Answers: 2
Chemistry, 23.06.2019 13:30
The zinc within a copper-plated penny dissolves in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can reach the zinc). the reaction between the acid and the zinc 2h+(aq)+zn(s)→h2(g)+zn2+(aq) . when the zinc in a certain penny dissolves, the total volume of gas collected over water at 25 °c is 0.947 l at a total pressure of 743 mmhg . (vapor pressure of water is 23.78 mmhg at 25 °c .) what mass of hydrogen gas is collected? answer in appropriate significant figures
Answers: 3
Chemistry, 23.06.2019 15:00
20 look at the clock and the data table below. based on the data and on your knowledge of potential and kinetic energy, what is the best conclusion you can make about potential and kinetic energy? the total amount of energy stays the same. the clock has the most potential energy at point b since it is moving the fastest. there is always more potential energy than kinetic energy. potential energy can never be 0, but you can have 0 kinetic energy.
Answers: 1
Chemistry, 23.06.2019 15:30
Dona wrote the characteristics of two types of galaxies as shown below: type a: has a large flattened core type b: does not have a regular shape which statement is correct? type a is an irregular galaxy and type b is a lens galaxy. type a is a lens galaxy and type b is an irregular galaxy. type a is a spiral galaxy and type b is an elliptical galaxy. type a is an elliptical galaxy and type b is a spiral galaxy.
Answers: 2
Chemistry, 23.06.2019 16:30
Boron has an average atomic mass of 10.81. one isotope of boron has a mass of 10.012938 and a relative abundance of 19.80 percent . the other isotope has a relative abundance of 80.20 percent what is the mass of that isotope? report two decimal places
Answers: 1
Sr(OH)2 + FeCl3 = SrCl2 + Fe(OH)3...
Social Studies, 19.03.2020 10:35
Mathematics, 19.03.2020 10:35
Social Studies, 19.03.2020 10:35
Physics, 19.03.2020 10:35
Mathematics, 19.03.2020 10:35
History, 19.03.2020 10:35
Mathematics, 19.03.2020 10:35
History, 19.03.2020 10:35
Mathematics, 19.03.2020 10:35