chemical

Connected with substances and the ways they change when they mix or react.

• A chemical reaction produced heat.
• Scientists tested the water for chemical changes.
• Do you know the chemical formula for salt?

Common phrases: chemical reaction, chemical formula, chemical change, chemical composition

A substance with a particular makeup, often used in science, farming, cleaning, or making things.

• Wear gloves when handling this chemical.
• The factory stores chemicals in locked rooms.
• Which chemical caused the water to change colour?

Similar words: substance

Common phrases: dangerous chemical, chemical spill, industrial chemical

A substance made by people rather than taken directly from nature.

• I avoid harsh chemicals in my garden.
• This cleaner contains no synthetic chemicals.
• She prefers natural dyes to chemicals.

Similar words: synthetic substance

Common phrases: synthetic chemical, harsh chemical, chemical additives