) in the ANSWER BOOK, e.g. 1.10 D.

1.4 Metal M forms a nitrate with the formula

MNO_{3}

. Which of the following formulae for compounds of M is NOT correct?(2)

A $M_{2} SO_{4}$
B $MC ℓ$
C $M(OH)_{2}$
D $M_{2} CO_{3}$

Work it out on paper first. Then mark yourself with the official memo, one tick at a time.

More past paper questions: write names and formulae of compounds

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3. Question 2.1.5 · November 2024 · Paper 2 · Provincial · 2 marks
2.1 In the table below are different substances.

Use the following substances to answer the questions that follow.
2.1.5 Write down the chemical formula for substance F (Ammonium nitrate).(2)
Show the memo (1 tick)Memo
1. ✓
  Formula of ammonium nitrate $NH_{4} NO_{3}$
  2 marks · Write names and formulae of compounds
4. Question 4.2.3 · November 2024 · Paper 2 · Provincial · 2 marks
4.2 Aluminium is a metal and a good conductor of electricity.

Answer the questions that follow.
Aluminium reacts with nitrogen according to the following reaction equation:

$A ℓ + N_{2} \to A ℓ N$
4.2.3 Name the product that forms.(2)
Show the memo (1 tick)Memo
1. ✓
  Name of AℓNAluminium nitride
  2 marks · Write names and formulae of compounds
5. Question WE4 · Siyavula Grade 10 Physical Sciences, 2.4 Names and formulae of substances, Worked example 4 · 3 marks
WE4 What is the formula for magnesium chloride?(3)
Show the memo (3 ticks)Memo
1. ✓
  Ions $Mg^{2 +}$ and $Cl^{-}$
  1 mark · Write names and formulae of compounds
2. ✓
  RatioMagnesium has a charge of $+ 2$ and needs two chlorides to balance the charge: a $1 : 2$ ratio. With the cross method, $Mg^{2 +} \to 1$ and $Cl^{-} \to 2$ .
  1 mark · Write names and formulae of compounds
3. ✓
  Formula $MgCl_{2}$
  1 mark · Write names and formulae of compounds
6. Question WE6 · Siyavula Grade 10 Physical Sciences, 2.4 Names and formulae of substances, Worked example 6 · 3 marks
WE6 Write the formula for copper(II) nitrate.(3)
Show the memo (3 ticks)Memo
1. ✓
  Ions $Cu^{2 +}$ (the question asks for copper(II), not copper(I)) and $NO_{3}^{-}$
  1 mark · Write names and formulae of compounds
2. ✓
  RatioCross method: $Cu^{2 +} \to 1$ and $NO_{3}^{-} \to 2$ , so the ratio is $1 : 2$ .
  1 mark · Write names and formulae of compounds
3. ✓
  Formula $Cu(NO_{3})_{2}$
  1 mark · Write names and formulae of compounds

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