identify 2 changes of state that require energy to be used, and 2 changes of state that require the release of energy

What does emulsion mean?

What is the volume of 20.0 of air.

Two chemical reactions are shown: C + O2 → CO2 CO2 + H2O → H2CO3 Which statement is true? Both are synthesis reactions. Both are decomposition reactions. A is a synthesis reaction, and B is a decomposition reaction.

Use kinetic-molecular theory to describe what happens when an ice cube or icicle melts. Include how energy is involved and what happens to the motion of the water molecules

On analysis, an equilibrium mixture for the reaction 2H2S (g) 2H2 (g) S2 (g) was found to contain 1.0 mol H2S, 4.0 mol H2, and 0.80 mol S2 in a 4.0 L vessel. Calculate the equilibrium constant, Kc, for this reaction.

What is the element Ar classified as in the periodic table?

Two objects, one heavy and one light, travel at one of two speeds. Which will have the most inertia?

Which statements correctly describe water boiling in a pot? Air bubbles from the atmosphere are being absorbed. The water's internal kinetic energy is increasing. The water is gaining internal potential energy. The water's temperature is increasing.

Biofuel is any fuel that is produced from living or once living matter in a short period of time, days, weeks, or even months.

How are revolution and year related