Which of the following materials is damaged by acid rain
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Answer: The mass of aluminium cylinder is 4065 kg.
Explanation:
Density is defined as the ratio of mass of the object and volume of the object.
Mathematically,
We are given:
Density of aluminium =
Volume of aluminium cylinder =
Putting values in above equation, we get:
Hence, the mass of aluminium cylinder is 4065 kg.
therefore; 2700g/m^3 X 1.50m^3 = 4050g = 4.05Kg
Just use the units of density (mass/volume) and the units of what's given to figure it out :)
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Answer: ratio is 10⁻⁵
Explanation:
From Acid-dissociation equilibrium constant, HA is given thus,
HA + H₂O ⇄ H₃O⁺ + A⁻
equilibrium constant, Ka = [H₃O⁺] [A⁻] / [HA]
[H₃O⁺] = Ka [HA] / [A⁻]
from this we have that
pH = -log[H₃O⁺]
and pKa = -logKa
Applying Henderson-Hassel bach equation;
pH = pKa + log [A⁻]/[HA] ...........(1)
A⁻ rep the salt and HA rep the acid
at a given pH of 7, the pKa value of carboxylic acid COOH is 3
∴ from equation (1).
7 = 3 + log(COO⁻/COOH)
log(COO⁻/COOH) = 4
thus (COO⁻/COOH) = 10⁻⁴ ...................(2)
The ratio of alanine COOH to COO- at pH 7 is (COO⁻/COOH) = 10⁻⁴
(ii) Also considering the ratio of alanine NH2 to NH3+ at pH 7 we have;
given Pka value is 8,
therefore pH = pKa + log [salt]/[base]
7 = 8 + log (NH₂/NH₃)
(NH₂/NH₃) = 10⁻¹
thus the ratio of the concentration of the neutral amino acid species to the zwitterionic species at pH 7 is;
10⁻⁴ ˣ 10⁻¹ = 10⁻⁵
cheers i hope this helps
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1st object- 45kg*m/s
45=5v
V=9m/s
The velocity if the second object is 9 meters per second
(B) fluorous acid
(C) perfluoric acid
(D) hydrofluoric acid
(E) hypofluorous acid
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FALSE
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Answer:
FALSE
Explanation:
Critical temperature can be defined as the temperature at which a substance can exist as a liquid. Below the critical temperature, the substance will freeze and above the critical temperature, the substance will evaporate.
Note: Liquid cannot evaporate below it's critical temperature
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Answer:
Explanation:
that when water is boiled in a open beaker and it disappears that it evaporates into the air