1. a substance that is changed during a chemical reaction is called
2. matter cannot be created or__
in a chemical reaction.
3.
takes place during the formation of rust.
4. increasing surface area of a reactant
- the speed of the reaction.

The point along a planet's orbit where it is closest to the sun is called the

Use the drop-down menus to label each of the following changes p for physical change and c for chemical change. the substance changes to a new substance. the original substance can be recovered. the color changes. gas is produced and given off. the substance changes size, shape, or volume.

How many moles are in 7.2 x 10^23 carbon molecules?