Which of the following sets represents a pair of isotopes?

A. 14C and 14N

B. Br and Br2

C. 9B and 11B

D. 16O and 16O2-

Why are the trends and exceptions to the trends in ionization energy observed? Check all that apply. Ionization energy tends to increase down a group because the electrons get farther away from the nucleus.

What does a scientist observe in a chemical's reaction rate?

Which of the following is a measurement of an object's mass? O 10 millimeters O 10 kilograms 10 newtons O 10 grams per cubic centimeter

Which of the following best explains why air is considered a natural resource?

When 0.610 g of titanium is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25.00 °C to 50.50 °C. In a separate experiment, the heat capacity of the calorimeter is measured to be 9.84 kJ/K.

Why should your disposal of excess magnesium take place in a fume hood? (choose all that apply) Group of answer choices The quench released hydrogen gas, which is flammable and explosive The quench is highly exothermic and might cause the solvent to

For the chemical equation SO2 (g) + NO2 (g) SO3 (g) + NO (g) SO2 (g) the equilibrium constant at a certain temperature is 3.00. At this temperature, calculate the number of moles of NO2 (g) that must be added to 2.30 mol SO2 (g) in order to form 1.

What Happens To The Energy That Does Not Come Into Contact With The Bottom Of My Pan? Topic: Energy

What state of matter has a definite shape but indefinite volume?

1) What is the electron configuration of an electrically neutral atom of sodium? 2) What is the electron configuration of an electrically neutral atom of neon? 3) What is the electron configuration of an electrically neutral atom of oxygen?