Chemistry, 02.12.2020 17:50 indexes06

HELP 20 POINTS What is the frequency of an Electromagnetic wave has with wavelength 2.94 x 10^-8 cm?

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Chemistry, 22.06.2019 10:00, halohero7

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

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Chemistry, 22.06.2019 17:00, jazmine8194

Reduction is a reaction which results in a in electrons and a in positive charge of the atom or ion 1) a- loss 1) b- gain 2) a-increase 2) b-decrease

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Chemistry, 22.06.2019 19:40, trodgers0202

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests. which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory

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Chemistry, 23.06.2019 00:00, alisonsolis155

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3