Calculate the percentage by mass of nitrogen in magnesium nitrate. You will need the information below. Give your answer to the nearest whole percentage (e.g. 34%).

Answer:

Need the choices before i can give answers thanks

Explanation:

Answer:

The reaction is endothermic

Part A: Yes because there is an immediate reaction of bubbling vigorously.

Part B: It releases energy because when the compounds are added together they are immediately releasing it by bubbling and turning cold.

Part C: Yes because the liquids inside when combined give off coldness that makes the liquid temperature decrease to use this chemical reaction could definitely be used to keep something cold

Explanation:

Answer:

The reaction is endothermic

Part A: Yes because there is an immediate reaction of bubbling vigorously.

Part B: It releases energy because when the compounds are added together they are immediately releasing it by bubbling and turning cold.

Part C: Yes because the liquids inside when combined give off coldness that makes the liquid temperature decrease to use this chemical reaction could definitely be used to keep something cold

Answer:

The number of bonds for neutral atom is equal to the number of electrons in the full valence shell (2 or 8 electrons) minus the number of valence electrons.

Explanation:

This method works because each covalent bond that an atom forms adds another electron to an atoms valence shell without changing its charge.

Answer:

i think it's oxygen

Explanation:

the smart kid in my class said so lol

For the first question, the correct compound that the highway engineer should use is magnesium combined with chlorine and second, when CaCl dissolves in water, it dissociates into its constituent ions: Ca2+ and Cl-. This means that the compound breaks up into its individual ions in water.



The highway engineer looking for a de-icing compound should use magnesium combined with chlorine, as this combination will result in a compound with a +2 ion and a -1 ion. This is because magnesium has a +2 charge and chlorine has a -1 charge, which allows them to form a compound with the required ion charges. When CaCl dissolves in water, it dissociates into its constituent ions: Ca2+ and Cl-. This means that the compound breaks up into its individual ions in water.



In conclusion, the highway engineer should use magnesium combined with chlorine for de-icing compounds, as it will result in a compound with the required ion charges. When CaCl dissolves in water, it dissociates into its constituent ions, Ca2+ and Cl-.

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Answer: B. Shared electrons

Explanation: Electrons are shared in covalent bonds. The other options are all properties of metallic bonds.

Answer: 3.002 ==> C

Explanation:

3.00183 =

3.00183 =3.002 => since 8 is closer to 10 than to 0, add 1 to the 1 in 3.00183

3.002 ==> C

Balanced molecular equation and a net ionic equation for precipitation reaction with example is as follows:

Molecular equation

Hg₂(NO₃)₂ (aq) + KI(aq) ⇒Hg₂I₂(s) + 2KNO₃(aq)

Total Ionic equation

Hg²⁺(aq) + 2NO³⁻(aq) + 2K⁺aq) ⇒Hg₂I₂(s) + 2K⁺(aq) + NO³⁻ (aq)

Net Ionic equation

Hg²⁺(aq) + 2I⁻(aq)  ⇒ Hg₂I₂(s)

The only reference to a chemical equation is a balanced equation. Any ionic substances or acids are represented in a molecular equation as neutral compounds using their chemical formulae. The state of each substance is listed in parenthesis after the formula. In contrast to a net ionic equation, which only shows the chemical species participating in a reaction, a complete ionic equation also includes the spectator ions.

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Answer:

its FALSE

Explanation:

FAKE   ITS NOT REAL

Answer:

I believe its F: 2.55

Explanation:

I know I'm very late, positive you're past this question, I'd hope at least.

Answer:

True.

Explanation:

The chemical element, Chlorine has greater electronegativity than the chemical element, Aluminum.

Electronegativity can be defined as the ability or tendency of the atom of an chemical element to attract any shared pair of electrons.

On the other hand, Electron affinity can be defined as the ability of an atom of a chemical element to accept or accommodate an electron.

The pH of a 0.100 M solution of HCN with a Ka of 4.9e-10 is approximately 5.15.

To find the pH of a 0.100 M solution of the weak acid HCN (hydrocyanic acid) with a Ka of 4.9e-10, we need to set up an equilibrium expression and solve for the concentration of hydrogen ions (H+).

The dissociation equation for HCN in water is:

HCN(aq) ⇌ H+(aq) + CN-(aq)

The equilibrium expression for this dissociation can be written as:

Ka = [H+(aq)][CN-(aq)] / [HCN(aq)]

Given that the initial concentration of HCN is 0.100 M, we can assume x moles of HCN dissociate. Therefore, at equilibrium, the concentration of HCN will be (0.100 - x) M, and the concentrations of H+ and CN- will both be x M.

Substituting these values into the equilibrium expression:

4.9e-10 = [x][x] / (0.100 - x)

Since the value of x is expected to be small compared to 0.100, we can approximate (0.100 - x) as 0.100.

4.9e-10 = x^2 / 0.100

Rearranging the equation:

x^2 = 4.9e-10 * 0.100

x^2 = 4.9e-11

Taking the square root of both sides:

x ≈ √(4.9e-11)

x ≈ 7e-6

Now we have the concentration of H+ ions, which is approximately 7e-6 M. To calculate the pH, we take the negative logarithm (base 10) of the H+ concentration:

pH = -log[H+]

pH = -log(7e-6)

pH ≈ 5.15

Therefore, the pH of a 0.100 M solution of HCN with a Ka of 4.9e-10 is approximately 5.15.

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Answer:

chemical

Explanation:

A chemical change is irreversible and leads to the formation of new products.

Rusting occurs as a result of an irreversible chemical reaction between iron, oxygen and moisture. Rusting is the oxidation of iron when exposed to oxygen and moisture.

The rusting of iron is an electrochemical process in which water serves as the electrolyte and iron serves as the anode. The rusting of iron leads to the formation of hydrated iron III oxide (rust) usually seen an brown flakes that surround a rusted iron material.

Answer:

43.2

Explanation:

you use the charles law.

1) Substance: Magnesium.

2) Convert moles of magnesium to grams of magnesium.

The molar mass of magnesium is 24.3050 g/mol.

6.25 mol Mg is equal to 151.91 g Mg.

.

Answer:

9

Explanation:

7 is neutral anything higher than 7 is a base anything lower than 7 is an acid.

Answer:

B

Explanation:

it will not be waterproof anymore

The maximum number of moles of Fe3(PO4)2 that can be formed is 0.807 mol when 7.23 mol of FeCl2 and 4.39 mol of Na3PO4 are present.

In the given reaction, we have to find the maximum number of moles of Fe3(PO4)2 that can be formed using 7.23 mol of FeCl2 and 4.39 mol of Na3PO4.Reaction: FeCl2 + Na3PO4 → Fe3(PO4)2 + NaClWe will balance the given chemical equation to get the balanced chemical equation. FeCl2 + 3Na3PO4 → Fe3(PO4)2 + 6NaClThe balanced chemical equation is given above. Now we will use stoichiometry to solve the question.The molar ratio of FeCl2 to Fe3(PO4)2 is 1:1 from the balanced chemical equation.The molar ratio of Na3PO4 to Fe3(PO4)2 is 3:1 from the balanced chemical equation.Using the molar ratios and the given number of moles, we can calculate the maximum number of moles of Fe3(PO4)2 that can be formed.Let x be the number of moles of Fe3(PO4)2 formed.

According to the balanced chemical equation, moles of FeCl2 react with moles of Na3PO4 to form moles of Fe3(PO4)2.So, from the given number of moles of FeCl2, the number of moles of Fe3(PO4)2 formed is:x = 7.23 mol of FeCl2 × (1 mol Fe3(PO4)2/1 mol FeCl2)×(1 mol Na3PO4/3 mol Fe3(PO4)2)×(1 mol Fe3(PO4)2/1 mol Na3PO4) = 0.807 mol of Fe3(PO4)2Using the given number of moles of Na3PO4, the number of moles of Fe3(PO4)2 formed is:x = 4.39 mol of Na3PO4 × (1 mol Fe3(PO4)2/3 mol Na3PO4)×(1 mol FeCl2/1 mol Fe3(PO4)2)×(1 mol Fe3(PO4)2/1 mol Na3PO4) = 1.463 mol of Fe3(PO4)2.

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The molecule that provides the energy to drive endergonic reactions in the body is abbreviated as ATP, which stands for adenosine triphosphate. ATP is a high-energy molecule that serves as the primary source of energy for various cellular processes and reactions.

Endergonic reactions are those that require an input of energy to proceed. In biological systems, this energy is often provided by ATP. The ATP molecule is composed of a nitrogenous base (adenine), a sugar (ribose), and three phosphate groups. The energy stored in ATP is mainly found in the bonds between the phosphate groups.

When a cell needs energy for an endergonic reaction, ATP undergoes hydrolysis, a process in which a phosphate group is removed from the molecule, resulting in the formation of adenosine diphosphate (ADP) and an inorganic phosphate (Pi). This reaction releases the energy that can be utilized to power various cellular processes, such as muscle contraction, protein synthesis, and cellular transport.

Conversely, the energy released during exergonic reactions (reactions that release energy) can be harnessed to regenerate ATP from ADP and Pi. This continuous cycle of ATP hydrolysis and regeneration ensures that cells have a constant supply of energy to drive endergonic reactions and maintain various biological functions.

In summary, ATP is the key molecule that provides the energy required for endergonic reactions in the body. It acts as a universal energy currency, allowing cells to store, transfer, and utilize energy efficiently for a wide range of cellular processes.

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Answer:

61,000

Explanation:

Answer:

A

Explanation:

Answer:a

Explanation:

Answer:

200 kPa

(it is actually 199.999, but rounding up it is 200)

hope this helps!

Answer:

1500 Torr is  about 200 kPa

Answer:

The forensic scientist must be able to tell the difference between the substances.

Explanation:

It is important for forensic scientists to be able to identify particular drugs so they have evidence for the case that a certain drug was present.

The goal of forensic drug chemistry is to determine whether the material submitted contains an illegal substance.

To prepare 0.75 L of 0.25 M HCl from a stock solution of 12 M HCl, 15.625 mL of the stock solution should be taken.

To determine the amount of the stock solution needed to prepare the desired solution, we can use the dilution formula:

M1V1 = M2V2

where,

M1 = concentration of the stock solution

V1 = volume of the stock solution

M2 = desired concentration of the diluted solution

V2 = volume of the diluted solution

Now, plug in the values given in the problem:

M1 = 12 M

V1 = ?

M2 = 0.25 M

V2 = 0.75 L (750 mL)

Next, solve for V1:

M1V1 = M2V2

V1 = (M2V2) / M1V1 = (0.25 mol/L x 0.75 L) / 12 mol/LV1 = 0.015625 L (15.625 mL)

This is the volume of the stock solution required to make the 0.75 L of 0.25 M HCl. However, this is not the final answer since we need to find the volume of the 12 M HCl required. To do this, we need to use the formula:

M1V1 = M2V2

where,

M1 = concentration of the stock solution

V1 = volume of the stock solution

M2 = desired concentration of the diluted solution

V2 = volume of the diluted solution

Now, plug in the values that we know:

M1 = 12 M

V1 = ?

M2 = 12 M

V2 = 0.015625 L

Next, solve for V1:

M1V1 = M2V2

V1 = (M2V2) / M1V1 = (12 mol/L x 0.015625 L) / 12 mol/LV1 = 0.015625 L (15.625 mL)

Therefore, 15.625 mL of the stock solution should be taken to prepare 0.75 L of 0.25 M HCl.

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Answer: B. Nonconservative elements are reactive in seawater and have a short residence time.

Explanation: The non-conservative elements of seawater possess two paramount properties which include being chemically or biologically reactive as they are usually dependent on seasonal or short geological cycles. They also posses short residence time, which is the measure of the average time a dissolved substance spends in seawater. They also have varying concentration Ober time. Examples of nonconservative elements include; Iron and Carbon.

Here is a MATLAB code that calculates and plots the concentration profiles of NH ₃, NH₄+, NO₂-, and NO₃- as a function of time at T=298 K and neutral pH, given the rate constants and initial concentrations:

```matlab

% Rate constants (k) and initial concentrations ([C])

k1 = 0.1;   % Rate constant for NH₃ + H₂O₂ -> NH₂ + H₂O

k2 = 0.05;  % Rate constant for NH₂ + NO₃- -> NO₂- + H₂O

k3 = 0.08;  % Rate constant for NO₂- -> NO₃- + N₂

C_NH₃ = 1.0;    % Initial concentration of NH₃

C_H2₂O₂ = 0.5;   % Initial concentration of H₂O₂

C_NH₄ = 0.0;    % Initial concentration of NH₄+

C_NO₂ = 0.0;    % Initial concentration of NO₂-

C_NO₃ = 0.0;    % Initial concentration of NO₃-

% Time vector

t = 0:0.1:10;   % Time range from 0 to 10 with a step size of 0.1

% Calculation of concentrations at each time point

for i = 1:length(t)

   NH₃(i) = C_NH₃ * exp(-k1*t(i));

   NH₄(i) = C_NH₃ - NH₃(i);

   NO₂(i) = C_NO₂ + k₂ * (NH₄(i) - C_NH₄) * t(i);

   NO₃(i) = C_NO₃ + k₃ * NO₂(i) * t(i);

end

% Plotting concentration profiles

plot(t, NH₃, 'r-', t, NH₄, 'g-', t, NO₂, 'b-', t, NO₃, 'm-');

xlabel('Time');

ylabel('Concentration');

legend('NH₃', 'NH₄+', 'NO₂-', 'NO₃-');

```

The provided MATLAB code calculates and plots the concentration profiles of NH₃, NH₄+, NO₂-, and NO₃- as a function of time based on the given rate constants and initial concentrations. The code uses a time vector to define the time range for which the concentrations will be calculated.

Inside the for loop, the concentrations of NH₃, NH₄+, NO₂-, and NO₃- are calculated at each time point using the given rate constants and the previous concentrations. The concentration of NH₃ decreases exponentially over time due to the reaction NH₃ + H₂O₂ -> NH₂ + H₂O, where k1 is the rate constant. NH₄+ concentration is the difference between the initial NH₃ concentration and the current NH₃ concentration.

The concentration of NO₂- increases with time due to the reaction NH₂ + NO₃- -> NO₂- + H₂O, where k₂ is the rate constant. The change in NH₄+ concentration from its initial value is multiplied by k₂ and the time to calculate the increase in NO₂- concentration.

Finally, the concentration of NO₃- increases with time due to the reaction NO₂- -> NO₃- + N₂, where k₃ is the rate constant. The previous NO₂- concentration is multiplied by k₃ and the time to determine the increase in NO₃- concentration.

The resulting concentration profiles are then plotted using the plot function, with time on the x-axis and concentration on the y-axis. Each compound is represented by a different color line in the plot.

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The four mole ratios are: 6 KOH / 2 K₃PO₄, 2 KOH / 1 Co₃(PO₄)₂,

1 K₃PO₄ / 1 Co₃(PO₄)₂, 1 Co(OH)₂ / 2 KOH.

Mole ratio refers to the ratio between the number of moles of two substances in a chemical reaction.

The given chemical equation is:

2 KOH + Co₃(PO₄)₂ → K₃PO₄ + Co(OH)₂

And the first mole ratio given is:

6 KOH / 2 K₃PO₄

To find the other mole ratios, we need to first balance the chemical equation. It is already balanced, so we can proceed to find the other mole ratios:

(2) 2 KOH / 1 Co₃(PO₄)₂

This ratio indicates that two moles of potassium hydroxide react with one mole of cobalt(II) phosphate.

(3) 1 K₃PO₄ / 1 Co₃(PO₄)₂

This ratio indicates that one mole of potassium phosphate is produced for every mole of cobalt(II) phosphate that reacts.

(4) 1 Co(OH)₂ / 2 KOH

This ratio indicates that one mole of cobalt(II) hydroxide is produced for every two moles of potassium hydroxide that react.

Therefore, the four mole ratios are:

(1) 6 KOH / 2 K₃PO₄

(2) 2 KOH / 1 Co₃(PO₄)₂

(3) 1 K₃PO4 / 1 Co₃(PO₄)₂

(4) 1 Co(OH)₂ / 2 KOH

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Correct question is:

KOH + Co₃(PO₄)₂ →

With the above balanced equation, make atleast four mole ratios ( one is done for you ):

\(\frac{6KOH}{2K3PO4}\)    -      -        -

Answer: Its B,C,D, and E

Explanation:

The correct statements about the compound calcium chloride are Chlorine becomes a negative ion, The chemical formula is CaCl₂, Calcium transfers electrons to the chlorine atoms and The subscript 2 is used to balance the charge.

Hence, Option B, C, D and E are correct.

Calcium chloride is a crystalline white substance which is soluble in water. It is the chloride salt of calcium. The chemical formula of calcium chloride is CaCl₂. In calcium chloride, Calcium atom has two valence electrons.

Now lets check all statements one by one

Option (A): Calcium chloride is a ionic compound. Here calcium transfers its valence electrons to both chlorine atoms.

So, statement A is incorrect.

Option (B): In calcium chloride each chlorine atom gains 1 electron and we get a negatively charged ion Cl⁻.  

So, statement B is correct.

Option (C): In Calcium chloride the valency of calcium is +2 and the valency of chlorine is -1.  So the chemical formula is CaCl₂.

So, statement C is correct.

Option (D): In calcium chloride calcium transfer its two valence electrons to both the chlorine atoms.

So, statement D is correct.

Option (E): In calcium chloride the subscript 2 is used to balance the charge. The subscript show the number of atoms in compound.  

So, statement E is correct.

Thus, from the above conclusions we can say that The correct statements about the compound calcium chloride are Chlorine becomes a negative ion, The chemical formula is CaCl₂, Calcium transfers electrons to the chlorine atoms and The subscript 2 is used to balance the charge.

Hence, Option B, C, D and E are correct.

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Answer:

(i) In a bond amortization schedule, the book value represents the remaining amount of the bond principal that hasn't been paid off at a given point in time. When a bond is first issued, its book value equals its face value. As payments are made over the life of the bond, a portion of these payments reduces the book value. By the end of the bond's life, its book value will be zero, as the entire principal will have been paid off.

(ii) The formula for the book value B at time k, where k is the number of periods elapsed, is B = C + Cg - jan-kj.

Here:

- C is the redemption amount,

- g is the modified coupon rate per period,

- j is the yield rate per period, and

- a_n-kj is the present value of an annuity immediate with n - k periods at the yield rate j.

This formula states that the book value at any time k is the redemption amount plus the present value of the future coupon payments (Cg), minus the present value of the annuity that represents the repayments of the bond (jan-kj).

The amortized amount at time k is the change in the book value from time k-1 to time k, plus the coupon payment at time k. It represents the portion of the bond's principal (and interest) that has been repaid up to time k.

(iii) If K is defined as the present value of the redemption value C, according to the Makeham formula, (C-K) would represent the difference between the redemption value of the bond and its present value. This difference is the amount of interest that will accumulate over the life of the bond. In other words, (C-K) can be interpreted as the total interest that the bondholder will earn from holding the bond until redemption, assuming that all coupon payments are reinvested at the yield rate j.

Explanation:

The molarity of the KBr solution would decrease from 0.50 M to 0.25 M after water is added to double its volume.

When water is added to double the volume of a 0.50 M KBr solution, the molarity of the solution decreases. Molarity is defined as the number of moles of solute per liter of solution.

When water is added, the total volume of the solution increases while the amount of solute (KBr) remains constant. Consequently, the concentration of KBr in the solution decreases.

Since molarity is a measure of concentration, doubling the volume while keeping the same amount of solute reduces the molarity by half. In this case, the molarity of the KBr solution would decrease from 0.50 M to 0.25 M after water is added to double its volume.

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