How can you make results of an investigation more reliable?

How long will it take for 100 grams of a substance with a half life of 2 years to decay to a mass of 50 grams?

A gaseous sample of nitrogen contains 2.41 grams (0.086 mol). What volume does this mixture occupy at 28 °C and 1.05 atm of pressure? Hint = Be sure to convert to Kelvin first! 0.19 L 0.38 L 1.8 L 2.0 L 4.0 L

Consider just the first sentence of this multistep word problem. Sentence 1: The sum of the ages of a brother and sister is 26. Give an equation that represents this statement using b as the age of the brother and s as the age of the sister.

Solids are usually more dense than: 1. gases 2. liquids 3. plasmas 4. all of the above

When the ideal gas law constant 0.0821 is used, what unit of pressure should be used in the ideal gas law calculation?

Use the periodic table to determine the number of protons in an atom of arsenic (as)

Which of the following is a strong electrolyte. sugar, sodium chloride, honey vinager, carbon tetrachloride?

How do rockets work? What chemicals are used and what reactions happens with those chemicals to make a rocket fly?

The solubility of iron (ii) hydroxide, fe (oh) 2, is 1.43x10-3 gram per liter at 25oc. a. write a balanced equation for the solubility equilibrium

A substance undergoes change. Which Of the following indicates that the change was a chemical change? a. the substance changed state. b. the molecules of the substance changed c. the substance changed shape. d. the density of the substance changed.