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18 Cards in this Set
- Front
- Back
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independent variable
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the variable you control
ex. 4 different types of tape |
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dependent variable
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depends on iv. measure this during the experiment
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constant
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things that don't change
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control
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group doesn't. change
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hypothesis
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an if then statement
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how can you increase the validity of the results of an experiment
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run the experiment multiple times
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what is unique about water as it changes from a solid to a liquid
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particles leave a small open area in the middle of itself
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what is a chemical change? give an example
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occurs when a substance reacts and forms one or more new substances; iron rusting
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what is a physical change? give an example.
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when some of the properties of the material change, but the substances stay the same; cutting hair
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what is a mixture?
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a combo of 2 or more substances that are physically combined
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What is a proton?
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POSITIVEly charged subatomic particle. found in the nucleus
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what is an electron?
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NEGATIVEly charged subatomic particle found outside nucleus
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what is a NEUtron?
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a NEUtral particle found in the nucleus
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which subatomic particle determines the identity of an atom?
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protons
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what is an isotope
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atoms of the same element but have different numbers of neutrons and different mass numbers
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what does a mass number tell you about an atom?
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sum of protons and neutrons
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what does the atomic number tell you?
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number of protons and neutrons
usually electrons |
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describe what the diagram tells you about an atom
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18 protons
22 neutrons |
