The alkali metals are first column, alkali earth 2nd, halogens 2nd to last, and noble gases last. Hope it helps!
Q unknown = -Q H2O
Q H2O= (100g x 4.18 J/g C x (25C - 20C)
Q H2O = 2090J
-2090J = (50g x c x (25C-90C)
-2090J = -3250c
.64 = c
I am a high school student and have done this problem a few months ago for my test, hope this helps
Gk faham
Karna saya orang Indonesia
Answer:
the equilibrium bond length of H137I is
Explanation:
The quantum state has a rotational energy which can be expressed mathematically
Here,
B is the rotational constant given as
We are given from the question that
Substituting we have
Where,
h is plank constant
r is radius
I is moment of inertia
Making the subject
The moment of inertia = Reduced mass ×
Therefore
Making the subject of the formula
Answer:
Here's what I get.
Explanation:
(a) F, Cl, Br, and I are called halogens (salt formers)
(i) They are placed in Group 17, the Group just before Group 18 (the noble gases), because they need just one more valence electron to get a noble gas electron configuration.
(ii) At room temperature, iodine is a lustrous, purple-black solid that melts to form a deep violet liquid at 114 °C.