4. Manik saw his father watering his garden plants in hot weather. He noticed that
water doesn’t stick to the plant leaves and leaves become dry but looked fresh. He asked

following questions to his teacher

a. Which tissue forms the outer covering of a plant and does it have a protective role

to play?How ?

b. Why does water not stick to the leaves?

Answer:

electrolytes

Explanation:

"Saccharomyces cerevisiae causes bread to rise by creating carbon dioxide bubbles as a byproduct of fermentation."

This statement is true.

Fermentation is the technique of making carbon dioxide bubbles that reason the dough to rise.

Carbon dioxide is produced in the course of fermentation and turns into trapped withinside the dough as a small wallet of air. this will increase it. When baked, the carbonic acid expands and the bread rises even extra.

Bread rises due to the fact the yeast eats the sugar and releases the carbon dioxide trapped withinside the gluten of the bread. The extra sugar the yeast eats, the extra fuel line it produces, and the taller the bread rise!

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Empirical formula for the hydrocarbon is C₅H₂

Moles of C=6.43CO2 x 1 mol CO₂/44 g x 1 mol C/mol CO₂=0.14 moles of C

Moles of H=2.19 H₂O x 1 mol H₂O/18 g x 2 mol H/mol H₂O=0.12moles of H

Dividing both by 0.14

1 mol C=0.8571mol H

Multiplying both by 3

5 mol C

2 mol H

Empirical formula =C₅H₂

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Answer:

Explanation:

To determine the mass of each compound, we need to convert them into units of moles first. We use avogadros number to do this and use the molar mass of the compounds to convert to mass.

3.01 × 1023 molecules H2O ( 1 mole / 6.022x10^23 kg) (18.02 g / 1 mole) = 9.01 g

8.32 × 1020 formula units CaBr2 ( 1 mole / 6.022x10^23 kg) (199.89 g / 1 mole) = 0.28 g

1.93 × 1026 molecules XeF6 ( 1 mole / 6.022x10^23 kg) (245.28 g / 1 mole) = 78610.16 g

Answer:1,430,880 feet.

Explanation: You would multiply 271*5280 because there are 5280 feet in one mile. This equals 1,430,880 feet.

Answer:

The logs are the input and the flames are the output

Explanation

Henderson's Hasselbalch equation for the propanoic acid

[tex]solution \: is \: pH=4.874 + log \frac{[A ^{ - } ] }{HA}[/tex]

This is called known as the Henderson- Hasselbalch equation which relates the pH of an acid aqueous solution with the acid dissociation constant.

[tex]pH=pK _{a } + log \frac{Conjugate \: base}{acid}[/tex]

The Henderson-Hasselbalch equation is derived from the definition of the acid dissociation constant as follows.

Consider the hypothetical compound HA in water.

[tex]HA +H _{2}O→ H _{3} O ^{ + } + A^{ - } [/tex]

The acid dissociation constant of HA,

[tex] [H _3O ^{ + }] = K _a \times \frac{HA}{[A ^{ - } ] }[/tex]

[tex]log [H _3O ^{ + }] = logK_a+log\frac{HA}{[A ^{ - } ] }[/tex]

Multiply both sides of the equation by -1.

[tex]-log[H_3O ^{ + }]=-logK_a-log\frac{HA}{[A ^{-} ] }[/tex]

[tex]pH=pK _{a }+log \frac{[A ^{ - } ] }{HA}[/tex]

[tex][HA] = [A-][/tex]

[tex]pH =pKa +log1[/tex]

[tex]pH = pKa + 0[/tex]

pH=pKa

pKa value of compounds can be determined experimentally using its relation with pH.

According to the Henderson-Hasselbalch equation, when the concentrations of the acid and the conjugate base are the same, i.e when the acid is 50% dissociated, the pH of the solution is equal to the pKa of the acid.

[tex]pK _{a } \: value \: for \: propanoic \:acid \: = 4.874[/tex]

[tex]Let \: propanoic \: acid \: be \: HA.[/tex]

[tex]Let \: propionate \: be \:A ^{ - } .[/tex]

So Henderson-hasselbalch equation for the propanoic acid solution is,

[tex]pH=pK _{a } + log \frac{[A ^{ - } ] }{HA}[/tex]

[tex]pH=4.874 + log \frac{[A ^{ - } ] }{HA}[/tex]

Therefore, Henderson's Hasselbalch equation for the propanoic acid solution is

[tex]pH=4.874 + log \frac{[A ^{ - } ] }{HA}.[/tex]

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Answer:

Carboxylic acid group

Explanation:

Carboxylic acid and amine groups form the basis of an amino acid.  One group reacts with the other group on a neighboring amino acid to form the peptide bond, with the release of a water molecule.

The most complete charge balance expression for a saturated solution of CaC₂O₄ is [Ca²⁺] = [C₂O₄²⁻]

Saturated solution is a solution that has dissolved as much solute as it is capable of dissolving. CaC₂O₄ is named as Calcium oxalate it is colourless solution. complete charge balance expression for a saturated solution of CaC₂O₄ are as follow:

CaC₂O₄ → 1Ca²⁺ + 1C₂O₄²⁻

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Answer:

D. Some positive particles bounced back in the direction they came from

Answer:

Explanation: 15 grams trust me.!!

A lead ball added to a graduated cylinder containing 30.8 ml of water, causing the level of the water to increase to 89.9 ml, has a volume of 59.1 ml.

Volume is defined as the amount of space that matter occupies. There are three different ways to find the volume:

1) Volume by Space - by measuring its physical dimensions

2) Volume by Density and Mass - by dividing its weight by its density

3) Volume by Displacement - by measuring the volume displaced when immersed in a liquid or gas

To solve for the volume of the lead ball, we can use the displacement method by subtracting the initial volume from the final volume.

If the level of the water increased from 30.8 ml to 89.9 ml upon adding the lead ball, the displaced volume is:

volume = final volume - initial volume

volume = 89.9 - 30.8

volume = 59.1 ml

Hence, the volume of the lead ball, using displacement method, is 59.1 ml.

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Answer: 59.1 mL

Explanation: In order to find the volume of the lead ball, you will simply take the difference between the volume of the water before and after the ball was submerged.

The conversion of each of the measurements given to the new unit stated using the factor label method is as follows:

1 Foot = 30.48 cm.

∴ 26 cm = 26/30.48 = 0.853 foot.

1lb = 453.59 g.

16 lb = 453.59 × 16 = 7257.48 g.

1 year = 365 days; 1 day = 24 hours; 1 hour = 60 minutes; 1 minute = 60 sec.

1 year = 365 × 24× 60× 60 = 31,536,000 seconds.

1 mile = 1.60 km.

3.5 mile = 3.5 × 1.60 = 5.63 km.

The factor label method may be defined as a type of technique that is significantly utilized in order to convert one unit of measurement into the other with the utilization of the conversion factor.

Therefore, the conversion of each of the measurements given to the new unit stated using the factor label method is well-described above.

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The net ionic equation for the overall reaction that occurs when aqueous solutions of carbonic acid and potassium hydroxide are combined is:-

H₂CO₃ + KOH ⇒ K₂CO₃ + H₂O

The reaction between an acid and base is known as a neutralization reaction.

In a neutralization reaction, an acid and a base react to produce a salt and water along with it.

Here H₂CO₃ is a weak acid and KOH is a base.

We have been given the information that the base i.e. KOH is present in excess amount.

Thus, the reaction between H₂CO₃ and KOH is as follows:

H₂CO₃ + KOH ⇒ K₂CO₃ + H₂O

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The molar absorptivity of the solute that absorbs 86% wavelength of light when the beam passes through a 1.0cm cell containing a 0.16M solution is 5.375 mol L⁻¹ cm⁻¹

According to Beer-Lambert law,

"The concentration of a solution may be determined by measuring its absorbance since there is a linear relationship between the concentration and the absorbance of the solution."

A = εbC ......(i)

Where A ⇒ Absorbance

ε ⇒  Molar absorptivity

b ⇒ Length of the light path

c ⇒ Concentration

Now, A = 86%

b = 1.0cm

C = 0.16M

From (i)

A = εbC

0.86 = ε × 1 × 0.16

0.86 = ε × 0.16

ε = [tex]\frac{0.86}{0.16}[/tex] mol L⁻¹ cm⁻¹

ε = 5.375 mol L⁻¹ cm⁻¹

Therefore, the molar absorptivity of the solute is 5.375 mol L⁻¹ cm⁻¹

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The mass of fuel the airplane taken on is 1.81 × 10⁵ g or 1.81 × 10² kg.

V(fuel) = 221 l

V(fuel) = 221 l × 1000 ml/l

V(fuel) = 221 000 ml = 2.21 × 10⁵ ml; volume of the fuel

d(fuel) = 0.821 g/ml; density of the fuel

m(fuel) = V(fuel) × V(fuel)

m(fuel) = 2.21 × 10⁵ ml × 0.821 g/ml

m(fuel) = 1.81 × 10⁵ g; mass of the fuel

m(fuel) = 1.81 × 10⁵ g × 10⁻³ kg/g

m(fuel) = 1.81 × 10² kg

Density is a measure of mass per unit of volume (in this example grams per milliliter).

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The answer of the the percentage of zinc in the alloy is 33.33%.

Mass percent is the mass of the element or solute divided by the mass of the emulsion or solute. The result is multiplied by 100 to give a percent. The formula for the quantum of an element in a emulsion is mass percent = (mass of element in 1 operative  of emulsion / mass of 1 operative of emulsion) *100.

An alloy, metallic substance comprised of two or more elements, as either a compound or a solution. For example: Brass is an alloy of two metals: copper and zinc.

According to question,

Mass of pure Gold = 64g

Mass of pure zinc = 32 g

Now,

Total weight of alloy is = 64 + 32 = 96 gram

32 g of which is zinc

So percentage (%) of zinc in the alloy is 32/96*100 =  33.33 %

Hence, the percentage of zinc in the alloy is 33.33%.

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Yes, I have tried eating delicious delicacies served in the school canteen during recess time.

The combination of these components in food produces different end products like vitamins, minerals, and many other nutrients which are beneficial for a healthy body.

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10 mL of 0.1 M NaOH  is equal to 1 equivalent of base, if titrating 10.00 mL of 0.1 M amino acid.

Given :

0.1 M NaOH

0.1 M Amino acid

10.00 mL volume of Amino acid

            R-CH(NH₂)-COOH + NaOH → R-CHNH₂Na + H₂O

In this case, end factor = 1 and It is 1 mole / 1 mole ratio

Since, the concentration of amino acid and NaOH are same, that is 0.1 M.

   Concentration of amino acid = concentration of NaOH

                                          0.1 M = 0.1 M

Therefore, 10 mL of NaOH is required to neutralize 10 mL of amino acid and the end factor is equivalent to 1.

Hence, The volume of 0.1 M NaOH is equal to 1 equivalent of base.

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Imagine a solution containing only water, sodium, and glucose. if a voltage is applied to the solution, there would be no net movement of glucose

The given declaration is wrong. Glucose answers aren't electrolytes and consequently do now no longer behavior power. Is sodium chloride an awesome conductor of power? Simply with the aid of using dissolving or dissolving it in water, it can not behavior power as a solid.

Saline includes Na+ and Cl- ions. If ions are gifted withinside the answer, those ions can pass thru the answer and convey an electric-powered current. Pure water and sugar answers do now no longer include widespread ions. glucose molecules do now no longer smash down into ions whilst dissolved.

When glucose is introduced to water, it dissolves without difficulty however now no longer dissociates into ions. Therefore, a glucose answer isn't an electrolyte and isn't a conductor of power.

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The another name for relative abundance is Percent Composition

So, option A is correct

The relative abundances of all the stable isotopes of an element always add up to 100% since relative abundances are typically reported as percentages. A weighted average of these numbers determines the average atomic mass of an element.

The fraction of an isotope that is present on earth is quantified as its percentage abundance. It provides the amount of that specific isotope. The fraction of an isotope species in relation to all other elements in nature is known as relative abundance.

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The planet that will have a diameter that is approximately ten times larger than Mercury on a scale model is Neptune (option B).

A scale model is a three-dimensional copy or representation of something in which all parts have dimensions in the same proportion to that of the original.

In the solar system, there are nine planets. These nine planets in a decreasing order of their size (diameter) are as follows:

Based on the original diameters of the planets, it can be said that the planet that will have a diameter that is approximately ten times larger than Mercury on a scale model is Neptune.

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Answer:

neptune

Explanation:

Answer:

1. there are 29,000 grams present in 29 kilograms

2. there are 2000 millimeters present in 2 meters.

check out this conversion table if you get stuck again! :)

Water has more structure than other liquids because of its ability to form hydrogen bonds. Because of this phenomenon, water expresses a relatively high density, which allows it to cushion and protect the body’s structures.

Water is a chemical element consisting of hydrogen and oxygen and exists in gaseous, liquid, and solid states. It is one of the most abundant and important compounds. It is a tasteless, odorless liquid at room temperature and has the significant ability to dissolve many other substances.

You may be surprised to learn that most of Liverpool's drinking water comes from two beautiful lakes, Llyn Celyn and Vyrnwy, 80km south of Wales. Both lakes supply millions of gallons of water to the city each day. In humans, it functions as both a solvent and transport mechanism, dissolving essential vitamins and nutrients from food and delivering them to cells. Our bodies also use water to flush out toxins, regulate body temperature, and support metabolism.

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The mass number of the atom is 21, the atomic number is 9, and the element is Fluorine. There are 9 protons, 9 electrons, 12 neutrons, and the elemental symbol is F.

For every atom:

In the diagram:

Number of electrons = 9

Number of protons = 9

Number of neutrons = 12

Mass number = 12 + 9

                      = 21

Atomic number = number of protons

                         = 9

Element with atomic number 9 = Fluorine

Symbol of the element = F

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Secondary pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.

The secondary pollutants are the type of pollutants that are formed as a result of combination of two or more primary pollutants in the presence of sunlight.

Examples of secondary pollutants include the following:

Therefore, Secondary pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.

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0.125 mg of cesium-137 would remain.

For calibrating radiation-detection tools like Geiger-Mueller counters, modest amounts of cs-137 are utilized. Cs-137 is employed in higher concentrations in medical radiation therapy equipment for the treatment of cancer, in industrial gauges that monitor liquid flow through pipelines, and in other industrial equipment to gauge the thickness of materials including paper, photographic film, and metal sheets.

In nuclear reactors and during the testing of nuclear weapons, one of the consequences of nuclear fission is cs-137. Due to nuclear reactor mishaps, such as the 1986 Chernobyl power plant accident, which spread Cs-137 to numerous European nations, and nuclear weapons testing that took place in the 1950s and 1960s, small amounts of Cs-137 can be discovered in the environment.

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The density of water at room temperature is 1.0 g/ml.

Density is defined as the mass per unit volume. It gives the denseness of a given substance in a specific space. Different substances have different densities.

The formula to calculate the density is:

                                        ρ =m/v

where,

ρ is the density, m is the mass of the object and V is the volume of the object. The SI unit of density is kg/m³, but we use g/ml for our convenience.

For example, the density of water is 1000 kg/m3 but we convert it into 1.0 g/ml.

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Answer:

Inert  (or noble) gases are stable and mostly non-reactive. They have a full outer shell of valence electrons which gives them little tendency to participate in chemical reactions.

Explanation:

Mass of potassium chloride (KCl) is 1.7 grams.

M(KCl) = 74.55 g/mol; molar mass of potassium chloride

V(KCl) = 650 ml = 0.65 l; volume of potassium chloride solution

c(KCl) = 35 mM = 0.035 M; concentration of potassium chloride solution

m(KCl) = c(KCl) × V(KCl) × M(KCl)

m(KCl) = 0.035 M × 0.65 l × 74.55 g/mol

m(KCl) = 1.7 g; mass of potassium chloride

Potassium chloride (KCl) is a salt with ionic bond.

Molecular weight is  the sum of the atomic weight values of the atoms in a molecule.

The concentration is the amount of solute that has been dissolved in a given amount solution.

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