Chem 1411 Final
wPCl5+xH2O->yPOCl3+zHCl The above equation is properly balanced when: A) B) C) D) E)
D)
Express the number 0.000191 in scientific notation. A) 191×10^-6 B) 1.91×10^2 C) 1.91×10^4 D) 1.91×10^-4 E) 1.91×10^-3
D) 1.91×10^-4
Convert 0.2924 m to mm. A) 2.924*10^-3 B) 2.924*10^-4 C) 0.02924 mm D) 292.4 mm E) none of these
D) 292.4 mm
How many significant figures does the sum 8.50 201+1.93 contain? A)1 B)2 C)3 D) 4 E)5
D)4
All of the following are characteristics of metals except; A) B) C) D) E)
E)
I'm on side of iron has the formula Fe304. What mass percent of iron does it contain? A) B) C) D) E)
E)
The hall process for the production of aluminum involves the reaction of aluminum oxide with elemental carbon to give aluminum metal and carbon monoxide. Is the yield of this reaction is 82% and aluminum ore is 71% by mass aluminum oxide, what mass of aluminum ore must be mined in order to produce 1.0×10^3 kg (one metric ton) of aluminum metal by the hall process A) B) C) D) E)
E)
What is the mass of the Atoms of copper in grams? A) B) C) D) E)
E)
Which of the following atomic symbols is incorrect? A) B) C) D) E)
E)
Which of the following compounds has the same percent composition by mass as styrene, C8H8? A) B) C) D) E)
E)
You are given a compound with the formula MCL2, in which M is a metal. You are told that the metal ion has 25 electrons. What is the identity of the metal? A) B) C) D) E)
E)
Convert 24.3 lb to g. A) 5.36×10^-2 g B) 1.10×10^3 g C) 5.36×10^4 g D) 1.10×10^2 g E) 1.10×10^4 g
E) 1.10×10^4 g
The correct name for N^3- is A) B) C) D) E)
A)
The formula for lithium dihydrogen phosphate is A) B) C) D) E)
A)
How many liters are in a cubic foot? A)28.3 L B)56 L C)14 L D) 14.7 L E)128 L
A) 28.3 L
Using the rules of significant figures, calculate the following: 4.0021-0.247 A)3.755 B)4 C)3.7551 D) 3.76 E)3.8
A) 3.755
If you weigh 164 LB what is your weight in kilograms? A)74.4 kg B)164 g C)82 kg D) 90 kg E)75 kg
A) 74.4 kg
Which of the following names is are correct? 1. Sulfide,S^2- 2.ammonium chloride, NH4Cl 3. Acetic acid, HC2H3O2 4. Barium oxide, BaO A) all B) none C) 1,2 D) 3,4 E) 1,3,4
A) all
And Ion is formed A) B) C) D) E)
B)
Hydrochloric acid can be prepared by the following reaction: 2NaCl+H2SO4->2HCL+NA2SO4 How many grams of HCl can be prepared from 2.00 mil H2SO4 and 150 g NaCl? A) B) C) D) E)
B)
Indium reacts with chloride to form InCl3. In the balanced equation for this reaction, the coefficient of the indium trichloride is A) B) C) D) E)
B)
The chloride of rhenium contains 63.6% rhenium. What is the formula of this compound? A) B) C) D) E)
B)
The correct name for FEO is A) B) C) D) E)
B)
What is the mass of a 6.267 more sample of sodium hydroxide? A) B) C) D) E)
B)
When rubidium metal is exposed to air, two atoms of rubidium , Rb, combined with one atom of oxygen. Is 1.32 g of rubidium is exposed to air, what is the mass of the products in grams? A) B) C) D) E)
B)
Which of the following has 61 neutrons, 47 protons, and 46 electrons? A) B) C) D) E)
B)
Which of the following pairs is incorrect? A) B) C) D) E)
B)
The pressure of the earth's atmosphere at sea level is 14.7 lb/in^2. What is the pressure when expressed in kg/m ^2? A) 2.62*10^2 kg/m^2 B) 1.03*10^4 kg/m^2 C) 5.02*10^4 kg/m^2 D) 4.3*10^-3 kg/m^2 E) 2.09*10^-2 kg/m^2
B) 1.03*10^4 kg/m^2
4.25 seconds contain how many nanoseconds? A)4.25*10^7 B) 4.25*10^9 C) 4.25*10^12 D) 4.25*10^10 E) 4.25*10^8
B) 4.25*10^9
Express the quantity 4.53×10^ -5 km as cm. A) 4.53×10^-1 cm B) 4.53×10^0 cm C) 9.6×10^2 cm D) 1.587 cm E) 0.87 cm
B) 4.53×10^0 cm
What is the coefficient for oxygen when the following equation is balanced? NH3+O2->NO2+H2O A) B) C) D) E)
C)
Which is the following statements are true of uranium 238? I. Its chemical properties will be exactly like those of uranium 235 II. It's mass will be slightly different from that of an atom of uranium 235 III. It will contain a different number of protons than an atom of uranium 235 IV. It is more plentiful in nature than uranium 235 A) B) C) D) E)
C)
Which of the following equations is not balanced? A) B) C) D) E)
C)
Which of the following names is incorrect? A) B) C) D) E)
C)
A substances contains 35.0 g nitrogen, 5.05 g hydrogen, and 60.0 g of oxygen. How many grams of hydrogen are there in 179 g sample of this substance? A) B) C) D) E)
A)
Adopción As it contains 49.32% C, 43.84% O, and 6.85% H by mass. What is the empirical formula? A) B) C) D) E)
A)
Bromine exist naturally as a mixture of bromine 79 and bromine 81 isotopes. An atom of Bromine 79 contains A) B) C) D) E)
A)
Record the following in scientific notation to the correct number of significant figures. 48.5(168.292)(0.022)/16.92(0.03962)= A)2.7×10^2 B) 2.7×10^-2 C)4.7×10^-2 D) 27.0×10^0 E)2.698×10^-1
A) 2.7×10^2
A 20.0 mL sample of glycol has a mass of 25.4 g. What is the density of glycol in ounces/quart? (1.00 ounce = 28.4 grams, and 1.00 liters = 1.06 quarts) A) 42.2oz/qt B) 4.22×10^-2 oz/qt C)844 oz/qt D) 47.4 oz/qt E)26.2 oz/qt
A) 42.2oz/qt
The agreement of a particular value with the true value is called? A)Accuracy B) Error C) Percision D) Significance E)Certainty
A) accuracy
Order the four metric prefixs from smallest to largest. A) nano< mili < centi < deka B) mili <nano < centi < deka C) deka <centi < nano < mili D) centi < deka< mili < nano E) centi <nano < deka < mili
A) nano< mili < centi < deka
Which metals form cations with varying positive charges? A) transitional metals B). Group 1 metals C) Group 2 metals D). Group 3 metals E). Metalloids
A) transitional metals
How many significant figures does the product 8.52010×7.9 contain? A)2 B)3 C)4 D) 5 E)6
A)2
What is the mass of a metal sample if it displaces the water of a cylinder from 50.7 mL to 64.4 mL? The density of the metal is 2.70 g/mL A) 37.0 g B)-36.99 g C)2.125 g D) 120.8 g E)3.43 g
A)37.0 g
How many moles of hydrogen chlorine or 10 team in a 52.6 g sample of this gas? A) B) C) D) E)
B)
Suppose the reaction Ca3(PO4)2+3H2SO4->3CaSO4+2H3PO4 is carried out starting with 127 g of Ca3(PO4)2 and 71.9 g of H2 S04. How much phosphoric acid will be produced? A) B) C) D) E)
B)
The density of liquid chloroform is 1.48 g/mL. What is its density in units of lb/in^3? A) 1.70×10^-3 lb/in^3 B) 5.35×10^-2 lb/in^3 C) 1.10×10^-2 lb/in^3 D) 8.29×10^-3 lb/in^3 E) 0.199 lb/in^3
B) 5.35×10^-2 lb/in^3
All of the following are in aqueous solution. Which is Incorrectly named? A)HC2H3O2, acetic acid B) HBr, bromic acid C) H2SO3, sulfurous acid D) HNO2, nitrous acid E) HClO3, caloric acid
B) HBr, bromic acid
How many significant figures are in 1.3073 g A)6 B)5 C)4 D) 3 E)2
B)5
The formula for calcium bisulfate is A) B) C) D) E)
C)
I'm isotope, X, of a particular element has an atomic number of 15 and a mass number of 31. Therefore: A) B) C) D) E)
D)
Nitric oxide, and NO, is made from the oxidation of NH3, and the reaction is represented by her equation: 4NH3+5O2->4NO+6H2O What mass of O2 would required to react completely with 6.87 g of NH3? A) B) C) D) E)
D)
The element rhenium (Re) exist as two stable isotopes and 18 unstable isotopes. Rhenium 185 has in its nucleus A) B) C) D) E)
D)
Which of the following are incorrectly paired? A) B) C) D) E)
D)
You are asked to determine the perimeter of the cover of your textbook. You measure the length as 36.71 cm and the width as 24.83 cm. How many significant figures should you report for the perimeter? A) 1 B) 2 C) 3 D) 4 E) 5
D) 4
Express the number 0.047 in scientific notation. A)470×10^-4 B) 4.70×10^2 C) 4.7×10^-2 D) 4.70×10^-2 E) 0.470×10^-1
D) 4.70×10^-2
Express the number 0.0610 in scientific notation. A) 0.61*10^3 B) 61.0*10^0 C) 610*10^-4 D) 6.10*10^-2 E) 0.610*10^-1
D) 6.10*10^-2
424 kelvin equals A)151°F B)273°F C)697°F D) 151°C E)697°C
D)151°C
How many significant figures does the difference 218.7201 -218.63 contain? A)1 B)2 C)3 D) 5 E)7
A)1
A species with 12 protons and 10 electrons is A) B) C) D) E)
C)
For which compound is 0.256 more weight 12.8 g? A) B) C) D) E)
C)
Round up,an herbicide manufactured by Monsanto, had a formula C3H8NO5P. How many moles of molecules are there in a 304.3g sample of roundup? A) B) C) D) E)
C)
The refining of aluminum from bauxite ore (which contains 50% Al2O3 by mass) perceived by the overall reaction 2Al2O3+ 3C->4Al+3CO2. How much bauxite ore is required to give the 5.0×10^13 g of I am a man produce each year in the United States? (Assume 100% conversion.) A) B) C) D) E)
C)
Dry ice (carbon dioxide) changes from a solid to a gas at -78.5 c. What is the temperature in F? A)-173°F B)-12.6°F C)-109°F D) -75.6°F E) none of them are within 2°F of the right answer
C) -109°F
The distance from the earth to the sun is 93,000,000 miles. How many yards is this? A) 1.6×10^-11 yds B) 1.8*10^4 yds C)1.6*10^11 yds D) 1.587*10^11 yds E) 0.87*10^11yds
C) 1.6*10^11 yds
Using the rules of significant figures, calculate the following (6.167+51)/5.10 A) 9 B) 12 C) 11 D) 61 E) 11.0
C) 11
What is the best answer to report for the following calculation 78.58353-3.298+123.3335-2.17 A) 196 B) 197. 00 C)196.45 D) 188.86 E) 196.44903
C) 196.45
Which of the following pairs is incorrect? A)NH4Br, ammonium bromine B) K2CO3, potassium carbonate C) BaPO4, barium phosphate D)CuCl, copper (I) chloride E) MnO2, manganese (IV) oxide
C) BaPO4, barium phosphate
After carrying out the operations below, how many significant figures are appropriate to show in the result? (13.7+0.027)+8.221 A)1 B)2 C)3 D) 4 E)5
C)3
How many significant figures does the sum 8.530+2.7 contain? A)1 B)2 C)3 D) 4 E)5
C)3
The number 1.050*10^9 has how many significant figures? A)2 B)3 C)4 D) 3 E)2
C)4
A 5.95 g sample of AgNO3 is reacted with BaCl2 according to the equation 2AgNO3+BaCl2->2AgCl+Ba(NO3)2 To give 4.19 g of AgCl. What is the percent yield of AgCl? A) B) C) D) E)
D)
What is the coefficient for water when the following equation is balanced? As(OH)3(s)+H2SO4(aq)->As(SO4)3(aq)+H2O(l) A) B) C) D) E)
D)
Which among the following represents a set of isotopes? Atomic nuclei contain I. 20 protons and 20 neutrons II. 21 protons and 19 neutrons III. 22 neutrons and 18 protons IV. 20 protons and 22 neutrons V. 21 protons and 20 neutrons A) B) C) D) E)
D)
Which of the following is incorrectly named? A) B) C) D) E)
D)
A 20.0 mL sample of glycerol has a mass of 25.2 g. What is the mass of a 51 mL sample of glycerol? A)9.9 g B)40 g C)2.6×10^4 g D) 64 g E)64.3 g
D) 64 g
All of the following are in aqueous solution. Which is incorrectly named? A)H2SO4, sulfuric acid B)H2CO3, carbonic acid C)H3PO4, phosphoric acid D)HCN, cyanic acid E) HCl, hydrochloric acid
D) HCN, cyanic acid
Do the indicated arithmetic an given answer to the correct number of significant figures. (1.5X10^-4X61.3)+2.01= A)2.0192 B)2.0 C)2.019 D) 2.02 E)2.019195
D)2.02
What is the sum of the coefficient of the following equation when it is balanced using the smallest whole number? NaNH2+NaNO3->NaN3+NaOH+NH3 A) B) C) D) E)
E)
In the melting point of picolinc acid 136.5°C. What is the melting point of picolinic acid on the Fahrenheit scale? A) 107.8°F B). 245.7°F C)168.5°F D) 409.5°F E)277.7°F
E) 277.7°F
During a physics experiment, an electron is accelerated to 87% of the speed of light. What is the speed of electrons in miles per hour? A) 2.6×10^8 mi/h B) 5.8×10^11 mi/h C)6.7×10^8 mi/h D) 9.7×10^6 mi/h E)5.8×10^8 mi/h
E) 5.8×10^8 mi/h
Convert 40.8 mi to km. (1 m= 1.094 yd, 1 mi= 1760 yd) A) 4.46*10^1 km B) 2.54*10^1 km C) 6.56*10^7 km D) 3.73*10^1 km E) 6.56*10^1 km
E) 6.56*10^1 km
For which pair is the SI prefix not matched correctly with its meaning? A) tera = 10^12 B) centi = 0.01 C) Kilo = 1000 D) pico = 10^-12 E) deci = 10
E) deci = 10
The distance of 57 km equals. A) 5700m B) 0.57 m C) 570 m D) 0.057 E) 5.7*10^4
E)5.7*10^4
