How many groups are there in the modern periodic table?

Why does continental crust rise above oceanic crust when the two meet

Which of the following describes a saturated solution? A. One containing 1 g of sugar in 100 mL of water. B. One that contains as much solute as it can hold at a given temperature. C. One that contains less solute than it can hold at 25oC. D.

Which of the following is a unit of volume

Snow melting is a physical change. True False

A group of science students collect bacterial swabs from several locations inside their school. The collected bacterial swabs are spread over an agar-filled petri dish and bacteria colonies are grown.

What mass of potassium chlorate would contain 40grams of oxygen?

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) zero.

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second? (Note that the half life of Uranium-238 is 4.468x109 years)

A base can neutralize an acid. true or false

Hydrochloric acid (12.0 ml of 0.233 m) is added to 296.0 ml of 0.0579 m ba (oh) 2 solution. what is the concentration of the excess h + or oh - ions left in this solution?