The atomic number of boron is 5. what is the mass number of a boron atom with 4 neutrons?

The pH of a strong base is 12.2 at 25 degrees. what is its hydroxide-ion concentration?

What is an ionic bond? How is an ionic bond done?

The term "precision" BEST refers to which of the following? A) whether or not a measurement is correct B) how "close together" a seat of measurements is C) whether or not a tool for making measurements is useful D) how close a measurement is to an

Use the oxidation rule to determine the oxidation number of carbon in H2CO3

A mountainous region would be a likely source for nuclear or hydroelectric or wind energy

The density of HCN (hydrogen cyanide) gas at STP is 1.21g/L. What volume will 100.0g of HCN occupy at STP? A) 121 L B) 0.012 L C) 82.6 L D) none of the above

A 20.0 ml sample of 0.150 m ethylamine is titrated with 0.0981 m hcl. what is the ph after the addition of 5.0 ml of hcl? for ethylamine, pkb = 3.25

Some polymers are elastic because they are made of a. carbon. c. sugar and alcohol. b. phosphate ladders. d. cross-linked chains.

The hot converting blank is the layer of rock between the earths crust and core

Compare the compressibility of gases and liquids. Support your answer by describing the arrangement of particles in gases and liquids.