Ballons filled with helium gas are taken outside on a hot, sunny day and tied to a fence. Over a period of a few hours, the balloon will

Charles’s Law states that if a given quantity of gas is held at a constant pressure, then its volume is directly proportional to the absolute temperature. This law explains why

A student heated a 10g sample of a compound in an open container. A chemical reaction occurred. The mass of the sample was measured again and found to be less than before.

Many laboratory preparations of solutions call for stirring the solvent while adding the solute. Which of the following is always an effect of this procedure?

A large log of wood will burn more slowly than the same log chopped into smaller pieces. What is the best explanation for this observation?

Which of these describes an exothermic chemical reaction?

A gas in a sealed cylinder is heated. Which of the following does not increase as the gas is heated?

The pressure of a gas inside a closed, rigid container will increase when the gas temperature increases. The pressure of the gas increases because the

Which of the following observations about a certain pure solid would indicate most strongly that the solid is ionic?

Melting can be defined as a

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