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Chemistry, 21.06.2019 20:30
Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?
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Chemistry, 22.06.2019 10:30
Asample of air with a volume of 2.20m3 at a pressure of 105 kpa and a temperature of 30c is cooled to 10c and the pressure is reduced to 75.0 kpa. what is the new volume? 6.9 1.34 2.56 43.0 2.88
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Chemistry, 22.06.2019 10:40
Asolid that forms and separates from a liquid mixture is called
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Chemistry, 22.06.2019 19:40
What causes different colors to appear in the sky? the absorption of light by air molecules the reflection of light by bodies of water the greenhouse effect in earth's atmosphere the scattering and reflection of light by dust particles
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Which of the two compounds, H2NNH2 and HNNH, has the strongest nitrogen-nitrogen bond, and which has...
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