Which are the following best describes topsoil

What statement applies to the horizontal rows or periods in the periodic table? A. The properties are all the same. B. The elements have the same number of electrons. C. The properties change going across each row. D.

Using the periodic table, complete the following element: Chlorine symbol: Cl2 Molecular weight: A. 35.45 B. 70.9 C. 70.90 Mass of one mole: A. 35.45 B. 70.90 C. 70.9

Lorsque la glace fond, la température de fusion est toujours à 0 degrés

In which of the following is light energy converted to electrical energy a bulb b battery c solar cell d oil lamp

What happens to the rate of reaction if you decrease the surface area of a substance?

A container with a volume of 3.46 liters contains a gas at a pressure of 1.30 atmospheres and a temperature of 274.27 Kelvins. How many moles of gas are in the container?

Benzene, C6H8, has an enthalpy of fusion = 10.19 kJ/mol. Calculate the amount of energy which is needed to change 88.0 g of solid benzene at 5.53°C into liquid benzene, also at 5.53°C?

What is the H3O + ion concentration of a solution that has an OH - ion concentration of 1.0 * 10^-3M? A) 1.0 * 10^-3M B) 1.0 * 10^-7M C) 1.0 * 10^-11M D) 1.0 * 10^-14M

Given the following chemical reaction: 2 O2 + CH4 CO2 + 2 H2O In the reaction of 6 moles of CH4 with excess oxygen, how many moles of water could be produced? 6 C 12.01 Carbon 1 H 1.01 Hydrogen 8 O 16.00 Oxygen A. 4 B. 6 C. 8 D. 12

Most mutagens have what kind of an effect on an organism?