What is a substance that has mass and volume

What factors will be important win deciding the future use of energy resources

A sample of copper powder is heated in an evaporating dish using a Bunsen burner. If the mass of the powder in the evaporating dish increases after heating, this indicates that A. the copper must have combined with another substance. B.

Which of the following statements about the mechanism of the Diels-Alder reaction is true? A) Three pi bonds break; two sigma bonds and one pi bond form. B) Three pi bonds break; one sigma bond and two pi bonds form.

Which of the following items represents a chemical change? burning melting evaporation freezing The physical properties of a compound are similar to those of its elements. a. True b. False

What would be the resulting molarity of a solution made by dissolving 21.9 grams of KCl in enough water to make an 869-milliliter solution? Show all of the work needed to solve this problem.

What is the biggest challenge to carbon dating?

To make a 6.50M solution, how many moles of solute will be needed if 12.0 liters of solution are required

Compound made 3 + And 3-

Based on the law of conversation of mass, how does the mass of reactants compare with the mass of products in a given reaction?

How many grams of hydrogen are necessary to react completely with 50.0 g of nitrogen