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Biology Ch 3

Biology Ch 3. Mouse Mischief. The way in which elements bond to form compounds depends on which of the following?. the size of the electrons. the shape of the nucleus. the number of neutrons in each atom. the electrons in the atoms of the elements.

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Biology Ch 3

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  1. Biology Ch 3 Mouse Mischief

  2. The way in which elements bond to form compounds depends on which of the following? the size of the electrons the shape of the nucleus the number of neutrons in each atom the electrons in the atoms of the elements

  3. In what type of bond are electrons shared? ionic nuclear covalent hydrogen

  4. What weak bond holds together the two strands of nucleotides in a DNA molecule? ionic nuclear covalent hydrogen

  5. When an unknown substance is dissolved in water, hydronium ions form. What can you conclude about the substance? The substance is a gas The substance is a bas The substance is an acid The substance is a carbohydrate

  6. Activation energy is needed only by chemical reactions that release energy

  7. In an atom, the number of protons is equal to the number of electrons.

  8. A solution is a mixture of unevenly distributed substances

  9. Polar substances dissolve well in water because water also is polar

  10. Most of the chemical reactions in the body would not occur without enzymes

  11. Atoms do not contain protons. electrons. ions.

  12. The attraction between water molecules is caused by covalent bond hydrogen bonds ionic and covalent bonds

  13. An atom is called an ion when it has either lost or gained electrons lost its nucleus more neutrons than protons

  14. The ability of water to form drops is an example of adhesion. cohesion. ionic bonding

  15. One solution has a pH of 2, and another has a pH of 7. Which of the following is true? Both solutions are acidic The solution with a pH of 2 is basic, and the solution with a pH of 7 is acidic. The solution with a pH of 2 is acidic, and the solution with a pH of 7 is neutral.

  16. Plants store the sun’s energy for future use as DNA starch. protein.

  17. Enzymes are usually proteins. decrease the speed of chemical reactions. increase the activation energy of chemical reactions

  18. The smallest unit of matter that cannot be broken down by chemical means is a(n) element. atom. molecule. electron.

  19. The bonds between the atoms that make up water molecules are called covalent bond hydrogen bonds ionic and covalent bond covalent and hydrogen bonds.

  20. An atom is called an ion when it ha either lost or gained electrons. either lost or gained protons. more neutrons than protons lost its nucleus.

  21. A solution is a mixture of polar and nonpolarsubstances protons and neutrons. unevenly distributed substances. evenly distributed substances.

  22. Water is _______ , therefore _______ substances dissolve in it. polar, nonpolar polar, polar nonpolar, nonpolar nonpolar, polar

  23. In a chemical reaction, energy may be absorbed. released. required. All of the above

  24. Without energy, organisms could not maintain homeostasis. carry out chemical reactions. make their own food. All of the above

  25. The basic units of most biomoleculescontain nitrogen. oxygen carbon. amino acids

  26. Compounds are formed when atoms of an element lose an electron. atoms of an element gain an electron atoms of the same element join together. atoms of two different elements join together.

  27. Enzymes are usually carbohydrates. can only catalyze a reaction onc reduce the activation energy of chemical reactions eliminate the activation energy of chemical reactions.

  28. In an atom with the same number of electrons and protons, the electrical charge is neutral. positive. negative. impossible to determine.

  29. Activation energy is needed by chemical reactions that release energy absorb energy. are catalyzed by enzymes. All of the above

  30. The ability of water to form drops is an example of a chemical change. cohesion. adhesion ionic bonding

  31. What kind of bonds do water molecules form with one another? covalent hydrogen ionic Both (a) and (c)

  32. Starch is made of a sugar, a base, and a phosphate group does not contain carbon atoms. is made of amino acids is a carbohydrate in which energy is stored

  33. Two solutions, A and B, are tested for pH. Solution A indicates a pH of 2. Solution B indicates a pH of 7. You conclude that both solutions are acidic. solution A is basic; solution B is neutral. None of the above solution A is acidic; solution B is neutral

  34. An element is defined as a pure substance because it is made of only one kind of compound. molecule. atom. ion.

  35. Atoms bond with other atoms to form compounds because electrons are attracted to each other bonding helps atoms become more stable. bonding makes an element more pure. the nuclei of atoms are attracted to each other.

  36. When food molecules are broken down inside cells, some of the energy in the molecules is stored temporarily in proteins. RNA. DNA. ATP.

  37. Enzymes that take part in a chemical reaction are not considered to be reactants because they do not take part in the reaction. are not changed by the reaction. have no valence electrons. are used up in the reaction

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