How is compound different from a mixture?

A. it is made of one substance

B. it cannot be made of organic materials

C. it cannot be broken down

D. it cannot be separated by a physical change

How does alternate freezing and thawing of water cause weathering to occur? Freezing chemically alters the rock surfaces Water expands when it freezes and cracks rocks open Thawing causes rock particles to move from place to place

Identify the period and group of the element that has the electron configuration 1s22s22p63s23p3. a. period 2, group 2A b. period 3, group 1A c. period 3, group 3A d. period 3, group 5A

What is the mass number of an ion with 108 electrons, 159 neutrons, and a 1 charge?

To what part of a plant does the stem sliver water and nutrients

Where does a wolf get energy from? Where does a rabbit get energy from? Where does a plant get energy from? Where does a mushroom get energy from?

Is it safe to take 450mg of Diphenhydramine Hydrochloride?

Which energy source produces carbon dioxide? a. plutonium b. uranium c. sunlight d. natural gas

Substance A and B are colorless, odorless liquids that are nonconductors and flammable. The density of substance A is 0.97 g/mL; the density of substance B is 0.89 g/mL. Are A and B the same substance? Explain your answer.

Describe what what food web is.

What are quarks and gluons made of?