Answer:
because of the substance contained in a fire extingudher it woulfnt start a fire.
V1M1 = V2M2
<span>V1 × 2.5 = 1 × 0.75,
so V1 = 0.75/2.5
= 0.3 </span>
Answer:
copper will reach to higher temperature first.
Explanation:
Answer:
mmoles of potassium ion = 75.264 mmoles
mmoles of dichromate ion = 37.632 mmoles
Explanation:
Considering:-
For
:
Molarity = 0.0840 M
Volume = 448 mL
The mmoles of
are;-
In 1 mmole of
, 2 mmoles of potassium ion and 1 mmole of dichromate ion is present.
In 37.632 mmole of
, 2*37.632 mmoles of potassium ion and 1*37.632 mmole of dichromate ion is present.
<u>mmoles of potassium ion = 75.264 mmoles</u>
<u>mmoles of dichromate ion = 37.632 mmoles</u>
Answer:
Scandium, with atomic number of 21 = [Ar]3d¹4s²
Yttrium, with atomic number of 39 = [Kr]4d¹5s²
Lanthanum, with atomic number of 57 = [Xe]5d¹6s²
Actinium, with atomic number of 89 = [Rn]6d¹7s²
Explanation:
The electronic configuration of atoms of elements describes how electrons are arranged in the atomic orbitals of the atom. The electron configurations of atoms in standard notation is usually written sequentially with all electron-containing atomic subshells (s, p, d and f) and the number of electrons they contain in superscript. For example, the electron configuration of Neon is 1s²2s²2p⁶. However, an abbreviated notation can be used especially for elements having large atomic numbers. The symbol of the previous noble gas in square brackets indicating the core electrons is written before the outermost shell electrons of the atom. For example, the abbreviated electron configuration of sodium is [Ne]3s¹.
The electronic configuration of the given elements are shown below:
Scandium, with atomic number of 21 = [Ar]3d¹4s²
Yttrium, with atomic number of 39 = [Kr]4d¹5s²
Lanthanum, with atomic number of 57 = [Xe]5d¹6s²
Actinium, with atomic number of 89 = [Rn]6d¹7s²