Can you please help on 17 and 18 pleaseeee

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:

Rain shadow

Explanation:

Climate is the average weather condition of a place over a long period of time.

The image shows a rain shadow effect around a mountainous region. The type of rainfall controlled this way is known as an orographic rainfall.

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:

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:

it's answer is true

hope it helps you

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.

The mass of sodium hydrogen carbonate : 10.5 g

Given

1.5 dm' of CO₂

1 mol gas= 24 L at RTP(25 °C, 1 atm)

Required

the mass of sodium hydrogen carbonate

Solution

Decomposition reaction of Sodium hydrogen carbonate :

2 NaHCO₃ (s) ⇒ Na₂ CO₃ (s) + H₂ O(g) + CO₂ (g)

mol CO₂ :

[tex]\tt mol=\dfrac{1.5}{24}=0.0625[/tex]

From the equation, mol ratio of NaHCO₃ : CO₂ (g) = 2 : 1, so mol NaHCO₃ :

[tex]\tt 2\times 0.0625=0.125[/tex]

Mass NaHCO₃(MW=23+1+12+3.16=84 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=0.125\times 84\\\\mass=10.5[/tex]

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:

(a). 0.0037 mol.

(b). 22.42 L

(c). => When the measuring apparatus are not precise.

=> Error due to parallax.

=> Random errors.

Explanation:

Without mincing words let us dive straight into the solution to the question above. So, we are given the following parameters or information which are going to aid in solving this particular Question;

Mass of magnesium given= 0.0795 g, volume of Hydrogen = 88.5 mL = 0.0885 L, temperature = 25 degree C = 273 + 25 = 298K and pressure = 766 mm Hg = 766/760 = 1.00789 atm.

(a). In order to determine the number of moles of Hydrogen atoms,we will be making use of the formula below;

Number of moles = (pressure × Volume)/ gas constant,R × Temperature.

Thus,the number of moles of Hydrogen = 1.00789 × 0.0885 / [( 0.08206 × 298] = 0.0037 mol.

(b). The molar volume at stp can be calculated by using the same formula that was used in (a) above;

Molar Volume at stp = Gas constant,R × temperature/ Pressure = 0.08206 × 273 / 1 atm = 22.42 L.

(c). The major sources of errors are given below:

=> When the measuring apparatus are not precise.

=> Error due to parallax.

=> Random errors.

Answer:b) 2.53

Explanation:

Solution :

From Fick's law:

[tex]$\frac{D_{AB}}{\Delta z } \times (C_{A1}-C_{A2})=N_a$[/tex]

Mass balance: Exits = Accumulation

[tex]-N_A A = \frac{dm}{dt}[/tex]

[tex]-N_A A = \frac{dVp}{dt}[/tex]

[tex]-N_A A = \frac{dV}{dt}p[/tex]

[tex]-N_A A = \frac{dhA}{dt}[/tex]

[tex]-N_A A = \frac{dh}{dt} \times Ap[/tex]

From the last step, area cancels out and thus leaves :

[tex]-N_A = \frac{dh}{dt} \times p[/tex]

So now we can substitute the [tex]$N_A$[/tex] by the Fick's law

[tex]$\frac{D_{AB}}{\Delta z } \times (C_{A1}-C_{A2})=\frac{dh}{dt} p$[/tex]

Substituting the values we get

[tex]$=\frac{-4 \times 10^{-13}}{0.0001} \times (3 \times 10^{26} - C_{A2}) = \frac{dh}{dt} \times 2.46$[/tex]

[tex]$=-4 \times 10^{-9} \times( 3 \times 10^{26} - C_{A2}) = 0.0001 \times 2.46$[/tex]

[tex]$= -7800 \times 4 \times 10^{-9} \times (3 \times 10^{26}-C_{A2})=0.000246$[/tex][tex]$=-(3 \times 10^{26}-C_{A2}) = 7.8846 \times 100 \times \frac{1}{69.62} \times 6.022 \times 10^{23}$[/tex]

[tex]$C_{A2} = 6.85 \times 10^{28} \ \text{ boron atoms} /m^3$[/tex]

Answer:

its -3,811.92 aka.) A

Explanation:

The overall enthalpy of the reaction is represented in the graph by the letter A. The activation energy is represented by the letter B and the activated complex is represented by C.

The energy diagram of a reaction represents the energy change with respect to the rate of the reaction. It clearly depicts the energy profile of reactants and products, transition state of the reaction, activation energy and the overall enthalpy of the reaction.

The given diagram represents the energy profile for the photosynthetic reaction. The state with the highest activation energy is called transition state of the reaction. The minimum energy that must be acquired by the reactants to overcome the barrier potential is called activation energy.

For the given graph, the activation energy is represented by the letter B. The overall enthalpy of the reaction is represented in the graph by the letter A and the activated complex is represented by C.

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Your question is incomplete. But your complete question probably was:

Letter__shows the overall enthalpy of reaction.

Letter___shows the activation energy for the reaction

The activated complex is represented by

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:

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:

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:

uifhiuwrhuio fw

Explanation:

hfuiwehgu34iht3uht34[pht349348ut0tg

Answer:

Reading on left looks like 1.4

Explanation:

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:

3

Explanation:

there are three types of muscles:

Answer:

option B is a right answer

Explanation:

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Answer:

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

Explanation:

Answer:

At the cathode in an electrolytic cell, ions in the surrounding solution are reduced into atoms, which precipitate or plate out on to the solid cathode. The anode is where oxidation takes place, and the cathode is where reduction takes place.

Explanation:

Since positive ions pick up electrons at the negatively charged cathode, reduction takes place there.

The process of obtaining electrons or a decrease in an element's oxidation state in such a chemical reaction would be known as reduction, which is the movement of electrons among species. An increase in the number of electrons connected to a single or a collection of atoms is the result of a reduction chemical process.

The electron would be a subatomic particle with a negative one elementary charge electric charge. Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, have been typically regarded to be elementary particles.

In an electrolytic cell, the cathode is where ions in the neighboring medium could be converted into atoms, which then plate out or precipitated onto the solid cathode. Both oxidation and reduction occur at the anode but also cathode, respectively.

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Answer:

In the nucleus of an atom ,there are protons & neutrons. Protons have charge of 1.6× 10^-19 C, while neutrons have 0C charges. Electrons orbit outside the atom. Their charge is - 1.6 ×10^-19C

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.