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Questions and Answers

What is the primary role of chemical reactions in the body?

  • To provide energy for physical activities
  • To facilitate metabolic processes that sustain life (correct)
  • To build structural components of cells
  • To regulate temperature and maintain homeostasis

    • Which of the following is true about fat consumption in developed countries?

  • A high fat intake is necessary for good health
  • People generally consume less fat than recommended
  • The type of fat consumed does not affect health
  • Obesity and overweight are linked to excessive fat consumption (correct)

    • What characteristic of trans fats increases health risks?

  • They are naturally occurring fats
  • They have a certain arrangement of hydrogen atoms (correct)
  • They contribute to quick energy release
  • They help in the absorption of vitamins

    • What does the atomic number of an element represent?

    <p>Number of protons in the atomic nucleus</p> Signup and view all the answers

    Which particle is negatively charged and orbits around the atomic nucleus?

    <p>Electron</p> Signup and view all the answers

    Which statement accurately describes an element?

    <p>It contains atoms with the same number of protons</p> Signup and view all the answers

    What happens to charges that are alike?

    <p>They repel each other</p> Signup and view all the answers

    What role do hydrogenated vegetable oils play in health risks?

    <p>They can raise the risk of several serious conditions</p> Signup and view all the answers

    What distinguishes hydrogen bonds from ionic bonds?

    <p>Hydrogen bonds do not create molecules from atoms.</p> Signup and view all the answers

    What is the main reason ice floats on water?

    <p>Ice has lower density than water.</p> Signup and view all the answers

    In which direction does water move during osmosis?

    <p>From low solute concentration to high solute concentration.</p> Signup and view all the answers

    What does an isotonic solution represent?

    <p>Equal solute concentration inside and outside the cell.</p> Signup and view all the answers

    Which statement about acids is correct?

    <p>Acids release hydrogen ions in water.</p> Signup and view all the answers

    What is the characteristic of a buffer solution?

    <p>It resists changes in pH when acids or bases are added.</p> Signup and view all the answers

    What does a pH value of 7 indicate?

    <p>The solution is neutral.</p> Signup and view all the answers

    Which term describes a solution with more solute concentration outside a cell?

    <p>Hypertonic</p> Signup and view all the answers

    What is the most stable state of an atom regarding its outermost shell?

    <p>Being completely filled with electrons</p> Signup and view all the answers

    What type of bond is characterized by the transfer of electrons from one atom to another?

    <p>Ionic bond</p> Signup and view all the answers

    What occurs to a molecule formed by ionic bonding when it is dissolved in water?

    <p>It breaks up into positive and negative ions</p> Signup and view all the answers

    Which type of bond involves unequal sharing of electrons?

    <p>Polar covalent bond</p> Signup and view all the answers

    What is electronegativity in a chemical bond context?

    <p>The attraction of an atom for shared electrons</p> Signup and view all the answers

    Which of the following best describes a hydrogen bond?

    <p>A weak attraction between a hydrogen atom and another atom</p> Signup and view all the answers

    An atom that has donated an electron becomes what type of ion?

    <p>Cation</p> Signup and view all the answers

    In which type of covalent bond do atoms share electrons equally?

    <p>Nonpolar covalent bond</p> Signup and view all the answers

    What describes isotopes?

    <p>They differ in the number of neutrons.</p> Signup and view all the answers

    Which statement is true about ions?

    <p>The number of protons remains the same during a chemical reaction.</p> Signup and view all the answers

    What is a molecule?

    <p>An aggregate of at least two atoms in a fixed ratio.</p> Signup and view all the answers

    What distinguishes an element from a compound?

    <p>Elements cannot be broken down by chemical reactions.</p> Signup and view all the answers

    Which of the following correctly describes a radioisotope?

    <p>An isotope with an unstable nucleus.</p> Signup and view all the answers

    What is the mass number of an atom?

    <p>The sum of protons and neutrons.</p> Signup and view all the answers

    Which of the following is true regarding neutrons?

    <p>Neutrons are uncharged subatomic particles in the nucleus.</p> Signup and view all the answers

    Which best represents a compound?

    <p>NaCl</p> Signup and view all the answers

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