Which element is a metalloid? 1. Al 2. Ar 3. As 4. Aa

The atomic number of an atom identifies the number of protons in its nucleus. If the overall charge on the atom is neutral, what must the atomic number also identify? A. the most common isotope's mass B.

A driver with a nearly empty fuel tank may say she is "running on fumes." If a 15.0 gallon automobile gas tank had only gasoline vapor remaining in it, what is the farthest the vehicle could travel if it gets 20.

What is always conserved in a chemical reaction? A. Mass is always conserved in a reaction. B. Energy is always conserved in a reaction. C. Mass and energy are both conserved. D. Nothing is always conserved in a reaction.

What is incomplete combustion in chemistry for types of reactions?

Refrigerators make use of the heat absorption required to vaporize a volatile liquid. a fluorocarbon liquid being investigated to replace a chlorofluorocarbon has a molar heat of vaporization of 26 kj/mol at 250 k and 750 torr. calculate

The trend for ionization energy is a general increase from left to right across a period. However, magnesium (Mg) is found to have a higher first ionization energy value than aluminum (Al).

A man is about to receive a bone marrow transplant. He is taking pills to suppress his immune system so that: A. his immune system does not attack the transplanted marrow. B. his immune system can recover after surgery. C.

Nickel (ii) chloride dissolves in water to form a light green solution. what ions are present in solution-that is, what is "swimming around" in the aqueous solution? write the formulas

Calcium sulfide forms when calcium loses 2 valence electrons to sulfur. What type of a bond is formed? Select one of the options below as your answer: A) covalent B) ionic

What ability is most valuable for survival in the deep ocean