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Matter can be composed of what two substances?
Pure or mixture
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A pure substance may either be?
An element or compound
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A mixture may either be?
Homogenous or heterogenous
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What is a physical change?
Matter chamges its appearance but not its composition.
Ex: melting
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What is a chemical change?
Matter changes its composition.
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Diagram of chemical reaction.
Reactants—>chemical reaction—>products
ReactantS are what is present before the chemical change. Products is what its called after the chem. Reaction.
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In the conservation of mass, is there new matter?
No.
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What r the major two components in our universe?
Mass and energy
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What is the law of conservation energy?
Energy is neither created or destroyed.
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What is the SI unit of energy?
Joule.
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1 calorie = joules?
4.184 j
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1 Calorie (Cal) = calories?
1000 cal
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1 kilowatt-hour (kWh) = joules?
3.60 x 10 6 joules
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Label smallest to biggest.cal, J, kWh, cal, Cal
J, cal, Cal, kWh
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What is the K (kelvin) formula?
K = C (celsius) + 273.15
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What is the C (celsius) formula?
C = (F - 32) / 1.8
Celsius and fahrenheit both contain neg. Temps. Kelvin scale doesn't.
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