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Composed of only one type of atom or molecule
Ex: pure water |
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The composition of the mixture is the same throughout, mixture is uniform throughout and well stirred
EX: salt water, sweet tea |
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Compounds separate, varies from one region to the other
EX: oil and water |
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- Matter is neither created nor destroyed in a chemical reaction.
- In chemical reactions, the changes in mass are so minute that they can be ignored
- During physical and chemical changes, the total amount of matter remains constant.
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| Unit measurement of Energy |
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Joule- J
calorie- cal
1cal=4.184 J |
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| Formula to find temperatures in Kelvin, Celsius, and Fahrenheit |
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K = C + 273.15
C = (F - 32) / 1.8
F = 1.8 C + 32 |
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| Is the quantity of heat required to change the temperature of a given amount of the substance by 1 degree Celsius. |
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| The amount of the substance is expressed in grams and has units of joules per gram per degree Celsius (J/g*C) |
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| Heat = mass x specific heat capacity x temp change |
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What substance is a pure substance
(A) gold
(b) water
(c) milk
(d) fruit cake
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Which property of trinitrotoluene (TNT) is most likely a chemical property?
(a) yellow color
(b) melting point is 80.1°C
(c) explosive
(d) none of the above |
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Which change is a chemical change?
(a) The condensation of dew on a cold night
(b) a forest fire
(c)the smoothening of rocks by ocean waves
(d) None of the above |
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| A 35-g sample of potassium completely reacts with chlorine to form 67g of potassium chloride. How many grams of chlorine must have reacted? |
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A runner burns 2.56x10^3 kJ during a 5 mile run. How many nutritional Calories did the runner burn?
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| Convert the boiling point of water (100.00°C) to K |
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Substance A has a heat capacity that is much greater than that of substance B. If 10.0g of substance A initially at 25.0 °C is brought into thermal contact with 10.0g of B initially at 75.0 °C, what can you conclude about the final temperature of the two substances once the exchange of heat between the substances is complete?
(a) The final temp will be between 25-50
(b) The final temp will be between 50-75
(c) The final temp will be 50
(d) You can conclude nothing about the final temp w/o more info |
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Definition
| The final temp will be between 25-50 |
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