Which number most likely represents the first ionization energy, in kilocalories per mole of atoms, for a nonmetallic element?

1.96

2.138

3.194

4.239

What is the mass number of an atom of copper that has 36 neutrons?

sample of copper (II) sulfate pentahydrate, CuSO4⋅5H20, is heated to remove the water of hydration from the crystals. The mass of the original sample before heating was 50.00 grams. If the mass of the cool, dry sample after heating is 34.

The value of acceleration due to gravity (g) on Pluto is about 0.61 meters/second2. How much will an object that weighs 250 newtons on Earth weigh on Pluto? Note that the value of acceleration due to gravity on Earth is 9.8 meters/second2

Question 5 a + 3 cation of a certain transition metal has three electrons in its outermost d subshell. which transition metal could this be? shade all the possibilities in the periodic table outline below.

Which of the following processes has an increase in entropy? A) Boiling a pot of water B) Freezing a sample of water C) Filtering sand out of a sample of water D) Synthesizing water from hydrogen and oxygen

How does a solid differ from a liquid? b. how does a liquid differ from a gas? c. how is a liquid similar to a gas? d. what is a plasma?

Which pair of elements will form an ionic bond? N and O K and Br C and Cl Fe and Ni

What does mass is conserved in a chemical reaction mean

Which atom has a nucleus that contains 13 protons and 14 neutrons 1. Mg 2. Be 3. Al 4. N

Determine the oxidation state of the metal ion in [co (nh3) 5br]2+. express your answer as an integer.