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The half-life of actinium-228 is 6.13 hours. What amount of a 7.0 milligram sample remains after 24.52 hours?
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If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution
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Chemistry, 22.06.2019 08:00
Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next
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Chemistry, 22.06.2019 17:00
The biosphere of the earth is made up of what compound? organic or inorganic?
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Chemistry, 22.06.2019 21:30
Describe at least two advantages and two disadvantages of using hydropower as a source of energy.
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The half-life of actinium-228 is 6.13 hours. What amount of a 7.0 milligram sample remains after 24....
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