238 U 92 is an isotope notation. what is the atomic number, mass number, number of protons, and number of neutrons?

Solid state transformation?

Determine what mass of sodium nitrite, NaNO2, would be required to prepare a buffer, Buffer A, with a pH of 3.13 from 50.0 mL of 1.0 M nitrous acid, NaNO2. The Ka and pKa for nitrous acid is 4.0 x 10-4 and 3.40 respectively.

All of the following statements about silicon are true

How many liters of water can be boiled by burning 1 kg of propane? Round your answer to the nearest whole number.

A substance whose shape can easily change is a a. solid. b. powder. c. fluid. d. metal.

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.

Altering the pressure of a system can affect the rate of a chemical reaction. true false

What does ice cream melt on a hot day which type of thermal energy transfer does this melting represents