A sample of hydrated calcium sulfate has a mass of 2.643 g. After dehydration, the sample has a mass of 2.090 g. What is the percent by mass of water in the hydrate?

Suppose you have two 100-mL graduated cylinders. In each cylinder there is 40.0mL of water. You also have two cubes: one is lead, and the other is aluminum. Each cube measures 3.0cm on each side.

What information could you use to determine the atomic number of an unknown element that has a mass number of 22? O A. number of ions B. number of isotopes C. number of neutrons O D. number of electrons

Jasper and gemma are going to play on a teeter totter. gemma gets on first. when jasper gets on gemma moves into the air but she does. not. move to the top. which statement would correctly explain the forces acting on the teeter totter

What causes the distinctive swirling shape of a hurricane?

The heat of fusion of a compound is 333.6 joules per gram

The table below shows the shapes of two samples, C and D, when placed in three containers of different shapes.

How many grams of KCl are produced when 60 grams of K are reacted?

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How do compounds affect an atom's stability

You need to make 10 mL of 2 mg/ml solution of protein and you have 25 mg/mL solution. How much protein solution and water do you need to mix in order to make the required solution?