Which of the following best describes a mole as used in chemistry?

A a simplification of mathmatics

B a salt dissolved in water

C a very large number of objects

D a measure of concentration

The following volumes of solution are combined in a test tube: 2.00 mL of 0.20 M potassium iodide 1.00 mL of 1% starch 0.50 mL of 0.20 M ammonium persulfate 0.50 mL of 0.012 M sodium thiosulfate 2.00 mL of 0.20 M potassium nitrate 2.00 mL of 0.

One of the steps in the commercial process for converting ammonia to nitric acid is the conversion of NH3 to NO: 4NH3 (g) 5O2 (g) - -> 4NO (g) 6H2O (g) In a certain experiment 2.00 g of NH3 reacts with 2.50 g of O2. Which is the limiting reactant?

An electric current is flowing through the cord below. What will happen to this current if a magnet is brought near the cord? A. It will exert a force on the electric current. B. The resistance of the wire will decrease. C.

Jose gets up from his seat on the bus to move closer to the front. Just as he begins to walk forward, the bus stops at a light.

A 40.0 L balloon is filled with air at sea level (1 atm @ 25 oC). It is then tied to a rock and thrown into a cold lake and it sinks to the bottom! When it reaches the bottom of the lake the temperature is 4.

Which of the following statements is true of enzymes? A. they change shape after a reaction B. They don't provide an active site for substrates to bind in a reaction C. They're unusable after a reaction D.

How many moles of NaCl are present in 530 ml of a 1.52m NaCl solution

How much can 97 go in to 15

What is the predicted products for Ag+CuSO4

What happens to the carbon atoms lost during respiration?