Is melting a piece of wax a physical or chemcial change

Which of the following is true of clouds at medium altitudes?

A 171 g sample of tetrafluoromethane (CF4) contains 90 g of carbon. What is the mass percent of fluorine in the compound?

write a generalization correlating solubility with ionization. start with: "as compounds become more ionized, ..."

Do Lemons Contain Natural Sugar? !

What is Charles' law formula?

A compound that changes color when it comes into contact with an acid or base is an?

1. A food sample is burned in a calorimeter that contains 2000. g of water. The temperature increases from 22.0°C to 44.3 °C. How many Calories does the food sample contain, assuming all of the energy from the food was transferred into the water?

Why doesn't water light on fire? It has all the ingredients except heat! Hydrogen for the flammability factor, oxygen so it can keep burning, and all you need to do is add heat and BOOM you have a flame! 15 pts

The type of social bonds present in modern societies that are based on difference, interdependence, and individual rights is called:

The difference between ionic covalent and metallic bonding