Chemistry, 27.08.2019 06:00 ramentome7542
During the day, the temperature of the sand in a desert rises as the sand is heated by the sun. after the sun sets, the sand cools. what happens to the heat energy in the sand as it cools?
a) it is destroyed.
b) it is used by the sand to do work.
c) it goes back into the sun, completing the cycle.
d) it is transferred to the air via the process of radiation.
Answers: 1
Chemistry, 22.06.2019 20:00
State one important difference between a physical change and a chemical change?
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Chemistry, 22.06.2019 23:00
Consider the reaction: 2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) the δhf for fe2o3(s) = -824.3 kj/mole. the δhf for al2o3(s) = -1675.7 kj/mole. finish the equation. δhrxn = [(1)( kj/mole) + (2)( kj/mole)] - [(1)( kj/mole) + (2) ( kj/mole)]
Answers: 1
Chemistry, 23.06.2019 00:00
What is the pressure of 0.500 moles of carbon dioxide gas in a 2.5 l tank and at a temperature of 301 k? (r=0.0821 l·atm/mol·k) 3.08 atm 1.2 atm 0.23 atm 4.01 atm 4.94 atm
Answers: 1
During the day, the temperature of the sand in a desert rises as the sand is heated by the sun. afte...
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