Describe the limitations of using models to represent atoms

A calorimeter weighing 123.7g has a quantity of 20C water added to it. The combined mass of the calorimeter + cold water is 198.3g. 61g of water is heated to 60C and is poured into the calorimeter.

A solid sample of a compound a liquid sample of the same compound are each tested for elecrical conductivity. Which test conclusion indicates that the compound is ionic?

A cell consists of a gold wire and a saturated calomel electrode (S. C. E.) in a 0.150 M AuNO 3 solution at 25 °C. The gold wire is connected to the positive end of a potentiometer, and the S. C. E.

You need to make 2.00 L of a calcium hydroxide solution with pH = 12.50. What mass of the solid must be dissolved? (Note: the solubility of calcium hydroxide is 1.

If 12.1 kilograms of al2o3 (s), 60.4 kilograms of naoh (l), and 60.4 kilograms of hf (g) react completely, how many kilograms of cryolite will be produced?

Which of the following could a magnet float over? A. A network solid B. A molecular solid C. A semiconductor D. A superconductor

What are genes a part of?

What is the mass (in grams) of 8.45 x 1023 molecules of dextrose: C6H12O6 (Mw. 180.16 g/mol) ?

How do the number and kind of atoms in the reactants compare to the number and kind of atoms in the products

Scientists conduct experiments to collect evidence. Which of the following is the best definition of the word experiment as used by scientists?