Study Guide - Chem III Exam #1
1. Convert to scientific notation:
a) 35800000000000 b2.00000000821
a).75 kg to mg b) 65 kg to go
3. Label precise or accurate:
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4. Mercury's density is 13.589/mL. Calculate
the volume of Mercury needed to obtain .5000 g Mercury.
5. Label # of protons, nevtrons, & electrons.
6.94 We also discuss several other topics like The temperature increases by 1◦f. how much does it increase in degree celsius?
6. How many moles are in 16.5 g C. How many
atome of Carbon is this?
7. Define isotope.
8. Feo is dug up in rock form. The rock weighs 2500
porn grams. b How much iron can be pulled out. percent composition question) We also discuss several other topics like What makes a sample well represented?
Don't forget about the age old question of What is used for lactate production or shuttles electrons?
91 A compound has the composition 35.00% If you want to learn more check out Why do we have ap style?
Nitrogen, 59.96%. Oxygen, & remainder Hydrogen. What is the empirical formula?
a) Fe + O2
16) NH3 + O2
NO + H2O
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11. What mass of Oxygen is required to complete a
reaction of 25. Oy Glucose (Co HizOc) CH.2. О, тоо, осо, +6H2O
12.1f 400.00 grams of CH3OH are actually made,
Whats the percent yield? We also discuss several other topics like What is a disorder of connective tissue that creates hyper elasticity in connective tissue?
13. o. Soluble or NOT?
a) Naci b)KF
14. The atomic # of f is?
15. What's the oxidation #of carbon on CO?
16. What is the names of these elements?
d) SF6 17 Asubtance has an empirical formula CH2 Br
& a molar mass of 188 9/mon. What is the molecular formula?
18. Suppose 356g of CO & 65.0 g of Hz are mixed.
Identify the limiting & excess reactants.
ANSWER KEY 1. a) 3.58.1013 I b28.
75kg 1103 g 100 mg = 750,000mg
1 kg Tig
b) 65 kg 110009
Tikg = 65,000g 3. a) precise b) accurate
asen 13.58= 13.58V 5.5000 Lä.03682 mb_---- 5. Protons - 3 electrons-3 Neutrons - 4
6.16.5g Cllmola - 1.37 moic
112.019 1.37 mol C 16.0210-atoms. : 8.25 · 1023 atoms c
limol C 7. Atom with same atomic numbers, but different
atomic masses. These are the same elements LWL alferent #s of neutrons). 8. Molar Mass of Fe: 55.85.100= 77.73%
Molar Mass of Fe 0: 71.85 77.739. of 2500 grams = 1943 grams fe
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9.35g NILIAN =2.5 mol N 59.9690 lmoso = 3.75 moto No .
Tiego 5.049 H1 m- 5 moi H NH.NO,
ANSWER KEY 10. a) 4 Fe + 302 → 2Fe2O3 L b) 4NH3 +502 ~ 4 NO + 6H2O 11. 25.0g Ca Hiz O6/lmol 16 mol O2 .83.25 mol O2
180.18g 11 mol Co Hizo
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Sonotre assoluble) contain alkali
b) soluble} metals
16. a) dinitrogen pentoxide
c) carbon monoxide _d) sulfurhexafluoride 17. C2 Hu Brzo 18, 3569 Colimorco 12 mol CH3 OHL 12.7 morco
128gco Timolco 65.0 q Elz 11 mol mol CH3OH - 16. 1 mol H2
72.02g Hz 12 mol H2 12.7 mol<16.1 mol so CO ss limiting & Hz is in excess