Chemistry Homework

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Need help with chemistry homework. Almost all of them are multiple choice. Please find all questions in the attachment.

Quiz 9 Which of the following does not involve an increase in the random motion of a system? Hot skillet The burning of logs Helium escaping from a balloon The freezing of water The exploding of bombs Which of these does not involve a decrease in the random motion of a system? The burning of logs The refrigeration of water The cooling of hot milk The condensation of water vapor The freezing of methanol In thermodynamics, the substance we are studying is called the _____ and everything else is referred to as the _____. state; surroundings system; surroundings inlet; the outlet system; enthalpy system; the environment The _____ states that energy can neither be created nor destroyed, only transferred between the system and its surroundings-. second law of thermodynamics first law of thermodynamics law of entropy conservation third law of thermodynamics law of heat conservation Which of these statements concerning the first law of thermodynamics isincorrect? A perpetual motion machine cannot exist. Energy is neither created nor destroyed. Energy cannot be converted from one form to another. Chemical energy can be converted to thermal energy. The total energy of the universe is constant. The capacity to do work is known as _____. entropy heat thermodynamics enthalpy energy Which of the following statements about work is incorrect? Any object possessing energy can perform work. Work is dependent on the amount of energy available. Work is a force exerted over some distance. Work is moving atoms in an orderly fashion. All of these statements are correct. Which of the following is not a unit to measure energy? Power Kelvin Joule Calorie Quad The amount of energy required to raise the temperature of 1 gram of water by 1oC is known as _____. watt joule kilojoules calorie quad Which of the following is/are the correct unit(s) for measuring energy? I. II. III. IV. Joule Quad Kilowatt-hour Ampere I, II, and III I only II, III, and IV II and IV I, III, and IV If the normal body temperature is 98.6°F, what is the corresponding temperature in °C? 177°C 119°C 23.0°C 37.0°C 372°C The amount of heat necessary to raise the temperature of a given amount of a substance by 1°C is known as _____. work entropy heat capacity heat energy Which of these statements about exothermic reactions is incorrect? Exothermic reactions have a negative change in enthalpy. A chemical cold pack is an example of an exothermic reaction. Most combustion reactions are exothermic reactions. All fuels exhibit exothermic properties. Exothermic reactions release energy to the surroundings. A reaction that absorbs heat from the surroundings is known as a(n) _____. exothermic and combustion reaction endothermic and combustion reaction exothermic reaction endothermic reaction combustion reaction Which of the following is true of photosynthesis? It does not involve a change in energy. It releases energy and is therefore exothermic. It releases energy and is therefore endothermic. It requires energy and is therefore endothermic. It requires energy and is therefore exothermic. Which of the following statements about fossil fuels is incorrect? The energy of fossil fuels is released by combustion reactions. The energy within fossil fuels was formed as a result of exothermic reactions in prehistoric plants. Fossil fuels are primarily hydrocarbons. Fossil fuels are highly energetic. The energy within fossil fuels ultimately came from photosynthesis. Which of the following is one of the two largest sources of electrical power in the United States? Hydropower Natural gas Nuclear power Petroleum Coal Which of the following does not add carbon dioxide to the atmosphere? Forest fires Breathing Production of iron and steel Photosynthesis Driving cars Which of the following compounds is capable of binding to hemoglobin in place of oxygen, affecting the heart and respiratory system NO H2O NO2 CO2 CO Which of the following compounds can combine with the moisture in the air, resulting in the formation of acid rain? CO2 PAN O3 NO2 CO Which of the following is a cause of global warming? Greenhouse effect Acid rain Heat capacity Fission Catalytic conversion Which of the following processes involve(s) a net decrease of entropy? I. II. III. IV. The condensation of steam The freezing of methanol The evaporation of ethanol The boiling of water I, II, III, and IV II and III I, II, and IV I and II III only Which of these units of energy is typically used for nutritional measurements? Kilojoules Calorie Quad Joule Watt How many joules of energy does a candy bar with 250 Calories contain? 59.8 J 5.98 × 104 J 1.05 × 106 J 1.05 J 1046 J Quiz 10 Which of the following is not a problem associated with utilizing solar energy? Low concentration of solar energy supply Low efficiency of solar cells for collecting solar energy High costs associated with constructing solar technologies Hazardous wastes associated with solar cell decomposition Nonrenewable nature of solar energy Which of the following is a cleaner alternative fuel source to fossil fuels? Solar energy Wind power Hydroelectric power Geothermal energy All of these Which of the following forms of alternative power source does not get its energy from the Sun either directly or indirectly? Geothermal energy Hydroelectric power Wind power Biomass energy Solar energy Which of the following is the world’s most utilized alternative energy source? Geothermal energy Hydroelectric power Wind energy Biomass energy Nuclear energy Which of the following is not a disadvantage of hydroelectric power? Threat to marine life Threat of dam failure Disruption of nutrient flow downstream Relatively small number of dammable rivers Cost of producing hydroelectric power Which of the following statements associated with wind power isincorrect? Wind power is an indirect form of solar power. Wind power accounts for 5% of the total electricity of the United States. Wind power is currently too expensive. Wind power production is uncontrollable and intermittent. All of these statements are correc Which of the following are disadvantages of wind power? I. II. Wind farms use large portions of land, which cannot be used for other purposes. Wind farms are undependable since winds are not always present when needed. Wind power generation is extremely expensive and hence not cost competitive with other fuels. Wind power is nonrenewable; once it is used up, it cannot be replenished. III. IV. I and IV II and IV I and III I and II I, II, and III Which of the following is an environmental problem associated with hydroelectric power? Flooding of upstream canyons Reduced nutrient flow downstream Interrupted spawning patterns of fish Destruction of naturally majestic wilderness All of these Which of the following is/are currently the most cost competitive in creating fuel to replace fossil fuels? I. II. III. Solar power tower Parabolic trough Dish/engine I only II only I, II, and III I and II I and III Which of the following alternative energy sources is considered renewable? Biomass energy Solar energy Hydroelectric power Wind energy All of these Which of the following is the most common type of semiconductor found in photovoltaic cells? Arsenic Carbon Uranium Silicon Hydrogen Which of the following is the correct notation for an electron-rich semiconductor when silicon is doped with arsenic? p-type p/n-type n-type n/p-type None of these Which of the following is the correct notation for an electron-deficient semiconductor? p/n-type p-type n-type n/p-type None of these Photovoltaic systems convert solar energy into _____. heat electricity electrons solar thermal power steam Photovoltaic cells convert light into electricity without _____. moving parts noise pollution moving parts and noise moving parts, noise, and pollution Apart from low concentrations, which of the following is the most significant problem associated with solar energy? Low levels of processing Intermittence of sunlight Inefficient storage High cost of collecting Lack of sufficient collecting systems Which of the following processes is representative of the given equation? Energy + 2H2O → 2H2 + O2 Photosynthesis Electrolysis Hydrolysis Respiration Combustion Which of the following processes is representative of the given equation? Sunlight + 6CO2 + 6H2O → C6H12O6 + 6O2 Photosynthesis Electrolysis Hydrolysis Respiration Combustion Which of the following is not a fuel for vehicles? Hydrogen Ethanol Solar power A fuel cell None of these Which of the following two methods are used for obtaining energy from plants? Extraction of liquid fuels and photochemistry Burning and extraction of H2O for fuel cells Burning and extraction of solar energy Burning and extraction of liquid fuels Photochemistry and burning Which of the following is the most significant problem associated with biomass energy? Inefficient form of energy Global warming Insufficient land Expensive to produce Hazardous wastes Which of the following is the most significant problem associated with geothermal energy? Inefficient form of energy Global warming Limited availability Expensive to produce None of these In the year 2050, about half of the power produced in nuclear fusion reactors would be used for electricity production and the other half would be used for creating _____. ethanol fuel biofuel fossil fuel hydrogen fuel methanol fuel Which of the following is not a problem associated with geothermal energy? It has limited availability. Vented steam usually contains sulfurous and ammonia gases. Global warming occurs because of the high levels of CO2 produced. Condensed steam from Earth's crust is corrosive to mechanical parts. All of these are problems associated with geothermal energy. Identify the disadvantage/disadvantages of using nuclear power as an alternative energy source. I. II. III. Limited amounts of U-235 Radioactive wastes Smog production II only II and III I and III I and II I, II, and III Homework 10 Please find a short article from the popular press on renewable energy and submit it as a pdf file separately. Homework 11 a.A sample of gas has a volume of 567 mL at a pressure of 3.90 atm. The gas is allowed to expand and now has a pressure of 1.16 atm. Predict whether the new volume is greater or less than the initial volume, and calculate the new volume. Assume temperature is constant and no gas escaped from the container. New volume larger or smaller? New volume = mL b.A sample of gas has a volume of 3.11 L at a temperature of 42.20 °C. The gas sample is cooled to a temperature of 14.40 °C (assume pressure and amount of gas are held constant). Predict whether the new volume is greater or less than the original volume, and calculate the new volume. New volume larger or smaller? New volume = L Quiz 11 The unit of pressure is _____. kN/m2 N/mm2 kN/mm2 N/m2 N/m3 The layer of air that surrounds the earth is known as the _____. crust pressure atmosphere gas constant biosphere Which of these laws describes the relationship between pressure and volume at a constant temperature? Ideal gas law Boyle's law Charles's law Avogadro's law Graham's law According to Boyle's law, if the pressure of a gas is increased by a factor of 4, then the _____ of the gas is _____ by a factor of _____. volume; increased; 4 volume; decreased; 4 volume; increased; 14 temperature; increased; 4 temperature; decreased; 4 A gas cylinder with a movable piston has a pressure of 100 torr and a volume of 1.0 L. Determine the pressure of the gas if it is compressed to a volume of 0.75 L at constant temperature. 25 torr 55 torr 75 torr 133.33 torr 150 torr Which of these is the correct representation of Charles's law? PV = k V/T = k P/V = k V/P = k VT = k The temperature scale used in problems involving gas law equation must be expressed in _____. celsius kelvin fahrenheit rankine newton According to Charles's law, if the volume of a gas is decreased by a factor of 3, then the _____ of the gas is _____ by a factor of _____. volume; increased; 3 volume; decreased; 1/3rd volume; increased; 9 temperature; increased; 3 temperature; decreased; 3 The noble gas argon accounts for approximately _____ of the earth's atmosphere. 10% 0.9% 0.1% 0.01% 0.001% Which of these gases is the most abundant in the earth's atmosphere? O2 N2 H2 He CO2 _____ is broken down by bacteria in the soil to its compounds, and these compounds are used directly by plants. N2 O2 Ar He CO2 Which of these is responsible for the rusting of metal and the dulling of paint? N2 O2 Ar He CO2 Which of these processes is represented by the given equation? C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + energy Nitrogen fixation Combustion Photosynthesis Respiration Ozone depletion Which of these processes is represented by the given equation? 6 H2O + 6 CO2 + energy → C6H12O6 + 6 O2 Nitrogen fixation Combustion Photosynthesis Respiration Ozone depletion Which region of the atmosphere is credited with the phenomenon known as aurora borealis or the northern lights? Thermosphere Mesosphere Stratosphere Troposphere Ionosphere Which of these acts as a pollutant in the troposphere but as a UV shield in the stratosphere? CO PM-2.5 SO2 O3 Pb Which of these pollutants gives smog its characteristic brown color? CO NO2 SO2 O3 Pb Which of these pollutants can damage the kidneys, liver, and nervous system? CO NO2 SO2 O3 Pb Which of the following statements is true of UV-A and UV-B? UV-A is more harmful to humans than UV-B. UV-B is more harmful to humans than UV-A. UV-A and UV-B are equally harmful to humans. Neither UV-A or UV-B is harmful to humans. UV-A is shorter in wavelength than UV-B. Which of these compounds is credited with the accelerated depletion of the ozone layer? CO CFCs O2 NO SO2 Chlorofluorocarbons are not used in _____. aerosol propellants refrigeration systems industrial solvents fast-food containers steel utensils Which of these regions has the most significant ozone depletion? North America Eastern Europe Antarctica Middle East Southern Afric Which of these compounds has replaced chlorofluorocarbons (CFCs) that were used in some industries? HCFCs Freon-12 CO2 N2 Silicon What causes pressure? A sudden decrease in temperature The collisions of gas molecules with other gas molecules Collisions of gas molecules with their surrounding surfaces All of these None of these

Tutor Answer

uoscar
School: University of Virginia

The solution is attached.The other pd file is a news article on renewable energy as demanded in the assignment.

Quiz 9
Which of the following does not involve an increase in the random motion of a system?
Hot skillet
The burning of logs
Helium escaping from a balloon
The freezing of water
The exploding of bombs
Which of these does not involve a decrease in the random motion of a system?
The burning of logs
The refrigeration of water
The cooling of hot milk
The condensation of water vapor
The freezing of methanol
In thermodynamics, the substance we are studying is called the _____ and everything else is referred to as
the _____.
state; surroundings
system; surroundings
inlet; the outlet
system; enthalpy
system; the environment
The _____ states that energy can neither be created nor destroyed, only transferred between the system
and its surroundings-.
second law of thermodynamics
first law of thermodynamics
law of entropy conservation
third law of thermodynamics
law of heat conservation
Which of these statements concerning the first law of thermodynamics isincorrect?
A perpetual motion machine cannot exist.
Energy is neither created nor destroyed.

Energy cannot be converted from one form to another.
Chemical energy can be converted to thermal energy.
The total energy of the universe is constant.
The capacity to do work is known as _____.
entropy
heat
thermodynamics
enthalpy
energy
Which of the following statements about work is incorrect?
Any object possessing energy can perform work.
Work is dependent on the amount of energy available.
Work is a force exerted over some distance.
Work is moving atoms in an orderly fashion.
All of these statements are correct.
Which of the following is not a unit to measure energy?
Power
Kelvin
Joule
Calorie
Quad
The amount of energy required to raise the temperature of 1 gram of water by 1oC is known as _____.
watt
joule
kilojoules
calorie
quad
Which of the following is/are the correct unit(s) for measuring energy?
I.
II.
III.

Joule
Quad
Kilowatt-hour

IV.

Ampere
I, II, and III
I only
II, III, and IV
II and IV
I, III, and IV

If the normal body temperature is 98.6°F, what is the corresponding temperature in °C?
177°C
119°C
23.0°C
37.0°C
372°C
The amount of heat necessary to raise the temperature of a given amount of a substance by 1°C is known
as _____.
work
entropy
heat capacity
heat
energy
Which of these statements about exothermic reactions is incorrect?
Exothermic reactions have a negative change in enthalpy.
A chemical cold pack is an example of an exothermic reaction.
Most combustion reactions are exothermic reactions.
All fuels exhibit exothermic properties.
Exothermic reactions release energy to the surroundings.
A reaction that absorbs heat from the surroundings is known as a(n) _____.
exothermic and combustion reaction
endothermic and combustion reaction
exothermic reaction
endothermic reaction

combustion reaction
Which of the following is true of photosynthesis?
It does not involve a change in energy.
It releases energy and is therefore exothermic.
It releases energy and is therefore endothermic.
It requires energy and is therefore endothermic.
It requires energy and is therefore exothermic.
Which of the following statements about fossil fuels is incorrect?
The energy of fossil fuels is released by combustion reactions.
The energy within fossil fuels was formed as a result of
exothermic reactions in prehistoric plants.
Fossil fuels are primarily hydrocarbons.
Fossil fuels are highly energetic.
The energy within fossil fuels ultimately came from
photosynthesis.
Which of the following is one of the two largest sources of electrical power in the United States?
Hydropower
Natural gas
Nuclear power
Petroleum
Coal
Which of the following does not add carbon dioxide to the atmosphere?
Forest fires
Breathing
Production of iron and steel
Photosynthesis
Driving cars
Which of the following compounds is capable of binding to hemoglobin in place of oxygen, affecting the
heart and respiratory system
NO
H2O

NO2
CO2
CO
Which of the following compounds can combine with the moisture in the air, resulting in the formation of
acid rain?
CO2
PAN
O3
NO2
CO
Which of the following is a cause of global warming?
Greenhouse effect
Acid rain
Heat capacity
Fission
Catalytic conversion
Which of the following processes involve(s) a net decrease of entropy?
I...

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Anonymous
Goes above and beyond expectations !

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