CNS-GEAS 3 Chemistry

GCNS: GEAS 31. A 5 lb monkey is attached to a 20 ft hanging rope that weighs 0.3 lb/ft. The

monkey climbs the rope up to the top. How much work has it done.ANS. 160 ft. – lb.

2. A 40 kg. block is resting on an inclined plane making an angle of θ from the horizontal. Coefficient of friction is 0.60, find the value of θ when a force of P = 36.32 is applied to cause motion upward along the plane.

Ans: 20o

3. A rectangular block having a width of 8 cm and a height of 20 cm. is resting on a horizontal plane. If the coefficient of friction between the horizontal plane and the block is 0.40, at what point above the horizontal plane should a horizontal force P will be applied at which tipping will occur?

Ans: 10 cm.

4. A spring with a natural length of 10 cm. is stretched by ½ cm. by a 12 Newton force. Find the work done in stretching the spring from 10 cm to 18 cm. Express your answer in joules.

Ans: 7.68 Joules

5. A block weighing 400 kg us placed on an inclined plane making an angle of θ from the horizontal. If the coefficient of friction between the block and the inclined plane is 0.30, find the value of θ, when the block impends to slide downward.Ans: 16.70o

W = cosθ=N F = μN

F = Wsinθ μN = Wsinθ μWcosθ = Wsinθ tanθ = μ tanθ = 0.30

θ = 16.70o

6. A certain cable is suspended between two supports at the same elevation and 50 cm apart. The load is 50 N per meter horizontal length including the weight of the cable. The sag of the cable is 3 m. Calculate the total length of the cable.Ans: 50.4758 m

7. The cable supported at 2 points of the same level has a unit weight of W of 0.02 kg per meter of horizontal distance. The allowable sag is 0.02 m and a maximum tension at the lowest point of 1200 kg. and a factor of safety of 2. Calculate the allowable spacing of the poles assuming a parabolic cable.Ans: 69.28 m

8. A cable of 800 m long weighing 1.5 kN/m has tension of 750 kN at each end. Compute the maximum sag of the cable.Ans: 200 m

9. An object experiences rectilinear acceleration at a(t)10-2t. how far doe it travel in 6 seconds if its initial velocity is 10m/s.Ans: 168m

10. An object is accelerating to the right along a straight path at 2m/sec? the object begins with a velocity of 10m/s to the left. How far does it travel in 15 seconds?Ans: 125 m

11. A shot is fired at an angle of 45o with the horizontal and a velocity of 300 fps. Calculate to the nearest, the range of the projectile.Ans: 932 yds

12. A solid disk flywheel (I=200 kg-m) is rotating with a speed of 200 rpm. What is the rotational kinetic energy?Ans: 888 x 103 J

13. A man borrowed P2000 from a bank and promise to pay the amount for one year. He received only the amount of P1,920 after the bank collected an advance interest of P80. What is the rate of discount and the rate of interest that the bank collected in advance.Ans: 4%, 4.17%

14. A bill for motorboat specifies the cost as P1,200 due at the end of 100 days but offers a 4% discount for cash in 30 days. What is the highest rate, simple interest at which the buyer can afford to borrow money in order to take advantage of the discount?Ans: 21.4%

15. Find the discount of P2000 is discounted for 6 months at 8% simple discount.Ans: P80

16. If the rate of interest is 12% compounded annually, find the equivalent rate of interest if it is compounded quarterly.Ans: 11.49%

17. How long will it take money to double itself if invested at 5% compounded annually?Ans: 14 years

18. A person borrows 10, 000 from a credit union. In repaying the debt he has to pay 500 at the end of every three months on the principal and a simple interest of 18% on the amount outstanding at that time. Determine the total amount he has paid after paying all his debt.Ans: P9,725

=the total amnt. paid on the principal in 1 year will be 4(500)=2,000. Thus, he will be able to repay the debt after 10,000/2,000=5 years. He will have made 20 payments. The interest rate for each period =18%/4=4.5%=0.045

Interest paid on first payment=0.045(10,000)=450.00Interest paid on 2nd payment=0.045(9,500)=427.50Interest paid on 3 rd payment=0.045(9,000)=405.00

Interest paid on 20th payment=0.045(500)= 22.50Total interest paid=450.00+427.5+…+22.5This is an arithmethic progression whose sum is 20/2 (450+22.5)=4725.0Total amnt. Paid =5000+4725=9725

19. A man borrows 500 for one year at a discount rate of 8% per annum a.) How much does he actually receive? b.) What rate of interest is he actually paying?Ans: a.)460, b.)8.70%

20. A man borrows 2,000 for 18 months at a discount rate of 12% per annum. a.) How much does he actually receive? b.) What rate of interest is he actually paying?Ans: a.) P1,640.00, b.) 13.64%

21. A man borrows some money at a discount rate of 15% per annum for one year. If he wishes to receive 1,000, how much must he borrow?Ans: 1,176.47

22. Find the amount at the end of 8 years if 1,000 is invested at 6% per annum compounded a.) mothly b.) quarterlyAns a.) 1,614.14 b.) 1,610.32

23. How much must be invested now in order to have 10,000 at the end of 10 years if interest is paid at the rate of 6% per annum compounded a.) annually b.) semi-annually?Ans. A.) 5,583.95 b.) 5,536.76

24. Find the effective rate if interest is compounded quarterly at the nominal rate of 9.6% per anum.Ans. 9.95 %

25. How many years will it take for an investment to a.) double itself, b.) to triple itself if invested at the rate of 4% compounded annually?Ans. a.) 18 years b.) 28 years

26. Find the effective rate if interest is compounded monthly at the nominal rate of 12% per annum.Ans. 12.68%

27. A compressor can be purchased with a down payment of 8,000 and equal installments of 600 each paid at the end of every month for the next 12 months. If the money is worth 12% compounded monthly, determine the equivalent cash price of the compressor.Ans. 14,753.05

CHEMISTRY1. Which of the following

elements is not naturally found in the human body?a. manganeseb. sulfurc. irond. thorium *

2. This important tool provides most important information in one place on the elementsa. the Periodic Table *b. the octave rulec. chemical nomenclatured. the Bernouli rule

3. Rust is the material that is formed whena. copper is exposed to air

and moistureb. iron is exposed to oilc. titanium is exposed to oild. iron is exposed to air and

moisture *

4. In Australia, the temperature in January is often 24oC, what is it in Fahrenheit?a. 90b. 94c. 97d. 101 *

5. If 12 out of 48 songs become number 1 hits in a 6 months period, what percent reach number 1 in that period?a. 15%b. 20%c. 25% *d. 32%

6. Hadrons are made up ofa. mesons and orlonsb. baryons and nylonsc. baryons and mesons *d. mesons and quarons

7. Arsenic sulfide was added to whiten copper by alchemists, this step was calleda. melanosisb. leucosis *c. cystosisd. xanthosis

8. Nano is the Greek prefix fora. 102

b. 106

c. 109 *d. 1012

9. Color, form, density, electrical conductivity, and melting and boiling points are example ofa. liquid particlesb. physical properties *c. chemical propertiesd. solid properties

10. The first period contains how many elementsa. 2 *b. 4c. 6d. 8

11. Noble gases are also called the a. actinides b. chlorofluorocarbonsc. transuranic elementsd. inert gases *

12. Seawater is an example of aa. homogeneous solution *b. isotonic solutionc. heterogeneous solutiond. pasteurized solution

13. Sodium hypochlorite is commonly calleda. ammoniab. saltpeterc. bleach *d. rock salt

14. Sulfur is a member ofa. halogensb. actinidesc. inner transition metalsd. chalcogens *

15. Which of the following is not a type of quark?a. topb. magic *c. upd. bottom

16. Approximately what percentage of the elements are metals?a. 25%b. 40%c. 80% *d. 90%

17. The actinide series of elements area. all lighter than airb. radioactive *c. silver in colord. all found in nature

18. Diamonds have what kind of crystal structure?a. pentagonalb. planarc. ellipticald. cubic *

19. The molecular formula of fructose isa. C2H206

b. C6H12O6 *c. C6H10O2

d. C12H6O2

20. A molecule is thea. reduction of elements to

their basic structureb. combination of two or

more atoms held together by chemical bonds *

c. support framework for the atom’s inner sub-particles

d. Latin origin for the element molybdenum

21. The heavy zig-zag line to the right of the Periodic Table separatesa. metal saltsb. halogensc. the actinide seriesd. the metal and non-metals

*

22. A phasea. is a division between

metals and non-metalsb. something everyone goes

through at on time or another

c. describing the number of different homogeneous materials in a sample *

d. similar to the day and night cycle of the body

23. The halogens are alla. non-metals *b. hydrocarbonsc. metalsd. lighter than neon

24. Americium is a. a patriotic elementb. a member of the rare

earth (lanthanide) metals *

c. always a red metalloidd. has the chemical symbol

Ar

25. The atomic number of boron is

a. 5 *b. 8c. 10.8d. 12.2

26. A Bunsen burner isa. a type of chilib. a kind of sweet rollc. a heat source in the

laboratory *d. is invented by Sir

Alexander Bunsen

27. A cathode is another name for a. cat carrierb. positively charged

electrodec. carbon dating deviced. negatively charged

electrode *

28. Samples that can be broken down into simpler chemicals are known asa. particlesb. complexc. compounds *d. cubic

29. Transuranic elementsa. have two-letter shorthand

namesb. are not naturally

occurring *c. are made in light nuclei

reactionsd. are not highly defined

30. The total diameter of an atom is abouta. 100 times larger than the

nucleusb. 1,000 times larger than

the nucleusc. 10,000 times larger than

the nucleus *d. 100,00 times larger than

the nucleus

31. The shorthand chemical name for protactinium isa. Ptb. Prc. Od. Pa *

32. The periods have the following number elementsa. 2, 8, 8, 18, 18 *b. 2, 8, 12, 16, 18c. 2, 8, 10, 12, 18d. 2, 8, 10, 18, 18

33. Orbitals of the d-type come ina. sets of 2b. sets of 3c. sets of 5 *d. sets of 7

34. Bromine isa. commonly added to

toothpasteb. the only liquid nonmetal

at room temperature *c. an alkaline earth metald. never found as a vapor

35. The atomic number of neptunium isa. 37b. 42c. 93 *d. 101

36. Who presented On the Relation of the Properties to the Atomic Weights of the Elements?a. Lars Nilsonb. Antoine Lavoisierc. Lothar Meyerd. Dimitri Mendeleyev *

37. It is 3oC in Edinburgh, Scotland, in February, what is that in oF in Portland, Maine?a. 29b. 45c. 63 *d. 71

38. If the shell of an orbital is 2n2 = 8, what is n?a. n=1b. n=2 *c. n=3 d. n=4

39. Early humans thought rust wasa. red-brown dirtb. a mystery *c. a trick of the eyed. a problem with the

sample

40. The lanthanides and actinides are also called thea. noble gasesb. halogensc. heavy metalsd. inner transition metals *

41. Common table salt is made up ofa. lithium chlorideb. potassium chloridec. sodium chloride *d. cesium chloride

42. Fer is the French name for the elementa. iron *b. phosporus chloridec. sodium chloride *d. cesium chloride

43. The pH of milk is roughlya. 5.4b. 6.4 *c. 7.4d. 8.4

44. Oxygen’s filled is orbital diagram has how many up and down arrows?a. 1b. 2 *c. 3d. 4

45. The Pauli exclusion principle was written bya. Alfredo Paulib. Pablo Paulic. Wolfgang Pauli *d. Jane Pauli

46. When all orbitals of a certain sublevel have to be occupied by a single electron before pairing starts, it is known asa. the Pauli exclusion

principleb. Schrodinger’s equationc. William’s ruled. Hund’s rule *

47. Oxidation describesa. electron (+) gainb. electron (-) lossc. a helpful diet plan *d. a better spending plan

48. Nitrogen reacts with which element to form ammonia?a. hydrogen *b. oxygenc. chorined. lithium

49. Mixtures can be divided into two typesa. up and downb. homogeneous and

heterogeneous *c. thick and thind. sweet and sour

50. The combing power of one element with the atoms of another is calleda. groupingb. sensitivityc. valence *d. nomenclature

51. This elements make up 25% of the earths elementsa. phosphorusb. potassiumc. calcium d. silicon *

52. Early alchemist related the planet Mars to which element?a. iron *b. goldc. leadd. mercury

53. The first step the alchemists took to change a metal to gold wasa. to heat heaterb. to get a good night’s

sleepc. called melanosis *d. to check the weather

54. There are how many base units in the International System of Units(SI)?a. 4b. 5c. 7 *d. 9

55. A thermometer measuresa. color gradientsb. a themosc. volumed. temperature *

56. The shorthand chemical name of bismuth isa. Bi *b. Bmc. Bsd. Bt

57. Metals that are ductile means thata. they are used as a

supplement in duck foodb. they can pulled into wires

*c. they can be flattened into

sheetsd. they are used in air-

conditioning ducts

58. The Nobel Prize for chemistry is awarded to chemistsa. who can chew gum and

ump on foot at the same time

b. studying in Switzerlandc. with really big

laboratoriesd. who discover something

new or explain something not well understood *

59. If the temperature of sample is 14oC, what is the temperature in kelvin?a. 224 kelvinb. 259 kelvinc. 287 kelvin *d. 295 kelvin

60. Two electrons in each filled orbital must bea. opposite in charge *b. really cozyc. chemistsd. of the same charge

61. About 1% of the earth resources are made up of thus element.a. siliconb. manganesec. phosphorus *d. magnesium

62. These elements are usually shiny and good conductors of heat and electricitya. halogens b. metals *c. noble gasesd. non-metals

63. The pH of bleach isa. 5.0b. 7.4c. 9.2d. 14.0 *

64. Ice is the solid form of a. leadb. heliumc. water *d. crystals

65. NASA Spinoffs are an example ofa. government insightsb. applied science *

c. space equipment used only in space

d. pure science

66. Early alchemists used this to represent the elements.a. Greek lettersb. sign languagec. Arabic letterd. signs of planets *

67. The SI standard unit for mass is the a. gramb. poundc. kilogram *d. bushel

68. Which of the following is not a correct measurement?a. grams per litterb. degrees Fahrenheitc. kilometers per hourd. degrees per meter *

69. The atomic number of hydrogen is a. the same as its atomic

weight *b. not knownc. only calculated when in

solid formd. 2

70. Elements found along the border of metals and non-metals are calleda. transition metalsb. noble glassesc. metalloids *d. rare earth metals

71. Kvicksilver is the Swedish name fora. potassiumb. mercury *c. silverd. tin

72. Thorium is part of which group?a. halogensb. lanthanidesc. actinides *d. metals

73. Nearly 2% of the earths elements is made up of this elementa. calcium *b. chlorinec. strontiumd. zinc

74. Early alchemists related the planet Jupiter to which element?a. goldb. titaniumc. silverd. tin *

75. Which Greek philosopher called tiny particles atomos (atoms) ?a. Platob. Aristotle *c. Democritus

d. Lucretius

76. The distance from the sun to Pluto is roughlya. 108 metersb. 10 13 metersc. 1010 meters *d. too far to think about

77. Hydrogen and Helium are located in which period?a. first *b. secondc. third d. fourth

78. The SI standard unit to measure a pure substance is the a. chipmunkb. gopherc. mole *d. squirrel

79. Gallium was discovered one year beforea. copperb. germanium *c. calciumd. selenium

80. In a binary covalent compound, phosphorus is named before which of the following elements?a. carbonb. siliconc. borond. chlorine *

81. In an ion of one atom, the oxidation number is equal toa. twob. zeroc. the ion’s charge *d. the ion’s atomic weight

82. The iron form of permanganate isa. MnO4

- *b. MgO2

–

c. MdH2–

d. PO4-

83. Which of the following would not be considered toxic at this ppm levela. silver (0.05 ppm in water)b. arsenic (0.5 ppm) *c. diethyl ether (400 ppm)d. mercury (0.0022 ppm in

water)

84. The word radioactivity was first used bya. Lothar Meyerb. Platoc. Han Christian Andersend. Marie Curie *

85. Which element is the only one that has been given separate names for its different isotopes?a. hydrogen *b. nitrogenc. idodined. carbon

86. The two types of nuclear reactions are radioactive decay of bonds and the a. “billiard ball” type *b. “tennis ball” typec. “golf ball” typed. “ping pong ball” type

87. The electronegativity value of lead isa. 0.6b. 1.5c. 1.7d. 2.2 *

88. Six-sided structure with alternating single and double bond are calleda. inverse isomersb. orbitalsc. aromatic hydrocarbons *d. noble gases

89. Lead forms how many kinds of ions with unique chargesa. 1b. 2 *c. 3d. 4

90. What is approximately the pH level of blood?a. 6.5b. 7.0c. 7.4 *d. 8.0

91. All oxidation numbers added together in a compound must equala. zero *b. onec. the total number of atomsd. enough to make the

experiment working

92. The B-subgroup of elements are also calleda. transition elements *b. metalsc. halogensd. gases

93. Which of the following is an aromatic compound?a. methanolb. ethanolc. butaned. cinnemaldehyde *

94. Radioactive iodine is used in the marking and treatment ofa. emphysemab. thyroid cancer *c. flat feetd. halitosis

95. Molecules with chiral isomers area. not superimposable *b. acid-base pairsc. superimposabled. elastomers

96. In binary covalent compound, sulfur is named before which of the following elements?a. carbon

b. oxygen *c. borond. hydrogen

97. How many elements are there in the sixth period?a. 10b. 28c. 32 *d. 40

98. Early alchemist related the planet Saturn to what element?a. boron b. lead *c. sulfurd. scandium

99. A pH meter measures the amount ofa. hydrogen ions in a

solution *b. oxygen ions in a solutionc. nitrogen in a solutiond. sodium ions in a solution

100. The pH of most carbonated drinks is abouta. 3.1b. 3.9 *c. 6.2d. 8.5

101. The measurement of the charge separation between each part of a molecule is calleda. an extra-terrestrial

momentb. an embarrassing momentc. a tripole momentd. a dipole moment *

102. The size of an average water molecule isa. 10-2 metersb. 10-4 metersc. 10-8 meters *d. 10-10 meters

103. Lawrencium is located in which perioda. thirdb. fourthc. sixthd. seventh *

104. If the shell capacity of an orbital is 2n2=32, what is n?a. n=1b. n=2c. n=3d. n=4 *

105. Hierro is the Spanish name fora. leadb. iron *c. mercuryd. hydrogen

106. Covalent bonds occur between twoa. basesb. metalsc. non-metals *d. a metal and a non-metal

107. If the temperature of a sample is 273 Kelvin, what is the temperature in Co?a. 0 *b. 10c. 32d. 73

108. Which element melts in your hand like a chocolate bar?a. kryptonb. tantalumc. strontiumd. cesium *

109. Carbon single-walled, nano-scale tubular structures are calleda. buck ballsb. rare earth metalsc. nanotubes *d. chalogens

110. One of the first acids a beginning chemistry student uses in the lab isa. hydrocholoric acid *b. cyanoic acidc. propionic acidd. barbaric acid

111. Proteins give hard structural strength in all but which of the following?a. ankle boneb. crab shellc. spinal columnd. earthworm *

112. The electronegativoty value of hafnium isa. 0.7b. 1.3 *c. 1.8d. 2.2

113. Lutetium is part of which group?a. halogensb. lanthanides *c. actinidesd. metals

114. What is the approximate pH of stomach acid?a. 2.0*b. 4.9c. 6.2d. 7.5

115. Many people with milk sensitivities have trouble with the milk sugara. fructoseb. lactose *c. sucrosed. glucose

116. If a solution measured 5.8 on the pH meter, it would bea. a radioactive solutionb. a noble gasc. a based. an acid *

117. Lithium paper changes from blue to red when a solution tested is a

a. a blue dyeb. an acid *c. a red dyed. a base

118. Bases react with acids to forma. dark chocolate and white

chocolateb. acetone and water c. water and salt *d. propane and butane

119. An uncombined element has an oxidation number ofa. 0 *b. 1c. 2d. 3

120. In a binary covalent compound, iodine is named before which of the following elements?a. bromine *b. siliconc. sulfurd. nitrogen

121. Early chemist related the planet Venus to which element?a. iodineb. copper *c. potassiumd. sodium

122. The SI standard unit for length isa. centimeterb. decimeterc. meter *d. kilometer

123. Cesium is located in which period?a. secondb. thirdc. fifthd. sixth *

124. The pH of vinegar isa. 3.0 *b. 3.6c. 4.2d. 5.0

125. Nickel forms how many kinds of ions with unique charges?a. 1b. 2c. 3d. 4 *

126. Which of the following is an aromatic compound?a. propanolb. isobutenec. vanillin *d. ethylene

127. Which of the following is the most widely produced acid in the United States?a. sulfuric acid *b. nitric acidc. boric acidd. malic acid

128. If a solution measured 7.7 on the pH meter, it would be

a. a halogenb. a basec. a macromolecule *d. an acid

129. If a solution measured 8.9 on the pH meter, it would bea. a brittle solidb. an inert gasc. a base *d. an acid

130. When oxygen is part of a compound the oxidation number is -2 excepta. saltb. peroxides *c. hydrocarbonsd. nanomolecules

131. If the temperature of a sample is 343 Kelvin, what is the temperature in oC?a. 50 oCb. 90 oCc. 70 oC *d. 110 oC

132. Early alchemist related the Sun to which element?a. gold * b. silverc. copperd. iron

133. In 1923, two chemists, Johannes Bronsted and Thomas Lowry, described a. mesons and hadronsb. acids and bases in the

scientific literature *c. the Periodic Tabled. how to construct

nanotubes

134. Litmus paper changes from red to blue when a solution tested is a. a blue dyeb. an acidc. a red dyed. a base *

135. Which of the compounds below do most people learn about first in chemistry?a. lavab. vanillinc. water *d. ozone

136. Reduction is the chemical name fora. when a balloon loses air

and shrinksb. a decrease in oxidation

number *c. the loss of energy from a

gasd. the process of writing a

name on a grain of rice

137. Oxygen has an oxidation number ofa. -1b. -2 *c. -3d. -4

138. Helium is how many times dense than water?a. 2 times *b. 3 timesc. 4 times d. Helium is the same

density as hydrogen

139. The invention of the Gutenberg printing press in 1452 helped spread which theory?a. Theory of Relativityb. Nano-technology Theoryc. Conservation of Energy

Theoryd. Atomic Theory *

140. In 1995, three chemists, Molina, Rowland and Crutzen became concerned about damage to thea. polar ice capsb. ozone layerc. Golden Gate Bridge *d. Canadian Bridge

141. Chemically, simple sugars are also known asa. something to avoid when

on a dietb. monosaccharides *c. the only cause of dental

cavitiesd. disaccharides

142. Antimony forms how many kinds of ions with unique charges?a. 1b. 2 *c. 3d. 4

143. Argon is located in which period?a. firstb. secondc. third *d. fourth

144. Early alchemists related the Moon to which element?a. manganeseb. vanadiumc. chromiumd. silver *

145. The pH of seawater is roughlya. 5.2b. 6.1c. 7.7 *d. 8.9