CHEMISTRY HELP!
Can anyone help me understand or explain why my answer was wrong and why the correct answer is right? Please help!

Answer:

Due higher critical temperature, condensability and gas solubility.

Explanation:

The permeability of packaging materials to CO2 is 6 times higher than the permeability to O2 and nitrogen because carbondioxide gas has higher condensability and higher gas solubility in membranes. Due to its higher condensability and solubility, carbondioxide gas is more permeable that other gases such as oxygen and nitrogen gases. Carbondioxide gas also have  higher critical temperature than other gases which make it more permeable than other gases.

Answer:

Reading on left looks like 1.4

Explanation:

Answer:

B

Explanation:

An electroplating happen when metal ions form a solid layer on a metal cathode. Therefore, option B is correct.

The term electroplating is defined as the process of aligning another metal on the metal. Electroplating is usually used to change the physical properties of an object.

An electroplating is accomplished by an electroplating apparatus that contain a brine solution, a battery, wires, and alligator clips that kept carbon rods attached to the metal to be electroplated and the metal to be layered.

This process is used to give objects increased wear resistance, corrosion protection or aesthetic appeal and greater thickness. While electroplating is like advanced technology. It is primarily used to change the physical properties of an object.

Thus, option B is correct.

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Answer:

it's answer is true

hope it helps you

Explanation:

ball and socket joint.

it made of the round end of a bone fitting into a cup shaped socket in another.

example of ball and socket joint is the shoulder and hips

Answer:

Photosynthesis reactions are naturally occurring processes that take place in all green plants and most algae. During this process the plant uses light energy, carbon dioxide, and water to make food and then releases oxygen which all living organisms require to the atmosphere.During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen. These sugar molecules are the basis for more complex molecules made by the photosynthetic cell, such as glucose

Explanation:

Answer:

Mitosis.

Explanation:

During mitosis, two nuclei must form, so that one nucleus can be in each of the new cells after the cell divides. In order to create two identical nuclei, the DNA inside of the nucleus must be copied or replicated.

Answer:

second box is 2 C, third box is 3 C, and the last box is 3 C.

Explanation:

the concentration of H* ions at a pH =2 = 10⁻²

the concentration of H* ions at a pH =6 = 10⁻⁶

a solution with a pH of 2 has 10⁴ times more hydrogen ions than a solution with a pH of 6

The concentration of H + ions in solution is measured in pH units. The greater the concentration of H + ions, the more acidic the solution will be, and vice versa if the concentration of H + ions is getting smaller, the more basic the solution and the greater the hydroxide concentration

The ph unit is on a scale between 0-14.

pH> 7, the solution is said to be alkaline

pH <7, the solution is said to be acidic

pH = 7, the solution is said to be neutral

Acidic solutions will have more hydrogen ions than hydroxide ions

A solution with a different value of n has a 10ⁿ difference in the concentration of H⁺ ions.

pH can be formulated:

[tex]\tt \boxed{\bold{pH=-log[H^+]}}[/tex]

[tex]\tt 2=-log[H^+]\\\\(H^+]=10^{-2}[/tex]

[tex]\tt 6=-log[H^+]\\\\(H^+]=10^{-6}[/tex]

pH 2 and pH 6

[tex]\tt \dfrac{10^{-2}}{10^{-6}}=10^4[/tex]

So a solution with a pH of 2 has 10⁴ times more hydrogen ions than a solution with a pH of 6

Answer:

Temperature and pressure

Explanation:

As you go down within the earth from the crust to the core, the temperature and pressure levels increases significantly.

The deeper one goes within the earth, the hotter and more pressurized it becomes.

Answer:

C . Gravitational force

Explanation:

Answer:

Gravitational force

Explanation:

Gravitational force is commonly known as gravity or gravitation, which  is a force that exists between all the objects present in this universe. For any two objects or particles having non-zero mass, a force of gravity exists between the which tends to attract them towards each other.

Answer: 1. halve

2. halve

3. double

Explanation:

The relationship between wavelength and energy of the wave follows the equation:

[tex]E=\frac{hc}{\lambda}[/tex]

E= energy

[tex]\lambda [/tex] = wavelength of the wave

h = Planck's constant  

c = speed of light

Thus as wavelength and energy have inverse realation, when wavelength will halve , energy will double.

2. The between wavenumber and energy of the wave follows the equation:

[tex]E=h\times c\times \bar{\nu}[/tex]

E= energy

[tex]\bar{\nu}[/tex][tex]\nubar[/tex] = wavenumber of the wave

h = Planck's constant  

c = speed of light

Thus as wavenumber and energy have direct relation, when wavenumber will halve , energy will be halved.

3. The relationship between energy and frequency of the wave follows the equation:

[tex]E=h\times \nu[/tex]

where

E = energy

h = Planck's constant  

[tex]\nu[/tex] = frequency of the wave

Thus as frequency and energy have direct realation, when frequency will double , energy will double.

Answer: The wire is still copper and does not change by cutting it

Explanation:

Democritus postulated that all materials were composed of these tiny particles called as "atomos".

Daltons postulates are:.

1. All matter is made of very tiny particles called atoms.

2. Atoms is indivisible.

3. Atoms of a given element are identical in mass and chemical properties.

4. Atoms of different elements have different masses and chemical properties.

5. Atoms combine in the ratio of small whole numbers to form compounds.

6. The relative number and kinds of atoms are constant in a given compound.

Thus when copper wire is cut into the smallest  possible pieces, the atoms were intact as they are indivisible and all atoms have same mass and chemical properties.Thus the wire is still copper and does not change by cutting it

It is useful to express a number in scientific notation is it makes large numbers easier to compare and work with. The correct option is B.

Scientific notation is a way of writing mathematical equations easily. It is used when the number is very large, and they are written in decimals. It is a standard form of writing in the United States.

An example is 1.332 x 10-3.

Thus, the correct option is B. It makes large numbers easier to compare and work with.

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Answer:

0.3hrs

Explanation:

Given parameters:

Average basal rate  = 15L/hr

Volume of oxygen  = 4.7L

Unknown:

Hours of oxygen use  = ?

Solution:

Now to solve this rate problem, we need to find the time;

 Hours of oxygen use  = [tex]\frac{volume of oxygen }{average basal rate}[/tex]  

 Hours of oxygen use  = [tex]\frac{4.7}{15}[/tex]   = 0.3hrs

Answer:

B. NaCl

Explanation:

NaCl is sodium chloride, one form of it is epsom salt which we consume!

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Answer:

0.11%

Explanation:

Without mincing words, let us dive straight into the solution to the question/problem. The first step to solve this question is to write out the chemical reaction, that is the reaction showing the dissociation of acetic acid.

CH3COOH <=======================================> CH3COO⁻ + H⁺

Initially, the amount present in the acetic acid which is = 12M, the concentration for CH3COO⁻  and H⁺ is 0 respectively.

At equilibrium, the amount present in the acetic acid which is = 12 - x, the concentration for CH3COO⁻ = x  and H⁺ = x respectively. Note that the ka for acetic acid = 1.8 × 10⁻⁵.

1.8 × 10⁻⁵ = x²/ 14 - x. Therefore, x = 0.0158 M.

The next thing to do is to calculate for the percentage of dissociation, this can be done as given below:

percentage of dissociation = x/14 × 100. Recall that the value that we got for x = 0.0158 M. Hence, the percentage of dissociation = 0.0158 M/ 14m × 100 = 0.11%

Answer:

Unit of power is watt

Explanation:

Power = rate of doing work

or

Power, P = W/t

Where

W is work done and t is time

The unit of work done is Joules and that of time is seconds.

Power, P = J/s

We know that, J/s = watts

Hence, the unit of power is watts.

Answer:

2NaCl + 1CaS → 1Na2S + 1CaCl2

Explanation:

The reaction in the question is a double-replacement reaction. The general formula is:

BX + CY → CX + BY

Where the cations of two salts exchange anions to produce 2 news products.

To balance the reaction:

NaCl + CaS → Na2S + CaCl2

We can balance as first the Na:

In reactants there is just 1 Na in NaCl but in products there are 2.

To balance Na:

2NaCl + CaS → Na2S + CaCl2

Now, there are 2 Na in reactants and products

There are 2 Cl in reactants and products

There is 1 Ca in both sides

And 1 S in both sides.

The balanced reaction is:

2NaCl + 1CaS → 1Na2S + 1CaCl2

Answer:

the answer is

2,1,1,1

Explanation:

Hope this helped!

Answer:

CaSO₃·2H₂O

Explanation:

Empirically => CaSO₃·nH₂O

%H₂O = n(H₂O)/f.wt. x 100%

23.1% = n(H₂O)100/Ca + S +3O + nH₂O

23.1 = n(18)·100/[40 + 32 + 3(16) + n(18)]

1800n = 23.1[40 + 32 + 3(16) + n(18)]

1800n = 924 + 739.2 + 1108.8 + 415.8n

1800n - 415.8n = 924 + 739.2 + 1108.8

1385n = 2772

n = 2772/1385 = 2

∴ numerical formula => CaSO₃·2H₂O

Answer:

0.879 mg

Explanation:

To solve this problem we need to use the definition of ppm:

With the above information in mind we can calculate the micrograms of lead using the concentration (13.97 ppm) and mass of solution (62.9 g):

Finally we convert μg to mg:

Answer:

3

Explanation:

there are three types of muscles:

Answer:

there u go

Explanation:

Answer:

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Explanation:

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