Is popping popcorn a physical or chemical change? Explain your answers.

Which of the following setups would convert centimeters to feet?

Which statement is true of all rocks? (1) Rocks contain organic material. (2) Rocks contain fossils. (3) Rocks are composed of minerals. (4) Rocks are formed in layers.

If two atoms have a nucleus containing the same number of protons but a different number of neutrons, what is true? they are different isotopes of different elements. they are different elements but the same isotope.

Which 5.0-milliliter sample of NH3 will take the shape of and completely fill a closed 100.0-milliliter container? (1) NH3 (s) (3) NH3 (g) (2) NH3 (ℓ) (4) NH3 (aq)

A substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as (1) an ionic compound (2) a molecular compound (3) a metal (4) a nonmetal

How many protons and electrons does 0^2 - have?

How many ions form when 39 grams of calcium fluoride are added to excess water? a. 0.50 mol b. 1.0 mol c. 1.5 mol d. 3.0 mol

Which term specifically describes small chunks of rocks and debris in space that travel through the Earth's atmosphere and hit its surface? meteorites, meteoroids, meteors, meteorides

What is a covalent bond?

Which statement describes how the binary ionic compound CaCl2 is named? The nonmetal is named first, and the ending is replaced with - ide. The metal is named first, and the ending is replaced with - ide.