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3 years ago

Why is the arm often described as a sort of lever?

Chemistry

2 answers:

siniylev [52]3 years ago

8 0

Answer:

because the bones in the arm often pivot just like a lever does.

Korolek [52]3 years ago

3 0

The long bones in the arm pivot around the elbow like a lever!

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The melting of ice cream is an example of which of the following?

Rus_ich [418]

It is physical change because ? has changed alone not with chemicals

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4 years ago

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If 2.0×10−4 moles of S2O2−8 in 170 mL of solution is consumed in 170 seconds , what is the rate of consumption of S2O2−8?

Ostrovityanka [42]

Answer : The rate of consumption of $S_2O_2^{-8}$ is, $7.0\times 10^{-6}M/s$

Explanation : Given,

Moles of $S_2O_2^{-8}$ = $2.0\times 10^{-4}mol$

Volume of solution = 170 mL = 0.170 L (1 L = 1000 mL)

Time = 170 s

First we have to calculate the concentration.

$\text{Concentration}=\frac{\text{Moles}}{\text{Volume of solution}}$

$\text{Concentration}=\frac{2.0\times 10^{-4}mol}{0.170L}$

$\text{Concentration}=1.2\times 10^{-3}M$

Now we have to calculate the rate of consumption.

$\text{Rate of consumption}=\frac{\text{Concentration}}{\text{Time}}$

$\text{Rate of consumption}=\frac{1.2\times 10^{-3}M}{170s}$

$\text{Rate of consumption}=7.0\times 10^{-6}M/s$

Thus, the rate of consumption of $S_2O_2^{-8}$ is, $7.0\times 10^{-6}M/s$

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3 years ago

A woman weighing 450 Newtons sits on the floor. She exerts a force on the floor of

ANEK [815]

Answer: let me figure it out rlly quick

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3 years ago

In the electrolysis of water, how long will it take to produce 165.0 L of H2 at 1.0 atm and 273 K using an electrolytic cell thr

vladimir2022 [97]

In the electrolysis of water, 3490 hour will it take to produce 165.0 L of H2 at 1.0 atm and 273 K using an electrolytic cell through which the current is 113.0 mA.

<h3>What is Ideal Gas Law ?</h3>

The ideal gas law states that the pressure of gas is directly proportional to the volume and temperature of the gas.

It is expressed as

PV = nRT

where,

P = Pressure

V = Volume in liters

n = number of moles of gas

R = Ideal gas constant

T = Temperature in kelvin

Here,

P = 1.0 atm

V = 165.0 L

R = 0.0821 atm. L/mol.K (Ideal gas constant)

T = 273 K

n = ?

Now put the value in above expression, we get

PV = nRT

1.0 atm × 165.0 L = n × 0.0821 atm. L/mol.K × 273 K

165.0 atm. L = n × 22.4 atm. L/mol

$n = \frac{165.0\ \text{atm. L}}{22.4\ \text{atm. L/mol}}$

n = 7.36 mol

The reaction is

2H⁺ + 2e⁻ → H₂

1 mol of electrons is produced from 96500 C

So,

$96500 \frac{C}{\text{mol} \times e} \times 2e \times 7.36\ \text{mol}$

<em>= </em>1,420,480 C

<u>Convert milliampere to C/s</u>

1mA = 0.001 C/s

113.0 mA = 113.0 × 0.001

= 0.113 c/s

<h3>What is relationship between current, charge and time ?</h3>

The relation between current, charge and time is expressed as:

$I = \frac{Q}{t}$

where,

I = Current

Q = Charge in Coulomb

t = time

Now put the value in above formula we get

$I = \frac{Q}{t}$

$= \frac{1,420,480\ C}{0.113\ C/s}$

= 12,570,619.469 s

= 3490 hour

Thus from the above conclusion we can say that In the electrolysis of water, 3490 hour will it take to produce 165.0 L of H2 at 1.0 atm and 273 K using an electrolytic cell through which the current is 113.0 mA.

Learn more about the Ideal Gas Law here: brainly.com/question/25290815

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2 years ago

Help me out here I don’t understand please :((((((, ppl srsly answer my questions a week later :/

kow [346]

Answer:

2. For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number.

3. in fact, electron mass is so small that it is not counted in an atom's mass

Explanation:

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3 years ago

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