Question

properties of matter / states of matter

1. define physical change (reference properties of matter)
2. define chemical change (reference properties of matter)
3. what are the 4 states (phases) of matter (reference states of matter)?

1.)
2.)
3.)
4.)

Explanation:

Question 17: Define Physical Change (reference Properties of Matter)

A physical change is a change in the form or appearance of a substance without altering its chemical composition. Examples include changes in state (like melting ice to water), size, or shape, where the substance remains the same chemically (e.g., cutting a piece of paper, freezing water). No new substance is formed.

A chemical change (or chemical reaction) occurs when a substance transforms into one or more new substances with distinct chemical properties. This involves breaking and forming chemical bonds, resulting in changes like color change, gas production, precipitate formation, or energy changes (e.g., burning wood, rusting iron). A new substance is created.

The four main states (phases) of matter are: 1) Solid (definite shape and volume, closely packed particles), 2) Liquid (definite volume, indefinite shape, particles slide past each other), 3) Gas (indefinite shape and volume, widely spaced particles), and 4) Plasma (ionized gas, high energy, found in stars/lightning).

Answer:

A physical change is a change in a substance's form/appearance (e.g., state, size, shape) without altering its chemical composition (no new substance formed, e.g., melting ice, cutting paper).

Question 18: Define Chemical Change (reference Properties of Matter)