Cookin' Chem Unit Test.Part 2
Demonstrate your knowledge of the science behind cookin'
Questions and Answers
- 1.
What are the products of a complete combustion?
- A.
Oxygen & water
- B.
Carbon dioxide & water
- C.
Hydrogen & water
- D.
Carbon & water
Correct Answer
B. Carbon dioxide & waterExplanation
During complete combustion, a fuel reacts with oxygen to produce carbon dioxide and water as the main products. This process occurs when there is an adequate supply of oxygen, allowing the fuel to burn completely. The fuel, which is typically a hydrocarbon compound, combines with oxygen to form carbon dioxide (CO2) and water (H2O). This reaction is commonly used in combustion engines and is essential for the efficient utilization of fuel.Rate this question:
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- 2.
Which molecule would be the MOST fuel efficient?
- A.
C3H8
- B.
C3H7OH
- C.
C5H12
- D.
C8H18
Correct Answer
D. C8H18Explanation
C8H18 would be the most fuel efficient molecule because it has the highest number of carbon atoms and therefore contains more energy per molecule. The longer hydrocarbon chains in C8H18 provide more carbon-carbon bonds, which release more energy when broken during combustion. This makes C8H18 a better fuel option compared to the other molecules with fewer carbon atoms.Rate this question:
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- 3.
What are 2 requirements for a combustion reaction to occur?
- A.
Fuel & oxygen
- B.
Fuel & hydrogens
- C.
Carbon dioxide & oxygen
- D.
Water & oxygen
Correct Answer
A. Fuel & oxygenExplanation
A combustion reaction requires two main components: fuel and oxygen. Fuel provides the necessary energy source, while oxygen acts as the oxidizing agent. In the presence of these two requirements, a combustion reaction can occur, releasing energy in the form of heat and light.Rate this question:
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- 4.
The order of amino acids give a protein its _______ structure.
- A.
Primary
- B.
Secondary
- C.
Tertiary
- D.
Quaternary
Correct Answer
A. PrimaryExplanation
The order of amino acids in a protein determines its primary structure. The primary structure refers to the specific sequence of amino acids that make up the protein chain. This sequence is essential as it determines how the protein will fold into its secondary, tertiary, and quaternary structures, ultimately determining its overall shape and function.Rate this question:
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- 5.
Three ways to denature proteins include:
- A.
Heat, water & salt
- B.
Heat, water & pectin
- C.
Heat, acid & salt
- D.
Heat, salt & pectin
Correct Answer
C. Heat, acid & saltExplanation
Proteins can be denatured through the application of heat, acid, and salt. Heat disrupts the weak bonds and forces the protein to unfold and lose its structure. Acidic conditions alter the pH, causing the protein to lose its shape. Salt disrupts the electrostatic interactions between charged amino acids, leading to protein denaturation. Therefore, the combination of heat, acid, and salt can effectively denature proteins.Rate this question:
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- 6.
When proteins are denature, they ______________.
- A.
Clump up like a glob
- B.
Become cystalline
- C.
Unravel
- D.
Break all bonds
Correct Answer
C. UnravelExplanation
When proteins are denatured, they undergo a structural change that disrupts their normal folding pattern. This causes the protein to unravel and lose its functional shape. Denaturation can occur due to various factors such as heat, pH changes, or exposure to chemicals. The unraveled protein loses its biological activity and may clump up or form aggregates, but the primary change is the unraveling of its structure.Rate this question:
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- 7.
The "R" on an amino acid represents
- A.
Hydrogen
- B.
Rutherodium
- C.
Functional group
- D.
Water
Correct Answer
C. Functional groupExplanation
The "R" on an amino acid represents the functional group. Functional groups are specific groups of atoms that are responsible for the characteristic chemical reactions and properties of organic compounds. In the case of amino acids, the "R" group represents the variable side chain that differentiates one amino acid from another. This side chain can vary in size, shape, and composition, giving each amino acid its unique properties and functions in biological systems. Therefore, the correct answer is functional group.Rate this question:
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- 8.
Fermenations results in
- A.
Oxygen and ethanol
- B.
Hydrogen and ethanol
- C.
Carbon and ethanol
- D.
Carbon dioxide and ethanol
Correct Answer
D. Carbon dioxide and ethanolExplanation
Fermentation is a metabolic process that converts sugar into acids, gases, or alcohol. In this process, yeast or bacteria break down sugar molecules, resulting in the production of carbon dioxide and ethanol. This is a common process in the production of alcoholic beverages and bread making.Rate this question:
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- 9.
Increasing the temperature on fermenation
- A.
Increases the rate of fermenation
- B.
Decreases the rate of fermentation
- C.
Does nothing to the rate of fermentation
- D.
Completely stops fermentation
Correct Answer
A. Increases the rate of fermenationExplanation
Increasing the temperature on fermentation increases the rate of fermentation because higher temperatures provide more energy for the enzyme activity involved in the fermentation process. This results in faster conversion of substrates into products, leading to an overall increase in the rate of fermentation.Rate this question:
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- 10.
Humans need to ingest vitamin C because
- A.
It makes our bones strong
- B.
Improves our eyesight
- C.
Helps our blood to clot (to form a scab)
- D.
We can't synthesize it
Correct Answer
D. We can't synthesize itExplanation
Humans need to ingest vitamin C because our bodies are unable to synthesize it. Unlike many other animals, humans lack the enzyme required to produce vitamin C internally. Therefore, we must obtain it through our diet in order to maintain proper health and function.Rate this question:
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- 11.
Heat is defined as
- A.
The amount of kinetic energy
- B.
The amount of potential energy
- C.
The amount of hotness
- D.
The amount of coldness
Correct Answer
A. The amount of kinetic energyExplanation
Heat is defined as the amount of kinetic energy. This is because heat is the transfer of energy between objects or systems due to a temperature difference. Kinetic energy refers to the energy possessed by an object due to its motion. When objects or particles within a substance move faster, they have higher kinetic energy, resulting in an increase in temperature and the transfer of heat. Therefore, heat can be quantified by measuring the amount of kinetic energy present in a system.Rate this question:
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- 12.
Cooking an egg in a frying pan (egg TOUCHING pan) is an example of
- A.
Conduction
- B.
Convection
- C.
Radiation
- D.
Emulisification
Correct Answer
A. ConductionExplanation
Cooking an egg in a frying pan involves direct contact between the egg and the pan, allowing heat to transfer from the pan to the egg through conduction. Conduction is the process of heat transfer through direct contact between two objects or substances. In this case, the heat from the hot frying pan is conducted to the egg, causing it to cook. This is different from convection, which involves the transfer of heat through the movement of fluids or gases, and radiation, which involves the transfer of heat through electromagnetic waves. Emulsification, on the other hand, refers to the process of mixing two immiscible substances, such as oil and water, to form a stable emulsion.Rate this question:
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- 13.
Boiling noodles in water is an example of
- A.
Conduction
- B.
Convection
- C.
Radiation
- D.
Emulsification
Correct Answer
B. ConvectionExplanation
Boiling noodles in water is an example of convection. Convection is the transfer of heat through the movement of a fluid, such as water, caused by temperature differences. When noodles are boiled in water, the heat from the stove is transferred to the water, causing the water molecules to move and circulate. This circulation of hot water causes the noodles to cook evenly as they are constantly surrounded by hot water. Therefore, the process of boiling noodles in water demonstrates convection as the heat is transferred through the movement of the fluid.Rate this question:
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- 14.
Heat transfers from ________ to ________
- A.
Hot, cold
- B.
Cold, hot
- C.
Air, water
- D.
Water, air
Correct Answer
A. Hot, coldExplanation
Heat transfers from hot to cold because heat energy naturally flows from an object with a higher temperature to an object with a lower temperature. This process is known as heat transfer by conduction, convection, or radiation. The transfer occurs until both objects reach thermal equilibrium, where their temperatures are equal. Therefore, in this case, heat transfers from the hot object to the cold object.Rate this question:
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- 15.
If I stick a metal skewer (stick) into a potato, the amount of cooking time required will
- A.
Decrease
- B.
Stay the same
- C.
Increase
Correct Answer
A. DecreaseExplanation
When a metal skewer is stuck into a potato, it creates a pathway for heat to travel directly into the center of the potato. This allows the heat to be distributed more evenly and efficiently, reducing the cooking time required. Therefore, the amount of cooking time required will decrease.Rate this question:
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- 16.
material Specific heat (cal/goC) Copper 0.09 Iron 0.107 Aluminum 0.17 Glass 0.20 Which of the above materials, given the same mass, would be the HOTTEST after 5 minutes on a burner?
- A.
Copper
- B.
Iron
- C.
Aluminum
- D.
Glass
Correct Answer
A. CopperExplanation
Copper would be the hottest material after 5 minutes on a burner because it has the lowest specific heat. This means that it requires less heat energy to raise its temperature compared to the other materials. Therefore, copper would heat up faster and reach a higher temperature in the same amount of time, making it the hottest material.Rate this question:
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- 17.
material Specific heat (cal/goC) Copper 0.09 Iron 0.107 Aluminum 0.17 Glass 0.20 Which of the above materials, given the same mass, would be the HOTTEST 5 minutes after being removed from a burner?
- A.
Copper
- B.
Iron
- C.
Aluminum
- D.
Glass
Correct Answer
D. GlassExplanation
Glass would be the hottest 5 minutes after being removed from a burner because it has the highest specific heat compared to the other materials listed. Specific heat is a measure of how much heat energy a substance can absorb or release per unit mass. Since glass has a higher specific heat than copper, iron, and aluminum, it can absorb more heat energy from the burner and retain it for a longer period of time, making it the hottest material after being removed from the burner.Rate this question:
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- 18.
What usually stops fermentation is
- A.
Heat
- B.
Water
- C.
Acid
- D.
Alcohol
Correct Answer
D. AlcoholExplanation
Alcohol usually stops fermentation because it is toxic to the yeast or bacteria responsible for the fermentation process. As the alcohol concentration increases, it becomes increasingly difficult for the microorganisms to survive and continue fermenting. This is why alcoholic beverages have a limited alcohol content, as the yeast or bacteria eventually die off once the alcohol reaches a certain level.Rate this question:
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- 19.
Denaturization aids digestion in that
- A.
The protein is can be broken down easier
- B.
The sugar can be broken down easier
- C.
The fat can be broken down easier
- D.
The water can be broken down easier
Correct Answer
A. The protein is can be broken down easierExplanation
Denaturation is a process in which the structure of a protein is altered, causing it to unfold and lose its natural shape. This makes it easier for digestive enzymes to access and break down the protein into smaller peptides and amino acids. Therefore, denaturation aids digestion by making the protein more accessible and easier to break down.Rate this question:
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- 20.
The greatest amount of heat energy would be found in
- A.
Room temperature glass of water
- B.
A warm bath
- C.
8 oz. of coffee
- D.
A pool
Correct Answer
D. A poolExplanation
The greatest amount of heat energy would be found in a pool because it contains a larger volume of water compared to the other options. The larger the volume of water, the more heat energy it can hold. Additionally, a pool is usually exposed to the environment for a longer period of time, allowing it to absorb more heat energy from the surroundings.Rate this question:
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- 21.
Specific heat capacity refers to the
- A.
Heat energy
- B.
Mass
- C.
Amount of energy needed to change 1 g by 1 degree celsius
- D.
Temperature
Correct Answer
C. Amount of energy needed to change 1 g by 1 degree celsiusExplanation
The correct answer is "amount of energy needed to change 1 g by 1 degree celsius". Specific heat capacity is a measure of the amount of energy required to change the temperature of a substance by a certain amount. It is defined as the amount of heat energy needed to raise the temperature of 1 gram of a substance by 1 degree Celsius. This property is important in understanding how different substances absorb and release heat, and it is used in various scientific and engineering calculations.Rate this question:
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- 22.
Object A has a temperature of 34oC. Object B has a temperature of 82oC. When they are placed in contact of each other, heat is transferred PRIMARILY
- A.
From object A to object B
- B.
From object B to object A
- C.
Neither object
- D.
To the observer
Correct Answer
B. From object B to object AExplanation
When two objects with different temperatures are placed in contact with each other, heat is transferred from the object with higher temperature to the object with lower temperature. This is because heat always flows from a region of higher temperature to a region of lower temperature until both objects reach thermal equilibrium. In this case, since object B has a higher temperature than object A, the heat will be transferred primarily from object B to object A.Rate this question:
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- 23.
material Specific heat (cal/goC) Copper 0.09 Iron 0.107 Aluminum 0.17 Glass 0.20 Which of the above materials, given the same mass, and heated to the SAME TEMPERATURE which would be the COLDEST 5 minutes after being removed from the burner?
- A.
Copper
- B.
Iron
- C.
Aluminum
- D.
Glass
Correct Answer
A. CopperExplanation
Copper would be the coldest 5 minutes after being removed from the burner because it has the lowest specific heat compared to the other materials. Specific heat is the amount of heat energy required to raise the temperature of a substance by a certain amount. Since copper has a lower specific heat, it would require less heat energy to raise its temperature, and therefore, it would cool down faster compared to the other materials.Rate this question:
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- 24.
Object A has a temperature of 34oC. Object B has a temperature of 82oC. When placed in contact with one another they will reach a temperature of
- A.
Below 34oC.
- B.
Between 34-82oC
- C.
82oC
- D.
Above 82oC
Correct Answer
B. Between 34-82oCExplanation
When two objects with different temperatures are placed in contact with each other, heat transfer occurs between them until they reach thermal equilibrium. In this case, Object A has a lower temperature of 34oC and Object B has a higher temperature of 82oC. The heat will flow from Object B to Object A, causing Object A's temperature to increase and Object B's temperature to decrease. Eventually, they will both reach a temperature between 34-82oC, as the heat transfer continues until thermal equilibrium is reached. Therefore, the correct answer is between 34-82oC.Rate this question:
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- 25.
What is a product of incomplete combustion?
- A.
Oxygen
- B.
Carbon
- C.
Carbon dioxide
- D.
Carbon monoxide
Correct Answer
D. Carbon monoxideExplanation
Carbon monoxide is a product of incomplete combustion because when there is insufficient oxygen during the combustion process, carbon atoms do not fully combine with oxygen atoms to form carbon dioxide. Instead, they combine with only one oxygen atom, resulting in the formation of carbon monoxide. This incomplete combustion can occur in situations such as malfunctioning gas appliances, poorly ventilated areas, or burning fossil fuels without enough oxygen present. Carbon monoxide is a toxic gas that can be harmful to humans and animals if inhaled in high concentrations.Rate this question:
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Mar 20, 2023Quiz Edited by
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Nov 01, 2011Quiz Created by
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