Question

Copper is used to make electrical wire because it is a good conductor.
Physical or chemical
Cesium produces an explosion when it is added to water.
Physical or chemical
Hydrogen is the least dense of all elements.
Physical or chemical

Answer 1

1. Copper is used to make electrical wire because it is a good conductor. - **Physical** (This statement describes a physical property of copper.)

2. Cesium produces an explosion when it is added to water. - **Chemical** (This describes a chemical reaction between cesium and water.)

3. Hydrogen is the least dense of all elements. - **Physical** (This statement describes a physical property of hydrogen.)