Describe the composition of the nucleus of an atom.

A) It is composed of protons.

B) It is composed of protons and neutrons.

C) It is composed of protons and electrons.

D) It is composed of protons, neutrons, and electrons.

What could your family do to decrease the amount of trash you throw away?

Which part of a helium atom is positively charged

A weak acid, HA, has a pKapKa of 4.3574.357. If a solution of this acid has a pH of 4.0054.005, what percentage of the acid is not ionized? Assume all H+H + in the solution came from the ionization of HA.

If we're interested in knowing the rate at which light energy is received by a unit of area on a particular surface we're really trying to figure out the

Which correctly summarizes the trend in electron affinity? it tends to be very high for group 2. it tends to be more negative across a period. it tends to remain the same across periods. it tends to be more negative down a group?

What is released in the process of an atom moving from an excited level to a lower energy level?

Which two properties are characteristic of ionic compounds?

explain why the hydrogen atoms in a hydrogen gas molecule form nonpolar covalent bonds but the oxygen and hydrogen atoms in water molecules form polar covalent bonds

The equation 2 N O 2 in equilibrium with N 2 O 4 represents a system,

How does the calorie compare to the metric unit the joule? How do you calculate a calorie? Is it the same for all types of food?