How to Master Melting Point Questions and Build Confidence in Primary Science

Melting point questions are commonly tested in Primary Science, especially in topics related to the three states of matter. While the concept may seem simple, many students lose marks because they struggle to interpret information from the table and confuse whether a substance is in the solid, liquid or gaseous state at a given temperature.

Try the question on Melting Point below:

The table below shows the melting and boiling points of some substances.

Which of the following statement(s) is/are true? Select all correct answer(s).

• At 80°C, substance C changes from liquid state to gaseous state.

• At 65°C, only three substances remain in liquid state.

• Only two substances are liquid at 15°C.

• At 95°C, substance D is in its gaseous state.

To answer questions like this confidently, students must first understand the relationship between melting point, boiling point and the states of matter. When a substance is below its melting point, it remains in the solid state. When the temperature is between its melting point and boiling point, it exists as a liquid. When the temperature rises above its boiling point, it turns into gaseous state.

However, knowing the concept alone is not enough. Exam questions often include tricky statements that require careful comparison. For example, a question may ask whether “only three substances remain in liquid state at 65°C”. Students must check every substance in the table instead of making quick assumptions.

Learning how to analyse these questions step by step helps students avoid careless mistakes and become a more confident learner in Primary Science. When facing challenging Science questions, students can also receive instant homework help and on-demand homework help through Superstar Teacher, where mentors guide them through difficult concepts and solutions.

Review the mentor-student conversation below to see how this melting point question can be solved clearly.