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CSEE (Form 4) Representing Chemical Change — practice questions

Explore 3 free Representing Chemical Change questions in CSEE (Form 4) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Representing Chemical Change questions and exercises with answers

Showing questions 1–3 of 3.

In a chemical equation, what are the substances written on the left of the arrow called?Read the answer and worked solution →Which state symbol shows that a substance is dissolved in water?Read the answer and worked solution →When balancing a chemical equation, what may be changed so that the atoms match on both sides?Read the answer and worked solution →

Worked practice questions

In a chemical equation, what are the substances written on the left of the arrow called?

  1. The products
  2. The catalysts
  3. The reactants
  4. The solvents
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Correct answer: C. The reactants

1. A chemical equation describes a reaction using symbols for the elements involved. 2. Compounds on the left of the arrow are called the reactants and are needed for the reaction to take place. 3. The compounds on the right are the products, which is what the reaction forms. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 14: Representing chemical change_

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Which state symbol shows that a substance is dissolved in water?

  1. The symbol s
  2. The symbol g
  3. The symbol l
  4. The symbol aq
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Correct answer: D. The symbol aq

1. Four state symbols are used to show the phase of each substance in an equation. 2. The symbol aq stands for an aqueous solution, which means dissolved in water. 3. The symbols s, l and g stand for solid, liquid and gas. 4. Each symbol is written in brackets straight after the compound it describes. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 14: Representing chemical change_

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When balancing a chemical equation, what may be changed so that the atoms match on both sides?

  1. The subscripts in a formula
  2. The symbols of the elements
  3. The arrow between the sides
  4. The coefficients in front
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Correct answer: D. The coefficients in front

1. Balancing an equation makes the atom count match, because atoms are conserved. 2. Coefficients can be placed in front of the reactants and products until the counts agree. 3. A coefficient says how many units of that substance take part. 4. Subscripts inside a formula may never be touched, because changing them changes the substance itself. 5. Changing a subscript would turn water into hydrogen peroxide, which is a different compound. 6. The element symbols and the arrow are fixed by the reaction being described. 7. After balancing, always recount the atoms of each element on both sides as a check. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 14: Representing chemical change_

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