The early 19th century work of John Dalton, particularly his advancement of atomic theory and the concepts of specific mass ratios in chemical reactions, is considered one of the first major series of events in the study of chemistry. Amedeo Avogadro further developed these ideas by defining Avogadro's number.
The origin of chemistry can be traced back to the practice of alchemy, with attempts to understand the behavior of matter dating back more than 2500 years. However, one of the first series of significant events in the
study of chemistry began in the early 19th century with John Dalton's work in atomic theory, which was based on quantitative measurements and helped establish the concept of atoms and molecules as fundamental units of substances. Dalton was also instrumental in establishing the concept of specific mass ratios in chemical reactions, which led to the development of formula mass - the sum of the average atomic masses of all atoms in a substance's formula. This work was later extended by the Italian physicist
Amedeo Avogadro, who developed the concept of a fixed number of atoms or molecules in a mole, known today as Avogadro's number.
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Answer:
a) 0.25 g b) 0.01542 g
Explanation:
Half life of Po-218 = 3.04 minutes
initial mass = 1 g
after 3.04 minutes it will remain 0.5 g
after another 3.04 minutes it will remain 0.25 g
After 6 minutes it will remain approx 0.25 g
B) after another 3.04 minutes it will remain 0.125 g
after another 3.04 minutes it will remain 0.0625 g
after another 3.04 minutes it will remain 0.03125 g
after another 3.04 minutes it will remain 0.015625 g
After 18 minutes it will remain approx 0.01542 g
well ... there are sm common things between solutions and colloids
solutions even and fully mixed together and so are colloids
when we let solutions and colloids settle down both of them do not have boundaries ... the particles of colloids and solutions do not settle down
Both are liquids. Both will pass through filters without seperation.
You can see through a solution, as the ions of the solute are dissolved. A colloid is a suspension of insoluble ultra microscopic particles or large molecules in water or other liquid, kept in suspension by Brownian motion.
Answer:
9.93
Explanation:
Your value for Kw is incorrect. The correct value is 5.48 × 10^-14.
pH + pOH = pKw
3.30 + pOH = -log(5.84 × 10^-14) = 13.23
pOH = 13.23 - 3.30 = 9.93
The pOH of the solution is 9.93.
The pOH of the solution is 10 .
Given that, the pH of the solution is 3.30, we also know that;
pH = - log[H^+]
Hence;
[H^+] = Antilog (-3.3)
[H^+] = 5.0 × 10^-4 M
But;
Kw = [H^+] [OH^-]
[OH^-] = Kw/[H^+]
The accurate value of Kw is 5.48 × 10^-14 not 5.48 x 10 9
[OH^-] = 5.48 x 10^-14/ 5.0 × 10^-4
[OH^-] = 1.1 x 10^-10 M
pOH = - log[1.1 x 10^-10 M]
pOH = 10
Learn more: brainly.com/question/1079292