Pupil sheet · Elements, compounds and mixtures
Elements, compounds and mixtures — return questions
Name ______________________ Date ____________
Use one to two weeks after the lessons. Keep the notes and the lesson closed.
1. identify
Keep the lesson closed. Two elements react to form a compound. Which row describes the compound, and not a mixture of the same two elements?
| Row | Its properties | Proportions of its elements | Can be separated into its elements by |
|---|---|---|---|
| A | new, unlike those of its elements | always the same | only a chemical reaction |
| B | new, unlike those of its elements | any proportions | only a chemical reaction |
| C | the same as those of its elements | always the same | only a chemical reaction |
| D | new, unlike those of its elements | always the same | a physical method |
Circle one answer.
- A
- B
- C
- D
2. explain
Keep the lesson closed. A particle diagram of the gas inside a laser shows single helium atoms and single neon atoms. Explain why the gas is a mixture, and not an element or a compound.