What do scientists use to describe chemical reactions?

a. laws and theories

b. synthesis

c. the conservation of matter

d. chemical equations

What is the density of carbon dioxide at stp? 46.0 g/l 22.0 g/l 5.09 * 10-1 g/l 1.96 g/l?

Write electron configurations for the elements that are identified by these atomic numbers a. 15 b. 12 c. 9 d. 18

Which of these four liquids is a mixture, made up of parts, some of which can be separated by flirtation? a. Salt water b. Skimmed milk c. Orange juice with pulp d. Distilled water

Polycarbonate plastic has density of 1.2g/cm cube

An atom has six electrons in its valence shell. how many single covalent bonds would you expect it to form in most circumstances?

What type of process occurs when solidified wax is converted to liquid wax on heating? endothermic exothermic decomposition reversible disintegration

Density is not a physical property of mass. True False

Does skin have a nucleus true or false

Bacteria are only found in decaying matter. A. True B. False

Which is considered a chemical mutagen? tanning beds tobacco X-rays precious metals