4 5 Is water an acid, alkali or neutral? Give the reason for your answer.​

The caloric content of the banana in nutritional calories per gram is :

934.4 cal/g

Given data :

mass of banana ( Mb ) = 3.05 g

mass of water ( Mw )= 500 g

change in temperature ( ΔT ) = 5.7°c

Cw =  1.00 cal/g･°c.

First step : calculate heat released

Qw = Mw* Cw * ΔT

      = 500 * 1 * 5.7

      = 2850 cal

Next step : Calculate the caloric content of the banana

caloric content = Qw / Mb

                         = 2850 cal / 3.05 g

                         = 934.4 cal/g

Hence we can conclude that The caloric content of the banana in nutritional calories per gram is : 934.4 cal/g

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Answer:

music amplifier or a loudspeaker

Explanation:

A music amplifier or a loudspeaker are a few devices that convert electrical energy into sound energy.

As it is a well known fact that energy can neither be created nor be destroyed it can only change from one form to the other. As here it is changing from electrical to sound.

The first step in this calculation is to know how many liters is equal to 1 gallon, and the value is 3.785 liters, so now we have to make the following calculation:

1 gal = 3.785 Liters

30.0 gal = x Liters

x = 3.785 * 30.0

x = 114 Liters

Choose the products that complete the reaction. The chemical equation may not be balanced.

NaHCO3 + HC2H3O2

Answer: NaC2H3O2 + CO2 + H2O

Answer: Moles are found in a 350.mL solution of 13.5M \(HNO_{3}\) are 4.725 mol.

Explanation:

Given: Volume = 350 mL (1 mL = 0.001 L) = 0.350 L

Molarity = 13.5 M

Molarity is the number of moles of a substance present in a liter of solution.

Therefore, moles of \(HNO_{3}\) present in the given solution are calculated as follows.

\(Molarity = \frac{moles}{Volume (in L)}\\13.5 M = \frac{moles}{0.350 L}\\moles = 4.725 mol\)

Thus, we can conclude that moles found in a 350.mL solution of 13.5M \(HNO_{3}\) are 4.725 mol.

Answer:

false

Explanation:

salt water cannot be classified as a substance because it's composition can vary

Answer: Yes F is also correct.

Explanation:

Answer: Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. The anode (positive electrode ) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode.

The equilibrium to shift as in direction where the drop in concentration of occurs if the concentration of \(Co_{2}\)is raised on the product side. As a result, the equilibrium will move to the left.

what is equilibrium?

During a reversible chemical process, chemical equilibrium is the state in which there is no net change in the quantity of reactants or products. The moment the products are produced in a reversible chemical reaction, they begin to interact with the initial reactants.

When the two opposing reactions are in equilibrium, there is no net change in the amount of the chemicals involved since they are taking place at the same rates, or velocities.

However at time, the reaction may be deemed to have finished, meaning that the maximum amount of reactants to products has been converted under the given reaction conditions.

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The correct question is :

Consider the following reversible, exothermic chemical reaction: 2C2H2(g) + 5O2(g) ↔4CO2(g) + 2H2O(g)

All BUT one of the conditions will cause equilibrium to shift right and produce more of the products. Which change will cause the reaction to shift to the left?

A) adding oxygen

B) adding CO2

C) increasing the pressure

D) decreasing the temperature

Answer:

1, 2, 2, 1

Explanation:

This is basically the equation we're trying to balance:

Cu + AgNO₃ → Ag + Cu(NO₃)₂

We start with Copper (Cu): There is 1 atom on the reactants'(left) side and 1 atom on the products'(right) side which means it's balanced

The second is Silver (Ag): There is 1 atom on the reactants' side and 1 atom on the products' side which means it's balanced

The third is Nitrogen (N) and there is 1 atom on the reactants' side and 2 atoms on the products' side. We balance it by multiplying the reactants' side by 2

Cu + 2AgNO₃ → Ag + Cu(NO₃)₂

Silver is now imbalanced so we multiply the silver atoms on the product's side by 2

Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂

If you count them now, the atoms on each side are the same number

1 Copper atom on each side

2 Silver atoms on each side

2 Nitrogen atoms on each side

6 Oxygen atoms on each side (2 sets of 3 oxygen atoms)

1Cu + 2AgNO₃ → 2Ag + 1Cu(NO₃)₂

The pH of the solution made by combining 150 mL of 1.1 M acetic acid and 175 mL of 0.6 M sodium acetate is approximately 4.76.

To determine the pH of the solution, we need to consider the acid-base equilibrium of the acetic acid (CH₃COOH) and its conjugate base, acetate ion (CH₃COO⁻). The pKa of acetate is given as 4.76, which corresponds to the pH at which the concentration of acetic acid and acetate ion is equal.

The initial concentrations and volumes, we can calculate the moles of acetic acid and sodium acetate. The total volume of the solution is 150 mL + 175 mL = 325 mL.

Moles of acetic acid = 1.1 M * (150 mL / 1000 mL) = 0.165 mol

Moles of sodium acetate = 0.6 M * (175 mL / 1000 mL) = 0.105 mol

Since acetic acid and sodium acetate react to form a buffer solution, the moles of the conjugate base (acetate ion) and the weak acid (acetic acid) should be in a ratio determined by the Henderson-Hasselbalch equation:

pH = pKa + log([acetate ion] / [acetic acid])

By substituting the given pKa value (4.76) and the moles of acetate ion (0.105 mol) and acetic acid (0.165 mol), we can solve for pH. The resulting pH is approximately 4.76.

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The pH of a solution made by combining 150 ml of 1.1 M acetic acid and 175 ml of 0.6 M sodium acetate is 4.56. This is calculated using the Henderson-Hasselbalch equation.

In this question, we are dealing with a buffer solution composed of acetic acid and its conjugate base, acetate. To solve this, we use the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]), where [A-] is the molar concentration of the base (sodium acetate) and [HA] is the molar concentration of the acid (acetic acid).

First, calculate the molar concentration of each component. For acetic acid: (1.1 mol/L) * (150 ml / 1000 ml/L) = 0.165 mol. For sodium acetate: (0.6 mol/L) * (175 ml / 1000 ml / L) = 0.105 mol.

Next, find the total volume of the solution: 150 ml + 175 ml = 325 ml or 0.325 L. Thus, the molar concentration of acetic acid is 0.165 mol / 0.325 L = 0.5077 M and the molar concentration of sodium acetate is 0.105 mol / 0.325 L = 0.3231 M.

Then, substitute those values into the Henderson-Hasselbalch equation: pH = 4.76 + log(0.3231 / 0.5077) = 4.76 - 0.20 = 4.56.

Therefore, the pH of the solution is 4.56.

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Answer:

Ionization energy increases as you go across a period, and increases as you move up a group. So, elements with the smallest ionization energy would be at the bottom left corner of the periodic table. Examples of elements with small ionization energy: Francium (Fr), Cesium (Cs), Radium (Ra).

Answer:

The second company job of $18 /hr is the better deal

Explanation:

We are told that;

-First job offers a salary of $30,000/yr

-Second job offers a salary of $18/hr.

Now, let's convert the salary of the second job to amount per year.

We are told that full-time work is 49hr/wk, 52 wk/yr.

Since we have 49 hrs in a week, then amount per week = 18 × 49 = $882 per week

Then amount per year = 882 × 52 = $45864 /yr

Thus, the second job pays $45864 /yr.

This is more than the first job. Thus, the second job is the better deal

Answer:

Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they're ... Group A is given the special juice to drink while they work. Group ... 1. Control Group. Group B. 2. Independent Variable. volume of special juice.

Explanation:

Answer:

1. Group B

2. The juice

3. The number of stacks of paper

4. the juice did not help improve a quicker process

5. Group A can be given the juice, Group B can be given the juice without the special ingredient

USE QUIZLET FLASH CARDS IT CAN HELP YOU WITH A LOT OF QUESTION

The dye concentration in the original solution can be calculated using the following equation:

C1V1 = C2V2

Where:

C1 = Initial dye concentration V1 = Initial volume (100.00 mL) C2 = Final dye concentration (0.000158 M) V2 = Final volume (100.00 mL)

Therefore, C1 = 0.000158 x 100.00/2.00 = 0.0079 M.

So, the dye concentration in the original solution was 0.0079 M.

It is important to note that when diluting a solution, the number of moles of solute (the substance being dissolved) remains constant. This means that the amount of solute in the initial solution is equal to the amount of solute in the final diluted solution, which is why the equation works in the way it does.

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Acetylcholinesterase equilibrium equation is Ag2CO3(s) <---> 2 Ag+(aq) + CO32-(aq)

Following the transmission of information between two nerve cells or neurons, the neurotransmitter acetylcholine is hydrolyzed by the enzyme acetylcholine esterase. Choline and acetate result from the breakdown of acetylcholine (also called acetic acid). Acetate will permeate the presynaptic cell's membrane and choline will travel through it to allow for the reuse of the components.

In order for a muscle cell to contract, acetylcholine transmits a signal from a nerve cell to its receptors. A breakdown of the acetylcholine is then performed to prevent misunderstanding with brand-new neurotransmitters.

Due to their potent acetylcholinesterase inhibitory properties (see parasympathomimetic), many nerve agents and neurotoxins have the ability to constantly induce the contraction of muscle cells. This can cause death when consumed in big numbers.

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Answer:

Silver (Ag)

Explanation:

The electronic configuration of copper is shown below;

[Kr]4d10 5s1

We can see that there is only one 5s1 electron. Hence Ag^+ tends to display a pseudo noble gas configuration. This pseudo noble gas configuration explains why silver is prevalent in the +1 oxidation state.

The other transition metals have many stable oxidation states found in nature. Chromium is observed both in +3 and +6 oxidation states. Iron is found in +2 and +3 oxidation states and copper is mostly stable in the +2 oxidation state since the +1 oxidation state readily disproportionate.

Hence silver tends to have only a single ionic charge for reasons aptly stated above.

Yes, the physical properties of hydrogenated and partially hydrogenated oils are different.

Here are the differences that occur between them:-

Fully Hydrogenated Oils-

1.) Hydrogenated Oil is an oil in which all C=C bonds have been reduced.

2.) Oil returns to "zero trans fat" levels.

3.) Fully hydrogenated oils are probably healthier than partially hydrogenated oils because they contain no trans fats.

Partially Hydrogenated Oils -

1.) Partially hydrogenated oils have some an oil in which the C bonds have not been altered.

2.) Partial hydrogenation produces trans fats.

3.) Partially hydrogenated oils or trans fats are not food safe.

Yes, fully hydrogenated vegetable oils are more or less healthy or ineffective. Harmful forms of saturated fatty acids. Fully hydrogenated oils are solid, similar to the saturated fats found in meat. Fully hydrogenated oils are probably better than partially hydrogenated oils because they contain no trans fats.

It is hard to say that it is good for your health.

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Using the balancing equation and molar mass conversion, the theoretical yield of acetaminophen from 3.00 g of 4-aminophenol is determined to be 4.16 g.

Acetic acid and acetaminophen are produced when 4-aminophenol and acetic anhydride combine. C6H4(NH2)(OH) + (CH3CO)2O = C8H9NO2 + CH3COOH is the reaction's balanced chemical equation.

4-aminophenol has a 1:1 molar ratio with acetaminophen. Hence, by first translating the mass of 4-aminophenol to moles and then using the molar mass of acetaminophen to convert back to grammes, one may compute the potential yield of acetaminophen.

3.00 g / 109.13 g/mol = 0.0275 mol is the number of moles of 4-aminophenol.

Acetaminophen's theoretical yield is equal to 0.0275 mol multiplied by 151.16 g/mol, or 4.16 g.

Acetaminophen thus has a theoretical yield of 4.16 g.

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Explanation:

Chemical weathering is most effective when water is present.

Answer:

if you add or subtract a neutron from an atom it will become a new isotopes of the same element

Answer:

When you add a neutron to an atom you create a new isotope of the same element you had begun with. Neutrons do not carry an electric charge so it doesn't change the charge.

Explanation:

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, by transferring electron or sharing electrons,  particles combine to form the variety of matter.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. By transferring electron or sharing electrons,  particles combine to form the variety of matter.

Therefore, by transferring electron or sharing electrons,  particles combine to form the variety of matter.

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The boiling point of the solution composed of 15.0 g of urea in 0.500 kg of water is approximately 100.25 °C.

To determine the boiling point of the solution, we need to calculate the change in boiling point caused by the addition of urea.

First, let's calculate the molality (m) of the urea solution:

m = moles of solute / mass of solvent (in kg)

moles of urea = mass of urea / molar mass of urea

= 15.0 g / 60.6 g/mol

= 0.247 moles

mass of water = 0.500 kg

m = 0.247 moles / 0.500 kg

m = 0.494 mol/kg

Next, we can calculate the change in boiling point (ΔTb) using the equation:

ΔTb = kbp x m

ΔTb = 0.5121 °C/m x 0.494 mol/kg

ΔTb = 0.2529 °C

Finally, we can determine the boiling point of the solution:

Boiling point of solution = Boiling point of water + ΔTb

Boiling point of solution = 100.00 °C + 0.2529 °C

Boiling point of solution ≈ 100.25 °C

Therefore, the boiling point of the solution composed of 15.0 g of urea in 0.500 kg of water is approximately 100.25 °C.

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When the arrangement of atoms changes in a substance, the properties of the substance can change as well. The different arrangements of atoms can lead to different chemical and physical properties.

For example, if the atoms of a substance are rearranged to form a new compound, the new compound will have different chemical properties than the original substance. A new compound may have a different color, odor, reactivity, or melting point than the original substance.

Changing the arrangement of atoms without changing the chemical composition can change the physical properties. For example, a crystalline solid has atoms or molecules arranged in a regular, repeating pattern. This arrangement gives the material unique properties such as density, melting point, and hardness. If the arrangement of atoms and molecules changes, the properties of solids can also change.

In summary, when the arrangement of atoms in a substance changes, the properties of the substance can also change. Different arrangements of atoms have different chemical and physical properties.

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Answer:

the reasons for the changes in seasons are: revolution of the Earth

The tilt of the Earth's axis

Answer:

violet

Explanation:

Answer:

V = 250 cm3

= 250 × 10^(-3) dm3

= 1/4 dm3

no. of mole = 0.2×1/4 mol

= 0.05 molExplanation:

Total , 0.050 moles of sodium chloride (NaCl) is required to prepare 250 cm³ of a 0.200 mol/dm³ solution.

To calculate the amount of NaCl (sodium chloride) in moles required to prepare a 0.200 mol/dm³ solution in a volume of 250 cm³, you can use the formula:

Amount of substance (in moles) = Concentration × Volume

Given:

Concentration (C) = 0.200 mol/dm³

Volume (V) = 250 cm³

First, convert the volume to dm³:

Volume (V) = 250 cm³ = 250/1000 dm³

= 0.250 dm³

Now, use the formula to calculate the amount of NaCl in moles:

Amount of NaCl = Concentration × Volume

Amount of NaCl = 0.200 mol/dm³ × 0.250 dm³

Amount of NaCl = 0.050 moles

Therefore, 0.050 moles of NaCl is required to prepare 250 cm³ of a 0.200 mol/dm³ solution.

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