Scientists have used the big bang theory to make numerous predictions about the universe. One of their predictions is that about 75% of the visible matter in the universe should be hydrogen and about 25% should be helium.
How could a scientist test this prediction?
A.
measure the amount of cosmic microwave background radiation in the universe
B.
analyze the spectra of electromagnetic radiation from stars and galaxies
C.
compare the number of galaxies with blueshifted spectra to those with redshifted spectra
D.
collect molecular samples from stars and galaxies to determine their composition
Answers: 2
Chemistry, 22.06.2019 02:30
Asa choose the correct set of reaction coefficients to properly balance the following chemical equation according to the law of conservation of mass: __s8 + __o2 ==> __so2 1, 1, 8 1, 8, 1 1, 8, 8 8, 1, 1
Answers: 1
Chemistry, 22.06.2019 14:50
Which of the following is most likely true about water in chemical systems? a) water dissolves nonpolar ionic compounds. b) water dissociates ionic compounds. c) water dissociates covalent molecules. d) water dissolves nonpolar covalent substances.
Answers: 1
Chemistry, 22.06.2019 16:30
Asample of freon gas has a volume of 2.23 liters, a pressure of 4.85 kpa, and a temperature of -1.36°c. calculate the volume at a pressure of 1.38 kpa and a temperature of 5.5°c. (show work)
Answers: 1
Chemistry, 22.06.2019 17:30
A650 ml sodium bromine solution has a bromide ion concentration of 0.245 m. what is the mass (g) of sodium bromide in solution? a) 103.b)0.00155.c)16400.d) 16.4.e) 0.159
Answers: 2
Scientists have used the big bang theory to make numerous predictions about the universe. One of the...
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