Test 1 Chemistry 9 Dr. Kline January 14, 2016

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1 Test 1 Chemistry 9 Dr. Kline January 14, 2016 Name There should be a total of nineteen questions on four pages; please check to make sure that they are all here. Do not use your own tables, scratch paper or other information. Please turn off all cell phones, pagers and other communication devices; they will be confiscated if they make noise. No food. No gum. No bathroom breaks. No scratch paper. The test will end 90 minutes after it starts. A periodic table will be provided points Provide the name for each of the following element symbols and the symbol for each of the names. Spelling counts! Cr Hg U Potassium Silicon Silver 2. 6 points Complete the following table. You need not show work. Symbol Atomic Number Mass Number Protons Electrons Neutrons Cu points For each description provide the name of one element that meets that description. There may be more than one element that fits, but you need only to provide one. You will get partial credit if you supply symbols instead of names. a. Has five valence electrons b. Is a halogen c. Is a transition metal d. Is an alkali metal e. Is a metal in Group 4A (Group 14 in some periodic tables and Group IVA in others) f. Is a noble gas Page 1 of 4 Test 1 - Chem 9 - Winter 2016

2 4. 4 points In each of the following write the answer using the same number of significant digits as in the number given. a. Write as a regular number b. Write 45,000,000 in scientific notation 5. 4 points Circle the value that corresponds to the heaviest mass and support your answer with calculations and/or conversions. 12 kg Mg 25,000 mg 6. 8 points A modern copper penny contains more zinc than copper. How many atoms of zinc are there in a penny if it contains 2.44 grams of zinc, Zn? Show work clearly with units and include units with your final answer points According to one source, Los Angeles declares a Smog Alert #1 when the concentration of ozone reaches ppm (parts per million). Convert this to percent ozone by mass (parts per hundred). You do not have to show work; however, if your final answer is not correct and you have work shown, it might get you some partial credit points Draw the Lewis structure of each of the following compounds, assuming the octet rule applies. Include all lone pair electrons in your structures. Carbon is the central atom in both structures. You need not draw the structures with the correct geometry (shape). a. H2CO b. CHFBr2 Page 2 of 4 Test 1 - Chem 9 - Winter 2016

3 9. 10 points Consider the molecule of ethanol whose structure is drawn below. a. Write the chemical formula of ethanol, based on the structure: b. Calculate the molar mass (grams in one mole) of ethanol. Show work with units. c. Calculate the mass percent of carbon in ethanol. Show work with units points Consider the molecule drawn below. a. What is its name? b. What is the name of its molecular shape? (choices include tetrahedral, trigonal planar, linear, bent, and trigonal pyramidal) points The EPA has used the slogan Ozone: Good Up High, Bad Nearby in some of its publications. Explain the message. Page 3 of 4 Test 1 - Chem 9 - Winter 2016

4 12. 4 points Consider the wave below that represents a portion of the electromagnetic spectrum. Draw a wave to the right of the original one that represents a higher-energy portion of the electromagnetic spectrum points Which of the following occurs when a molecule of a greenhouse gas absorbs infrared radiation of the appropriate frequency (or frequencies)? Circle the letter of the correct answer. Only one answer is correct. a. Nothing, because these gases don t absorb infrared radiation. b. One or more of the bonds in the molecule breaks. c. Bonds that aren t already vibrating (stretching or bending) begin to vibrate. d. Bonds that are already vibrating (stretching and bending) increase the intensity (amplitude) of these vibrations. e. It reacts with a molecule of a CFC (chlorofluorocarbon) points What type of electromagnetic radiation is involved in ozone depletion with the help of chlorofluorocarbons? Circle the letter of the correct answer. Only one answer is correct. a. ultraviolet, uv b. infrared, IR c. microwaves d. gamma radiation e. visible points Which of the following is the main source of carbon monoxide pollution? a. cows b. rice paddies c. carbon sequestration d. burning coal e. cars points Balance the equation below for the combustion of acetylene. C2H2 + O2 CO2 + H2O points Answer each of the following with a name or chemical formula a. What is the major component of air? b. Which substance has a significantly lower concentration in exhaled air than inhaled air? points Which of the following are consequences of global warming? More than one is correct; circle the letters of all the correct answers. a. disappearance of sea ice b. decrease in ozone in the troposphere c. occurrence of some infectious diseases in areas where they did not previously occur d. depletion of coral reefs due to changes in ocean chemistry e. rising sea levels Page 4 of 4 Test 1 - Chem 9 - Winter 2016

5 Possibly Useful Information - Test #1 - Chem 9 Avagadro s Number is atoms or molecules per mole. 1 gram = amu.

Name Chemistry 10 Dr. Kline 11 May 2004 Row Seat Lab 8:00 10:30

Test 3 Name Chemistry 10 Dr. Kline 11 May 2004 Row Seat Lab 8:00 10:30 This test consists of a combination of multiple choice and other questions. There should be a total of 24 questions on 6 pages plus