Chemistry, 12.03.2021 05:30 yesimabadbih5147
5. A hot 0.25-kg piece of iron is placed in a calorimeter containing room temperature watechemistryr. How much heat is lost by the iron as it cools from 125°C to 75°C? GIVEN WORK ANSWER
6. How much heat is gained by the water in #5?
PLEASE ANSWER
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Chemistry, 21.06.2019 19:30
List the two type of transporst that the cell in orde to transport molecules acroos the membrane
Answers: 1
Chemistry, 22.06.2019 16:00
What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided
Answers: 2
Chemistry, 22.06.2019 16:50
Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.
Answers: 1
Chemistry, 22.06.2019 19:20
For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)
Answers: 1
5. A hot 0.25-kg piece of iron is placed in a calorimeter containing room temperature watechemistryr...
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