Which of the following items represents a chemical change? burning

melting

evaporation

freezing

8. How does the arctic fox survive the harsh winters in the tundra? O A It feeds on large amounts of mosses, lichens, and insects. B It feeds on animals that it captured during the summer and then stored underground.

Insoluble compounds in a chemical reaction are called?

Many dinosaur bones are radioactive. Because of this, they are usually painted over with lead paint. Postulate A reason for why some of these very old fossils would have a radioactive signal and where it might be coming from?

If the chemical analysis of a 10.000 g sample of oil of wintergreen shows that it consists of 6.320 g of carbon, 0.530 g of hydrogen, and 3.16 g of oxygen. What is the simplest formula for oil of wintergreen?

What is the number of protons in the nucleus of an atom equivalent to? a. number of neutrons b. atomic number c. mass number d. atomic weight

A substance is considered to have a smaller surface area when ... A. it is a fine powder B. it is in large chunks C. you have a small amount of the substance D. you have a large amount of E. the substance

Which is the noble gas notation for chlorine? A-[Ne] 4s2 4p5 B-[Ne] 3s2 3p5 C-[Ne] 3s2 3p3 D-[Ne] 3p2 3p5

Is argon long hand or noble gas

Lithium, beryllium, and boron are elements with atomic number 3, 4, and 5, respectively. Even though they are three of the five simplest elements, why are they rare compared to many heavier elements?

What is the formula equation for: Copper (II) Sulfate Pentahydrate - > Copper (II) Sulfate + Water?