why are the units used to express the densities of gases different from those used to express the densities of solids or liquids

What is a qualitative observation

How many neutrons are in a nucleus of uranium-238? A. 92 B. 145 C. 238 D. none of these

What is Characteristic of a mineral A. It must be Amorphous and have a definite chemical composition B. It must be Amorphous and have a indefinite chemical composition C. It must be crystalline have a indefinite chemical composition D.

A strong magnet that can be turned on and off is called a electromagnet. True or false?

AgNo3+Cu->Cu (No3) 2+Ag

1. According to the article, which country may have a greater population than China by the year 2050? A. China B. Kenya C. India D. Germany 2. What does the article list as one reason that drives couples in India to have more children? A.

How are the relationships of elements in a group different from the relationships of elements in a group

How many nitrate ions are in 387.4 grams of calcium nitrate?

Tin or silver more reactive

Chemical reactions that release energy possess reactants with lower energy than their products. True or False Heat is the most common form of energy absorbed or released in chemical reactions. True or False