Question

15 multiple choice 1 point which statement correctly describes the difference between a physical change and a chemical change? a physical change creates a new substance; a chemical change only changes appearance. chemical changes can be reversed by simple physical means; physical changes cannot. physical changes always release energy; chemical changes never do. a physical change changes the substances form without making a new substance; a chemical change produces one or more new substances. clear my selection

Explanation:

• Option 1: A physical change does not create a new substance. A chemical change creates a new substance. So this option is wrong.
• Option 2: Chemical changes are not reversible by simple physical means. Physical changes can often be reversed (e.g., melting of ice can be reversed by freezing). So this option is wrong.
• Option 3: Physical changes do not always release energy (e.g., melting of ice requires energy input). Chemical changes can release or absorb energy. So this option is wrong.
• Option 4: A physical change changes the form (e.g., state - solid to liquid) without making a new substance. A chemical change produces new substances (e.g., burning of wood to form ash, carbon - dioxide etc.). This option is correct.

Answer:

A physical change changes the substance's form without making a new substance; a chemical change produces one or more new substances.