NSC101 Chemistry for Engineering PDF

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Chemistry Chemistry for engineers final exam...

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NSCI101 - General Chemistry Assignment 001 Elements are arranged in the periodic table in order of increasing atomic number. Select one: True False

Elements can be decomposed into smaller substances. Select one: True False

The number of electrons and protons are equal in number. Select one: True False

The -ium ending on the name of hydronium indicates that it is a cation from metal atoms. Select one: True False

How many significant figures are in 0.000187? Select one: a. 3

b. 5 c. 4 d. 6

Accuracy is a measure of how closely individual measurements are to the actual or true value, while precision refers as to how closely individual measurements are to one another. Select one: True False

What is the mass number of an atom that has 5 protons, 5 electrons and 6 neutrons? Select one: a. 11 b. 10 c. 16 d. None of the choices

Convert 35.6 degrees Celsius to Fahrenheit Select one: a. 96.1 degrees Fahrenheit b. 2 degrees Fahrenheit c. 308.75 degrees Fahrenheit d. 69.1 degrees Fahrenheit

Which of the following statement is correct?

Select one: a. Empirical formula shows the actual number of atoms in a molecule. b. Both of the given choices are correct c. No correct answer d. Molecular formula shows only the relative ratio of each of each atom in a molecule

Using the periodic table, which element is in Group 2A period 5? Select one: a. Ba b. N c. Ra d. Sr

Short Quiz 001 What is the name of the compound that has 2 nitrogen and 4 oxygen? Select one: a. dinitrogen tetroxide b. nitrogen (II) oxide c. nitrogen tetroxide d. binitrogen tetroxide

are elements located in rows, while Select one: a. gases; period

are elements located in columns

b. period; group c. group; period d. no correct answer

Atomic number plus the number of neutrons is referred to as: Select one: a. Mass number b. Isotopes c. None of the choices d. Atomic number

Which ion is not correctly named? Select one: a. Ca2+, calcium (II) ion b. Fe3+, iron (III) ion c. Cr3+, chromium (III) ion d. O 22- , peroxide ion

Which of the following statement is true regarding atoms? Select one: a. Every atom does not have net electrical charge, thus the number of electrons and protons are equal in number. b. Both protons and neutrons reside inside the atom's nucleus c. Nucleus contains majority of the mass of an atom d. None of the choices

e. All of the given choices are correct

Compute the area given the following measurements: 2.0546 cm and 4.3 cm. Express the answer in significant figures. Select one: a. 8.9 cm2 b. 8.8 cm2 c. 8.8348 cm2 d. 8.83 cm2

What is the mass number of an atom that has 2 protons, 2 electrons and 4 neutrons? Select one: a. 4 b. None of the choices c. 8 d. 6

Which of the following statement is not true according to Dalton's atomic theory ? Select one: a. None of the choices b. Atoms are can be created or destroyed in a chemical reaction. c. Compounds are made up of a combination of atoms of more than one element d. Elements are made up of extremely tiny particles called atoms. e. All atoms of a given element are the same, but atoms of one element are different from the atoms of all other elements.

Which of the following statement is true regarding matter? Select one: a. States of matter can be converted from one state to another by having changes in temperature b. Both of the given choices are correct c. No correct answer d. States of matter can be converted from one state to another by having changes in pressure

How many significant figures are in 5.070 x 103 g? Select one: a. 3 b. 2 c. 4 d. 5

Assignment 002 In a balanced chemical equation, the number of atoms of an element on the left side is always the number of atoms on the right side. Select one: a. Equal to b. Less than c. Greater than d. Cannot be determined

The states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. Select one: a. Percent composition by mass b. Avogadro's number c. Law of conservation of mass d. Average atomic mass

The

_, is the percent by mass of each element in a compound.

Select one: a. Mass percent b. None of the choices c. Percent composition by mass d. Both of these

Suppose synthesis of Al2O3 is done in the lab using 20.50 g of Al and excess of O2. Upon purification, 35.48 grams of Al2O3 is produced. What is the percent yield of Al2O3? Select one: a. 57.78% b. 22.90% c. 45.80% d. 91.58%

mass is used in case of ionic compounds that do not contain discrete molecular units. Select one: a. Average Atomic

b. Formula c. Molecular d. Atomic

The reactant that is used up first in a reaction is called the

reagent.

Select one: a. Excess b. Limiting c. Both of these

In a reaction, the amount of

determines the amount of product.

Select one: a. Both of these b. Limiting reagent c. Excess reagent

is a process in which a substance or substances is transformed into one or more new substances Select one: a. Chemical reaction b. Percent composition by mass c. Percent yield d. Law of conservation of mass

Aluminum oxide, Al2O3, is synthesized by the reaction of aluminum, Al, and oxygen gas, O2. Which of the following equations correctly represent the reaction? Select one: a. 2Al + O3 → Al2O3 b. 2Al + 3O2 → 2Al2O3 c. Al + O2 → Al2O3 d. 4Al + 3O2 → 2Al2O3

is defined as the sum of the atomic masses in the molecule. Select one: a. Formula mass b. Average atomic mass c. Molecular mass/weight d. Atomic mass unit

Short Quiz 002 In a balanced chemical equation, the number of atoms of an element on the left side is always equal to the number of atoms on the right side. Select one: True False

The percent composition by mass of ferrous sulfide, FeS, is 50% Fe and 50% S. Select one: True

False

Given the percent composition by mass of all the elements in an unknown compound, we can always determine its molecular formula. Select one: True False

A percent yield of 100% is impossible to attain in the laboratory. Select one: True False

If 2 moles of AB4were made to react with 2 moles of C2, 1 moles of AC2 will be produced. Select one: True False

Iron, Fe, has an atomic mass of 55.85 amu therefore, the molar mass of Fe is 55.85 g/mol. Select one: True False

One mole of Phosphorus, with atomic mass of 30.97 amu, has greater number of atoms than one mole of Boron, with atomic mass of 10.81 amu. Select one:

True False

One mole of N2 contains 2*6.022 x 1023 molecules. Select one: True False

As long as we use stoichiometric amounts of reactants in a reaction carried out in the laboratory, we are guaranteed to get the theoretical yield of the reaction. Select one: True False

AB4+2C2->AC2+2B2C. If 100 grams of AB4 reacts with excess of C2, it will produce 100 grams of AC2. Select one: True False

Assignment 003 Which of the following statement is not true regarding kinetic molecular theory? Select one: a. Average kinetic energy of gas molecules is proportionate to absolute temperature. At an y given temperature, gas molecules have exactly similar average kinetic energy. b. Energy can be transferred when molecules collide with one another. However, at constant temperature, the average kinetic energy remains unchanged.

c. Forces between gas molecules, whether attractive or repulsive, are negligible. d. Gases are composed of large numbers of molecules that are in constant, random motion. e. Total volume of all the gas molecules is negligible in relation to the total volume where the gas is contained. f. None of the choices Which of the following can increase the pressure of a gas? Select one: a. Lower velocity b. Bigger container c. Smaller container d. Smaller number of molecules Dalton's law of partial pressure states that constant temperature and volume, the total pressure of a gas is proportional to the number of moles of gas present. Select one: a. inversely b. sometimes inversely, sometimes directly c. directly

Which of the following increases as work increases? Select one: a. No correct answer b. Distance c. Both force and distance d. Force

What is an example of endothermic process? Select one: a. Combustion of gasoline b. Burning sugar c. Ice melting d. Combustion of gasoline and burning sugar

e. Evaporating water f. Ice melting and evaporating water What is defined as the amount of heat needed to raise the temperature of 1gram of the substance by 1K or 1C? Select one: a. Enthalpy b. Heat capacity c. Kinetic energy d. Specific heat Which gas law states that at constant pressure, the volume of a fixed amount of gas is directly proportional to its absolute temperature? Select one: a. Avogadro's Law b. Boyle's Law c. Charle's Law

is a combination of Boyle's, Charle's and Avogadro's laws. Select one: a. Dalton's Law of Partial Pressures b. No correct answer c. Kinetic Molecular Theory of Gases d. Ideal Gas Law

According to the kinetic molecular theory, average kinetic energy of gas molecules is proportional to absolute temperature. At any given temperature, gas molecules have exactly similar average kinetic energy. Select one: True False

Which of the following statement is true regarding Gas Laws?

Select one: a. All of the choices b. Avogadro's law states that at constant pressure, the volume of a fixed amount of gas is directly proportional to its absolute temperature c. Boyle's Law states that at a constant temperature, the volume of a fixed amount of gas is inversely proportional to its pressure d. Charle's Law states that at constant temperature and pressure, volume of gas is directly proportional to the number of moles of gas present

Short Quiz 003 Gases take up volume and shape of its container, are considered the least compressible state of matter and have the lowest density compared to solids and liquids. Select one: True False Partial pressure is defined as the amount of pressure exerted by each component gas in a mixture, which is independent of the pressure exerted by the other gases. Select one: True False According to the kinetic molecular theory, average kinetic energy of gas molecules is proportional to absolute temperature. At any given temperature, gas molecules have exactly similar average kinetic energy. Select one: True False Pressure is defined as the effect of a force applied to a surface and can be measured by means of a barometer or manometer. Select one: True False

Molar heat capacity is the amount of heat needed to raise the temperature of 1 mole of a substance by 1K or one degree celsius. Select one: True False

Charle's Law states that at a constant pressure, the volume of a fixed amount of gas is inversely proportional to its absolute temperature. Select one: True False Ideal Gas Law is expressed as PV=nRT. Select one: True False As the mass or speed increases, kinetic energy decreases. Select one: True False The internal energy of a system increases when heat is applied of work is done into it. Select one: True False

Positive ΔH means that heat is lost from the system into its surroundings, while negative enthalpy ΔH means that heat is absorbed by the system from its surroundings Select one: True False

Long Quiz 001 Higher temperature in gas means higher

.

Select one: a. None of the choices b. kinetic energy c. velocity d. Velocity and Kinetic energy

Suppose 20.50 g of Al reacts with excess O2, how many grams of Al2O3 is produced? (Molar Mass of Al2O3 is 101.96 g/mol) Select one: a. 154.94 grams b. 10.85 grams c. 38.74 grams d. 77.47 grams What is the name of the compound that has 2 sulfur and 10 fluorine? Select one: a. disulfurdecafluoride b. sulfur (II) fluoride c. bisulfurdecafluoride d. sulfur decafluorine

Compute the area given the following measurements: 3.7552 cm and 1.7 cm. Express the answer in significant figures. Select one: a. 6 cm2 b. 6.42 cm2 c. 6.4178 cm2 d. 6.4 cm2

Which gas law states that at a constant temperature, the volume of a fixed amount of gas is inversely proportional to its pressure? Select one: a. Boyle's Law b. Charle's Law c. Avogadro's Law

Which of the following statement is true regarding Dalton's atomic theory? Select one: a. Compounds are made up of a combination of atoms of more than one element b. All of the choices c. Elements are made up of extremely tiny particle s called atoms. d. All atoms of a given element are the same, but atoms of one element are different from the atoms of all other elements. e. Atoms are can neither be created nor destroyed in a chemical reaction.

How many significant figures are in 0.00002 Select one: a. 6 b. 3 c. 5 d. 1

Kinetic energy is expressed as; Select one:

How many significant figures are in 4.0300 x 103 g? Select one: a. 4 b. 2 c. 5 d. 3

How many grams of Carbon are in 600 grams of Resveratrol? (Note: Resveratrol, C14H12O3 is a compound usually found in grapes and some berries. The molar mass of this compound is 228.26 g/mol.) Select one: a. 36.8 grams b. 815.21 grams c. 63.96 grams d. 441.97 grams

Resveratrol, C14H12O3 is a compound usually found in grapes and some berries. The molar mass of this compound is 228.26 g/mol. How many moles of resveratrol are in 600 grams of sample? Select one: a. 5.26 moles b. 0.76 moles c. 0.38 moles d. 2.63 moles Using the periodic table, which element is in Group 4A period 6? Select one: a. Ti b. V c. Sn d. Pb

In reference to item 13, suppose synthesis of Al 2O3 is done in the lab using 20.50 g of Al and excess of O2. Upon purification, 30.33 grams of Al2O3 is produced. What is the percent yield of Al2O3? Select one: a. 147.95% b. 67.58% c. 78.29% d. 39.15% What is defined as the described as the sum of the internal energy and product of pressure and volume in a system? Select one: a. Specific heat b. Kinetic energy c. Enthalpy d. Heat capacity

Which of the following is true regarding specific heat? Select one: a. Defined as the amount of heat needed to raise the temperature of 1 gram of the substance by 1K or 1°C b. No correct answer c. Defined as the amount of heat needed to raise the temperature of 1 mole of a substance by 1K or 1°C. d. Both of the given statements are true What is the mass percent of Hydrogen, H, in resveratrol? Select one: a. 18.83% b. 5.31% c. 5.26% d. 19.02%

Which of the following is the correct formula of sulfurous acid? Select one: a. H2SO3 b. H2S c. HSO3 d. HS

Which of the following statement is true regarding the periodic table? Select one: a. Both of the given statements are correct b. No correct answer c. Metalloids are elements that possess both metallic and non-metallic properties d. Non-metals can be found on the upper right side of the periodic table

How many moles of Al is needed to produce 4 moles of Al2O3 Select one: a. 8 moles b. 1 mole c. 2 moles d. 4 moles

How many atoms of oxygen are in 1 mole of Resveratrol? (Note: Resveratrol, C14H12O3 is a compound usually found in grapes and some berries. The molar mass of this compound is 228.26 g/mol.) Select one: a. 2.01 x 1023 b. 18.06 x 1023 c. 6.02 x 1023 d. 12.04 x 1023

The empirical formula of an unknown compound was determined to be CH2O. A separate analysis to determine the molar mass was done. Results show that the molar mass is 360.36 g/mol. What is the molecular formula of the unknown compound? Select one: a. C6H12O6 b. C12H24O12 c. Cannot be determined d. C3H6O3 The difference between the mass number and the atomic number equals the number of in an atom. Select one: a. Electrons b. Protons c. Neutrons How many significant figures are in 0.0054 Select one: a. 3 b. 5 c. 2 d. 4 Which gas law states that at at constant temperature and pressure, volume of gas is directly proportional to the number of moles of gas present. Select one: a. Ideal Gas Law b. Charle's Law c. Boyle's Law d. Avogadro's Law

Which of the following statement is not true regarding kinetic molecular theory? Select one:

a. Average kinetic energy of gas molecules is proportionate to absolute temperature. At an y given temperature, gas molecules have exactly similar average kinetic energy. b. Energy can be transferred when molecules collide with one another. However, at constant temperature, the average kinetic energy remains unchanged. c. Forces between gas molecules, whether attractive or repulsive, are negligible. d. Total volume of all the gas molecules is negligible in relation to the total volume where the gas is contained. e. Gases are composed of large numbers of molecules that are in constant, random motion. f. None of the choices

Which of the following statement is true regarding balancing chemical equations? Select one: a. Both of the given statements are correct b. No correct answer c. Balance first those elements that appear in only one reactant and one product. Then, balance elements that appear in more than one reactant and product. d. The common convention for balanced equations is to use the smallest whole numbers

Dalton's law of partial pressure states that constant and volume, the total pressure of a gas is directl y proportional to the number of moles of gas present. Select one: a. pressure b. distance c. any of the given choices is correct d. temperature Copper, Cu, has two stable isotopes, 63Cu with atomic mass of 62.9 amu and 65Cu with atomic mass of 64.93 amu. The average atomic mass of Cu is 63.54. What are the percent abundances of the two isotopes? Select one: a. 1% 63Cu and 99% 65Cu b.

99% 63Cu and 1% 65Cu c. 30.5% 63Cu and 69.5 65Cu d. 69.5% 63Cu and 30.5 65Cu

Which of the following statement is true regarding Ideal Gas Law? Select one: a. b. All of the choices c. is a combination of Boyle’s, Charle’s and Avogadro’s laws d. Expressed as PV=nRT

Which of the following statement is not correct? Select one: a. Empirical formula shows the actual number of atoms in a molecule. b. None of the choices c. Both of the given choi ces are correct d. Molecular formula shows only the relative ratio of each of each atom in a molecule

Assignment 004 The f-subshells of transition metals are incompletely filled. Select one: True False The electron configuration influences the properties of the elements. Select one: True

False Energy levels of orbitals determine the actual arrangement of electrons in atoms. Electrons will fill first the most stable orbitals. Select one: True False Henry Moseley proposed the law of octaves in which he explains that the atomic masses of the elements when arranged in ascending order, elements falling in every eight position were deemed to have the same properties. Select one: True False

The magnetic quantum number describes the size of the orbital. It also indirectly describes the energy of an orbital. Select one: True False Effective nuclear charge is the nuclear charge felt by an electron when both the actual nuclear charge and the repulsive effects of the other electrons are taken into account. Select one: True False Group IA elements have the lowest ionization energies. Select one: True False According to the quantum theory, energy is always expressed in integral multiples. Select one: True False

The energy of a single photon is described as E = hv Select one: True False

Valence electrons are also known as the innermost electrons. Select one: True False

Short Quiz 004 What theory explains that when certain metals are exposed to light of at least a certain minimum frequency, electrons are ejected from its surface. Selec...