Which number contains four significant figures? A) 3.978 B) 0.780 C) 0.0085 D) 1700 E) Two or more of the above numbers contain four significant figures

What is the difference between a mixture and a compound? (need an easy two sentence answer (able to explain it to a 8 your old).)

The different forms of a gene; could be dominant or recessive

Sodium is an atom represented as na+. what does the "+" represent?

Sodium oxide contains Na + ions and O2 - ions. Give the formula of sodium oxide

Arrange the compounds in order of decreasing solubility in water. a) 1-butanthiol b) 1-butanol c) 1,2-propanediol Answer by ordering the letters a-c as a string, e. g. acb, starting with the compound of highest solubility.

What defines a material as being a mixture?

What do igneous rocks form from? (20pts!)

A gas at STP has a volume of 1.0 liter. If the pressure is doubled and the temperature remains constant, the new volume of the gas will be ... ?

Combustion analysis of toluene, a common organic solvent, gives 8.20 mg of co2 and 1.92 mg of h2o. if the compound contains only carbon and hydrogen, what is its empirical formula?

Why does the moon have phases? What are the four main phases of the moon? How long does it take to change from one to another?