Which of these is common to all chemical changes?

A)

A change of state occurs.

B)

A change of color occurs.

C)

A new substance is produced.

D)

Heat is released into the air.

Is this reaction endothermic or exothermic d) NH4NO3 (s)  NH4 + (aq) + NO3 - (aq) [Note, this is the reaction that takes place in a cold pack]

Determine the solubility of N2 in water exposed to air at 25°C if the atmospheric pressure is 1.2 atm. Assume that the mole fraction of nitrogen is 0.78 in air and the Henry's law constant for nitrogen in water at this temperature is 6.

Mixture bubbles and a gas emitted is that physical or chemical change

What is the mass of copper that increases its temperature by 285 degrees celsius when 186,000 j of energy is applied?

What is the name of the compound (NH4) 2SO2

Ions that consist of a single atom are called ... ions

Ecosystems are clearly separated from one another. Where one ecosystem stops, another begins A: True B: False

Mass_mole relationship

What is the momentum of an 800-kg car | traveling at a velocity of 10 m/s? What is its momentum if it speeds up to 50 m/s?

How many grams of CuSO4 are there in 100.0 g of hydrate? How many moles?