Mass is defined as anything that can be observed.

Question 4 options:

True

False

Which radioactive isotopes did the Curies discover? 1) polonium and radium 2) radium and carbon-14 3) carbon-14 and uranium 4) uranium and polonium

Match the following reactions with the reaction type. You may use each type more than once. 1) 2HgO (s) → 2Hg (l) + O2 (g) 2) KCl (aq) + AgNO3 (aq) → AgCl (s) + KNO3 (aq) 3) 2Na (s) + H2 (g) → 2NaH (s) 4) Mg (OH) 2 (aq) + 2HNO2 (aq) → Mg (NO2) 2

Describe the scale used to measure the basicity of a substance. Demonstrate how you could differentiate a weak base from a strong one

Sulphur-Oxygen bond lengths in SO2 are equal. Why?

What kind of solution would have a Ka value that is much less than 1

What form of matter is "vapor"? a. a solid made of a substance that is usually liquid c. a gas made of a substance that is usually solid b. a liquid made of a substance that is usually gas d. a gas made of a substance that is usually liquid

Which of the following atoms releases more energy than oxygen when an electron is added to its valence energy level? Select one: a. helium (He) b. fluorine (F) c. carbon (C) d. nitrogen (N)

End-users of natural gas include (check all that apply) :

Angle of incidence and refraction for air at 0 degrees?

Which formula represents a solution? No explanation needed.