A helium atom has 2 protons and 2 neutrons. what is the mass number of this atom?

What method of energy transfer is the main cause of weather

What is the difference between a subsurface and a surface event? List an example of each from the rock cycle.

At 25.0 ° C, a 10.00 L vessel is filled with 5.25 moles of Gas A and 7.05 moles of Gas B. What is the total pressure?

How many grams C3H7OH can be made by reacting with 7.3L of CO2 at STP

what is the molarity of a solution made by dissolving 21.2 g of sodium hydroxide in enough water to make 7.92 L of solution

Chemical reactions that release energy possess reactants with lower energy than their products. True or False Heat is the most common form of energy absorbed or released in chemical reactions. True or False

What is the reason for the low solubility of LiF (0.27 g per100 ml H2O) compared to CsF (367 g per 100 ml H2O) ?

Which of the following changes will decrease the total amount of gaseous solute able to be dissolved in a liter of liquid water? A.) increasing temperature B.) increasing pressure C.) decreasing surface area D.) decreasing temperature

In June there are fewer hours of daylight and less direct sunlight in the

What are two type of minerals?