Match the grams of each element or compound to the corresponding number of moles of that element or compound.

1. 20.0g H 0.011 moles

2. 0.50 g Na 20.0 moles

3. 2.0 x 102 mg H2O 0.022 moles

Which of the following reactions represents an exothermic reaction? A. NH3 (g) + 12.0 kcal → ½N2 (g) + 3/2H2 (g) B. CH4 + 2O2 → CO2 + 2H2O + 212,800 cal C. C + 2S → CS2, ΔH = 27,550 cal D. C (graphite) → C (diamond), ΔH = 0.45 kcal E.

Select all that apply. Select all the items that are public goods or services. roads education military police force

How reactive is an atom of Sodium (na) and why?

Is the electronegativity of argon greater than sodium?

What is the half-life of a radioisotope if a 40 g sample becomes 10 g after 20 minutes?

Four properties of water are listed. 1. It is colorless and odorless in its pure form. 2. It reacts with metals to form metal hydroxide and hydrogen gas. 3. When heated to 100 °C, water evaporates. 4. It decomposes to form hydrogen and oxygen.

Water is A. Acidic B. Basic C. Neutral

What variables affect the acceleration of an object and in what manner do they affect the acceleration?

How do valence electrons relate to the chemical reactions of an element?

What is the weighted-average mass of all known isotopes for an element