Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition, such as cutting, folding, or melting.

Front

What is a chemical change?

Back

A chemical change is a process that involves the transformation of one or more substances into different substances, indicated by changes in color, temperature, or the formation of gas.

Front

What property allows sand and gravel to be separated using a sieve?

Back

The size of the particles allows sand and gravel to be separated, as sand can pass through the holes while gravel cannot.

Front

What observation indicates a chemical change has occurred when heating a solid?

Back

A change in color, such as a white solid turning amber, indicates that a new substance has formed.

Front

What does it mean when a substance becomes warm after mixing?

Back

It indicates that a chemical reaction has occurred, producing a new substance and releasing heat.

Front

Define 'substance' in the context of chemistry.

Back

A substance is a particular type of matter with specific properties that can be identified and classified.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

Front

Give an example of a physical change.

Back

Examples of physical changes include melting ice, dissolving sugar in water, or breaking a glass.

Front

What are indicators of a chemical change?

Back

Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

Front

What is meant by 'mixture' in chemistry?

Back

A mixture is a combination of two or more substances that retain their individual properties and can be separated by physical means.