Which of the following is an endothermic reaction?

condensation of steam

combustion of methane

the reaction in a cold pack

an explosion

How do meteorologists make accurate weather predictions?

Calculate the vapor pressure, in mm hg, at 25c of water above a solution made by dissolving 100. g sucrose, (fw = 342.3) in 250. g of water. the vapor pressure of pure water at 25c is 23.8 mm hg.

What evidence of a chemical reaction might you see in the following cases? * Bleaching a stain * Burning a match.

How long does it tae for bleach to evaprate?

A plant uses the energy from sunlight to create oxygen and glucose from carbon dioxide and water. Which statement is true about the changes that have occurred? A. A physical change has occurred because the substances are still gases B.

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?