What was a shortcoming of Democritus's description of the atom?

P. ermanent hardness of water can be removed by what? ( a. adding slaked lime. ( b. boiling. ( c. adding caustic soda. ( d. filtration

State each of the following statement true or false? A. A carbon atom can form up to four covalent bonds. B. A carbon atom has six electrons in its outermost shell. C. The bond between a carbon and hydrogen atom is a polar bond. D.

Which of the following is not true regarding an acid? a. can donate a proton (H+) to some other substance b. can accept a proton (H+) from some other substance c. releases hydrogen ions (H+) when dissolved in water d.

Suppose you are digging a hole in the ground. You notice that the soil is in two layers. Each layer has particles of different sizes.

Calculate the number of joules released when 72.5 grams of water at 95 degrees Celsius to a final temperature of 28 degrees Celsius

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.