mass and mole concepts and formulas
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Questions and Answers

What is the first step to compute the number of molecules in a given mass of compound?

  • Multiply by molar mass (correct)
  • Multiply by Avogadro's number
  • Divide by Avogadro's number
  • Divide by molar mass

    • How many C atoms are contained in 1.31 × 10^20 molecules of C7H5NO3S?

  • 1.31 × 10^21 C atoms
  • 7.77 × 10^19 C atoms
  • 9.17 × 10^20 C atoms (correct)
  • 1.31 × 10^19 C atoms

    • What is the weight and volume of a typical human brain approximately?

  • Weight: 2.0 kg, Volume: 0.5 L
  • Weight: 1.5 kg, Volume: 1.1 L (correct)
  • Weight: 1.1 kg, Volume: 1.5 L
  • Weight: 0.5 kg, Volume: 2.0 L

    • Which type of cells transmit information between different parts of the central nervous system?

    <p>Neurons (B)</p> Signup and view all the answers

    What happens during the process of exocytosis in neurons?

    <p>Release of neurotransmitter molecules (A)</p> Signup and view all the answers

    Which neurotransmitter, involved in various neurological processes, has been extensively studied?

    <p>Dopamine (C8H11NO2) (B)</p> Signup and view all the answers

    What is the role of dopamine in the brain?

    <p>Impacts human behavior and neurological processes (A)</p> Signup and view all the answers

    How do neurotransmitter molecules travel between neurons for signaling?

    <p>By diffusing across the synapse (D)</p> Signup and view all the answers

    What is the aim of the BRAIN Initiative announced in 2013?

    <p>To accelerate and capitalize on advances in brain research (A)</p> Signup and view all the answers

    What type of signals are used by neurons to transmit information?

    <p>Both electrical and chemical signals (C)</p> Signup and view all the answers

    What is the first step required to compute the number of molecules in a given mass of a compound?

    <p>Derive the number of moles (A)</p> Signup and view all the answers

    In the context of the text, what is the role of Avogadro’s number in computing the number of molecules?

    <p>To convert between moles and molecules (B)</p> Signup and view all the answers

    What does the abbreviation BRAIN stand for in 'the BRAIN Initiative' mentioned in the text?

    <p>Brain Research through Advancing Innovative Neurotechnologies (C)</p> Signup and view all the answers

    What happens during exocytosis in neurons?

    <p>Neurotransmitter molecules are released from vesicles into the synapse (B)</p> Signup and view all the answers

    Why are neurotransmitter molecules stored in vesicles inside neurons?

    <p>To protect them from degradation (B)</p> Signup and view all the answers

    Which element is essential in the neurotransmitter dopamine, C8H11NO2, that impacts human behaviors?

    <p>Hydrogen (B)</p> Signup and view all the answers

    What is the primary function of dopamine in various neurological processes?

    <p>Controls mood and behavior (C)</p> Signup and view all the answers

    How do neurons transmit information between different parts of the central nervous system?

    <p>By releasing neurotransmitters into synapses (A)</p> Signup and view all the answers

    What is the function of neurons in the central nervous system?

    <p>To transmit information using electrical signals (A)</p> Signup and view all the answers

    Why is it essential to determine the number of moles before calculating the number of molecules in a compound?

    <p>To establish a relationship with Avogadro’s number (D)</p> Signup and view all the answers

    What is the number of hydrogen atoms in 1.31 × 10^20 molecules of C7H5NO3S?

    <p>5.53 × 10^21 atoms H (B)</p> Signup and view all the answers

    In the context of the text, what is the weight of a typical human brain approximately?

    <p>1.5 kg (C)</p> Signup and view all the answers

    How does chemical signaling occur between different neurons in the brain?

    <p>By diffusion of neurotransmitter molecules at synapses (A)</p> Signup and view all the answers

    What is the primary role of neurons in the central nervous system?

    <p>To transmit information through electrical and chemical signals (B)</p> Signup and view all the answers

    Why are neurotransmitter molecules stored in vesicles inside neurons?

    <p>To enhance their signaling capacity (A)</p> Signup and view all the answers

    What is the function of dopamine in various neurological processes?

    <p>Impact on a wide variety of human behaviors (D)</p> Signup and view all the answers

    Why is the BRAIN Initiative aiming to accelerate brain research?

    <p>To capitalize on advances made in brain research (D)</p> Signup and view all the answers

    What is the purpose of Avogadro’s number in computing the number of molecules?

    <p>To determine the number of molecules in a mole (A)</p> Signup and view all the answers

    How do neurons transmit information between different parts of the central nervous system?

    <p>Through electrical and chemical signals (D)</p> Signup and view all the answers

    Which neurotransmitter has been mentioned in the text as involved in various neurological processes?

    <p>Dopamine (A)</p> Signup and view all the answers

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