write a net ionic equation for the reaction that occurs when aqueous solutions of nitric acid and ammonia are combined.

The symbol is the correct notation for the element silicon is Si. The atomic number of the silicon is 14. The correct option is a , b.

The silicon is a metalloid, that means it has properties of both the metals and the nonmetals. The Silicon is the second most abundant element on the Earth, after the oxygen, and it is the major component of the rocks, sand, and the minerals.

The Silicon has the crystalline structure and is vey hard, brittle, and the  blue-grey material. The silicon is not found in the pure form in the nature.

The atomic number of the silicon is 14. The symbol of the silicon is Si. Therefore, the a, b is correct option.

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Answer:

2 meters equal 200 centimeters

Explanation:

1 meter is equal to 100 centimeters.

Hope this helped, have a good day!

For a fence is 2 meters feet tall, the fence is 183.92 centimeters tall.

There are 0.3048 meters in 1 foot. So, a 2 meters fence is equal to 2 x 0.3048 = 0.6096 feet tall.

To convert feet to centimeters, multiply the number of feet by 30.48. So, a 0.6096 feet fence is equal to 0.6096 x 30.48 = 183.92 centimeters tall.

Therefore, the fence is 183.92 centimeters tall.

Feet to centimeters:

1 feet = 30.48 centimeters

0.6096 feet × 30.48 centimeters/feet

= 183.92 centimeters

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Answer:

B. changes in energy during the reaction

Explanation:

y-axis measures "energy" and x-axis measures "reaction progress". Those units fit well with (B) and not so well with concentration and time (A), phases and temperature (C), or reaction rate and time (D).

Answer:

b. changes in energy during reaction

Explanation:

graph

Answer: B

Explanation:

Answer:

b

Explanation:

Answer:  extremely sensitive to environmental changes caused by habitat destruction, climate change, pollution

Explanation:

Across the world, amphibians have been disappearing at an unprecedented rate — faster than any other group of animals. Frogs, toads, and salamanders are extremely sensitive to environmental changes caused by habitat destruction, climate change, pollution, and invasive species.

The Volume of 6.25 × \(10^{-4}\) ferroin solution is 0.4 ml.

To calculate dilution we use the formula,

                                 M1 × V1   =   M2 × V2    → 1

where,     M1, M2   =   molarity of the solutions

                 V1, V2   =   volume of the solutions  

As per the given question,

Substitute the values M1, M2, V1 and V2 in 1,

⇒      M1 × V1   =   M2 × V2

⇒      2.50 × \(10^{-5}\)  × 10   =     6.25 × \(10^{-4}\)  × V2

⇒      V2   =     2.50 × \(10^{-5}\)  × 10 / 6.25 × \(10^{-4}\)

⇒      V2   =    2.50 × \(10^{4}\) × 10 / 6.25 × \(10^{5}\)

⇒      V2   =    25 × \(10^{4}\) / 6.25 × \(10^{5}\)

⇒      V2   =    250000 / 625000

⇒      V2   =    0.4

Therefore, The volume of 6.25 × \(10^{-4}\) ferroin solution needs to be added to a 10ml volumetric flask in order to prepare a calibration solution with a concentration of 2.50 × \(10^{-5}\) is  0.4 ml.

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Answer:

X : 68 F

Y : 72 F

Explanation:

pls mark brainliest

Answer:The explanation is true

Directly proportional is like temperature and volume

V=kT  as Temp increases, volume increases

Inversely proportional is like pressure and volume

VP=k  as P increases, V decreases.

since wavelength time frequency is the speed of light,

wavelength and frequency are inversely proportional

lf=c

Explanation:

In electromagnetic waves, the frequency and wavelength are inversely proportional, which means if one gets larger, the other must get smaller. ...

Using the calculated molarity of the unknown acid, you can use the Rice table to determine the initial pH of the solution.


The rice table is a tool that is used to determine the unknown variables when calculating equilibrium concentrations. When titrating an unknown acid, the molarity of the solution is determined by using stoichiometric ratios. Once the molarity of the unknown acid is known, the Rice table can be used to determine the initial pH of the solution.

This is achieved by setting up a table that shows the initial concentration of each species, the change in concentration, and the equilibrium concentration. By using the equilibrium concentrations, it is possible to determine the equilibrium constant and calculate the pH of the solution.

In conclusion, if the initial pH determined using the Rice table matches the actual pH of the titration curve, it confirms that the calculation of the molarity was correct. If the pH values do not match, it is an indication of an error in the calculations, and a recalculation is necessary.

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The claim that vinyl gloves have a higher leak rate than latex gloves is supported by the study at a significance level of 0.005.

To determine if vinyl gloves have a higher leak rate than latex gloves, we can conduct a hypothesis test.

The z-value is calculated as:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions, and n₁ and n₂ are the sample sizes.

Certainly! Let's calculate the z-value to determine if vinyl gloves have a higher leak rate than latex gloves.

For vinyl gloves:

Sample size (n₁) = 240

Leaking gloves (x₁) = 0.63 * 240 = 151.2 (approximated to 151)

For latex gloves:

Sample size (n₂) = 240

Leaking gloves (x₂) = 0.07 * 240 = 16.8 (approximated to 17)

We will calculate the z-value using the formula:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions.

p₁ = x₁ / n₁ = 151 / 240 ≈ 0.629

p₂ = x₂ / n₂ = 17 / 240 ≈ 0.071

Calculating the z-value:

z = (0.629 - 0.071) / √((0.629 * (1 - 0.629) / 240) + (0.071 * (1 - 0.071) / 240))

z ≈ 13.239

The calculated z-value is approximately 13.239. To determine if the claim is supported, we compare this value to the critical z-value for a one-tailed test at a significance level of 0.005.

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The option that isn't a reason why the actual yield is less than theoretical yield is B. conservation of mass.

It should be noted that the formula for the percent yield is given as:

= Actual yield / Theoretical Yield × 100

Actual yield can be less than theoretical yield due to the presence of impure reactants ,competing side reactions, and loss of product during purification.

In conclusion, the correct option is B.

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The pressure obtained when the temperature is raised to 50 degrees celsius is 135.5 KPa

From the question given above, the following data were obtained:

The final pressure can be obtained as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

Since the volume is constant, we have:

P₁ / T₁ = P₂ / T₂

125 / 298 = P₂ / 323

Cross multiply

298 × P₂ = 125 × 323

Divide both side by 298

P₂ = (125 × 323) / 298

P₂ = 135.5 KPa

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There are total three laws of newtons, first law of newtons, second law of newton and third law of newton. Therefore, for every action there is an equal and opposite reaction.

Newton's first law is also called law of inertia. An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Third law of newton states  that for every action there is an equal and opposite reaction.

Therefore, for every action there is an equal and opposite reaction.

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The number of electrons present in the outermost shell is called valence electrons.

The number of electrons present in the last shell is called valence electrons. The atomic number of sodium is 11 and the atomic number of oxygen is 8.

There is 1 valence electron in sodium. The number of valence electrons in oxygen is 2.

The atomic number of iodine is 53. The number of the valence electron in iodine is 1. The atomic number of calcium is 20. The valence electron in calcium is 2.

Therefore, The number of electrons present in the outermost shell is called valence electrons.

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The carbonyl group in a ketone is bonded to two hydrogen atoms. In a ketone, the carbonyl group consists of a carbon atom double-bonded to an oxygen atom (C=O).

The remaining two valence electrons of the carbon atom are occupied by two other substituents or groups. These can be alkyl or aryl groups, and they can be the same or different. The carbonyl group in a ketone is not directly bonded to any hydrogen atoms. It consists of a carbon atom double-bonded to an oxygen atom (C=O) with two other substituents or groups attached to the carbon atom. These substituents can be alkyl or aryl groups. Therefore, the correct answer is that the carbonyl group in a ketone is bonded to zero hydrogen atoms.

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Number of moles of NaCl are present in aqueous solution is 0.0139 moles.

We create a solution for a lab,

Weight of NaCl = 0.81 g

Nacl is dissolved in water to form an aqueous solution.

The volume of the resulting aqueous NaCl solution = 12. 2 ml

The molar mass of NaCl is 58. 443 g/mol.

Now, we need to calculate the number of moles of NaCl in aqueous solution.

The relation between number of moles , given mass and molecular mass is given below:

number of mole = ( given mass / molecular mass )

number of moles of NaCl = ( 0.81/58.443 )

number of moles of NaCl = 0.0139

Thus, we can conclude that 0.0139 moles of NaCl are present in aqueous solution.

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a hearing aid.

it doesn't get in contact with fluids (like contact lenses) and doesn't get implanted, so it got not much to do with the immune system

Answer:

hearing aid

Explanation:

i just took tha test

This is a substitution reaction

Answer:

The answer should be Ionic

Explanation:

prove me wrong

A molecule with strong intermolecular forces will have a weak or low vapor pressure.

Molecules generally with a high intermolecular force of attraction will have a low vapor pressure. This is because since the force of attraction between molecules is high as they are tightly packed, only fewer molecules will get a chance to move with kinetic energy at a given temperature.

Whereas, molecules with weak intermolecular force can travel easily and escape and so will have a greater vapor pressure. But it is not the case with strong intermolecular forces. Molecules with high vapor pressure are called volatile. Therefore, the molecules with strong intermolecular forces will have a low vapor pressure, and only that is expected to happen in such cases.

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Answer:

anyone know the answers

Explanation:

The strongest reducing agent among the given options is "Y(s)" (yttrium in its elemental form). Yttrium is a metal and metals tend to readily lose electrons, making them excellent reducing agents.

Let's consider the other options:

a. HF(s) (hydrogen fluoride) is not a strong reducing agent as fluorine has a high electronegativity and tends to gain electrons rather than donate them.

c. Y3+ (yttrium ion) is an oxidized form of yttrium and does not have the ability to readily donate electrons, making it a weaker reducing agent compared to elemental yttrium.

d. CO(s) (carbon monoxide) is a reducing agent but not as strong as yttrium because carbon has a moderate tendency to donate electrons.

e. CO2 (carbon dioxide) is not a reducing agent as carbon is in its highest oxidation state (+4) and does not readily donate electrons.

f. Ir(s) (iridium) is a metal but not as strong a reducing agent as yttrium. Its ability to donate electrons is lower due to its higher electronegativity compared to yttrium.

g. HF4 (tetrafluorohydrazine) is not a strong reducing agent as it contains highly electronegative fluorine atoms.

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The pH of a 3.97x10^-2 m aqueous solution of hx if its ka is equal to 3.0x10^-3 is 1.96.

pH is defined as the concentration of hydrogen ion in the solution.

Given,

Ka = 3.0x10^-3

As we know that,

Ka =( [H+] [X-])/[HX]

Let the concentration of [H+] = [X-] = x at any time t.

At the same time, concentration of [HX] = (0.0397-x)

Ka = x^2/(0.0397-x)

3.0x10^-3 = x^2/(0.0397-x)

x^2 = 0.1191 × 10^-3

x = 1.09×10^(-2)

x = 0.0109

The concentration of [H+] = 0.0109.

As we know that,

pH = -log[H+]

pH = -log(0.0109)

pH = -(-1.96)

pH = 1.96

Thus, we calculated that the value of pH of a 3.97x10^-2 m aqueous solution of hx if its ka is equal to 3.0x10^-3 is 1.96.

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Answer:D

Explanation:I think

Answer: There are two elements actually and those elements are Carbon and Silicon

Explanation:Plz mark brainliest if im right

The development of positive charge on carbon rod and negative charge on zinc causes development of voltage difference.

The voltage difference in any electrochemical reaction arises due to difference in charges on each side, which is further ascertained by the presence of electrons. Here we see that carbon rod becomes positively charged on flow of electrons while zinc rod becomes negatively charged.

The dry cell here indicates lack of acid in the cell. However, the replaced liquid here is moist electrolyte. Now the deposition of charged on each side on further connection with leads from outer side results in flow of electron and hence current is generated.

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Answer:

106.785 kPa, I believe this is correct!

Explanation:

Answer:

1,2,3,4,8,9,10,12,14,15 and 16

Explanation:

Coz they have different kinds (colours) of atoms

The rest are pure substances,

I'm not so sure though, double check after this