Thêm 1 giọt (V = 0,03 ml) dung dịch KOH 0,084M vào 100 ml dung dịch HCOOH 2,45.10^{-5}M. Tính pH của dung dịch thu được (coi thể tích dung dịch thay đổi không đáng kể khi thêm KOH).

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

Select all that apply. a beta particle: is electromagnetic energy is an electron has zero charge is emitted from the nucleus has a +2 charge has a -1 charge

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat