Which of the following elements can form double covalent bonds?

Answer:

The concentration of hydrogen ions in a solution can be found by measuring the pH of the solution using a pH meter or pH paper, and then using the following equation:

[H+] = 10^(-pH)

where [H+] is the concentration of hydrogen ions in moles per liter (M) and pH is the negative logarithm of the hydrogen ion concentration.

Alternatively, if you know the concentration of a strong acid or base in the solution, you can calculate the concentration of hydrogen ions using the concentration of the acid or base and the dissociation constant (Ka or Kb) for the acid or base. For example, for a strong acid, the concentration of hydrogen ions is equal to the concentration of the acid, while for a strong base, the concentration of hydroxide ions is equal to the concentration of the base.

The balanced chemical equation for the reaction between an acid, acetic acid and base, magnesium hydroxide leads to the production of Mg(CH₃COO)₂(aq) is :

2CH₃COOH(aq)  +   Mg(OH)₂(s)    ---->  Mg(CH₃COO)₂(aq)  +  2H₂O(l)

The reaction with the acid and base is below :

CH₃COOH(aq)  +   Mg(OH)₂(s)    ---->  Mg(CH₃COO)₂(aq)  +  H₂O(l)

acetic acid         magnesium                    magnesium           water

                           hydroxide                            acetate

                    reactant                 product

C                        2                               4

H                        6                               8

O                        4                               5

Mg                       1                               1

the reaction is not balanced the equation multiply by 2 in CH₃COOH and 2 in H₂O , we get

2CH₃COOH(aq)  +   Mg(OH)₂(s)    ---->  Mg(CH₃COO)₂(aq)  +  2H₂O(l)

This is the balanced chemical equation .

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Answer:

\(\displaystyle K_a = 4.24\times 10^{-10}\)

Explanation:

Write the base reaction of NaA with water:

\(\displaystyle \text{A}^-_\text{(aq)}+\text{H$_2$O}_\text{($\ell$)}\rightleftharpoons \text{HA}_\text{(aq)} + \text{OH}^-_\text{(aq)}\)

Hence, the equilibrium constant expression for the reaction is:
\(\displaystyle K_b = \frac{[\text{OH}^-][\text{HA}]}{[\text{A}^-]}\)

Thus, to find Ka, we can find Kb and use the fact that Ka × Kb = Kw.

From the reaction and initial concentration of NaA, create an ICE chart:

\(\begin{tabular}{llllll} & A^- &\text{H$_2$O} & \rightleftharpoons & HA & OH^- \\I & 0.563 M & \---- & & 0 M & 0 M \\C & -\text{ $ x$} & \---- & & +\text{ $x$ M} & + \text{$x$ M} \\E & \text{(0.563 - $x$) M} & \---- & & \text{$x$ M} & \text{$x$ M} \end{tabular}\)

Find [OH⁻] from the given pH:
\(\displaystyle \begin{aligned} \text{pH} +\text{pOH} & = 14.00 \\ \\ \text{pOH} & = 14.00 - \text{pH} \\ \\ & = 14.00 - (11.56) \\ \\ & = 2.44 \\ \\ -\log[\text{OH}^-] & = 2.44 \\ \\ [\text{OH}^-] &= 10^{-2.44} \\ \\ & =0.00363 \text{ M}= 3.63\times 10^{-3} \text{ M} = x\text{ M}\end{aligned}\)

Solve for all species concentrations at equilibrium from the found x value:

\(\displaystyle [\text{HA}] = [\text{OH}^-] = 3.63\times 10^{-3} \text{ M}\)

And:

\(\displaystyle \begin{aligned} \ [\text{A}^-] & = 0.563 - 3.63\times 10^{-3} \text{ M}\\ \\ & = 0.559\text{ M}\end{aligned}\)

Find Kb:

\(\displaystyle \begin{aligned} \displaystyle K_b &= \frac{[\text{OH}^-][\text{HA}]}{[\text{A}^-]} \\ \\ & = \frac{(3.63\times 10^{-3})(3.63\times 10^{-3})}{(0.559)}\\ \\ & = 2.36\times 10^{-5}\end{aligned}\)

Find Ka:

\(\displaystyle \begin{aligned} K_a\cdot K_b & = K_w \\ \\ K_a & = \frac{K_w}{K_b} \\ \\ & = \frac{(1.00 \times 10^{-14})}{(2.36\times 10^{-5})} \\ \\ &= 4.24\times 10^{-10} \end{aligned}\)

In conclusion:
\(\displaystyle K_a = 4.24\times 10^{-10}\)

A car travels at 32.1 km/hour. The velocity of car in m/sec is 8.92 m/s.

Velocity is defined as the pace at which an object's location changes in relation to a frame of reference and time.

It can also be defined as the directional speed of a moving item as an indication of its rate of position change as seen from a specific frame of reference.

As we know 1 km = 1000m

                     1 hour = 3600 sec

So, 32.1 km = 32100 m

Velocity = distance / time

Velocity = 32100 / 3600

Velocity = 8.92 m/sec.

Thus, a car travels at 32.1 km/hour. The velocity of car in m/sec is 8.92 m/s.  

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By the concept of calculating moles ,it can br concluded that the no. of atoms of phosphorus in 8.80mol of copper(II) phosphate is=1.06\(x10^{25}\)

A mole is defined as amount of substance containing as many as elementary entities that are there in atoms of exactly 12 g of carbon-12.Therefore we can say,1 mole of copper(II) phosphate, Cu3(PO4)2, contains three moles of copper(II) cations and two moles of phosphate anions.

Again 1mole of phosphate anions contains one mole of phosphorus and four moles of oxygen.Considering all these informations we can conclude that:1 mole of copper(II) phosphate contains 2 moles of Phosphorus

Accordingle the sample contains=(8.80\(x\)2) moles of Phosphorus

                                    =(17.6\(x\)Avogadro's constant) atoms of  Phosphorus

                                    =(17.6\(x\)6.022\(x\)\(10^{23}\)) atoms of  Phosphorus

                                    =1.06\(x10^{25}\) [approx] no. of Phosphorus atoms

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In 8.80 moles of copper(II) phosphate, there are approximately 1.06 x 10²⁵ atoms of phosphorus.

The number of atoms of phosphorus in a given amount of a compound can be calculated using the concept of mole in chemistry. Copper(II) phosphate is Cu3(PO4)2, containing 2 moles of phosphorus (P) for every 1 mole of the compound. Avogadro's number (6.022 x 10²³) gives the number of atoms in one mole.

So, if there are 8.80 moles of copper(II) phosphate, there would be 2 × 8.80 moles of phosphorus. Multiplying this by Avogadro's number gives the total number of phosphorus atoms.

Therefore, the number of phosphorus atoms is 2 × 8.80 × 6.022 x 10²³ = 1.06 x 10²⁵ atoms of phosphorus.

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Answer:

10 m/s

Explanation:

100 meters covered in 10 seconds, so:

100 m / 10 s = 10 m/s

Answer:

2969429th Ave

Explanation:

i dont know

Marie Curie was an eminent scientist who researched radioactivity. The atomic theory was deduced by the laws of Marie Curie's experiments.

The atomic theory is the arrangement of the subatomic particles and their properties. It describes the formation of a product in a chemical reaction and compounds.

The radioactive property of the elements described the indivisible property of the atomic model structure. The experiments and discovery of the thorium led to the arrangement of the atom.

It was deduced that radioactivity is independent of the atomic arrangement in a molecule but is dependent on the atoms themselves.

Therefore, atomic theory was formed from the law of Marie Curie's experiments.

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Easy!!

2+17=19

#hope that helps

Answer:

To find the answer you may

2+17=19

Explanation:

so that is the answer I'm sorry,to not give all the solutions

According to the VSEPR theory, a molecule or ion of CO2 will have a flat linear shape. Option A

In CO2, the carbon atom forms double bonds with each oxygen atom. The carbon-oxygen double bonds consist of two pairs of electrons, which are arranged linearly, leading to a linear molecular shape.

The VSEPR theory suggests that electron pairs in the valence shell of the central atom repel each other and try to position themselves as far apart as possible, resulting in the linear shape.

The VSEPR theory allows us to predict the molecular geometry based on the arrangement of bonding and non-bonding electron pairs around the central atom. In the case of CO2, there are no lone pairs of electrons on the carbon atom, and the molecule has a symmetrical arrangement, leading to a linear shape. Option A

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The total volume of HCl(aq) used in the titration was 9.50 mL, the total volume of NaOH(aq) used was 3.80 mL, and the molarity of the sodium hydroxide solution was 0.25 M.

To determine the total volume of HCl(aq) used in the titration, we subtract the initial buret reading from the final buret reading:

Total volume of HCl(aq) = final buret reading - initial buret reading

Total volume of HCl(aq) = 25.00 mL - 15.50 mL

Total volume of HCl(aq) = 9.50 mL

To determine the total volume of NaOH(aq) used in the titration, we use the same approach:

Total volume of NaOH(aq) = final buret reading - initial buret reading

Total volume of NaOH(aq) = 8.80 mL - 5.00 mL

Total volume of NaOH(aq) = 3.80 mL

To calculate the molarity of the sodium hydroxide solution, we use the following formula:

Molarity of NaOH(aq) = (Molarity of HCl(aq) * Volume of HCl(aq)) / Volume of NaOH(aq)

Substituting the given values, we get:

Molarity of NaOH(aq) = (0.10 M * 9.50 mL) / 3.80 mL

Molarity of NaOH(aq) = 0.25 M

Therefore, the molarity of the sodium hydroxide solution is 0.25 M.

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Answer:

In image :)

Explanation:

In image :)

while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

How to solve the problem?

The statement that is NOT true of zinc is "Grains are the most reliable food sources of zinc." While grains can be a source of zinc, they are not necessarily the most reliable source.

Zinc is an essential mineral that plays important roles in many biological processes, including immune function, protein synthesis, wound healing, and DNA synthesis. It is involved in various enzymatic reactions, and acts as a cofactor for many enzymes. Zinc is also important for proper growth and development, especially during childhood and adolescence.

Excess zinc intake can lead to decreased copper absorption, as both minerals compete for absorption in the intestines. This can lead to copper deficiency, which can cause anemia neutropenia, and other health problems. Therefore, it is important to maintain a balance between zinc and copper intake.

While grains can be a source of zinc, other foods such as meat, seafood, and dairy products are also good sources. Vegetarians and vegans may need to pay particular attention to their zinc intake, as plant-based sources of zinc may be less bioavailable than -based sources. Zinc supplements can also be used to prevent or treat deficiencies, but should be used with caution as excessive intake can have negative health effects.

In summary, while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

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The isoelectric point (pI) is the pH at which an amino acid or protein.

Functional groups of amino acids in enzymes present have the ability to readily ionize. other amino acids which have ionizable side chains. These include arginine, aspartic acid, cysteine, glutamic acid, histidine, lysine and tyrosine.

There are basically four different classes of amino acids determined by different side chains: (1) non-polar and neutral, (2) polar and neutral, (3) acidic and polar, (4) basic and polar. Principles of Polarity: The greater the electronegativity difference between atoms in a bond, the more polar the bond.

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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Answer:

17.04%

Explanation:

Actual Value = 173.1

Measured Value = 143.6

Percent error is obtained using the equation;

Percent error = (Measured - Actual) / Actual ]* 100

Percent error = [ (143.6 - 173.1) / 173.1 ] * 100

The absolute value of (Measured - Actual) is taken,

Percent Error = [29.5 / 173.1 ] * 100

Percent Error = 0.1704 * 100 = 17.04%

Answer:

14.9 mol

Explanation:

To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.

871 g × (1 mol / 58.44 g)

= 871/58.44 mol

≈ 14.9 mol

Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.

Answer:

See explanation

Explanation:

From the information given;

We convert the pressure from torr to atm as follows;

745 torr * 1 atm/760 torr = 0.98 atm

Initial pressure P1 =  0.98 atm - 0.0372 atm = 0.9428 atm

Initial volume V1=  283 mL

Initial temperature T1 = 28.0oC + 273 = 301 K

Final volume V2 = ??

Final Temperature T2 = 273 K

Final pressure P2 = 1 atm

From the general gas equation;

P1V1/T1 = P2V2/T2

P1V1T2 = P2V2T1

V2 = P1V1T2/P2T1

V2 = 0.9428 * 283 * 273/1 *  301

V2 = 241.99 mL or 0.24 L

If 1 mole of gas occupies 22.4 L

x moles of gas occupies 0.24 L

x =  1 mole  * 0.24 L/ 22.4 L

x = 0.0107 moles

But number of moles = mass/molar mass

molar mass = mass/number of moles

molar mass = 905 * 10^-3g/0.0107 moles

molar mass = 84 g/mol

The monoatomic gas is Krypton

The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

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Answer:

The structural formula for diethylamine is C4H11N

Explanation:

The percent composition of iron, carbon, and nitrogen in Prussian Blue is approximately 56.27%, 15.38%, and 28.35%, respectively. The exact percentage of hydrogen depends on the value of x in the formula.

When evaluating a chemical complex, knowing the percentage composition of a certain element inside it may be helpful. The formula for percent composition is 100 times the product of the element's mass and its molecular mass.

It is free of sulphur and phosphorus and contains 48% iron. Siderite-smithsonite, siderite-magnesite, and siderite-rhodochrosite are solid solutions formed when zinc, magnesium, and manganese are substituted for iron.

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Hydrogen quickly can not pressurized steel cylinders because" The low volumetric energy density of hydrogen makes storage a challenge. Since it would be the lightest and most basic element, it is even lighter that helium it is quickly lost in the environment."

A very minor hydrogen leak could occur if hydrogen interacts with the metal or passes completely through to the outside surface. Metal's mechanical characteristics deteriorate when hydrogen is present in the metal's lattice (e.g., fatigue as well as fracture resistance). Hydrogen embrittlement would be a phenomenon (HE).

Intensifying the density and adding additional gas to the tank are two effects of cooling compressed hydrogen gas. Liquid nitrogen was frequently used to chill the system down to 77 K, which triples its volumetric capacity when compared to uncooled hydrogen.

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Answer:

I would go with

B. Surface water at the poles is dense because of low temperatures and high salinity.

i could be wrong tho.

Explanation:

Answer:

Solid

Explanation:

Cus its solid, take a brick for example. It's hard and has no space unlike liquid or gas.

Explanation:

1/2*(13^2)*222=18759

Answer: THE ANSWER SHOULD BE Atomic number

Sry if wrong

Explanation:

Step 1 - Discovering the density of hexane in the new solution

We know the density is the mass divided by the volume:

To find the new density of hexane, i.e., the density of hexane in the mixture, we just have to divide its mass by the total volume of the solution. Let's divide it in two steps:

a) We will first calculate the mass of hexane that was add in the mixture. We'll use the density of pure hexane:

The density of pure hexane is 0.66 g/ml and the volume that was added is 411 ml. Therefore:

b) Now, we'll proceed to find the density of hexane in the mixture. We just have to divide its mass (271.26 g) by the total volume of the mixture:

The density will be thus:

Step 2 - Using the new density of hexane to calculate its volume percentage

Now that we have calculated the new density of hexane, we can find how much volume it occupies in the mixture. Let's divide the mass of hexane (271.26 g) by the new density: