chemistry final

which of the following reactions would be classified as a combustion reaction? 1. C6H12O6 (aq) ---> 2 CH3CH2 OH (aq) 2. 2 H2O2 (l) ---> H2O (I ) + O2 (g) 3. CH4 (g) + 2 O2 (g) ---> CO2 (g) + 2 H2O (l)

CH4 (g) + 2 O2 (g) ---> CO2 (g) + 2 H2O (l)

if you overcook an egg, the yolk turns a greenish color. this is due to iron sulfide. which of the following is a valid ionic formula for iron (lll) sulfide 1. FeS 2. Fe2S3 3. Fe3S2 4. IS 5. I2S3

Fe2S3

what is the symbol of the element in group 2A and period 3

Mg

which is the correct formula for a polyatomic atom 1. SH- 2. NO+ 3. PO 4 3- 4. OH 2- 5. CO3 2+

PO 4 3-

which of the following elements is a transition metal? 1. K 2. F 3. Ca 4. Zn 5. O

Zn

what is hydroxide ion in the following reaction OH- + H2O --> H3O+ +O2- 1. acid 2. base 3. conjugate acid 4. conjugate base

acid

in order for a reaction to occur, reactant molecules must collide with enough energy to overcome an energy barrier. what is this energy barrier called 1. energy 2. enthalpy 3. activation energy

activation energy

radium (Ra) is located in which family of the periodic table

alkaline earth metals

water can react as both an acid and a base, depending on its environment. because of this characteristic, water is an _______ molecule 1. amphoteric 2. Autonomous 3. complex 4. reactive 5. conjugated

amphoteric

the octet rule indicates that

atoms lose, gain, or share valence electrons to have 8 valence electrons

Li+ batterie are found in Apple iPhones. this is an example of an 1. elements 2. compound 3. mixture 4. anion 5. cation

cation

please identify the halogen in the following list 1. helium 2. nitrogen 3. oxygen 4. gold 4. chlorine

chlorine

red blood cells are placed into a 7% NaCl solution. the cells begin to shrink upon observation. this is an example of 1. crenation 2. hemolysis 3,. osmosis 4. dialysis 5. none of the above

crenation

solids are molecules that have a _______ shape and ________ volume

definite, definite

the correct name for the compound for laughing gas, N2O is 1. nitrogen oxide 2. nitrogen dioxide 3. dinitride trioxide 4. dinitrogen monoxide 5. dinitrogen trioxide

dinitrogen monoxide

in Charles law, the volume of a gas increases when the temperature increases. this is an example of a _________ relationship

direct

the number of protons is equal to the number of ________ in a neutral atom

electrons

which element is the most electronegative 1. hydrogen 2. fluorine 3. oxygen 4. calcium 5. iron

fluorine

bronze is composed of 88% copper and 12% tin. this is an example of a 1. homogeneous mixture 2. heterogeneous mixture 3. solution 4. pure substance 5. element

heterogeneous mixture

in which of the following would have the highest kinetic energy? 1. ice at -20 C 2. water at 20 C 3. water at 85 C

ice at -20 C

valence electrons are electrons located

in the outermost energy level of an atom

in Boyles law, the pressure _________ as the volume _______

increases, decreases

when an element has the same number of protons but a different number of neutrons, this is called an 1. anion 2. cation 3. isotope 4. compound 5. mixture

isotope

coffee is an acidic solution. its pH would be 1. less than 7 2. 7 3. more than 7

less than 7

which of the following element is a metal 1. nitrogen 2. lithium 3. chlorine 4. carbon 5. oxygen

lithium

octane C8H18 is considered a __________ molecule

non polar

does a pen sitting on a table describe the potential energy of an object?

yes

is rubbing alcohol a polar solvent and is it soluble in water?

yes, because they are both polar

in table salt, NaCl, the charge on the chlorine is 1. 0 2. -1 3. +1 4. -2 5. +2

-1

a patients blood test shows that his chloride level is 101 mmol/L. please find the molarity of chloride in the patients blood. 1. 101 M 2. 1.01 m 3. .101 M

.101 M

how many grams of NH3 are produced if 5g of N2 are used for the following reaction? N2 + H2 ---> NH3 1. 4.1 2. 12.1 3. 16.5 look at question 30 to know how to solve

12.1

calculate the molecular mass of aspirin, C9H804

180 g/mol. 108+8+64= 180

what is the % (m/v) when 8.0 g of glucose is used to prepare a 400 mL glucose solution? 1. 2% 2. 0.02%

2%

Americans consume an additional 40.8 kg of sugar per year. what is the mass of the sugar in lb? 1. 18.5 lb 2. 90 lb 3. 135 lb 4. 198 lb 5. 437 lb

90 lb.... 40.8x2.2=89.76 which = 90

a can of mountain dew has 36 mg of caffeine in 8 oz. how much caffeine would be in a 20 oz container

90mg. 36/8=4.5 then 4.5x20=90

a patient suffering from hypertension has a blood pressure of 155/92. was is their diastolic pressure in atm? 1. .21 2. 1.12 3. .12 4. 117800 5. 69920

.12

how many moles are there in 35.1 g of Ca(OH)2 1. .47 2. 2,597 3. .60 4. 2,036 5. .31

.47

how many moles of H2O are produced from 7.9g C4H8 based upon the following reaction? C4H8 + 02 ---> CO2 + H20 1. .03 2. .14 3. 110.6 4. .56

.56

a liquid has a volume of 50 mL and a mass of 4g. what is the density of the liquid?

0.08 g/mL. 4/50=.08

tetracycline is prescribed to a 84-lb child at a dosage of 35mg/kg tetracycline per day. what is the daily dose of tetracycline that should be administered to the child? 1. 5.3 mg 2. 53 mg 3. 1.3 mg 4. 1.3 g 5. 2.9 g

1.3 G

a largest kidney stone weighs 2.2 lb. how many grams is this equivalent to

1000 g

what is the molar mass of sodium carbonate, Na2CO3? 1. 106 g/mol 2. 79 g/mol 3. 124 g/mol

106 g/mol. 46+12+48= 106

a cyclopropane-oxygen mixture is used as an anesthetic. if the partial pressure of cyclopropane in the mixture is 330 mmHg and the partial pressure of the oxygen os 1.0 atm, what is the total pressure of the mixture in torr? 1. 335.6 2. 431.2 3. 760.5 4. 1.43 5. 1090

1090

during metabolism, table sugar (sucrose) is broken into monosaccharides. according to the following chemical equation, how many moles of monosaccharides will be produced when 6 moles of sucrose react with 6 moles of water? C12H22011 + H2O ---> 2 C6H12O6 sucrose monosaccharides 1. 2 2. 4 3. 6 4. 12

12

ivermectin is used to treat dogs with intestinal parasites. the dosage is 10.5 ug/kg. how much ivermectin should you give to a 15kg dog?

157.5 ug. 10.5x15=157.5

how many mols of N2 are needed to balance the following equation? N2 + O2 --> N2O5 1. 1 2. 2 3. 3

2

the number of. neutrons in helium (He) is

2

the following reaction is an example of a _________________ reaction 3Ba(OH)2+2H3PO4--> Ba3(PO4)2+6H2O

neutralization

in a molecule with covalent bonding two _______________ atoms are held together by sharing some/all of their valence electrons

nonmetals

the bond between C and H is always

polar

we refrigerate foods in order to ______ the rate of reaction by ______ the activation energy. 1. slow down, increasing 2. slow down, decreasing 3. speed up, decreasing

slow down, increasing

the correct name for NaOH would be

sodium hydroxide

a bottle of calamine lotion should be shaken before use. this is an example of a: 1. solution 2. colloid 3. suspension 4. solute 5. aggregate

suspension

the molecular shape of carbon tetra bromide, CBr4, is 1. linear 2. trigonal planar 3. trigonal pyramidal 4. tetrahedral 5. bent

tetrahedral

one slice of angel food cake has 72 calories while 1 slice of devils food cake has 220 calories. which one will give you the most energy? HINT 1 calorie = 4.184 kJ

the devil food cake

is H2CO3 and HCO3- a buffer system?

yes

what is the charge on TIN in the ionic compound SnF2? 1. +2 2. +1 3. 0 4. -1 5. -2

+2

the element on the periodic table with 29 electrons has the atomic symbol:

Cu

how many moles of carbon are in 27.1 g of carbon? 1. 2.26 2. 325 3. 4.52

2.26. 27.1/12.01= 2.256 = 2.26

iodide-131 is used to treat thyroid cancer. it has a half-life of 8 days. a patient is given a 10g treatment on August 1. how much (g) iodide-131 would be in their system on August 17?

2.5

a doctors order is .125 g of penicillin. the liquid medication contains 250 mg/ 5 mL. how many milliliters of the suspension are required? 1. .0025 mL 2. 5.0 mL 3. 2.5 mL 4. 6.3 mL 5. .0063 mL

2.5 mL

windex glass cleaner has a pH of 11.4. what is the [OH-] 1. 3.98x 10 -12 M 2. 2.51x 10 -3 M 3. 2.51x 10 -4 M

2.51x10 -3 M

the temperature on a warm spring day is 20 C. what is the temperature in Kelvin?

293K. 273+20=293

how many significant figures are in the number 0.0000950

3

what is the number of significant figures in 3090

3

apple juice has a [H3O+] of 7.94 x 10-4. what is its pH? 1. 1.3 2. 3.1 3. 10.9 4. 9.10 5. -3.1

3.1

if a neutral atom has 30 protons and 34 neutrons. the atomic number of the element is

30

how many grams are there in 200 mmol of glucose, C6H1206? 1. .9 2. 36 3. 180

36

a patient is given a dosage of amoxicillin (10 mg/kg) every 8 hours. the patient weighs 150 lb. Amoxicillin comes in tablet form where there is 500 mg per tablet. how many tablets must this patient take daily?

4. there is 24 hours in a day and the patient takes it every 8 hours so 8x4= 24 so you take 4 daily

please convert 52.6 ul to ml 1. 5.26x10 -3 2. 5.26x10 3 3. 5.26x10 2 4. 5.26x10 -2 5. 5.26x10 10

5.26x10 -2

carbamazepine is an antiepileptic. a daily dose is 1100 mg. if carbamazepine is available as a suspension containing 1.0 g in 5.0 mL, how many mL of the suspension should be given daily? 1. .22 mL 2. 5.5 mL 3. 22 mL 4. 220 mL 5. 5500 mL

5.5 mL

how many electrons are in the iodide ion 1- 1. 53 2. 54 3. 74 4. 127 5. 128

54

in a triple bond, a total of _______ electrons are shared in a Lewis dot structure

6

how many grams of CO2 are produced from 125g of O2? CH4 + 2 O2 --> CO2 + 2 H20 1. 125 2. 250 3. 85.9

85.9