Which of these is a mixture

1) carbon

2) carbon dioxide

3) air

4) oxygen

I'm an experiment you are asked to react hydrolic acid with sodium hydroxide. When measuring the volume of the reactants, which instrument would give the greatest precision?

Which of the following elements will form an ion net charge of - 3 A. Aluminum B. Selenium C. Oxygen D. Phosphorus E. none of these

How many moles of hydrogen atoms are there in 1 mole of C6H12O6 molecules?

Which branch of chemistry involves the chemistry of carbon compounds?

Why will the crucible and its contents gain mass when heated?

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.