Which of the processes is exothermic?

1. evaporation of alcohol

2. sublimation of iodine

3. solidification of volcanic lava

4. burning of paper

Explain a dipole-dipole relationship

Os etapas que devem sem compridas para obter separadamente os componentes (a as substâncias) de uma mistura de água, sal e areia, são respectivamente : A) filtração e sifonação B) decantação e sifonação C) filtração e destilação simples D) catação e

How many grams of potassium chloride are required to make 250 ml of a 0.75 m kcl solution?

In a calorimeter 3.34 kj of heat was absorbed when 10g of ice melted. What is the enthalpy of the fusion of the ice? I know the answer is 334J/g but I don't know how?

Which of the following statements is true? Most nonmetals can be drawn into a wire, while metals would break apart. Most metals can be drawn into a wire, while nonmetals would break apart.

Which of the following is not an indication of a chemical change?

Which of the following is not a projectile? a. a satellite b. a throw ball c. a ball on the ground d. a soaring arrow

A change of state requires the addition or removal of heat energy. True False

Trevor watches as a freight train passes. He counts eight identical black railroad cars, then a red car, followed by several more black cars.

How long does a hydrogen bond last in water