4. Scientists are observing and recording data for two different planets, planet X
and planet Y. Each planet orbits a different star. The planets have the same
mass. The scientists record the following data.
Star X-Planet X Star Y - Planet Y
Distance (millions of kilometers) 100
Gravitational Pull (Newtons)
390
260
100
Which of the following statements is most likely true?
a. The star close to planet Y is cooler.
b. The star close to planet Y has more mass.
c. The star close to planet X has more mass.
d. The sthr close to planet X is hotter.
Answers: 1
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The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams
Answers: 2
Chemistry, 22.06.2019 09:40
Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?
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How does a noncompetitive inhibitor reduce an enzyme’s activity?
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What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added
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4. Scientists are observing and recording data for two different planets, planet X
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