properties and changes Flashcards
what is a physical property?
characteristics of matter than can be observed or measured
what are the 2 types of physical properties?
qualitative, quantitative
what is qualitative?
description of the substance
what is quantitative?
measurement of a substance involving a number and unit
what are 3 clues to a physical change?
- any change unrelated to the substance’s chemical identity
- the substance remains the same at the atomic level
- no new substances are formed
what are 3 clues of a new substance?
- change of state
- change of form
- dissolving
what is a chemical property?
describing how matter reacts or changes when it is exposed to other substances or heat or light
what are 3 things a substance may react with?
- water
- acid
- air
what are 3 things a substance is that gives it a chemical property?
- explosive
- toxic
- corrosive
what are 4 clues of a chemical change?
- a new colour appears
- a gas forms (bubbles, smoke, invisible but new odour)
- a precipitate forms
- energy is released or absorbed
what is a precipitate and how is it identified?
a solid that forms when two solutions are mixed; it can be recognized because the mixture turns cloudy
what 4 things can energy be in the form of?
heat, light, electricity, sound
