What does the greenhouse effect do for humans and what are we doing to the greenhouse effect?
Greenhouse gases like carbon dioxide and methane trap heat that would otherwise escape the atmosphere, which would make Earth's average temperature well below freezing. Plants and animals are adapted to current global climate patterns, but excess emissions of carbon dioxide into the atmosphere (like burning fossil fuels where CO2 was stored in the earth) and livestock agriculture (which produces methane) are trapping more heat, increasing global temperatures, and affecting weather patterns.
If the pressure and amount of a gas is kept constant while the volume is doubled, what will the resulting temperature be compared to the initial temperature?
The final temperature will be double the initial temperature. Volume and temperature increase linearly when pressure and number of moles are constant, according to the ideal gas law. PV=nRT so initial pressure (P) over initial temperature (T) will be equal to final pressure over final temperature.
Why are substances like salt so easy to dissolve in water?
Water is such a good solvent because it is a polar molecule that dissolves ions and polar molecules very well. Since oxygen is more electronegative, there is an uneven charge distribution between the partially negative oxygen atom and the partially positive hydrogen atoms. This stabilizes charged and polar substances through electrostatic attractions.