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2 years ago

Hook was the first to discover cells in a cork. true or false?

Chemistry

1 answer:

aliina [53]2 years ago

5 0

True, Robert Hooke was the first person to discover cells inside a cork.

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Problem 12.002 the molar analysis of a gas mixture at 30°c, 2 bar is 40% n2, 50% co2, 10% ch4. determine

andreev551 [17]

The problem is incomplete. However, there can only be two probable questions for this problem. First, you can be asked the individual partial pressures of each gas. Second, you can be asked the volume occupied by each gas. I can answer both cases for you.

1.

Let's assume ideal gas.
Pressure for N₂: 2 bar*0.4 = 0.8 bar
Pressure for CO₂: 2 bar*0.5 = 1 bar
Pressure for CH₄: 2 bar*0.1 = 0.2 bar

2. For the volume, let's find the total volume first.

V = nRT/P = (1 mol)(8.314 J/mol-K)(30 +273 K)/(2 bar*10⁵ Pa/1 bar)
V = 0.0126 m³
Hence,
Volume for N₂: 0.0126 bar*0.4 = 0.00504 m³
Volume for CO₂: 0.0126*0.5 = 0.0063 m³
Volume for CH₄: 0.0126*0.1 = 0.00126 m³

3 0

3 years ago

How many grams of carbon (C) would be present in carbon monoxide (CO) that contains 2.666 grams of oxygen (O)? For example if th

oee [108]

Given :

Mass of oxygen containing carbon monoxide (CO) is 2.666 gram .

To Find :

How many grams of carbon (C) would be present in carbon monoxide (CO) that contains 2.666 grams of oxygen (O) .

Solution :

By law of constant composition , a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.

So , volume of solution does not matter .

Moles of oxygen , $n=\dfrac{2.666}{16}=0.167\ mole$ .

Now , molecule of CO contains 1 mole of C .

So , moles of C is also 0.167 mole .

Mass of carbon , $m=12\times 0.167=2\ g$ .

Therefore , mass of carbon is 2 grams .

Hence , this is the required solution .

5 0

2 years ago

How many valence electrons do the noble gases possess?

8090 [49]

Answer:

Have no valence electrons because they are stable.

Thank you.

BY GERALD GREAT

6 0

2 years ago

Do you expect a strong chemical bond to have a higher or lower frequency than a weak bond?

Llana [10]

Answer:

Higher frequency

Explanation:

We can imagine a chemical bond between two atoms as if it were two balls connected by a spring.

According to Hooke's Law, the stretching frequency f is

$f = \dfrac{1}{2 \pi}\sqrt{ \dfrac {k}{\mu}}$

where µ is the reduced mass of the system

$\mu = \dfrac{m_{1} + m_{2}}{m_{1}m_{2} }$

The strength of the bond is analogous to k, the force constant of the spring. Then,

$f \propto \sqrt{k}$

Thus, the stronger the bond, the greater the frequency of vibration.

6 0

3 years ago

Solution A is 100 times as acidic as solution B. What is the difference in pH values of solution A and solution B

devlian [24]

Answer:

The difference is 2 pH units.

Explanation:

Let's give an arbitrary value to the H⁺ concentration of solution A, [H⁺]ₐ:

[H⁺]ₐ = 0.001 M

If that's the case then the pH of solution A would be:

pHₐ = -log(0.001) = 3

----

The H⁺ concentration of solution B ( [H⁺]ₓ ) is 100 higher than that, so:

[H⁺]ₓ = 0.001 * 100 = 0.1 M

And its pH:

pHₓ = -log(0.1) = 1

So the difference in pH values is:

pHₐ - pHₓ = 3 - 1 = 2

3 0

3 years ago