Select the number of valance electrons for hydrogen

A.) 1

B.) 0

C.) 3

D.) 2

What happens to blood cells if there is too much sugar in the blood stream?

Which of the following statements about air masses is true? A. Air masses are areas of condensed water vapor, which are also known as clouds. B. Air masses are responsible for creating holes in the ozone layer. C.

Water drops forming on the outside of a cold glass is an example of which phase change

Reacts with air ... physical or chemical property; )

Which of the following is likely to be true about the ΔH for this reaction? C6H6 (l) → C6H6 (s) a. H < 0 b. H = 0 c. H > 0

A substance contains 36.1 percent calcium and 63.9 percent chlorine by weight. What is the empirical formula of the given compound? A. CaCl B. Ca0.9Cl1.8 C. CaCl2 D. Ca2Cl4

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