S18q2key_bc.pdf - 163s18 qub January 18 section name...

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Unformatted text preview: 163s18 qub January 18 section: __ name: If‘Q—xf 2L3 1 . (2 pt) This question has two parts. a. Which is heterogeneous, (1) a cup of cold tea or (2) cold tea with ice? (2.) C o I 3\ lion w \ 41k \Q—Q, b. Explain your answer. PLEASE PRINT. (:02, ‘\_(7 \A'Swgkkkj VXQE— mmcfimfi &‘Wk‘amk& meglqouvi’ '2 (1 pt) When you b11111 methane gas C114, it 1eacts with oxygen gas in the an and fonns wate1 vapo1 and 0 $0 3. L0 1 $0 Z. to caibon dioxide gas. The 1eaction is CH; (g) + 202 (g) ——> 21120 (g) + C02 (g) When 0.80 grams of methane, CH4, react with 3.20 g of oxygen 02, ploducts include 1.80 grams of water, H20. How many Grams of car bon dioxide, C02, will f01111? Z 10 g C02 3; (2 pt) Write 111 scientific notation to the correct number of significant figures: ‘5 , a 000001490 mm (diametei ofa v11us) I Li (I 5500 17111)) 619000 cm (height ofMt. Denali) 0 I3 )K/O5 in: mg 4. (3 pts) This plobleni has three paits A 1ectangle 1s 1114 mm wide. ' a. fWhat is the uncertainty in this measulement? i 0 11 111111 b. , Using a ruler from the laboratory, Student A and Student B both measured the width of the rectangle.- Their results are shown in the table below. Please answer the questions shown after the table. I I Student A l Student B I I measurement 1 121.4 111111 111.0 111111 I I measurement 2 121.4111111 I 112.8 111111 I measurement 3 121.3 111111 I 110.4 mm Did Student A or Student B make the more accurate 111easu1‘e111ents? 3 Wt 13 -'C. Explain your answer. PLEASE PRINT. ' ' S"ll/wt “Map? a? I’M MAN—e— WWWICJ¢W$ 'Lwogm h m 6;ka v41 wig ' 5. (4 pts.) This problem has 3 parts. a. Underline significant ZEROIS} in each number. 01 3949900.. <2) 121.1W5999920 1 b. Round this number to FOUR significant figures: 2099:99 too 23 495 2.011171 No ”We *2 c How many si mfcmztfgul es Sigméld be repgitged 1n the ANSWER to the following calculation? 2 g 9 5 5 I84. 322IIO. 00215052 = DO NOT CALCULATE (0.0080) (715 x10“) 26? 355’ 6. (2 pts) Given the name of the element, write the symbol. PLEASE PRINT. a iron Ee, b. bromine Br 0. arsenic A S (1. copper Cue . 7. (2 pts) Given the symbol for the element, write the name. PLEASE PRINT. a. Ni n \‘C 34 e,\ V C. Cr Clarom {mm b. Ti ’l‘it l‘mm \ cum Cl. Mn Mkmfimvch C ‘8. (4 pts) How many milliseconds are there in an 90. O—m'z'mtz‘e class period? Please use the “gfu” approach and , , show all work for full credit. Please pay attention to significant figures. Just a ntuneric’al answer earns you only > > 01 point. Possibly useful information: 1000 milliunits = 1 unit. (Hint: Units would be a measurement in units of grams, liters, meters, or seconds. What is the unit in THIS problem?) extra credit: (1 pt) A 90. 0~miaute class period is how many years long? You do not need to use the “gfu” approach but PLEASE show all work for full credit. Please pay attention to significant figures. Just a numerical answer earns you only 0.1 point. Possibly useful information: 365.25 days = 1 year. 3“ (lUO wuw 163s18 qz2c I JanuarylS section: ._._. name: \4{:; lo ‘I l. (2 pt) This question has two parts. a. Which is heterogeneous, (l) a cup of soda pop or (2) soda pop with ice? l '2 l ‘50 deck PO? w 1444 toe. ‘ b. Explain your answer PLEASEPRINT. 6 \Ce \3 wgwhbvvxol" \Avxt WTALS‘lY‘ lgwl-LA flrow5_ Owlr !\.) (1 pt) When you b11111 methane gas CH4, it 1eacts w1tl1 oxygen gas in the an and fo11115 wate1 vapm and 830 3 .10 1.0% 2 2.0 carbon dioxide gas The 1eaction is H4 (g) + 202 (g) ——> 2HzO (g) + C02 (g) Wl1en 0.80 grams of methane, CH4, react with 3.20 g of oxygen, 02, products include [.80 grains of water, HZO,‘and 2.20 grams of carbon dioxide, C02? l 55 0 g water (2 pt) Write in scientific notation to the correct number of significant figures: . . -1 , y . a. 000000001490 111 (diameter ofavirus)’ l»'~i‘lDNO mb. 6190 111 (height ofMt. Denali) was“); \m 4. (3 pts) This problem has three parts. A rectangle is 443.4 mm wide. U.) a. What is the uncertainty in this measurement? i o . \ 111111 b. Using a ruler from the laboratory, Student A and Student B both measured the width of the rectangle. Their results are shown in the table below. > Please answer the questions shown after the table. Student B | 444.0 mm 1 443 .2 min ] 443 .6 mm Student A measurement 1 444.3 111111 measurement 2 444.2 111111 measurement 3 444.2 111111 Did Student A or Student B make the more grecise111easuren1ents? 3 ivgd’U/x-l“ A 0. Explain your answer. PLEASE PRINT. +lrvt WALKS verb/vac 14% We, (Lager hath-(near 5. (4 pts) This problem has 3 parts. ' a. Underline Significant ZEROfSl in each number. (1) 3000420 00 - (2) 13 net/590200 ”A’- b Round this number to FOUR szgluf cant f gures 50999 9 5 l 00 No C. How many smnzf cant f gut es sgiougl—d be regogted 1n the ANSWER to the following calculation? l ‘39 S S (84. 32221000215052 = DO NOT CALCULATE (0.008) (7.15 x 10“) ls? 3S? 6. (2 pts) Given the name of the element, write the symbol. PLEASE PRINT. a. iron E b. cobalt ' CO C. arsenic A: § d. copper Cw 7. (2 pts) Given the symbol for the element, write the name. PLEASE PRINT. fa. Kr LQT Pb“ c. Cr dare m (va3 b Ti H Jmmo‘cm . d. Mn VVVKWSKerSQ. 8. (4 pts) How many milliseconds are there in an 75-772inuz‘e class period? Please use the “gfu” approach and show all work for full credit. Please pay attention to significant figures. Just a numerical answer earns you only 01 point. Possibly useful information: 1000 milliunits = 1 unit. (Hint: Units would be a measurement in units of grams, liters, meters, or seconds. What is the unit in THIS problem?) 3: 75 mm extra credit: (1 pt) A 75-minute class period is how many years long? You do not need to use the “gfu” approach but PLEASE show all work for full credit. Please pay attention to significant figures. Just a numerical answer earns you only 0.1 point. Possibly useful information: 365.25 days = 1 year. 3“ 15min . 9- yr . Ud‘t 5%)»ng min -39 Myer—>2 A A 7"? i ii: ”‘ lbxr' lklkv‘i ‘5‘) 34JS‘ZS\AZ‘7V J (,0 Mivx "...
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