Chemistry, 04.10.2021 21:20 pjgolden04
When 2.23g of lead (II) oxide were heated in a stream of dry hydrogen gas 2.07g of lead were formed and 0.18g of water was collected. Calculate the mass of hydrogen which combines with one mole of oxygen atoms. (Pb= 207,0 = 16, H = 1) (3 marks)
Answers: 3
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Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?
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Chemistry, 22.06.2019 06:00
Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.
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Chemistry, 22.06.2019 16:50
Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.
Answers: 1
When 2.23g of lead (II) oxide were heated in a stream of dry hydrogen gas 2.07g of lead were formed...
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