An element has a half-life of 30 years. if 1.0 mg of this element decays over a period of 90 years, how many mg of this element would remain?

Bethany has a fish tank at her house. She uses the following data table to keep track of the nitrate and phosphate levels in the tank. Month Nitrates Phosphates January 8.0 mg/L 0.010 mg/L February 8.1 mg/L 0.010 mg/L March 7.9 mg/L 0.

If you have a pH of 3.35, what is the hydrogen ion concentration of the solution?

The elements of which group are nonreactive? halogens alkaline earth metals noble gases alkali metals

4. Place the following orbitals in order of increasing energy: 1s, 3s, 4s, 6s, 3d, 4f, 3p, 7s, 5d, 5p

Give the characteristic of a first order reaction having only one reactant. give the characteristic of a first order reaction having only one reactant. the rate of the reaction is proportional to the square root of the concentration of the reactant.

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.