Q 9 The table lists the steps to clean water for drinking purpose. 1. Adding chlorine tablets to the water.2. Pouring the water through the candle filter 3. freezing the water 4. Reusing the water in multiple household activities Which set of steps would help to provide water fit for drinking?

(a) 1 and 2
(b) 2 and 3
(c) 3 and 4
(d) 4 and 1

The pH of added acid at 40 mL is 1.87.

Given,

Concentration of pyridine = 0.125 M

Concentration of HCl = 0.1 M

Volume of pyridine = 25 mL

The millimoles of HCl is calculated as follows:

mmol of HCl = Molarity × Volume of HCl

                     = 0.1 M × 40 mL

                     = 4 mmol

The millimoles of pyridine is calculated as follows:

mmol of pyridine = Molarity × Volume of HCl

                            = 0.125 M × 25 mL

                            = 3.125 mmol

The concentration of excess HCl is calculated as follows:

Concentration of excess HCl = Millimoles / Total volume

                                                = (4.0 - 3.125) mmol / (40 + 25) mL

                                                = 0.0135 M

The pH of added acid is calculated as shown below:

pH = - log [H⁺]

     = - log (0.0135)

     = 1.87

Hence, the pH of added acid is 1.87.

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The specific heat capacity of the alloy is 0.120 J/g°C.

What is Specific heat capacity?

Specific heat capacity, also known as specific heat, is the amount of heat required to raise the temperature of a unit mass (usually one gram) of a substance by one degree Celsius or Kelvin. Each substance has its own specific heat capacity, which depends on its chemical composition and physical state. The SI unit of specific heat is joules per gram per degree Celsius (J/g°C).

First, we need to calculate the heat absorbed by the water:

q_water = m_water * C_water * ∆T

where m_water is the mass of water, C_water is the specific heat capacity of water, and ∆T is the change in temperature of the water.

m_water = 50.0 g

C_water = 4.18 J/g°C

∆T = 31.10°C - 22.00°C = 9.10°C

q_water = (50.0 g) * (4.18 J/g°C) * (9.10°C) = 1911.5 J

Next, we need to calculate the heat released by the alloy:

q_alloy = - q_water

Since the calorimeter is insulated, the heat lost by the alloy is equal to the heat gained by the water.

q_alloy = m_alloy * C_alloy * ∆T

where m_alloy is the mass of the alloy, C_alloy is the specific heat capacity of the alloy, and ∆T is the change in temperature of the alloy.

m_alloy = 29.3 g

∆T = 31.10°C - 93.00°C = -61.90°C (note the negative sign)

q_alloy = (29.3 g) * C_alloy * (-61.90°C)

Finally, we can solve for the specific heat capacity of the alloy:

C_alloy = - q_water / (m_alloy * ∆T)

C_alloy = - (1911.5 J) / ((29.3 g) * (-61.90°C))

C_alloy = 0.120 J/g°C

Therefore, the specific heat capacity of the alloy is 0.120 J/g°C.

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The ratio of neutrons to protons, or the N/Z ratio, plays a crucial role in determining a nucleus' stability. The range of N/Z ratios in which nuclei are stable is generally referred to as the belt of stability.

If the forces between the constituents of the nucleus are equal, an atom is stable. If these forces are out of balance or if the nucleus has an excessive amount of internal energy, an atom is unstable (radioactive).

Z = 104 for Rutherfordium, element 104. The isotopes 261Rf and 262Rf, having masses of 261 and 262, respectively, have the longest half-lives. Accordingly, N/Z ratios are:

261Rf: N/Z = (261-104)/157 = 1.08

262Rf: N/Z = (262-104)/158 = 1.09

These N/Z ratios are a little bit higher than the average belt of stability values, which are about 1.0 for heavy nuclei. These isotopes are thought to be reasonably stable because they are close enough.

Z = 109 for Meitnerium, element 109. The isotopes 278Mt and 282Mt, with masses of 278 and 282, respectively, have the longest half-lives. Accordingly, N/Z ratios are:

278Mt: N/Z

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Answer:

Explanation:

I Thinks it B!!!

The number that is given as digits is established using significant figures. A meaningful representation of numbers is carried by these digits. Frequently, significant digits are employed in place of figures.

Thus, By counting all of the values beginning with the first non-zero digit on the left, we may determine the number of significant digits.

The crucial or important digits that accurately represent the meaning of a certain number are known as the significant figures of that number.

6.658, for instance, has four significant digits. These huge amounts give the numbers accuracy. Additionally, they are known as significant digits.

Thus, The number that is given as digits is established using significant figures. A meaningful representation of numbers is carried by these digits. Frequently, significant digits are employed in place of figures.

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Answer:

1 mole =6.02×10^23atoms

3.25×10^24atoms

3.25×10^24/6.02×10^23

5.40 moles

C is correct option

Answer:

\(m_{CaCO_3}=0.465g\)

Explanation:

Hello!

In this case, since the reaction between two aqueous solutions may turn out in the production of a solid precipitate, for potassium carbonate and calcium chloride, calcium carbonate is precipitated out as shown below:

\(CaCl_2(aq)+K_2CO_3(aq)\rightarrow 2KCl(aq)+CaCO_3(s)\)

Now, since the two reactants are in a 1:1 mole ratio, we infer they react in the same proportion, thus we compute the reacting moles, considering the used volumes of those molar solutions:

\(n_{K_2CO_3}=0.0152L*0.306mol/L=0.00465mol\\\\n_{CaCl_2}=0.0170*0.295mol/L=0.00502mol\)

Thus, since just 0.00465 mol out of 0.00502 moles of calcium chloride are consumed, the potassium carbonate is the limiting reactant, therefore the mass of yielded calcium carbonate (molar mass = 100.09 g/mol) is:

\(m_{CaCO_3}=0.00465molK_2CO_3*\frac{1molCaCO_3}{1molK_2CO_3} *\frac{100.09gCaCO_3}{1molCaCO_3}\\\\m_{CaCO_3}=0.465g\)

Best regards!

Answer:

hope it helps..

Explanation:

'Motile' (or moving) cilia are found in the lungs, respiratory tract and middle ear. ... These cilia have a rhythmic waving or beating motion. They work, for instance, to keep the airways clear of mucus and dirt, allowing us to breathe easily and without irritation.

Answer: to keep airway clear of mucus and dirt allowing us to breathe easy

Explanation:

Answer:

Na+, O, C, Na

(Na+ has more ionization energy and Na has less ionization energy)

Answer:

decreases by 10 gram

Explanation:

5g

Anything between 4 and 6 is ok.

The additional mass of solute to be added will be determined by the mass of solute required to saturate a solution of NaNO3 in 100. grams of H2O.

A saturated solution is one that contains just as much solute as it can normally hold at a given temperature. We should now that when additional solute is added to a saturated solution, the additional solute does not dissolve.

The table is not presented hence the question is incomplete. However, the additional mass of solute to be added will be determined by the mass of solute required to saturate a solution of NaNO3 in 100. grams of H2O.

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When a strong acid or base is added to water, the pH will change dramatically.

A strong acid is one that is completely dissociated or ionized in an aqueous solution. This means it gives off the greatest number of hydrogen ions or protons when placed in a solution. Examples of strong acid are HCl, HBr, H2SO4, HNO4. These acids when placed in water, produces greatest amount of hydrogen ions. The pH value changes drastically. Any that has very high concentration of hydrogen and ion is acidic.

Also when base is added to water, the pH of water will increase above 7 and become basic. The pH of water is 7, but when base is added to it increases above 7.

Base is any solution that is slippery to touch in water solution, changes color, react with acid to form salt and change red litmus paper to blue.

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The capacity of an object is measured by its volume. For instance, a cup's capacity is stated to be 100 ml if it can hold 100 ml of water in its brim. Here ice cube has particles that can be drawn closer to occupy smaller volume. The correct option is D.

Due to the strong intermolecular interactions, the solid molecules are very near to one another. Solids have a low volume and a high density as a result. Additionally, the solid molecules cannot be easily crushed due to the narrow intermolecular distance.

So here ice cube has small volume.

Thus the correct option is D.

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Answer:

Explanation:

The statement the most abundant isotope of Hydrogen has a mass of 1 amu is wrong.

The average atomic mass could be obtained as the sum of the products of the percentage abundance of each of the hydrogen isotopes and the mass of the isotope.

We know that every element has isotopes. In every sample of the atom, there are various isotopes of the element. Thus the average atomic mass must take into account the masses of all these isotopes.

As such, the statement the most abundant isotope of Hydrogen has a mass of 1 amu is wrong.

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Answer: glucose

Explanation:

There are 7 unpaired electrons in [Ni(NH\(_3\))\(_6\)]\(_3\)⁺. The elementary electric charge of the electron is a negative one, making it a subatomic particle.

The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are part for the lepton particle family's first generation, are typically regarded to be elementary particles.

The mass of an electron is roughly 1/1836 that of a proton. The electron has a half-integer inherent angular momentum (spin) that is described in terms of the shortened Planck constant,, among its quantum mechanical features.  There are 7 unpaired electrons in [Ni(NH\(_3\))\(_6\)]\(_3\)⁺.

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To kill bacteria, chlorine is added to the water. However, it does not function immediately away and kill CDC.

Thus, When handled correctly, free chlorine* can destroy the majority of bacteria in a matter of minutes.

The CDC advises maintaining a pH of 7.2–7.8 and free chlorine levels of at least 1 ppm in swimming pools and 3 ppm in hot tubs and spas.

The CDC advises a pH of 7.2–7.8 and a free accessible chlorine content of at least 2 ppm in swimming pools when using cyanuric acid, a chlorine stabilizer, or chlorine products containing cyanuric acid (for instance, products generally known as dichlor or trichlor. The CDC advises against using cyanuric acid or chlorine products containing it in hot tubs or spas.

Thus, To kill bacteria, chlorine is added to the water. However, it does not function immediately away and kill CDC.

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Answer:

Explanation:

here's the answer hope it helps! :)

Answer:

I think it's Physical, Chemical, then Physical

Explanation:

I hope I'm right, those answers sound about right to me

Answer:

It would be to be hammered into shapes because malleability is how flexible a metal is.

Answer:

Follows are the solution to the given question:

Explanation:

Dry Soil weight = solid soil weight = \(284 \ grams\)

solid soil volume =\(205 \ cc\)

saturated mass soil = \(361 \ g\)

The weight of the soil after drainage is =\(295 \ g\)

Water weight for soil saturation = \((361-284) = 77 \ g\)

Water volume required for soil saturation =\(\frac{77}{1} = 77 \ cc\)

Sample volume of water: \(= \frac{\text{water density}}{\text{water density input}}\)

\(= 361- 295 \\\\ = 66 \ cc\)

Soil water retained volume = (draining field weight - dry soil weight)

                                             \(= 295 - 284 \\\\ = 11 \ cc.\)

\(\text{POROSITY}= \frac{\text{Vehicle volume}}{\text{total volume Soil}}\)

                    \(= \frac{77}{(205 + 77)} \\\\= \frac{77}{(282)} \\\\ = 27.30 \%\)

(Its saturated water volume is equal to the volume of voids)

\(\text{YIELD SPECIFIC} = \frac{\text{Soil water volume}}{\text{Soil volume total}}\)

                              \(= \frac{66}{(205+77)}\\\\= \frac{66}{(282)}\\\\=0.2340\\\\ = 0.23\)

\(\text{Specific Retention}= \frac{\text{Volume of soil water}}{\text{Total soil volume}}\)

                            \(= \frac{11}{282} \\\\= 0.0390 \\\\ = 0.04\)

Answer:

37.36 degrees Celsius

Explanation:

The temperature change of a substance can be calculated using the formula:

ΔT = Q / (m * Cp)

Where:

ΔT is the change in temperature (in degrees Celsius)

Q is the heat added or removed (in calories)

m is the mass of the substance (in grams)

Cp is the specific heat capacity of the substance (in calories per gram per degree Celsius)

For a 60g sample of iron with a specific heat of 0.214 cal/g*C and 2000 calories added to it, the temperature change would be:

ΔT = 2000 / (60 * 0.214) = 37.36 degrees Celsius

Answer:

C. 2,3,3,4-tetramethylhexane

Explanation:

Macromolecules that are composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio and include sugars, starches, glycogen, and cellulose is carbohydrate.

Macromolecules are molecules that are made of small molecules (monomers).

There are 4 types of macromolecules: carbohydrate, lipid, protein, and nucleic acid.

Thus, sugars, starches, glycogen, and cellulose are included in carbohydrates. The ratio of elements in carbohydrates is 1:2:1.

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A gallon is a common volume measurement unit for measuring liquids and occasionally dry things. 5 gallon is equal to 18.925 L.

Thus, The US liquid gallon, US dry gallon, and Imperial gallon are the three different sorts of gallons. To measure and store commodities like fuel, oil, milk, paint, and many other things, these three types are frequently employed.

The English Parliament created the gallon in 1696 to be used for measuring dry goods. After gaining independence, the US adopted the Winchester gallon, which is now known as the US dry gallon.

Both are now referred to as US liquid gallon and US dry gallon, respectively. On the other hand, the Imperial gallon was adopted by the British Empire in 1834.

Thus, A gallon is a common volume measurement unit for measuring liquids and occasionally dry things. 5 gallon is equal to 18.925 L.

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Picture 1 shows choice B

Explanation:

picture 1 shows the car to which the net force is a zero

Answer:

Explanation:

green

Answer:

0.99986

Explanation:

attached below is the detailed solution to the given problem

Express the ratios of the ground state energies of these atoms

ground state energies ( Ed , Ehe )

= Ed / Ehe = -13.5963 / -13.59815

                 = 0.99986