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what are the the steps of the scientific method?
- 1.Make observations/develop a problem or purpose
- 2.Develop a hypothesis
- 3.Design an experiment
- 4.Collect data and observations
- 5.Draw conclusion
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What is an Independent variable?
Variable that I change
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What is an Dependent variable?
Variable that is measured
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What was the IV for the plastics lab?
type of plastic/polymer
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What is the DV for the plastics lab?
The distance that the plastic stretched after pulling on it
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Why is a control group important in an experiment?
Important for comparison purposes. Considered the normal group -- the results that we would expect until we introduced the independent variable into the mix. Not all experiments have a control group.
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What is the proper format for a testable hypothesis?
- If...then...because
- If- sections deals with the independent variable Then- section deals with the dependent variable Because- section details research on the particular topic
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What does validity mean?
Validity deals with how accurate experimental results are
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What is the formula for calculating density?
Density = mass/volume
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What is matter?
Anything that has mass and takes up space (volume)
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What is an element?
A substance that cannot be broken down into smaller substances
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Indicate which type of change (physical or chemical) is taking place?
-Baking a cake
-Cutting grass
-Melting ice
-Iron rusting
- 1.Chemical
- 2.Physical
- 3.Physical
- 4.Chemical
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How many atoms are in the following compounds?
-H2O
-CO2
-H2SO4
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In which type of bonding are the electrons completely transferred between atoms?
Ionic
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In which type of bonding are the electrons shared between the atoms?
Covalent
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Name the three general properties of an acid
1. Sour taste 2. Reacts to metal 3.Causes color to change in indicator
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Name the three general properties of a base
1.Feels slippery 2.Bitter taste 3.Causes color to change in indicator
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How many bonds can a carbon atom form?
With its four valence electrons, carbon can from four bonds
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Why is carbon referred to as such a versatile element?
Carbon's four valence electrons allow it to form many different structures (branched chains, straight chains, and rings). It can form single, double, and triple bonds with other elements.
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Define organic compound
Organic compound has carbon and hydrogen, and sometimes nitrogen and oxygen atoms COVALENTLY bonded together in a variety of compounds/structures
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When many monomers are linked together they form a_____
Polymer
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Give an example of a synthetic polymer
Plastics, rubber, and nylon
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Give an example of a natural polymer
DNA, protein, carbohydrates, and natural rubber
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What are the three main types of fossil fuels?
1. Petroleum 2. Natural gas 3. Coal
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