Start learning →

BECE (Ghana) Chemical Reactions and Equations — practice questions

Explore 5 free Chemical Reactions and Equations questions in BECE (Ghana) Science. Open each question or exercise to read its content, reference answers and available explanation.

Practise Chemical Reactions and Equations with Quill →

Chemical Reactions and Equations questions and exercises with answers

Showing questions 1–5 of 5.

What happens to the starting substances during a chemical reaction?Read the answer and worked solution →What do we call the substances that are present before a reaction takes place?Read the answer and worked solution →During a chemical reaction, what happens to the atoms of the reactants?Read the answer and worked solution →Milk left standing for a few days tastes sour. Which process has produced that taste?Read the answer and worked solution →Clear limewater turns milky white when a gas is bubbled through it. Which gas was in the bubbles?Read the answer and worked solution →

Worked practice questions

What happens to the starting substances during a chemical reaction?

  1. They change into smaller pieces
  2. They change only their colour
  3. They change into new substances
  4. They change only their shape
Show answer and solution

Correct answer: C. They change into new substances

1. A chemical reaction turns one or more substances into different ones. 2. The new substances have their own properties, which is why we notice a change. 3. Cutting or crushing only changes shape and size, so that is a physical change. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), How do we know a chemical reaction has taken place?_

Open this question →

What do we call the substances that are present before a reaction takes place?

  1. The products
  2. The residues
  3. The solvents
  4. The reactants
Show answer and solution

Correct answer: D. The reactants

1. A chemical equation is written with an arrow pointing from left to right. 2. The substances written before the arrow are there at the start. 3. Those starting substances are called the reactants. 4. The substances made by the reaction are called the products. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Reactants and products_

Open this question →

During a chemical reaction, what happens to the atoms of the reactants?

  1. They are rearranged into new compounds
  2. They are destroyed inside the flask
  3. They are created out of the liquid
  4. They are changed into new elements
Show answer and solution

Correct answer: A. They are rearranged into new compounds

1. Old bonds between atoms break and new bonds form during a reaction. 2. The same atoms end up joined in different combinations. 3. So a chemical reaction is a rearrangement of atoms into new compounds. 4. Atoms are neither created nor destroyed in a chemical reaction, which rules out two options. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), A chemical reaction is a rearrangement of atoms_

Open this question →

How to practise

  1. Choose a Chemical Reactions and Equations question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

More Science topics

Visible LightElectric CircuitsThe Solar SystemAtoms and ElementsChanges of StateEcosystemsMicroorganismsParticle Model of Matter