True or False - when setting up your conversion problems every numerical value must have a unit on it.

Which is not one of the eight most common elements in earths continental crust

When dissolving a solid or liquid, as the temperature of the solvent increases, the rate of dissolution a. increases. b. decreases. c. stays the same. d. either increases or decreases, depending upon the liquid.?

A combustion analysis of a 0.503 g sample of an unknown hydrocarbon yields 1.53 g CO 2 2 and 0.756 g H 2 2 O.

Which of the following equations are balanced? CO + 3H2 - -> CH3OH PCl3 + 2Cl2 - -> PCl5 2KClO3 - -> 2KCl + 3O2 Mg + N2 - -> Mg3N2

Are all organisms multicellular

A sample of bismuth weighing 0.687 g was converted to bismuth chloride by reacting it first with HNO3, and then with HCI, followed by careful evaporation to dryness. The mass of the bismuth chloride obtained was 1.032 g.

When 1 g of sodium chloride (NaCl) is placed in 100 g of water, a solution results. Once the solution is prepared, water is now considered what part of the solution?

1. How is pressure affected as depth increases? 2. As the sun heats the surface of the oceans, two layers of water result. What separates the layers? 3. How is temperature affected when? (a) the depth increases (b) the latitude increases 4.

Are nails in a jar with water a chemical change

What is the molarity of a solution composed of 4.73 g of potassium iodide (KI) dissolved in enough water to make 0.169 L of solution? Answer in units of M.