Which of the following is the only metal that is liquid at room temperature?

A. Nickel

B. Magnesium

C. Sodium

D. Mercury

What is hardest type of coal?

If you roll a ball down a ramp, which factor will have the greatest effect on the amount of friction created? (a) Force applied to the ball (b) Speed of the ball (c) Texture of the surface (d) Weight of the ramp

In which substance does sulfur have an oxidation state of + 4

A solute will probably dissolve best in a A. hot solvent B. cold solvent C. room temperature solvent D. temperature does not affect solubility

When 24.9 grams of ethane (C2H6) react with excess oxygen to produce carbon dioxide, the percent yield is 56.8%. What was the actual yield of the reaction? 2C2H6 + 7O2 4CO2 + 6H2O

Why is photosynthesis so important to plants, and can't animals use it?

One way the government of Kim Jong-il controls the lives of the people who live in North Korea is by a. requiring every citizen to vote. b. controlling information its people receive from the outside world. c. enforcing free trade with other nations.

Give reasons 1) copper utensils and sheets become blackish after some days

Predict the spontaneity of a reaction (and the temperature dependence of the spontaneity) for each possible combination of signs for? H and? S (for the system).

At 29°C, Kp = 5.3 ✕ 102 atm-2 for the following reaction. N2 (g) + 3 H2 (g) equilibrium reaction arrow 2 NH3 (g) When a certain partial pressure of NH3 (g) is put into an otherwise empty rigid vessel at 29°C, equilibrium is reached when 55.