The atomic mass of hydrogen-1 is 1.008 and the atomic mass of helium-4 is 4.003. Find the difference in grams between 4 moles of hydrogen and one mole of helium.

If you have 30 bicycle frames and 40 bicycle wheels, how many bicycles will be made? what limits the number of bicycles?

Compare diameter of magnesium, calcium, strontium, and barium atoms. What is the relationship between the elements' atomic numbers and diameters of their atoms? Why?

The correct answer is c. Energy processing from corn biofuels is not energy efficient.

A sample of methane gas occupies 4.50 gallons at a temperature of 80.0 F. If the pressure is held constant, what will be the volume of the gas at 100. degrees C?

Find an equation of a line through (-2,-3) with m=1/2

You are given 10.00 mL of a solution of an unknown acid. The pH of this solution is exactly 2.36. You determine that the concentration of the unknown acid was 0.3535 M. You also determined that the acid was monoprotic (HA).

What mass of copper is consumed in the reaction with hydrochloric acid if 10.0 g of gas is collected?

How does the movement of molecules inside a solid block of iron change as the iron is heated? The molecules move faster. The molecules move slower. The molecules stop moving completely. The molecules move in the same way at all temperatures.

Read the following passage: The movement of tectonic plates buries a rock deep inside Earth. Intense heat and pressure change the mineral composition of the rock and transform it into Rock A.

What is a change which forms one or more new substances?