Chemistry 111, Exam 1

1. Fill in the blank.

(A) ____________________ showed that mass was conserved in experiments.

(B) _____________________ are atoms of an element with different numbers of neutrons.

(C) Our best explanation of a natural phenomenon is a _____________.

(D) The discovery of subatomic particles showed that there were errors in __________________’s Atomic Theory.

(E) Group I are called the ___________________ metals.

2. How many Sig Figs in each of the following numbers?

(A) 3250 meters____________ (B) 15 books__________

(C) 0.000170 inches __________ (D) 101 miles ____________

3. Significant Figures: Write the answer to the correct number of significant figures.

(A) 200 g / 14.7 mL = _______________________

(B) = __________________________

(C) 2.145 x 10^-3 mL + 3.1 x 10^-4 mL = _______________________

4. Conversions:

(A) Convert - 15 °F into °C

(B) 0.0153 mm into μm.

5. A bird can fly 14 m/sec. How fast is this in miles/hour? (There are exactly 2.54 cm per 1 inch and exactly 5280 ft per mile.)

6. Convert the density of water 1.0 g/cm³ into lbs/ft³? There are 454 g = 1 lb, exactly 2.54 cm per 1 inch and exactly 12 in per ft.

7. Fill in the following table of isotopes:

Symbol of isotope	Name of element	# of Protons	# of neutrons	Mass number	# of electrons	Net charge
^52Cr^2+
		25		55	25
	Iodine		74			-1

9. Name the following. 10. Write the formulas for the following.

(A) Pb(NO₂)₂ (A) potassium permanganate

(B) Ag₂SO₄ (B) barium hydroxide

(C) Al₂S₃ (C) hypochlorous acid

(D) H₃PO₄(aq) (D) calcium chlorate

(E) Cr(CH₃COO)₃ (E) iron (III) hydrogen carbonate

(F) NH₄Cl (F) lead (IV) cyanide

(G) CuHPO₄ (G) cesium nitride

(H) NaNO₃ (H) copper (II) phosphate

(I) P₂S₅ (I) Carbonic acid