CHEM 1411 Test I
Name________________
Multiple Choices: Select one best answer.
1. Which of the following is a physical change?
(a) color of carpet faded (by sun light)
(c) zinc strip dissolves in vinegar (to produce hydrogen gas)
(e) coal burning
(b) water evaporates
(d) wine turns sour
2. Which of the following is a heterogeneous mixture?
(a) benzene and hexane
(b) salt, water, and sugar
(d) 14-K gold ring
(e) air
(c) oil and alcohol
3. Which of the following is inaccurate?
(a) silicon, Si
(b) mercury, Hg
(e) iron, Ir
(c) silver, Ag (d) chromium, Cr
4. Which of the following is a molecular compound?
(a) KCl
(b) CsF
(c) HCN
(e) NaOH
5. Which of the following is the empirical formula?
(a) C8H18
(b) CH3COOH
(c) C4H10O2
(d) AlBr3
(d) NH4NO3
(e) B2H6
Problems (show your procedures and calculations)
6. What is the equivalent temperature for 98.6 Fahrenheit in oC and Kelvin?
7. An unknown sample has a mass of 13.9 g and a volume of 17.4 mL. What is its
density (g/mL)?
8. How many significant figures are there in the measurement of 6.124 x 10-5?
1
9. How many significant figures are appropriate to show in the result after carrying
out the operation below?
(223.7 + 0.27) ÷ 4.21 =?
10. How many protons, electrons, and neutrons are there in 72Br - ?
11. How many protons, electrons, and neutrons are there in 53Cr3+ ?
12. Write the molecular formula for the following compounds:
(a) aluminum chloride
(b) iron (II) sulfite
(c) chromium (III) fluoride
(d) nitrous acid
(e) copper sulfate pentahydrate
13. Name the following compounds:
(a) Ba3(PO4)2
(b) (NH4)2SO4
(c) Na2O2
(d) Ca(NO3)2
(e) Fe2(SO3) 3
2