Which of the following is an example of a double replacement reaction?

(a) 3Fe + 2O2 Fe3O4

(b) BaCl2 + K2CO3 BaCO3 + 2KCl

(c) NiCO3 NiO + CO2

(d) Cl2 + 2NaBr 2NaCl + Br2

What happens to the mass if the volume is tripled? A: it is also tripled B: it doesnt change C: it is reduced to 1/3

Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 2.7 fm (femtometers) ? and the radius of the atom is approximately 70 pm (picometers). Calculate the volume of the nucleus and the volume of the atom.

Combustion of hydrocarbons such as propane (C3H8) produces carbon dioxide, a "greenhouse gas." Greenhouse gases in the Earth's atmosphere can trap the Sun's heat, raising the average temperature of the Earth.

How do I write 0.03438 m in scientific notation using 3 digits?

Which of the following arises from interaction of dipoles? 3. a) lonic bond b) Covalent bond c) Metallic bond d) Hydrogen bond

Describe the physical properties of water

Which element has the same number of valence electrons as oxygen--. a. Neon-b. Nitrogen-c. Sulfur-d. Fluorine

Approximately how many half-lives must pass for the amount of radioactivity in a substance to decrease to below 1% of its initial level?

Which piece of glassware is best suited for making accurate dilutions?

Match each equilibrium constant with the direction that the reaction is favored. question 4 options:k = 6.7 x10-4k = 325k = 1.0 x 107k = 0.0035