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Digiron [165]
3 years ago
10

Which of the following best describes what led to London’s “killer fog” in 1952? a. Pollution from the air contaminated the wate

r supply which is what killed people. b. Millions of coal fires and stagnant air caused toxic fumes to build up in the air. c. Poor city design led to faulty ventilation in houses. d. Soot from forest and wildfires in the surrounding areas blew over the city.
Chemistry
2 answers:
abruzzese [7]3 years ago
8 0
<span>b. Millions of coal fires and stagnant air caused toxic fumes to build up in the air. The main cause of the coal fires, which burned at plants across England, was a weather pattern that produced cooler weather and air that did not circulate. Citizens used more heat and so more coal was burned. The post-war coal was not great quality and thereby included many toxins. The weather pattern created fog, which after it dispersed, left toxins and acid droplets to fall on the people.</span>
lesantik [10]3 years ago
6 0

just took the test. the answer is c. poor city design led to faulty ventilation in houses.

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The ph of a 0. 102 m solution of a weak acid (ha) is 1. 15 ka for the weak acid is?
Advocard [28]

The pH of the weak acid is 6.93.

Given,

K= 1.15 *10^{-6}

c=0.102

[H]= K*c= 1.15 *10^{-6} * 0.102= 0.1173 *10^{-6}

p[H]= -log[H]= 6.93

<h3>Weak acid</h3>

A weak acid is one that partially separates into its ions in water or an aqueous solution. A strong acid, on the other hand, completely splits into its ions in water. The conjugate base of a weak acid is also a weak base, and vice versa for the conjugate acid of a weak base. Weak acids have a higher pH than strong acids at the same concentration. Simple arrows pointing left to right are used to represent the reaction of a strong acid ionising in water. On the other hand, a weak acid ionising in water has a double arrow reaction arrow, indicating that both the forward and reverse reactions take place at equilibrium.

Learn more about Weak acid here:

brainly.com/question/22104949

#SPJ4

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1 year ago
What is the measure of the indicated angle? 37∘ 53∘ 180∘ 127∘
Nadya [2.5K]

Answer:

53∘

plz mark me as brainliest.

3 0
3 years ago
Calculate the solubility of CaF2 in g/L (Ksp = 4.0 x 10-8). 2. What is the pH of a solution containing a hydrogen ion concentrat
Pepsi [2]

Answer:

\large \boxed{1. \text{ 0.17 g/L; 2. 3.52; 3. Cl; 4. (a) +3; (b) +4; (c) +6}}

Explanation:

1. Solubility of CaF_2

(a) Molar solubility

CaF₂ ⇌ Ca²⁺ + 2F⁻

K_{\text{sp }} = \text{[Ca$^{2+}$]}\text{[F$^{-}$]}^{2}= 4.0 \times 10^{-8}\\s(2s)^{2}=4.0 \times 10^{-8}\\4s^{3} = 4.0 \times 10^{-8}\\s^{3} = 1.0 \times 10^{-8}\\s =2.2 \times 10^{-3}\text{ mol/L}

(b) Mass solubility

\text{Solubility} = 2.2 \times 10^{-3} \text{ mol/L} \times \dfrac{\text{78.07 g}}{\text{1 L }} = \text{0.17 g/L}\\\\\text{The solubility of CaF$_{2}$ is $\large \boxed{\textbf{0.17 g/L}}$}

2. pH

pH = -log [H⁺] = -log(3.0 × 10⁻⁴) = 3.52

3. Oxidizing and reducing agents

Zn + Cl₂ ⟶ ZnCl₂

\rm \stackrel{\hbox{0}}{\hbox{Zn}} + \stackrel{\hbox{0}}{\hbox{ Cl}_{2} }\longrightarrow \stackrel{\hbox{+2}}{\hbox{Zn}}\stackrel{\hbox{-1}}{\hbox{Cl}_{2}}

The oxidation number of Cl has decreased from 0 to -1.

Cl has been reduced, so Cl is the oxidizing agent.

4. Oxidation numbers

(a) Al₂O₃

\stackrel{\hbox{$\mathbf{+3}$}}{\hbox{Al}_{2}}\stackrel{\hbox{-2}}{\hbox{O}_{3}}

1O = -2; 3O = -6; 2Al  = +6; 1Al = +3

(b) XeF₄

\stackrel{\hbox{$\mathbf{+4}$}}{\hbox{Xe}}\stackrel{\hbox{-1}}{\hbox{F}_{4}}

1F = -1; 4F = -4; 1 Xe = +4

(c) K₂Cr₂O₇

\stackrel{\hbox{${+1}$}}{\hbox{K}_{2}}\stackrel{\hbox{$\mathbf{+6}$}}{\hbox{Cr}_{2}}\stackrel{\hbox{-2}}{\hbox{O}_{7}}

1K = +1; 2K = +2; 1O = -2; 7O = -14

+2 - 14 = -12

2Cr = + 12; 1 Cr = +6

8 0
4 years ago
Distinguish between elements,compound and mixture
Mrac [35]
An element is a substance that can’t be broken down into simpler substances by chemical means, a compound is when two or more elements are combined chemically to form something new, and a mixture is when two or more substances are combined but not chemically.
5 0
4 years ago
Plz answer these questions : <br><br>​
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Answer:   2) see below

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<u>Explanation:</u>

2)

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Step 2: Froth Flotation           CuFeS₂(s)---->  CuFeS₂ (l)

Step 3: Roasting   2CuFeS₂(l) + 3O₂(g) → 2FeO(s) + 2CuS(s) + 2SO₂(g)

Step 4: Converting matte to blister Cu₂S(l) + O₂(g) → 2Cu(l) + SO₂(g)

Step 5: Anode Casting           Cu(l) → Cu(s)

Step 6: Electrolytic Refining   Cu(s) → Cu(s)

            Anode: Cu(s) → Cu₂ + (aq) + 2e-

                     Cathode: Cu2 + (aq) + 2e- → Cu(s)

<em>see diagram below for illustration of steps</em>

3) When silver chloride (solid) is exposed to sunlight, it decomposes into silver (solid) and chlorine (gas).

The equation is written as:  2AgCl_{(s)}\xrightarrow{\text{sunlight}}}2Ag_{(s)}+Cl_{2(g)}

3 0
4 years ago
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