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3 years ago

Chemistry ques class 10 plz answer it plzzzpzzzzx solve it

Chemistry

1 answer:

weqwewe [10]3 years ago

7 0

Fe2O3 + 2Al => Al2O3 + 2Fe↓

reaction of changing.

In this type of reaction one element or group of elements from one substance is changed with a single element.

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How are continental drift and plate tectonics related

harina [27]

The continent rest on massive slabs of rocks called tectonics

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3 years ago

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A 0.1000 mol L^-1 aqueous solution of HCl in a cell with plates having area 7.200 cm² separated by 3.600 cm has a resistance R =

Alex17521 [72]

Explanation:

The given data is as follows.

Molarity = 0.1 M, Area = 7.2 $cm^{2}$

Resistance = 12.553 ohm, Length = 3.6 cm

As it is known that relation between resistance, length and area is as follows.

R = $\rho \frac{l}{A}$

and, $\frac{1}{R} = \frac{1}{\rho} \times \frac{A}{l}$

$k = c \times x$

where, k = specific conductivity

c = conductance

x = cell constant

Therefore, value of c = $\frac{1}{R}$ = $\frac{1}{12.553}$ = 0.0796 per ohm

x = $\frac{l}{A}$ = $\frac{3.6 cm}{7.2 cm^{2}}$

= 0.5 per cm

Hence, calculate the value of specific conductivity as follows.

$k = c \times x$

= $0.0796 per ohm \times 0.5 per cm$

= 0.0398 per ohm per cm

Relation between molar ionic conductivity and specific conductivity is as follows.

$\lambda_{m} = \frac{k \times 1000}{M}$

= $\frac{0.0398 \text{per ohm per cm} \times 1000}{0.1 M}$

= 398 $\Omega^{-1} cm^{2} mol^{-1}$

Also, $\Omega^{-1}$ = Siemen

$\lambda_{m} = 398 S cm^{2} mol^{-1}$

thus, we can conclude that value of molar ionic conductivity of given hydrogen ions is $398 S cm^{2} mol^{-1}$ .

6 0

3 years ago

When salt is placed on ice the ice melts. explain why?

Licemer1 [7]

Explanation:

When salt is added to ice, salt first dissolves in the film of liquid water that is always present on the surface, thereby lowering the ice's freezing point

please mark as brainliest ,I really need it

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4 years ago

A car has a mass of 1,000 kilograms. The weight of the car is__newtons. Use g = 9.8 N/kg for gravity.

Nikolay [14]

9800 Newtons, this is correct I got 5/5 on the online school test

4 0

3 years ago

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Indicate which solution in each pair has the lower pH. Your response should be a four letter "word". The first letter should be

JulijaS [17]

Answer:

bcfh

Explanation:

HClO₄ reacts with water thus:

HClO₄ + H₂O → H₃O⁺ + ClO₄⁻

That means HClO₄ produce H₃O⁺ that decreases pH. That means the higher concentration of HClO₄ decreases pH. Thus, lower pH will be:

b) 0.2 M HClO4

The reaction of NaClO₄ is:

NaClO₄ + H₂O → OH⁻ + HClO₄ + Na⁺

The higher concentration of NaClO₄ the higher production of OH⁻ that increase pH, that means the lower concentration of NaClO₄ the lower pH, thus, the answer is:

<em>c) 0.1 M NaClO or</em>

HF reacts with water thus;

HF ⇄ H⁺ + F⁻

The equilibrium constant is:

k = [H⁺] [F⁻] / [HF] = 3,5x10⁻⁴

For HNO₂ equilibrium is:

HNO₂ ⇄ H⁺ + NO₂⁻

k = [H⁺] [NO₂⁻] / [HNO₂] = 4,5x10⁻⁴

As k value is higher for HNO₂, the concentration of H⁺ will be higher in this system doing the HNO₂ with the lower pH.

f) 0.1 M HNO2

NaOH is a strong base that produce OH⁻ that increase pH, pure water is neutral, thus, the lowe pH is:

h) pure water

I hope it helps!

7 0

4 years ago