Chemistry exam preperation.....?

Question

Some types of weathering involve breaking up rok by agents such as roots or ice. What type of change is involved in this type of weathering? A) physical change B) chemical change C) both or d) neither
Other types of weathering invovle the breaking down of rock by agents such as acids in rain, in groundwater, or released by certain plants. What type of change is invovled in this type of weathering?A) physical change B) chemical change C) both or d) neither
Certain sedimentary rocks are considered to be chical sedimentary rocks. One type of chemical sedimentary rock is formed when water evaporates, leaving a type of rock formed from salts that were dissolved in the water. what type of chang is involved in forming this type of chemical sedimentary rock? A) physical change B) chemical change C) both or d) neither
Melting, cooling, and crystallization are internal processes observed in the rock cycle. What type of change is each of the processes?

Answer 1

Any change that produces one or more new substances that have different properties is a chemical change.

Any change that does not produce a new substance with different properties is a physical change. Examples of physical changes are tearing paper into smaller pieces (its still paper); grinding peppercorns in a peppermill (its still pepper); phase changes (solid to liquid to gas); evaporation.

Good luck with your exam.

Answer 2

class of '08 rocks!!!!!!!!!



rock on!!!!!