Chemistry, 22.07.2019 03:30 molinaemily009
Andrea is performing an experiment in which she needs to know when a strong acid is present. she is not sure which indicator to use, so she looks up the following table in her science textbook. indicator ph range thymol blue 1.2 - 2.8 phenol red 6.4 - 8.0 phenolphthalein 8.0 - 10.0 trinitrobenzoic acid 12.0 - 13.4 according to the textbook, which indicator should andrea use? hint: neutral substances have a ph of 7. acids have a ph that is less than 7, and bases have a ph that is greater than 7. a. phenolphthalein b. phenol red c. thymol blue d. trinitrobenzoic acid reset submit
Answers: 1
Chemistry, 22.06.2019 07:30
Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?
Answers: 1
Chemistry, 22.06.2019 15:30
Count the number of each type of atom in the equation below, and then balance the equation. write in the numbers of atoms and coefficients. add a 1 if there should be no coefficient. cs2(l) + o2(g) → co2(g) + so2(g) c [ ] s [ ] o > c [ ] s [ ] o [ ] cs2(l) + [ ] o2(g) > [ ] co2(g) + [ ] so2(g)
Answers: 3
Chemistry, 22.06.2019 19:20
Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?
Answers: 3
Chemistry, 22.06.2019 22:30
You just calculated that the heat of fusion for chloromethane is 6400 j/mol. the heat of fusion for hydrogen is 120 j/mol.? which of the following account for this difference? more than one correcta. chloromethane can absorb more energy at the same temperature. b. hydrogen has stronger intermolecular forces than chloromethane. c. hydrogen molecules can pack more closely than chloromethane molecules. d. chloromethane experiences dipole-dipole interactions. e. chloromethane has a higher molar mass than hydrogen.
Answers: 3
Andrea is performing an experiment in which she needs to know when a strong acid is present. she is...
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