Calculate the pH of a buffer that is 0.205M in NaHCO3 and 0.285M in Na2CO3.

What is the density of a rock with a mass of 100kg and a volume of 25mL

Which of the following best explains why electrometallurgy is a useful process in many industries? A.) Electrometallurgy can etch permanent marks and designs into the surfaces of metal products. B.

A student placed 3.0 grams of Mg into some HCl in two different experiments. In each case, it reacted according to the following equation: Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g).

1. If 22.5 L of nitrogen at 1.25 atm are compressed to 2.10 atm at constant temperature. What is the new volume?

What is the largest mass that can be measured in the balance

The harder you strike a drum, the greater the sound's A) medium B) volume C) frequency D) pitch

The equation X + Y 2Z has the rate law equation shown below. Which of the following statements best describes the relationship of X on the rate of the reaction? rate = k[X]2[Y] Changing X has no effect on the reaction rate.

What moves in or out of a substance during a change of state?

2.5 moles of sodium chloride is dissolved to make 0.050 liters of solution

2. The minimized structure of phenacetin is planar, and the chemical shifts of the aromatic protons in the NMR spectrum can be rationalized by electron delocalization.