A substance changes state from solid to liquid. What has happened?

O Aphysical change

O A chemical change

O A chemical reaction

The creation of matter

Most thermal energy in the atmosphere is transferred by what

What is the rate of a reaction if the value of kis 0.1, [A] is 1 M, and [B] is 2 M? Rate = K[A]2[B]2 A. 1.6 (mol/L) / s B. 0.8 (mol/L) / S C. 0.2 (mol/L) / S D. 0.4 (mol/L) / S

A 3.0 mole sample of KBrOz was decomposed according to the following equation. How many moles of O2 are formed? * 2KBrO3 → 2KBr + 302

What makes H20 a polar molecule? What are the two different poles in the H2O molecule?

If the oxidation number of nitrogen in a certain molecule changes from + 3 to - 2 during a reaction, is the nitrogen oxidized or reduced? how many electrons are gained or lost by the nitrogen atom?

A sample of three mixed gases is at 632.0 mmhg. if the partial pressure of co2 is 124.3 mmhg and the partial pressure of n2 is 461.9 mmhg, what is the partial pressure of o2?

How do the products and reactants of a chemical change compare? The mass of the products is greater than the mass of the reactants because energy is taken in by the reaction.

All the following are characteristic properties of phosphorus. Which one is a chemical property? (a) When exposed to air, white phos - phorus will burn spontaneously, but red phosphorus will not. (b) Red phosphorus and white phos - phorus are solids.

What are the monomers of proteins called

What type of fermentation occurs in yeast?