Test 1

Test 1 - Matter, Measurements, and the Periodic Table
Total - Out of 50 Marks

You may use the periodic table at the beginning of your text book, and also a calculator for this test.

Multiple Choice (1 mark each)
1. Which of the following is an element?
a. Ethanol
b. Mica
c. Bismuth
d. Codeine
e. J-E-L-L-O

2. What will happen if you remove a proton from an atom of hydrogen?
a. The atom will acquire a positive charge.
b. There will be no change
c. The atom will be lighter but otherwise unchanged
d. The atom will cease to exist
e. The atom will acquire a negative charge

3. What are the two most common substances in the universe?
a. Hydrogen and oxygen
b. Nitrogen and oxygen
c. Silica and oxygen
d. Sodium and chloride
e. Hydrogen and helium

4. How many atoms are in a molecule of Al2(SO4)3?
a. 18
b. 17
c. 16
d. 15
e. 14

5. Change 0.000004394m into nanometres. How many nanometres would you have?
a. 4394 nm
b. 439.4 nm
c. 43.94 nm
d. 4.394 nm
e. 0.4394 nm

6. The Starbucks water bottle you gave me has markings of between 1 and 8 ounces. To how many significant figures do you know how much water is in the bottle?
a. 0
b. 1
c. 2
d. 3
e. 4

7. How many signifcant figures are in the following number? 24,000.0016700
a. 5
b. 7
c. 9
d. 11
e. 12

8. You travel 100 km in 7 hours. Therefore, how far have you travelled?
a. 14.28 km/hr
b. 1.4E2 km/hr
c. 1E1 km/hr
d. 14.285714285 km/hr
e. 14.2 km/hr

9. How can you convert mass into volume and back again?
a. Mass and volume are not interchangeable.
b. Mass and volume are interchangeable only if you know the weight of the substance.
c. Mass and volume are different ways to state the same measurement.
d. Mass and volume are interchangeable only if you know the density of the substance.
e. Mass has only to do with solids and volume only has to do with liquids. Therefore, they are not interchangeable.

9. Strontium is in the second column and fifth row of the periodic table. Its electron configuration ends with:
a. 5s2
b. 2p5
c. 5p2
d. 2s2
e. 2s5

10. Zinc is in the fourth row and twelfth column of the periodic table. Its electronic configuration ends with:
a. 4d12
b. 4d10
c. 12d4
d. 4p12
e. 12p4

11. How many protons does an atom of magnesium have? It has an electron configuration of: 1s2 2s2 2p6 3s2.
a. 8
b. 2
c. 7
d. 11
e. 12

12. The distinguishing electron is
a. the one with the top marks
b. the electron with the highest energy
c. the electron with the lowest energy
d. an electron in one of the "d" orbitals
e. the electron found in the 1s1 orbital

13. Which of these elements is a noble gas?
a. Chlorine
b. Bromine
c. Hydrogen
d. Oxygen
e. Xenon

14. The length of the average bacterium is about 500 nm. How many metres is this?
a. 5E-7
b. 5E-8
c. 5E-9
d. 5E-10
e. None of the above

15. Your body temperature is 37˚C. What is this in Kelvin?
a. 298 K
b. 371 K
c. 310 K
d. 373 K
e. 236 K

16. A pound of feathers and a pound of lead have the same weight and mass. However, they don't share the same:
a. Attitude towards life
b. Density
c. Acceleration due to gravity
d. Heterogeneity
e. Temperature dependence

17.You are making brownies for Mel. You have a measuring cup with every 100mL marked off. To how many decimal places is your measurement accurate in litres ?
a. 0
b. 1
c. 2
d. 3
e. 4

True or False (1 mark each)
If the answer is false, correct the answer to make it true.

18. Hydrogen gas gives off a smell like rotten eggs. This is a physical property.

19. Baking soda - NaHCO3 gives cakes their fluffy texture by decomposing into carbon dioxide (CO2) gas bubbles. This is a physical change.

20. You can change one compound into another by intensive physical means.

21. A compound must contain at least two elements.

22. An inexact number is one with uncertainty associated with it.

23. The p-orbital is circular.

24. The number of protons must equal the number of neutrons in an atom with no charge.


Short Answer (3 marks each)

25. You have a heterogeneous mixture of wood shavings, iron shavings, salt, and fine Florida sand. Give the steps that you would take to separate them.

26. What would happen to a molecule of carbon if you removed
a) an electron
b) a proton
c) a neutron

27. What three questions would you consider when trying to classify a substance as homogeneous/heterogeneous, pure substance/mixture, and element/compound?

28. State the physical properties that differ between solids/liquids and liquids/gases.

29. Your girlfriend's new hissing cockroach weighs 31.47 g. If one gram is equal to 1/454 pounds how many cockroaches would you need to equal your body weight in pounds?

30. Palladium is in the fifth row and the 10th column of the periodic table. Give it's complete electron configuration.

31. What are the four pieces of information needed to identify an electron in an atom?

Long Answer (5 marks)

32. With your knowledge of the structure of the atom, explain the following:
A beam of positive fast-moving particles was aimed at a thin piece of gold foil. Most of the particles passed through the foil and hit the detector on the other side of the foil, but a few of them were deflected at high angles, sometimes even backwards (ie towards the stream of incoming particles).

Bonus (1 mark each)

What is the colour of element #114?

What do the subshell letters s, p, d and f stand for?

Complete the following calculation to the correct number of significant digits:
[(24.3+34.76)*6.7837] / (4.015-1.0)