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Chemistry, 21.06.2019 22:20
Much of the general structure and physical properties of the interior of the earth are inferred from: a)deep oil and gas bore holes b)geologic investigations c)analysis of seismic waves d) study of volcanoes
Answers: 1
Chemistry, 21.06.2019 23:00
A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?
Answers: 1
Chemistry, 22.06.2019 10:00
The reactions shown here can be combined to make the overall reaction c(s) + h2o(g) โ co(g) + h2(g) by reversing some and/or dividing all the coefficients by a number. a. c(s) + o2(g) โ co2(g) k=1.363ร10^69 b. 2 h2(g) + o2(g) โ 2 h2o(g) k=1.389ร10^80 c. 2co(g) + o2 (g) โ 2 co2(g) k=1.477ร10^90
Answers: 1
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
Why ethyne is a linear molecule?...
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