Please help and thank you

Answer:

pH = 5.37

Explanation:

We'll begin by obtaining the concentration of the hydrogen ion in the solution. This can be obtained as follow:

HNO₃ (aq) —> H⁺ (aq) + NO₃¯ (aq)

From the balanced equation above,

1 mole of HNO₃ produced 1 mole of H⁺.

Therefore, 4.3×10¯⁶ M HNO₃ will also produce 4.3×10¯⁶ M H⁺.

Finally, we shall determine the pH of the solution. This can be obtained as follow:

Concentration of Hydrogen ion [H⁺] = 4.3×10¯⁶ M

pH =?

pH = –Log [H⁺]

pH = –Log 4.3×10¯⁶

pH = 5.37

Therefore, the pH of the solution is 5.37

Answer:

HI

H₂O

H₃O⁺

I⁻

Explanation:

Bronsted-Lowry acids are chemicals that can donate protons, and Bronsted-Lowry bases are chemicals that can accept them. Conjugate bases and acids are the resulting effect of losing or gaining a proton in the form of H⁺.

Answer:

(C) 180.0 g of C6H12O6 dissolved in 500.0 mL of solution

Explanation:

Molarity is mole/volume.

1. Find the mass of C6H12O6 in 1 Liter of 2.0 solution

(2 mol C6H12O6 / L) * (180 g / mol C6H12O6) = 360 g C6H12O6

There are 360 g C6H12O6 in 1000 mL of solution

2. Compare the value you found in step 1 to each of the multiple choice answers.

180.0 g of C6H12O6 dissolved in 500.0 mL of solution is exactly proportional to 360 g C6H12O6 in 1000 mL of solution.

The preparation which produces a 2.0 M solution of C₆H₁₂O₆ is 180.0 g of C₆H₁₂O₆ dissolved in 500.0 mL of solution.

Molarity is defined as the number of moles of solute present in per liter of solution.

Moles of any substance will be calculated as :

n = W/M, where

W = given mass

M = molar mass

In the question given that molar mass of C₆H₁₂O₆ is 180 g/mole, and let we have produced the solution of 2 molarity by these amount in 1 liter i.e.

2 = n/1

n = 2 moles

Now by using these moles we can calculate the required mass of C₆H₁₂O₆ as:
2 = W/180

W = 360g

From this it is clear that for the preparation of 1 liter of solution of 2 molarity 360g of C₆H₁₂O₆ is required. So in 500mL of solution, 180 g of C₆H₁₂O₆ will use.

Hence, option (C) is correct i.e. 180.0 g of C₆H₁₂O₆ dissolved in 500.0 mL of solution.

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Answer:

E_a = 103.626 × 10³ KJ/mol

Explanation:

Formula to solve this is given by;

Log(k2/k1) = (E_a/2.303R)((1/T1) - (1/T2))

Where;

k2 is rate constant at second temperature

k1 is rate constant at first temperature

R is universal gas constant

T1 is first temperature

T2 is second temperature

We are given;

k1 = 2.8 × 10^(-3) /s

k2 = 4.8 × 10^(-4) /s

R = 8.314 J/mol.k

T1 = 60°C = 333.15 K

T2 = 45°C = 318.15 K

Thus;

Log((4.8 × 10^(-4))/(2.8 × 10^(-3))) = (E_a/(2.303 × 8.314))((1/333.15) - (1/318.15))

We now have;

-0.76592 = -0.00000739121E_a

E_a = -0.76592/-0.00000739121

E_a = 103.626 × 10³ KJ/mol

Answer:

this is your answer.....

Answer:

See Explanation

Explanation:

In discussing the reason why Et₃SiCl is more easily hydrolysed than Et₃CCl, we must remember that the electronegativity difference between silicon and chlorine is much higher than the electronegativity difference between carbon and chlorine.

As a result of this, the Si-Cl bond in Et₃SiCl is more polar and hence susceptible to attack by water than the C-Cl bond in Et₃CCl.

Also, it is postulated that the presence of vacant d orbitals on silicon assists hydrolysis in Et₃SiCl. Such vacant orbitals are absent in carbon hence Et₃CCl does not undergo hydrolysis.

The reaction scheme is shown in the image attached to this answer.

Answer:

Exothermic reaction

Explanation:

An exothermic process releases heat, causing the temperature of the immediate surroundings to rise

The potential energy diagram for a reaction starts at 180 kJ and ends at 300 kJ. the type of reaction does the diagram best represent exothermic reaction.

An exothermic reaction would be one in which heat energy is emitted. Exo stands for "evolve out." The term "thermos" refers to a container that holds heat. The term "exothermic" refers to a process in which heat is produced. In general, an exothermic reaction is one in which heat is released as a byproduct.

Therefore, the reaction diagram will represent exothermic reaction.

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Answer:

One way an animal may adapt to the environment and change characteristics is for example lizards. Lizards are preyed on by birds and other small mammmals. To avoid this some lizards have adapted to color changes or camofaluge.

Explanation:

Answer:

take a octopus for example, they change thw color of their skin to match their environment to stay hidden.

Explanation:

or take a decomposing plant for example, they mimik the process of decomposing to draw animals away

Answer: A planet from a rain forest would not survive in a desert home, for the fact they depend on water and as these live from water, without it, this leads to dehydration and with loss of water with plants, nothing is able to survive when it comes to a rain forest plant being in a desert home. Another reason is the high trees and leaves that are providing the plants enough sunlight or shade to grow, it guarantees to help keep the temperature normal. Being in a deserted area would mean that there would be a temperature change, something the plant is not used to. Without that needed shade and avoiding the scorching sun, they will die out from how different the temperature is, and how hot it is.

Explanation: I hope this helped you.

okay, the answer should be simple and easy, plants from a rainforest would not survive in a desert because the plants in the rainforest do get water, sunlight and air whereas the plants in the desert have Sunlight which is very hot. so if a plant in the rainforest was transferred to the desert it will hard to survive and it will eventually die because they will not get water that will be needed and the plant can get sunburns with the too hot temperature.

Answer:

pH = 14

Explanation:

pOH = -log[OH-] = -log1,0 = 0

pH + pOH = 14

pH = 14 - pOH = 14 - 0 = 14

Answer:

Explanation:

hope it helps

The mass of a substance is the product of its density and volume. Thus, the   mass of the dissolved solids with a density of 125 mg/dm³ with a volume of 250 cm³ is 31.25 mg.

Density of a substance is the measure of its mass per unit volume. Thus it describes how much denser the substance is in a given volume. Mathematically it is the ratio of mass to the volume.

Density of a substance depends on the mass, volume, bond type, temperature and pressure. The ratio of density of a substance with the density of water is called its specific gravity.

It is given that the density of the dissolved solids is 125 mg/dm³ and the volume is 250 cm³ or 0.25  dm³. Thus the mass can be calculated as follows:

density = mass/volume

 mass   = density × volume

             = 0.25  dm³  ×  125 mg/dm³

             = 31.25 mg

Hence, the mass of the dissolved solids in the river wayer is 31.25 M=mg.

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Answer:

Not really sure, buts its either B or C.

Answer:

Aluminum oxide (Al₂O₃)

Explanation:

The standard heat (or enthalpy) of formation of a compound, is the amount of change in the enthalpy that takes place when 1 mole of the compound is produced from the elements it contains whereby the compounds and elements in the reaction are in their standard states

The standard state of an element, is the state in which the element is in the most stable form at a pressure of 1 bar

Therefore, the heat of formation of hydrogen, H₂, oxygen, O₂, and potassium, (K), will have a heat of formation of zero, while Al₂O₃ which is made of aluminum and oxygen in combining to form a compound in proportions which are different from their initial standard states will have a heat of formation not equal to zero

Answer:

k = [F2]² [PO]² / [P2] [F2O]²

Explanation:

In a chemical equilibrium, the equilibrium constant expression is written as the ratio between the molar concentration of the products over the molar concentration of the reactants. Each species powered to its reaction coefficient. For the equilibrium:

P2(g) + 2F2O(g) ⇄ 2PO(g) + 2F2(g)

The equilibrium constant, k, is:

k = [F2]² [PO]² / [P2] [F2O]²

Answer:

the answer is 4=Be 9 =F 16=S 17 = CL

Explanation:

atomic no 4 = beryllium (Be)

" " 9 = fluorine (F)

16 = sulfur (S)

17 = chlorine (CL)

The atomic number of Beryllium is 4, the atomic number of fluorine is 9,  atomic number of sulfur is 16 and the atomic number of chlorine is 17.

The atomic number is defined as the number of protons in the nucleus of an atom or the number of electrons revolving around the nucleus in orbits or shell.

So we can conclude that he atomic number of Beryllium is 4, the atomic number of fluorine is 9,  atomic number of sulfur is 16 and the atomic number of chlorine is 17.

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Answer:

C: checking your email

Explanation:

I believe that C would be impossible, as you cannot use wireless networks without radio waves

The question is incomplete, the complete question is;

Arrange the following ionic compounds in order of decreasing amount of energy released in lattice formation: NaF, MgS, TlN, and CsI.

Answer:

TlN> MgS > NaF > CsI

Explanation:

Recall that lattice energy is the energy evolved when a crystal lattice is formed from its component ions.

The lattice energy depends on the size of the ions. The smaller the sizes of the ions, the larger the lattice energy.

The order of energy released in lattice formation for these compounds is;

TlN> MgS > NaF > CsI

Answer:

No. If you were to set up what the friend said it would look like this:

19.7g × [tex]\frac{grams}{moles}[/tex] ==>  [tex]\frac{19.7 grams}{1}[/tex] ×

The above does not look right because the grams do not cancel out. If it's not cancelled, it would be included in your final answer, but you're looking for moles not grams.

When setting up a stoichiometry equation, you have to put the same unit of measurement (ex- grams, cm, mm, etc.) on the numerator of one side and the denominator of the other side.

This would cancel out the unit.

For example: If you wanted to find out how much of 320 cm are in a meter.

*there are 100 cm in 1 meter*

(1. always start with the given number!)

(2. set up the next fraction where you can cancel out cm)

[tex]\frac{320cm}{1}[/tex] × [tex]\frac{1 meter}{100 cm}[/tex] = 3.2 m

Going back, your friend would have to switch the units from grams/moles to moles/grams. It would cancel out grams, which would leave moles. Therefore, moles will be included in your final answer.

[tex]\frac{19.7 grams}{1}[/tex] × [tex]\frac{moles}{grams}[/tex] = _?_ moles

You will take the ratio of mass and molar mass. Hence my friend is wrong.

The formula for calculating the number of moles is expressed as:

[tex]Moles=\frac{mass}{molar mass}[/tex]

Given the following

Mass = 19.7 grams

Since the molar mass is measured in gram per mole, hence to get the number of moles, you will take the ratio of mass and molar mass. Hence my friend is wrong.

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Answer:

6 that will be the answer

Answer:

A. 20.866%

Explanation:

First, we calculate molar mass of Li3PO3

Molar mass of Li3PO3 = 6.9 (3) + 31 + 16(3)

= 20.7 + 31 + 48

= 99.7g/mol

To calculate the percent composition of Lithium, we say:

Mass of lithium in compound/mass of compound × 100

% composition = 20.7/99.7 × 100

= 0.208 × 100

= 20.8%.

Coal is extracted by mining.

Once coal has been extracted, it can be used directly  for heating and industrial processes or to fuel power plants for electricity.

Benefits are:

Coal energy is an affordable energy source because of the coal's stable price compared to other fuel sources.

Coal is easy to burn.

Coal produces high energy upon combustion.

Coal energy is inexpensive.

Answer:

Option 1

Explanation:

p can hold upto 6 e-.

It would be easy if it gains 2e-, instead of losing 4e-, to be stable.

It gains 2e, and gets a charge of - 2e.

It forms O (2-)

Answer:

Living things can have a minimum of one cell

Explanation:

Living things can have a minimum of one cell; these are called unicellular organisms. Some examples of unicellular organisms: bacteria, algae (plants), some fungi, and protozoa

hope this helps!

In an ecosystem ,cell is the minimum amount of material that must be present in a living organism.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

Explanation:

Fridge magnets are made of weakly ferromagnetic ceramics like barium ferrite or strontium ferrite. The magnetic field created by the fridge magnet aligns the spins of unpaired electrons in metal atoms in the fridge in such a way that the magnet and the fridge door are attracted to each other; this force keeps the magnet stuck to the fridge.

Answer:

the fridge is a magnet

Explanation:

magnets connect to fridge

Answer:

A solution with a pOH of 4.3 has a [H+] of 2*10⁻¹⁰ M.

Explanation:

The pOH (or potential OH) is a measure of the basicity or alkalinity of a solution.

pOH indicates the concentration of hydroxyl ions [OH-] present in a solution. It is defined as the negative logarithm of the activity of hydroxide ions. That is, the concentration of OH- ions:

pOH= -log [OH-]

On the other hand, pH is also a measure of the basicity or alkalinity of a solution. POH is an indicator that is related to pH by:

pOH + pH= 14

So, if the solution has a pOH equal to 4.3, the pH is calculated by:

4.3 + pH= 14

pH= 14 - 4.3

pH= 9.7

The pH is defined as the logarithm of the concentration of H+ ions, with the sign changed:

pH= -log [H+]

So, in this case:

9.7= - log[H+]

Solving

[H+]= 2*10⁻¹⁰ M

A solution with a pOH of 4.3 has a [H+] of 2*10⁻¹⁰ M.

Explanation:

[tex]PV = nRT \\ (200000 \times 3.5 \times {10}^{ - 6} ) = n \times 8.314 \times 300 \\ n = \frac{0.07}{2494.2 } \\ n = 2.81 \times {10}^{ - 5} [/tex]

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Answer:

A the boiling point to increase

Explanation:

That is a colligative property

Answer:

34.92 grams NaCl (in 1 L of solution)

Explanation:

The chemical formula of sodium chloride is NaCl. From the formula, we can calculate the molar mass of NaCl:

MM(NaCl)= MM(Na) + MM(Cl) = 23 g/mol + 35.4 g/mol = 58.4 g/mol

A solution of NaCl with a molarity of 0.598 M has 0.598 moles of NaCl per liter of solution. So, we multiply the moles by the molar mass of NaCl to calculate the mass we need:

mass of NaCl = 0.598 mol x 58.4 g/mol = 34.92 g NaCl

Therefore, we need 34.92 grams of NaCl to prepare 1 liter of a solution with a molarity of 0.598 M.