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Theresa biology
10th grade biology
| Question | Answer |
|---|---|
| What is an observation? | Anything that can be stated using your senses |
| What are the 2 types of observations? | Qualitative and quantitative |
| What is inference? | An explanation for an observation you have made |
| What is the basis for inference? | Past events or prior knowledge Can change when new observations are made |
| Example: the schools lawn is wet | Inference: it rained last night |
| I or O? When I rang the doorbell, no one answered | O |
| I or O? Those clouds look like it's going to rain | I |
| What is the scientific method? | An organized plan for gathering, organizing, and communicating information |
| What is the goal of the scientific method | To solve a problem or better understand an observed event |
| How do you make an observation? | Gather information through your 5 senses |
| What are repeatable observations? | Known facts |
| What is the 1st step in making an observation? | Combine your observations to form a question |
| What is the 2nd step in making an observation? | Form a hypothesis |
| What is a hypothesis? | A proposed answer to a question A hypothesis can NEVER be proven, only accepted or rejected A hypothesis must be testable |
| What is the 3rd step in making an observation? | Test your hypothesis Use an experiment to test your hypothesis |
| What are the 2types of variables? | Independent and dependent |
| Define independent variable | The factor that causes a change in the experiment Can be increased or decreased Example: the speed with which you walk or run |
| Define dependent variable | The factor that changes as a result of the independent variable Measurable variable (how wet you get) |
| How do you analyze your data? | Through the analysis of data, does the gathered info support the hypothesis |
| If your hypothesis is supported what is the next step? | More testing is always required Test the hypothesis with repeat experiments Prove it's validity |
| If your hypothesis is not supported what is the next step? | Revise hypothesis, retest, and analyze again |
| How do you develop a theory? | Through repeat experimentation if your hypothesis is true, you can develop a theory |
| Are theories ever proven? | NO, theories become stronger if the facts continue to support them Example: evolution |
| What is a law? | Repeated observations about patterns found in nature Accepted as fact Example: gravity |
| What is the formula of a water molecule? | H2O |
| What makes a water molecule a neutral molecule? | It has an equal # of electrons and protons |
| What is waters net charge? | Zero |
| What kind of molecule is water? | Polar molecule |
| Why is water called a polar molecule? | Because the oxygen end acts negatively charged and the hydrogen end acts positively charged |
| Is one hydrogen bond weak or strong? | One is weak,many are strong |
| How do hydrogen bonds form? | Electromagnetive atom of a polar molecule and hydrogen |
| At sea level what temp does water boil? Freeze? | 100*C 0*C |
| What happens to the boiling point of water at higher elevations where the atmospheric pressure is less? | Boiling temp of water decreases at higher elevations |
| Where will it take longer for an egg to boil Mt Everest or Death Valley? | Mt Everest |
| Name 5 properties of water that are important to life | Cohesion, adhesion, high specific heat, high heat or vaporization, less dense as a solid |
| What is cohesion? | Attraction between particles of the same substance |
| What is does cohesion produce when one water molecule attracts other water molecules? | Surface tension |
| What is surface tension a measure of? | How strong the water tension is |
| How does the film produced by surface tension help organisms? | Allows insects to walk on the surface |
| What is adhesion? | Attraction between two different substances |
| How does ADHESION differ from COHESION | Adhesion attracts different substances Cohesion attracts the same |
| What type of action does adhesion produce? | Capillary action as water is attracted to and pulled into a tube |
| What is transpiration? | The process in plants that causes capillary action |
| How do plants absorb water? | Though their roots and with capillary action or ADHESION to move water against gravity to the leaves |
| Name two things observed in nature that are a result of adhesion | Spider webs Blades of grass |
| What is specific heat? | The amount of heat needed to raise or lower 1gram of a substance 1*C |
| What is heat vaporization? | Amount of energy to convert 1gram of a substance |
| What must happen for water to evaporate? | Water must break its hydrogen bonds |
| What is waters heat of vaporization? | 540* |
| How does water warm the earth | Sun energy absorbed and held by vapor |
| Why does ice float in water? | Ice is less dense |
| Which is more dense, ice or water? | Water |
Created by:
Talfff
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