Melting requires

a. the removal of energy.

b. the absorption of energy.

c. no energy change.

Which statements describe what happens in a redox reaction? Check all that apply. A. Electrons move from one substance to another. B. One atom gains electrons and one loses electrons. C. The cations on two substances trade places. D.

A box has dimensions of 69.5 cm, 71.0 cm, and 105 cm. What is the volume rounded to three digits? 518,000 cm2 518,000 cm3 518,000 cm 490,000 cm3

If the density of an ideal gas at stp if found to be 0.0902 g/l, what is its molar mass?

What is the definition of crust?

The density of liquid A is 1.0240 g/mL. A cup with a sample of liquid A in it weighs to be 45.66 g. The mass of the cup alone is 12.32 g. What is the volume of liquid A in the cup?_mL

What is the total amount of heat absorbed by 100.0 grams of water when the temperature of the water is increased from 30.0°C to 45.0°C? A) 418 J B) 6270 J C) 12 500 J D) 18 800 J

What is enthalpy a measure of? A. The heat content of a system. B. The kinetic energy of a system. C. The number of moles of a reactant in a system. D. The disorder of a system.

The complete ionic equation for the reaction of aqueous sodium hydroxide with aqueous nitric acid is

The red spheres represent oxygen atoms, and the blue spheres represent hydrogen atoms. Is this substance a compound?

You are on an island and need freshwater to drink. Which process could you use to separate that salt from ocean water and provide freshwater for drinking?