Question

Use the drop-down menus to identify the types of properties described. Kerosene was commonly used in lamps because it burns easily. The element nickel has a boiling point of 2,913°C. Copper is used to make electrical wire because it is a good conductor. Cesium produces an explosion when it is added to water. Hydrogen is the least dense of all elements.

Answer 1

Answer: Kerosene was commonly used in lamps because it burns easily: Chemical property : It undergoes change in chemical composition and produces carbon dioxide and water.

The element nickel has a boiling point of 2,913°C: Physical property: There is no change in chemical composition and only the state changes from liquid to gas.

Copper is used to make electrical wire because it is a good conductor: Physical property: there is involvement of electrons and no change in chemical composition

Cesium produces an explosion when it is added to water: Chemical property: It undergoes change in chemical composition

Hydrogen is the least dense of all elements : Physical property: There is no change in chemical composition and hence a physical property.

Explanation: Chemical property is defined as properties in which arrangement of atoms present in the substance changes and leads to formation of new substance.

Physical property is defined as properties which leads to change in shape, size or state of the substance and does not involve formation of new products.

Answer 2

The properties listed are both physical and chemical.

Physical property:

• The element nickel has a boiling point of 2,913°C.
• Copper is used to make electrical wire because it is a good conductor.
• Hydrogen is the least dense of all elements.

Chemical property:

• Kerosene was commonly used in lamps because it burns easily.
• Cesium produces an explosion when it is added to water.

A physical property refers to the properties of a material that do not lead it to changing its atomic structure such that it becomes a new substance. Rather it concerns changes in state, size and shape.

The boiling point will lead to a change in state and so is physical. Being used to make wire means a change in shape so that is physical as well. Being the least dense concerns volume and mass and so is physical.

A chemical property on the other hand, will lead to a change at an atomic level such that a new substance is formed.

When kerosene is burnt and cesium explodes in water, new substances are formed so these are chemical properties.

In conclusion, there are both physical and chemical properties of various materials with the chemical properties leading to substance change as opposed to the physical.

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