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Bio Test 1 (Explain the following terms (Experimental Group-have the…
Bio Test 1
Explain the following terms
Experimental Group-have the independent variable
Control Group-lacks independent
Constants-Things you need to keep doing in order to keep the experiment going
Placebo-When you think something is going on when really it is in your head
Dependent Variable-X Axes
Scientific Theory-an explanation for something that happens in the natural world
Independent Variable-Y Axes
Hypothesis-What you think is going to happen
Bias-weather or not a theory is true or false
Inference-a logical interpretation of observations based on prior knowledge or experience
Qualitative Observation-made with instruments (rulers, balances, graduated cylinder, and thermometer
Quantitative Observation-data that can be observed with our senses
4 Most Common elements in Living Things
Hydrogen
Nitrogen
Carbon
Oxygen
Solution-molecules are evenly distributed throughout the solvent
Solvent-The substance the solute is put in (water is the best solvent)
Solut-what is dissolved (sugar dissolves in water)
Scientific Method-Guidlines to set up an experiment
There is more than one Scientific Method
Scientific Method
Collect Results
Make a Conclusion
Conduct an Experiment
Look Over Results
State Hypothosis
Conclusion
Identify problen
Scientists use the Scientific Method so that they could compare their results after the experiment
Polar and Non-polar molecules
Polar Molecules-has a partial positive charge in one part of the molecule and complementary negative charge in another part
Non-polar Molecules-don't have any charge
A water molecule is H2O
Holds a covalent bond
Water is polar which means that there are bonds between separate molecules
Hydrogen bonds are the weakest bonds and are cohesion
Ionic Bonds-formed when 1 or more electrons are shared between atoms
Ions-atoms that have a change
Covalent Bonds-stronger than Ionic bonds