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Quizchapter1-3
| Question | Answer |
|---|---|
| All the organisms on your campus make up | an ecosystem |
| Which of the following is a correct sequence of levels in life's hierarchy, proceeding downward from an individual animal? | nervous system, brain, nervous tissue, nerve cell |
| Which of the following is NOT an observation or inference on which Darwin's theory of natural selection is based? | Poorly adapted individuals never produce offspring. |
| Systems biology is mainly an attempt to | Analyze genomes from different species |
| Protists and bacteria are grouped into different domains because | bacteria decompose protists |
| Which of the following best demonstrates the unity among all organisms? | descent with modification |
| A controlled experiment is one the | is repeated many times to make sure the results are accurate |
| Which of the following statements best distinguishes hypotheses from theories in science? | Hypotheses usually are relatively narrow in scope; theories have broad explanatory power. |
| Which of the following is an example of qualitative data? | The fish swam in a zigzag motion |
| Which of the following best describes the logic of scientific inquiry? | If my hypothesis is correct, I can expect certain test results. |
| In the term trace element, the adjective trace means that | the element is required in very small amounts. |
| Compared with 31P, the radioactive isotope 32P has | one more neutron |
| The reactivity of an atom arises from | the existence of unpaired electrons in the valence shell. |
| Which statement is true of all atoms that are anions? | The atom has more electrons than protons. |
| Which of the following statements correctly describes any chemical reaction that has reached equilibrium? | The rates of the forward and reverse reactions are equal. |
| We can represent atoms by listing the number of protons, neutrons, and electrons- for example, 2p+,2n°,2e- for helium. Which of the following represents the 18O isotope of oxygen? | 6p+, 8n°, 6e- |
| The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound. | H2S |
| What coefficients must be placed in following blanks so that all atoms are accounted for in the products? C6H12O6-->___C2H6O+____CO2 | 2;2 |
| Many mammals control their body temperature by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temperature? | The absorption of heat by the breaking of hydrogen bonds |
| The bonds that are broken when water vaporizes are | hydrogen bonds between water molecules |
| Which of the following is a hydrophobic material? | wax |
| We can be sure that a mole of table sugar and a mole of vitamin C are equal in their | Number of molecules |
| Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake? | 10-4 M |
| What is the hydroxide ion concentration of the lake described in [Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake?] | 10-10 M |
| A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.) | 10°C |
| How many grams of acetic acid (C2H4O2) would you use to make 10 L of a 0.1 M aqueous solution of acetic acid? (Note: The atomic masses, in daltons, are approximately 12 for carbon, 1 for hydrogen, and 16 for oxygen.) | 60 g |
| Cohesion | when water molecules attach to one another using hydrogen bonds. This allows them to build on top of each other (e.g Surface tension) |
| Adhesion | Due to hydrogen bonds, water molecules are able to stick to other surfaces (e.g straw in water) |
| The combination of cohesion and adhesion allows the water molecules to travel _ a straw or tree | Up (e.g, drinking from a straw) |
| High Specific Heat | due to the weak and variable nature of hydrogen bond, it is difficult to transfer energy through water. (E.g, pan gets hot before the water because water takes longer to transmit energy) |
| Why does hydrogen bond make water a great solvent? | They rip apart the other molecules in the substances (E.g, water poured into a cup with some milk will rip apart the molecules in the milk) |
| Surface Tension | The water molecule connect to one another and essentially become one large molecule (THIS is how small insects graze the water without falling down) |
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samosa
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