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25 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What are the steps in the scientific method?
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1. make observations
2. define a problem 3. create a hypothesis 4. design an experiment 5. results 6. conclusion |
make...
define... create... design... ... ... |
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What is a hypothesis?
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an educated guess
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What is a control?
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something that stays the same
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What are the different types of variables?
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-independent variable: the thing that you change through the experiment
-dependent variable: the thing that changes in response to changing the independent variable |
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What was Redi's experiment?
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To disprove spontaneous generation, Redi put meat in a jar without the lid as the control, and after a few days, there were maggots in the jar. He tried to experiment again, but with a lid on the jar, and a few days later there were no maggots in the jar.
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meat and flies
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What is spontaneous generation?
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the hypothesis that life could arise from nonliving matter
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disproven in Redi's experiment
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What are characteristics of all living things?
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1. made up of cells
2. reproduce 3. are based on a universal genetic code 4. grow and develop 5. obtain and use materials as energy 6. respond to their environment 7. maintain a stable internal environment 8. change over time |
8 characteristics, mragormc
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What are the levels of organization in biology?
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molecule, cell, groups of cells, organism, population, community, ecosystem, bioshpere
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starts with molecule...
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What are atoms made up of?
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subatonic particles:
-protons (+ charge) -neutrons (neutral) -electrons (- charge) valence rings - first one holds 2 electrons , then the next hold 8 |
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What is an isotope?
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atoms of the same element that have different amounts of neutrons
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What are elements made up of?
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one type of atom
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What are compounds?
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formed by the chemical combination of two or more substances
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What are the 3 types of bonds?
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ionic, covalent, hydrogen
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What is an ionic bond?
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A bond in which electrons are trnsferred from one element to the next
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What is a covalent bond?
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A bond in which electrons are shared between elements
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What type of bond bonds within water molecules?
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covalent bond
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What type of bond bonds water molecules together?
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hydrogen bonds
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What makes a molecule polar?
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if it has a (+) and a (-) charge
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What is the difference between a mixture and a pure substance?
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A mixture is physically combinded, and the substances can be separated by physical means. A pure substance is chemically combined, and it forms in a fixed ratio.
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What is the difference between a solution and a suspension?
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I a solution, all of the substances are dissolved, but in a suspension, the solte is not dissolved in the sovlent.
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What is a chemical reaction?
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a process that changes one set of chemicals into another set of chemicals
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What is a reactant?
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the elements or compounds that enter into a chemical reaction
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What is a product?
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the elements or compounds produces by a chemical reaction
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What is activation energy?
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the energy needed to start a reaction
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What do catalysts / enzymes do?
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speed up a reaction by lowering activation energy
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