Blank is rock in molten form
What is this please help...
Answers: 2
Chemistry, 22.06.2019 06:30
Predict whether the changes in enthalpy, entropy, and free energy will be positive or negative for the boiling of water, and explain your predictions. how does temperature affect the spontaneity of this process?
Answers: 1
Chemistry, 22.06.2019 10:00
How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?
Answers: 3
Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
Mathematics, 27.03.2021 20:00
English, 27.03.2021 20:00
Social Studies, 27.03.2021 20:10
Mathematics, 27.03.2021 20:10
Mathematics, 27.03.2021 20:10
Mathematics, 27.03.2021 20:10
Mathematics, 27.03.2021 20:10
Chemistry, 27.03.2021 20:10
Mathematics, 27.03.2021 20:10
Mathematics, 27.03.2021 20:10
Mathematics, 27.03.2021 20:10
Mathematics, 27.03.2021 20:10
Mathematics, 27.03.2021 20:10