* How many joules of heat are required to heat 125 g aluminum from 19.0 degree Celsius to 95.5 degree Celsius?
* A 135 g sample of a metal requires 2.50 kJ to change its temperature from 19.5 degree Celsius to 100.0 degree Celsius. What is the specific heat of the metal?
* A 100.0 g sample of copper is heated from 10.0 degree Celsius to 100 degree Celsius.
a) Determine the number of Joules needed.
b) The same amount of heat is added to 100.0 g of aluminum initially at 10.0
degree Celsius. What is the final temperature of the aluminum?
c) Which metal got hotter, the copper or aluminum?
(20) A sample of iron was heated to 125.0 degree Celsius, then placed into 375.0 g of water initially at 19.8 degree Celsius. The final temperature of both was 25.6 degree Celsius. How much grams of iron were in the sample?
(21) The specific heat of a human is approximately 3.47 J/g degree Celsius and normal body temperature is 37.0 degree Celsius.
a) If a 165.0 lb person eats a candy bar containing 262.0 Cal, how much will their
body temperature increase if all the calories from the candy are converted into
heat energy?
b) If a 165.0 lb person eats candy bar containing 25.0 Cal, how much will their
body temperature increase if all the calories from the candy are converted into
heat energy
Answers: 1
Chemistry, 22.06.2019 07:00, erickamurillo9929
In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?
Answers: 2
Chemistry, 23.06.2019 03:30, nikkio4
In chemistry, the type of an atom (what element it is) is determined by: a) the number of protons it contains in its nucleus. b) the number of neutrons it contains in its nucleus. c) the number of protons it has in a cloud around the nucleus. d) the number of neutrons it has in a cloud around the nucleus. e) the number of electrons it exchanges with its neighbors.
Answers: 1
* How many joules of heat are required to heat 125 g aluminum from 19.0 degree Celsius to 95.5 degre...
Mathematics, 01.10.2019 23:30
Mathematics, 01.10.2019 23:30