Congratulations! You discover a new element you name wyzzlebium $(\mathrm{Wz})$. The average atomic mass of $\mathrm{Wz}$ was found to be $303.001\mathrm{~amu}$, and its atomic number is 120 .

(a) If the masses of the two isotopes of wyzzlebium are $300.9326\mathrm{~amu}$ and $303.9303\mathrm{~amu}$, what is the relative abundance of each isotope?
(b) What are the isotopic notations of the two isotopes?
(c) How many neutrons are in one atom of the more abundant isotope?

The neutron was discovered in 1932 by

(a) Dalton
(b) Rutherford
(c) Thomson
(d) Chadwick

Does the fact that two elements combine in a one-to-one atomic ratio mean that the charges on their ions are both 1? Explain.

Write formulas for these compounds:

(a) strontium chloride
(b) potassium iodide
(c) aluminum nitride
(d) calcium sulfide
(e) sodium oxide

In which of the following is the formula correct for the name given?

ammonium hydroxide, $\mathrm{NH}_4\mathrm{OH}$

Write the formula of the compound that will be formed between this elements:

(a) $\mathrm{Al}$ and $\mathrm{S}$
(b) $\mathrm{H}$ and $\mathrm{F}$
(c) $\mathrm{Na}$ and $\mathrm{I}$
(d) $\mathrm{Sr}$ and $\mathrm{O}$
(e) $\mathrm{Cs}$ and $\mathrm{P}$
(f) $\mathrm{K}$ and $\mathrm{Cl}$

In which of the following is the formula correct for the name given?

cadmium cyanide, $\mathrm{Cd}(\mathrm{CN})_2$

Absent-minded Alfred put down a bottle containing silver on the table. When he went to retricve it, he realized he had forgotten to label the bottle. Unfortunately, there were two full bottles of the same size side-by-side. Alfred realized he had placed a bottle of mercury on the same table last week. State two ways Alfred can determine which bottle contains silver without opening the bottles.

A $100.0-\mathrm{mL}$ volume of mercury (density $=13.6 \mathrm{~g} / \mathrm{mL}$ ) is put into a container along with $100.0 \mathrm{~g}$ of sulfur. The two substances react when heated and result in $1460 \mathrm{~g}$ of a dark, solid matter. Is that material an element or a compound? Explain. How many grams of mercury were in the container? How does this support the law of conservation of matter?

The abundance of iodine in seawater is $5.0 \times 10^{-8}\%$ by mass. How many kilograms of seawater must be treated to obtain $1.0\mathrm{~g}$ iodine ?

Name these acids :

(a) $\mathrm{HNO}_2$
(b) $\mathrm{H}_2 \mathrm{SO}_4$
(c) $\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
(d) $\mathrm{HBr}$
(e) $\mathrm{H}_3 \mathrm{PO}_3$
(f) $\mathrm{HC}_2 \mathrm{H}_3 \mathrm{O}_2$
(g) $\mathrm{HF}$
(h) $\mathrm{HBrO}_3$
(i) $\mathrm{HIO}_4$

Cite the evidence that indicates that only physical changes occur when a platinum wire is heated in a Bunsen burner flame.

A $500.0-\mathrm{g}$ piece of iron is heated in a flame and dropped into $400.0\mathrm{~g}$ of water at $10.0^{\circ}\mathrm{C}$. The temperature of the water rises to $90.0^{\circ}\mathrm{C}$. How hot was the iron when it was first removed from the flame?

Write formulas for these acids :

(a) acetic acid
(b) hydrofluoric acid
(c) hydrosulfuric acid
(d) boric acid
(e) nitrous acid
(f) hypochlorous acid