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Chemistry of Lif
The Chemistry of Life - CSCC
| Question | Answer |
|---|---|
| The mass number of an atom is equal to the number of | protons & neutrons |
| Atoms with the same number of protons and a different number of neutrons are | isotopes |
| An atom with 6 protons, 7 neutrons, and 6 electrons has an atomic number of | 6 |
| The chemical behavior of atoms is determined by the | electrons |
| Polar molecules are hydrophilic. A) True B) False | A) True |
| A substance with a pH of 10 will have more hydrogen ions than hydroxide ions. A) True B) False | B) False |
| An atom with 4 electrons in its outer shell could accept up to 4 more electrons. A) True B) False | A) True |
| A crystal of table salt is held together by hydrogen bonds. A) True B) False | B) False |
| Non-polar substances don't get wet in water. A) True B) False | A) True |
| Which of the following has the least amount of mass? A) a proton B) a neutron C) an electron D) an atom E) a molecule | an electron |
| An atom with an incompletely filled outermost energy level is likely to be | reactive |
| An atom with eight electrons and six protons is an example of a(n) | ion |
| Ionic bonding involves | the attraction of oppositely charged atoms |
| Isotopes of carbon all have the same chemical properties. A) True B) False | A) True |
| _______________ bonds link most of the atoms in the human body. | Covalent |
| One pair of electrons shared between two atoms is called a[an] | single covalent bond |
| Hydrogen bonds are too weak to form stable molecules therefore they are not important in biological molecules. A) True B) False | B) False |
| Ice is less dense that liquid water. A) True B) False | A) True |
| _____________ allows water molecules to stick together and form droplets. | Cohesion |
| A substance that combines with H+ when dissolved in water is called an acid. A) True B) False | B) False |
| The smallest particle into which a substance can be divided and still retain all of its chemical properties is | an atom |
| An atom that has gained or lost one or more electrons is | an ion |
| Atoms are held together by a force called a bond. The three types of bonds are | ionic, covalent, and hydrogen |
| Carbon has four electrons in its outer electron shell, therefore | it can form four single covalent bonds |
| The partial separation of charge in the water molecule | A) results from the electrons' greater attraction to the oxygen atom. B) results from oxygen's higher electronegativity. C) indicates that the water molecule is a polar molecule. D) All of these are correct. |
| Water has some very unusual properties. These properties occur because | of the hydrogen bonds between the individual water molecules |
| The attraction of water molecules to other water molecules is called | cohesion |
| Water sometimes ionizes, a single molecule breaking apart into a hydrogen ion and a hydroxide ion. Other materials may dissociate in water, resulting in an increase of either (1) hydrogen ions or (2) hydroxide ions in the solution. We call the results | (1) acids and (2) bases |
| A buffer acts in all but which of the following ways? | to keep pH from ever changing |
| What properties are somehow related to the need for significant thermal energy to break hydrogen bonds? A) cohesion and adhesion B) hydrophobic and hydrophilic C) heat storage and heat of vaporization D) ice formation and high polarity | C) heat storage and heat of vaporization |
Created by:
Bonnie870
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