Cookin' Chem Unit Test.Part 2

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  • 1/25 Questions

    The order of amino acids give a protein its _______ structure.

    • Primary
    • Secondary
    • Tertiary
    • Quaternary
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Biochemistry Quizzes & Trivia
About This Quiz

The 'Cookin' Chem Unit Test. Part 2' assesses knowledge on chemical and biochemical principles, focusing on combustion reactions, fuel efficiency, protein structure, and denaturation processes. It is designed for learners to understand and apply core concepts in real-world contexts.

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  • 2. 

    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

    • Below 34oC.

    • Between 34-82oC

    • 82oC

    • Above 82oC

    Correct Answer
    A. Between 34-82oC
    Explanation
    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.

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  • 3. 

    Three ways to denature proteins include:

    • Heat, water & salt

    • Heat, water & pectin

    • Heat, acid & salt

    • Heat, salt & pectin

    Correct Answer
    A. Heat, acid & salt
    Explanation
    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.

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  • 4. 

    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

    • From object A to object B

    • From object B to object A

    • Neither object

    • To the observer

    Correct Answer
    A. From object B to object A
    Explanation
    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.

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  • 5. 

    Increasing the temperature on fermenation

    • Increases the rate of fermenation

    • Decreases the rate of fermentation

    • Does nothing to the rate of fermentation

    • Completely stops fermentation

    Correct Answer
    A. Increases the rate of fermenation
    Explanation
    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.

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  • 6. 

    What are  2 requirements for a combustion reaction to occur?

    • Fuel & oxygen

    • Fuel & hydrogens

    • Carbon dioxide & oxygen

    • Water & oxygen

    Correct Answer
    A. Fuel & oxygen
    Explanation
    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.

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  • 7. 

    Denaturization aids digestion in that

    • The protein is can be broken down easier

    • The sugar can be broken down easier

    • The fat can be broken down easier

    • The water can be broken down easier

    Correct Answer
    A. The protein is can be broken down easier
    Explanation
    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.

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  • 8. 

    Specific heat capacity refers to the

    • Heat energy

    • Mass

    • Amount of energy needed to change 1 g by 1 degree celsius

    • Temperature

    Correct Answer
    A. Amount of energy needed to change 1 g by 1 degree celsius
    Explanation
    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.

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  • 9. 

    Heat is defined as

    • The amount of kinetic energy

    • The amount of potential energy

    • The amount of hotness

    • The amount of coldness

    Correct Answer
    A. The amount of kinetic energy
    Explanation
    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.

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  • 10. 

    Fermenations results in

    • Oxygen and ethanol

    • Hydrogen and ethanol

    • Carbon and ethanol

    • Carbon dioxide and ethanol

    Correct Answer
    A. Carbon dioxide and ethanol
    Explanation
    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.

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  • 11. 

    What are the products of a complete combustion?

    • Oxygen & water

    • Carbon dioxide & water

    • Hydrogen & water

    • Carbon & water

    Correct Answer
    A. Carbon dioxide & water
    Explanation
    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.

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  • 12. 

    When proteins are denature, they ______________.

    • Clump up like a glob

    • Become cystalline

    • Unravel

    • Break all bonds

    Correct Answer
    A. Unravel
    Explanation
    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.

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  • 13. 

    Boiling noodles in water is an example of

    • Conduction

    • Convection

    • Radiation

    • Emulsification

    Correct Answer
    A. Convection
    Explanation
    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.

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  • 14. 

    Heat transfers from ________ to ________

    • Hot, cold

    • Cold, hot

    • Air, water

    • Water, air

    Correct Answer
    A. Hot, cold
    Explanation
    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.

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  • 15. 

    Cooking an egg in a frying pan (egg TOUCHING pan) is an example of

    • Conduction

    • Convection

    • Radiation

    • Emulisification

    Correct Answer
    A. Conduction
    Explanation
    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.

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  • 16. 

    If I stick a metal skewer (stick) into a potato, the amount of cooking time required  will

    • Decrease

    • Stay the same

    • Increase

    Correct Answer
    A. Decrease
    Explanation
    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.

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  • 17. 

    What usually stops fermentation is

    • Heat

    • Water

    • Acid

    • Alcohol

    Correct Answer
    A. Alcohol
    Explanation
    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.

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  • 18. 

    Humans need to ingest vitamin C because

    • It makes our bones strong

    • Improves our eyesight

    • Helps our blood to clot (to form a scab)

    • We can't synthesize it

    Correct Answer
    A. We can't synthesize it
    Explanation
    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.

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  • 19. 

    The "R" on an amino acid represents

    • Hydrogen

    • Rutherodium

    • Functional group

    • Water

    Correct Answer
    A. Functional group
    Explanation
    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.

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  • 20. 

    The greatest amount of heat energy would be found in

    • Room temperature glass of water

    • A warm bath

    • 8 oz. of coffee

    • A pool

    Correct Answer
    A. A pool
    Explanation
    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.

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  • 21. 

    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?

    • Copper

    • Iron

    • Aluminum

    • Glass

    Correct Answer
    A. Copper
    Explanation
    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.

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  • 22. 

    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?

    • Copper

    • Iron

    • Aluminum

    • Glass

    Correct Answer
    A. Copper
    Explanation
    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.

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  • 23. 

    Which molecule would be the MOST fuel efficient?

    • C3H8

    • C3H7OH

    • C5H12

    • C8H18

    Correct Answer
    A. C8H18
    Explanation
    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.

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  • 24. 

    What is a product of incomplete combustion?

    • Oxygen

    • Carbon

    • Carbon dioxide

    • Carbon monoxide

    Correct Answer
    A. Carbon monoxide
    Explanation
    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.

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  • 25. 

    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?

    • Copper

    • Iron

    • Aluminum

    • Glass

    Correct Answer
    A. Glass
    Explanation
    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.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 01, 2011
    Quiz Created by
    Lmmurp2

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