Which of the following is made of matter?

A. Energy

B. Heat

C. Light

D. The sun

Particles of Substance X are dispersed in water to form a colloid. Which describes the electrical charges on the particles of Substance X? All the particles carry the same charge, which could be either positive or negative.

For the nitrogen fixation reaction, 3h2 (g) + n2 (g) 2nh3 (g), kc = 6.0 * 10-2 at 500°c. if 0.250 m h2 and 0.050 m nh3 are present at equilibrium, what is the equilibrium concentration of n2? a. 3.3 m b. 2.7 m c. 0.20 m d. 0.083 m e. 0.058 m

By which of the following features is Venus characterized? A. It is the nearest planet to the sun. B. It has a dense atmosphere of mostly carbon dioxide. C. It has a very thin atmosphere because of the solar wind. D. It is much larger than the Earth.

The electron configuration 1sÆ 2sÆ2pÒ 3sÆ3pÒ represents which noble gas?

Which of these pulls denser rocks towards Earth's center? 1. thermal energy 2. gravity 3. radiation

A series circuit has two 5.0-ohm resistors and a power source of 9.0 volts. How will the current be affected and what will it be if another resistor (with a resistance of 7.5 ohms) is added to the circuit? A. increase; 0.51 amps B. increase; 0.

Which type of reaction will occur when equal volumes of 0.1 M HCl and 0.1 M NaOH are mixed 1. Neutralization 2. Ionization 3. Electrolysis 4. Hydrolysis

What is molarity of heavy water?

Do all liquids freeze at the same rate

Convert 1.67 x10^24 atoms of carbon to moles of carbon