How many neutrons does an element have if its atomic number is 40 and its mass number is 154

How much heat energy in kilojoules will be absorbed or released if 8.93 grams of ammonia is produced

Mixing Strong Acids with Strong Bases What is the pH of the solution that results from mixing 8.00 mL of 0.030 M perchloric acid with 28.00 mL of 0.

the number of joules needed to raise the temperature of 10 grams of water from 20 degrees celsius to 30 degrees celsius is

A rock weighing 32.0 g is placed in in a graduated cylinder displacing the volume from 22.3 mL to 27.6 mL. What is the density of the rock in grams/cubic centimeter?

Of these electromagnetic waves, which has the ... longest wavelength greatest energy?

Just as earth moves around the sun, the moon revoles around the earth. About how many earth days does it take for the moon to travel around the earth?

Which of these is a characteristic of science? Its results cannot be generalized. Its findings are usually kept a secret. It follows a clearly laid out methodology. It is based on beliefs and preferences of scientists.

23491pa undergoes beta decay. what is the mass number of the resulting element?

What is the Mass in grams of 3.1 mol of mercury

A helium balloon contains 0.48 g of helium. Given the molecular weight of helium is 4.0g/mol, how many moles of helium does it contain?