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Force and Motion WK5
Question | Answer |
---|---|
Chemical | an element or compound |
Chemical change | a process that changes substances into new substances |
Physical reaction | a change in matter that does not affect its chemical composition |
Chemical reaction | a chemical change; a process that changes substances into new substances |
Acid | any substance with a pH less than 7; acids turn blue litmus paper red |
Atom | the smallest unit of an element that has the properties of that element |
Matter | material that has mass and takes up some amount of space |
Compound | a chemical combination of two or more elements |
Molecule | two or more atoms joined together |
Element | a pure substance that cannot be broken down into simpler substances by chemical reactions |