Chemistry, 08.11.2019 20:31 bobjill1609
What does the period number of an atom indicate? a. period numbers are equal to the number of valence electrons in an atom. b. period numbers are equal to the number of orbital rings in an atom. c. period numbers are equal to the number of protons in an atom. d. period numbers are equal to the size of an atom.
Answers: 1
Chemistry, 21.06.2019 22:30
Complete the sentence. the lower the hydrogen ion concentration, the the ph. higher lower closer to 7 closer to 0
Answers: 2
Chemistry, 22.06.2019 04:20
Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h
Answers: 1
Chemistry, 22.06.2019 13:30
How many protons, electrons, and neutrons are in each of the following isotopes? a. zirconium-90 b. palladium-108 c. bromine-81 d. antimony-123
Answers: 1
Chemistry, 22.06.2019 18:00
Answer asap need to be answered 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: 3
What does the period number of an atom indicate? a. period numbers are equal to the number of valen...
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