Which of the following relationships is/are CORRECT for gases? 1. The amount of a gas (in moles) is inversely proportional to its volume (at constant temperature and pressure). 2. The volume of a gas is directly proportional to its temperature in kelvin (at constant pressure and moles). 3. The pressure of a gas is inversely proportional to its temperature in kelvin (at constant volume and moles).

Does the energy in a solid increase or decrease when changing to a liquid?

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas