Write your answers to the correct number of significant figures.

Circle the best answer of the following:

Using the rules of significant figures, calculate the following:

$\frac{12\mathrm{.}50+80\mathrm{.}560}{7\mathrm{.}64}$

a$)11\mathrm{.}0$

b$)11\mathrm{.}5$

c$)11\mathrm{.}53$

d$)12\mathrm{.}84$

c$)12\mathrm{.}8$

$2.$ Calculate the molarity of the resulting solution if $2\mathrm{.}26{10}^{-2}L$ of $1\mathrm{.}50MHCl$ solution is diluted to $300,0mL.$

a$)0\mathrm{.}196M$

b$)0\mathrm{.}0675M$

c$)0\mathrm{.}113M$

d$)0\mathrm{.}225M$

e$)0\mathrm{.}0225M$

$3.$ From the following compounds choose the name$-$formula pair that is correctly matched.

a$)$ Sodium phosphate; $N{a}_{3}P{O}_3$

b$)$ Sulfur dichloride; $SC{l}_4$

c$)$ Copper$($I$)$ carbonate; $CuC{O}_3$

d$)$ Iron$($II$)$ bromide; FeBr

e$)$ Carbonous acid; $H_{2}C{O}_3$

$4.$ How many molecules are contained in $4\mathrm{.}71$ grams of $C{H}_4?$

$($Molecular Mass $($:$C{H}_4=16\mathrm{.}04\frac{g}{m}$ole$\}$

a$)1\mathrm{.}77{10}^{23}$

b$)3\mathrm{.}00{10}^{24}$

c$)3\mathrm{.}61{10}^{20}$

d$)5\mathrm{.}42{10}^{22}$

c$)6\mathrm{.}022{10}^{23}$

$5.$ Which of the following is not a transition element?

a$)Cr$

b$)Se$

c$)$ Au

d$)Co$

e$)Se$

$6.$ What is $($are$)$ the spectator ion$($s$)$ in the following reaction?

$2HCl{O}_{4(aq)}+Ba(OH{)}_{2(aq)}Ba(Cl{O}_4{)}_{2(aq)}+2H_{2}O(l)$

a$)H^{+},O{H}^{-}$

b$)H^{+}$

c$)B{a}^{2+},O{H}^{-}$

d$)B{a}^{2+},Cl{O}_4^{-}$

e$)O{H}^{-}$

$7.$ Which element has the smallest atomic radius $($size$)?$

a$)Al$

b$)Si$

c$)Mg$

d$)P$

e$)Cl$

$8.$ Which element has the highest first ionization energy?

a$)0$

b$)Be$

c$)N$

d$)C$

e$)$ B

$9.$ Which comparison of electronegativities is not correct?

a$)P>S$

b$)Br>As$

c$)Mg>Na$

d$)C>B$

e$)Cl>Br$

$10.$ Which of the following salts is soluble in water?

a$)BaS{O}_4$

b$)N{H}_{4}Br$

c$)$ CuS

d$)PbC{l}_2$

e$)$ a and c