Which is an example of a chemical change

a.) a candle burns

b.) a pan of water boils

c.) a teaspoon of salt dissolves

d.) a burner gets red hot

A piece if copper has a volume of 100.0cm3. If the mass of copper is 890 g, what is the density of copper?

Define potential energy and then explain what factors or variables cause potential energy to change

What is the percentage of aluminum in aluminum sulfate, Al2 (SO4) 3

Which type of change occurs when the electrons between two atoms form a bond? A. neutron change B. nuclear change C. color change D. chemical change

Which of the following is a hereditary disease? Huntington's disease Influenza Lyme disease Strep throat

How many Joules of energy are required to change 10.0 gram of ice at - 2.0 C to water at 20.0 C? (use your constants) 440 J 66,000 J 880 4220 J

Why are Van der Waals forces important? A) They determine how strong dipole moments will be in polar covalent molecules B) They are the strongest type of intermolecular force that can act on polar and non-polar molecules C) They are primary

When heat is added to or removed from a substance, it may change its state. What state will most likely result if heat is added to a liquid?

Chemical Reactions Lab Procedures: 1. Place a 1cm long piece of white chalk in a clear plastic cup. 2. Add 5 mL of vinegar to the cup. 3. Record your observations. If you were performing the procedures above you would need to A.

How many moles of oxygen are in 0.53 moles of co 22?