An ion has a charge of - 1. Which of the following electron

arrangements could form an ion with this charge?

2,8

2,8,7

2,1

2.8

In a reaction, 25 grams of reactant AB breaks down into 10 grams of product A and an unknown amount of product B. Using the law of conservation of mass, how much does product B weigh? a. 25 g B. 10 g С.

Which of the following could result from a substance that undergoes a physical change? A. It changes irreversibly. B. It undergoes phase change. C. It's elements composition is altered. D. its atoms rearrange to form a new molecule.

Imagine following a single carbon atom through the carbon cycle. Which of the following is a possible path for the carbon atom to take? A. The atmosphere; a plant; an herbivore; another plant; then back to the atmosphere. B.

Oxygen has an atomic number of 8. What is the approximate atomic mass of an oxygen atom in daltons (Da) ?

The incomplete table below shows selected characteristics of gas laws. Name Variables Constants Equation ? ? ? PV = k Charles's law ? ? V = kT ? Temperature, pressure ? P = kT Combined gas law Pressure, temperature, volume ? ?

A stack of books are sitting on the table. Which force is pulling it down? A. Buoyant force B. Pressure force C. Gravitational force

Can some one explain what solubility means? I really do not get it and we have a sub for the next week

The atomic number of an atom identifies the number of protons in its nucleus. If the overall charge on the atom is neutral, what must the atomic number also identify? A. the most common isotope's mass B.

A solution containing 2.8 moles of magnesium bromide is combined with a solution containing excess potassium carbonate. This chemical reaction takes place: MgBr2 (aq) + K2CO3 (aq) → MgCO3 (s) + 2KBr (aq). If the volume of the resulting solution is 1.

A cylinder contains oxygen at a pressure of 10.0 atm and a temperature of 300.0 K. The volume of the cylinder is 10,000 mL. What is the mass of oxygen gas?