Which of the following are used to determine whether a substance is an acid or a base? (select all that apply) orange juice
litmus paper
universal indicator
water

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

What is the work done by the electric force to move a 1 c charge from a to b?

Which substance—wood or silver—is the better thermal conductor? a thermal conductor is a material that requires very little heat energy to change its temperature. explain your answer.