Chemistry, 13.05.2021 01:00 hunterbrod9903
5. The heat of combustion of a sample of coal is 5500 cal/g. What quantity of this coal must be
burned to heat 500.0 g of water from 20.0°C to 90.0°C?
6. The heat of combustion of a sample of coal is 5500 cal/g. What quantity of this coal must be
burned to heat 50.0 g of ice from 20.0°C to 90.0°C?
7. One gram of anthracite coal gives off 7000. cal when burned. How many joules is this?
How many grams of anthracite are required to raise the temperature of 4.0 L of water
from 20.0°C to 100.0°C?
8. A 500.0-g piece of iron is heated in a flame and dropped into 400.0 g of water at 10.0°C.
The temperature of the water rises to 90.0°C. How hot was the iron when it was first
removed from the flame? (Specific heat of iron is 0.473 J/gºC.)
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Answers: 3
Chemistry, 22.06.2019 12:30, nekathadon
The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms
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Chemistry, 22.06.2019 19:00, innocentman69
How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next
Answers: 1
Chemistry, 22.06.2019 19:20, halledoll2002
Anyone who's in connections academy chemistry b have the factors that affect the rate of a reaction portfolio already done?
Answers: 3
5. The heat of combustion of a sample of coal is 5500 cal/g. What quantity of this coal must be
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