Select all of the following which are examples of physical change.

change of composition

creation of a new substance

change of appearance

change in size and shape of a substance

change in phase of a substance

expansion or contraction of a substance

A sample may contain any or all of the following ions: Hg22+, Ba2+, Mn2+. No precipitate formed when an aqueous solution of NaCl or Na2SO4 was added to the sample solution. A precipitate formed when the sample solution was made basic with NaOH.

Show your work, including units, for the following series of calculations: a. How many moles of Al are in 1.25 g of Al? b.

What can you logically conclude about the relationship between full moon and lunar eclipse? A.) A lunar eclipse never occurs during a full moon. B.) A lunar eclipse occurs during all full moons. C.) A lunar eclipse can only occur during a full moon.

Is there a state of matter in which the molecules are not moving at all? What is this phenomenon known as?

Which of the following would make a solution? A. Oil in water B. Ice in water C. Sugar in water D. Sand in water

Consider three identical flasks filled with different gases. Flask A: CO at 760 torr and 08C Flask B: N2 at 250 torr and 08C Flask C: H2 at 100 torr and 08C a. In which flask will the molecules have the greatest average kinetic energy? b.

When using a. csv file for Lookups, the first row in the file represents this?

If you were presented with 2l of a 2m sucrose stock solution, how many grams of sugar would be in a 100 ml aliquot?

1. What is something you might see a scientist doing?

Is fire living or non living