Which of the following is required to change the state of matter?

addition or removal of heat

decrease in temperature

increase in temperature

addition or removal of energy

Where do the materials used to make electronic devices come from

What are the concentrations of hydroxide and hydronium ions in a solution with a pH of 8.3? 2.9 * 10-5 M H3O + and 3.4 * 10-10 M OH- 3.1 * 10-6 M H3O + and 3.2 * 10-9 M OH- 5.0 * 10-9 M H3O + and 2.0 * 10-6 M OH- 6.3 * 10-11 M H3O + and 1.

What is true about the metals in group 1A, 2A, 3A? a) all form ions with negative charges b) all have ions with a 1 + charge c) gain electrons when they form ions d) lose electrons when they form ions

What is true about both sodium and gold? They are very reactive. They are volatile. They are metals. They are in the same group.

How does a fusion reactor contain the super heated plasma it creates? A. Magnetic fields B. Electrical fields C. None of these D. Laser grids

What types of matter could be separated by physical methods?

What information does a net ionic equation give that a complete ionic equation does not show

What is the molality of a solution containing 4.0 moles of solute in 3.2 kg of solvent? Round to the nearest tenth. Don't forget the units.

What is the name of a binary compound made up of lithium and chlorine?

A scientist in London and a scientist in California both conducted independent investigations that produced similar results.