The volume of a candy bar is 55cm^ ^ 3 . The mass of the candy bar is 70g. What is the density of the candy bar in g/cm^ ^ 3 * 2.3 0.8 3850 1.3

Hence, the volume of the solution after the addition of NaOH is 0.1373 L and pH is 0.734

Titration is a chemical technique used to determine the concentration of a solution with an unknown concentration by reacting it with a solution of known concentration. The endpoint of the titration is usually determined by a change in the color of the indicator or by measuring the pH of the solution.

Calculation of pH

The balanced equation for the reaction between HNO3 and NaOH is:HNO3 + NaOH → NaNO3 + H2O

First, we need to determine the amount of HNO3 that reacts with the added NaOH:

0.100 M HNO3 × 0.100 L = 0.0100 moles

HNO31 L 1 M0.200 M

NaOH × 0.0373 L = 0.00746 moles

NaOH1 L 1 M

From the balanced equation, we know that one mole of HNO3 reacts with one mole of NaOH. Since we have used 0.00746 moles of NaOH, an equal amount of HNO3 has been neutralized.

Therefore, the remaining amount of HNO3 is:

0.0100 – 0.00746 = 0.00254 moles HNO3

Since 0.100 M HNO3 was used initially and the volume of the solution remains constant at 100.0 mL, the concentration of HNO3 after the addition of NaOH is:

0.00254 moles HNO3 = 0.0254 M HNO3100.0 mL

The NaOH that was added reacts with the remaining HNO3 to produce water.

The amount of water produced is:0.00746 moles NaOH × (1 mole H2O/1 mole NaOH) = 0.00746 moles H2O

The volume of the solution after the addition of NaOH is:

100.0 mL + 37.3 mL = 137.3 mL

= 0.1373 L

Therefore, the concentration of H+ is:

0.0254 moles H+ = 0.1846 M0.1373 L

Now we can calculate the pH:

pH = -log [H+]

pH = -log (0.1846)

pH = 0.734

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Activated carbon is commonly added to a sample during the recrystallization process to absorb impurities present in the sample or in the solvent used for recrystallization. This is because activated carbon has a high surface area and can adsorb a wide range of organic and inorganic impurities.

Activated carbon, also known as activated charcoal, is a highly porous form of carbon processed to have a large surface area per unit volume. The activation process involves exposing carbon to high temperatures and an oxidizing agent.

Activated carbon is also used in medical applications, such as in emergency treatments for poisoning or drug overdoses, as it can bind to certain toxins and chemicals and help prevent them from being absorbed by the body.

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You can use the scientific method everyday by asking questions and doing experiments. For example, you want to know how a fire starts, so you do an experiment with it!

10.63 grams of ZnO remain after the reaction is complete.

The balanced chemical equation for the reaction between zinc oxide and water is:

ZnO(s) + H2O(l) → Zn(OH)2(aq)

No. of moles of ZnO = Mass of ZnO / Molar mass of ZnO= 35.0 g / 65.38 g/mol= 0.535 moles of ZnO

The amount of water is given as 6.85 g

The molar mass of water is:H2O = 18.02 g/mol

No. of moles of H2O = Mass of H2O / Molar mass of H2O= 6.85 g / 18.02 g/mol= 0.380 moles of H2O

Now, we need to find out the limiting reagent.

.No. of moles of Zn(OH)2 formed from 0.535 moles of ZnO = 0.535 molesNo. of moles of Zn(OH)2 formed from 0.380 moles of H2O = 0.380 moles

Therefore, since the amount of ZnO (0.535 moles) is greater than the amount of H2O (0.380 moles), H2O is the limiting reagent and ZnO is the excess reagent.

The maximum amount of Zn(OH)2 that can be formed is given by the amount of ZnO that reacts with H2O, which is 0.380 moles.

No. of grams of Zn(OH)2 = No. of moles of Zn(OH)2 × Molar mass of Zn(OH)2= 0.380 mol × (97.41 g/mol)= 37.08 gThe formula for the limiting reagent is H2O. The amount of excess reagent remaining after the reaction is complete can be calculated by subtracting the amount of limiting reagent used from the initial amount of excess reagent

.Initial amount of excess reagent (ZnO) = 35.0 g

No. of moles of ZnO = Mass of ZnO / Molar mass of ZnO= 35.0 g / 65.38 g/mol= 0.535 moles of ZnO

Amount of ZnO used in the reaction = No. of moles of Zn(OH)2 formed × Ratio of ZnO to Zn(OH)2= 0.380 mol × (1 mol ZnO / 1 mol Zn(OH)2)= 0.380 moles of ZnO used

Amount of ZnO remaining after the reaction = Initial amount of ZnO − Amount of ZnO used= 35.0 g − (0.380 mol × 65.38 g/mol)= 10.63 g

Therefore, 10.63 grams of ZnO remain after the reaction is complete.

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Answer:

A is the symbol of mass number.

Explanation:

→ Mass number (A) = Protons + Neutrons

It is the required formula. The symbol of the mass number is A.

Answer:

The letter A

Explanation:

Answer:

The correct answer is C. 10

Explanation:

subtracting the atomic number from the mass number gives the number of neutrons in an element.

Answer:

Ca(NO3)2 + 2 NaCl = 2 NaNO3 + CaCl2

Explanation:

On the left you have an original balance of Ca - 1, N - 2, O - 6, Na - 1, and Cl - 2, and on the right you have a balance of Ca - 1, N - 1, O - 3, Na - 1, Cl - 2.

Ca - 1 Ca - 1

N - 2 N - 1

O - 6 O - 3

Na - 1 Na - 1

Cl - 1 Cl - 2

In order to balance these, you'll have to make both sides equal. To get the N on the right to be equal to the N on the left, you'll have to multiply NaNO3 by 2, thus making it 2NaNO3. By doing this, you will offset the balance of both Na and O.

Ca - 1 Ca - 1

N - 2 N - 2

O - 6 O - 6

Na - 1 Na - 2

Cl - 1 Cl - 2

To balance the rest of the equation, you'll have to multiply both Na and Cl by 2. This will change NaCl to 2NaCl, making the balance look like this:

Ca - 1 Ca - 1

N - 2 N - 2

O - 6 O - 6

Na - 2 Na - 2

Cl - 2 Cl - 2

You will now be left with your final equation Ca(NO3)2 + 2 NaCl = 2 NaNO3 + CaCl2.

Answer:

Properties of transition elements

they are all metals and that most of them are hard, strong, and lustrous, have high melting and boiling points, and are good conductors of heat and electricity.

Answer:

to provide food to the plant also known as glucose

Answer:

D. Because they lose electrons

Explanation:

In neutral state the numbers of proton (+) = numbers of electrons (-)

if there are less electrons, there will be more protons than electrons => positive charge

if there are more electrons, there will be more electrons than protons => negative charge

Answer:

Yup, I believe so.

Explanation:

Answer:

Energy costs are high for many school districts. Therefore, unlimited free power generated by the sun can deliver huge cost savings when compared to grid-generated power. With a modestly sized solar array, cost savings are alike modest.

Explanation:

Answer:

d. pOH = 12 => pH = 14 - 10 = 2 => most acidic

Explanation:

pH = -log[H⁺] => [H⁺] = 10^-pH

By definition, if ...

[H⁺] > 10⁻⁷ > [OH⁻] => pH < -log(10⁻⁷) < 7 => pOH > 14 - 7 > 7 => acidic solution

[H⁺] = 10⁻⁷ = [OH⁻]  => pH = -log(10⁻⁷) = 7 => pOH = 14 - 7 = 7 => neutral solution

[H⁺] < 10⁻⁷ < [OH⁻]  => pH > -log(10⁻⁷) > 7 => pOH < 14 - 7 < 7 => basic solution

∴ From most basic to most acidic ...

a. pH = 12 => most basic

b. pOH = 5 => pH = 14 - 5 = 9

c. [H⁺] = 1 x 10⁻⁸ => pH = -log(10⁻⁸) = -(-8) = 8

d. pOH = 12 => pH = 14 - 10 = 2 => most acidic

Excited electrons that revert to the ground state result in atomic emission spectra.

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Taking into account the definition of molarity,  the molarity of a solution made up of 15.5 mol of ammonium sulfate dissolved in enough water to make 45 liters of solution is 0.34 moles/L.

The molar concentration is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species and indicates the number of moles of solute contained in one liter of solution.

The molarity of a solution is calculated by:

molarity= number of moles÷ volume

Molarity is expressed in units moles/L.

In this case, you have:

Replacing in the definition of molarity:

molarity= 15.5 moles÷ 45 L

Solving:

molarity= 0.34 moles/L

Finally, the molarity of the solution is 0.34 moles/L.

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The general formula for an aldehyde is CnH2n+1CHO or CnH2nO.

An aldehyde is an organic chemical that contains a functional group with the formula RCH=O. The functional group (without the "R" side chain) is an aldehyde, however it can also be categorized as a formyl group. Aldehydes are widely used and serve vital roles in industry and biology.

Aldehydes have a carbon center that is linked to oxygen by a double bond, hydrogen by a single bond, and a third substituent, which is carbon or, in the case of formaldehyde, hydrogen by a single bond. The middle carbon is frequently described as sp2-hybridized. The aldehyde group is polar in several ways. The length of the C=O bond is around 120-122 picometers.

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Answer:

Both the proton and electron have one quantum unit of charge.

Explanation:

The particle that has exactly one quantum unit of charge is the electron.

The charge of an electron is -1.602 x 10^-19 Coulombs, which is considered one quantum unit of charge. The charge on an object can be measured in Coulombs and is related to the number of electrons or protons that are present. The electron is a fundamental subatomic particle that is found in all atoms and has a negative charge. It plays an important role in many chemical and physical processes, including electricity, magnetism, and the formation of chemical bonds.

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Answer:

This is a single replacement reaction because I replaces Br.

Answer: This reaction can'toccur

Explanation

Iodine can't displace Bromine from its compound been less reactive than Br

The density of the coin, given the data from the question is 21.33 g/mL.

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

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

Density = mass / volume

Density = 48000 / 2250

Density = 21.33 g/mL

The density of the coin obtained, given the data from the question is 21.33 g/mL

Considering the options given, the density of the metal is not specified.

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Answer:

protons and neutrons

Explanation:

Neutrons and protons are the particles that are found in the nucleus of an atom.

Protons and neutrons are subatomic particles. They are present in the nucleus of an atom and constitute most of the mass of the atom. There are three kinds of subatomic particles that are present in an atom.

These are -

Since most of the mass of the atom, in the form of protons and neutrons, is present in the nucleus, the mass number is denoted as the sum of the number of protons and neutrons. Protons and neutrons together are sometimes also called nucleons.

Therefore, neutrons and protons are present in the nucleus of an atom.

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When a can of coke is removed from the fridge and then warmed up to room temperature, the entropy of the beverage will increase.

We can define entropy as the disorderness of a system or the randomness of a particular system. The entropy of a system changes with a change in the temperature of the system.

As the temperature increases, the entropy of the system also increases and when the temperature is reduced, the entropy of the system also decreases. When a can of coke is kept in fridge, the entropy decreases as the temperature gets decreased.

As the can of the coke is taken out and warmed up to room temperature, the entropy increases with the increase in temperature as the randomness of the molecules increases.

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The percentage composition  of water in a hydrate of BaCl₂ is 14 %.

Percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates solute to solvent as,mass of element/mass of compound ×100.

It provides quantitative information about the compound and helps in it's analysis.

Percent composition helps in elemental analysis in compound .In the given compound, mass= 5 g and mass of anhydrous salt= 4.3 g , mass of water=5-4.3=0.7 g .

Therefore, percent composition is, 0.7/5×100=14 %.

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Answer:

Explanation:

To obtain pure crystals of iron sulfate from a mixture of copper carbonate and iron sulfate, you can use the process of filtration and crystallization. Here are the steps to follow:

Dissolve the mixture of copper carbonate and iron sulfate in water to form a solution.

Add dilute sulfuric acid to the solution, which will react with copper carbonate to form copper sulfate, carbon dioxide, and water. The iron sulfate will remain in the solution.

CuCO3 + H2SO4 -> CuSO4 + CO2 + H2O

Filter the solution to separate the solid copper sulfate from the iron sulfate solution.

Heat the iron sulfate solution to evaporate the water, leaving behind a concentrated solution of iron sulfate.

Allow the concentrated solution to cool slowly to room temperature to allow crystals of pure iron sulfate to form.

Filter the crystalized iron sulfate to separate it from any remaining solution.

Wash the crystals with distilled water to remove any impurities and allow them to dry.

By following these steps, you can obtain pure crystals of iron sulfate from a mixture of copper carbonate and iron sulfate.

Answer:

20 degrees Celsius

Explanation:

Answer: Connective tissue binds various tissue together and form structural framework for the body Areolar connective tissue serves as a support framework for epithelium Adipose connective tissue store energy as fat, conserve body heat, fills space in the body pads and guards many organs and shape up the body.

Explanation:

TD Ameritrade is an example of a brokerage firm, which is a type of nondepository financial institution.

Brokerage firms provide services that allow individuals and institutions to buy and sell financial assets such as stocks, bonds, mutual funds, and other securities. TD Ameritrade is one of the largest brokerage firms in the United States, with a range of services that includes online trading platforms, investment research tools, and financial advisors who can offer guidance on investment decisions. As a brokerage firm, TD Ameritrade does not take deposits from customers like a traditional bank, but it does hold and manage customer assets. Overall, brokerage firms like TD Ameritrade play an important role in the financial industry by providing investors with access to a wide range of investment options and helping them to manage their portfolios effectively.

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The total mass of 4 tin is in grams is 580 grams and in kg is 0.58kg.

One tin of chopped tomatoes weight is 145 grams

and we have to calculate it for 4

so for 4

145*4 =580 grams

and we have to change it into kilograms so

580 /1000  = .58kg

By 1,000, divide the number of grams.

To convert from grams to kilograms, simply divide by 1,000 because there are 1,000 grams in every kilogram. If necessary, construct the equation using fractions. Put the number of grams over 1 and divide it by the conversion factor, which is 1 kg / 1,000 g. Your answer in kilograms will result from the cancellation of the grams. Remember to use the appropriate units to mark your response.

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The pH of a solution containing 0.195 M HC2H3O2 and 0.115 M KC2H3O2 is 4.41, while the pH of a solution containing 0.245 M CH3NH2 and 0.135 M CH3NH3Br is 10.34.

A) The pKa of HC2H3O2 is 4.76. Using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the acetate ion (C2H3O2-) and [HA] is the concentration of acetic acid (HC2H3O2).

pH = 4.76 + log(0.115/0.195) = 4.76 - 0.351 = 4.41

Therefore, the pH of the solution is approximately 4.41.

B) The pKa of CH3NH3+ is 10.70. Using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the methylamine ion (CH3NH2) and [HA] is the concentration of methylammonium ion (CH3NH3+).

pH = 10.70 + log(0.135/0.245) = 10.70 - 0.362 = 10.34

Therefore, the pH of the solution is approximately 10.34.

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