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Answer:

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The molecular mass of the compound is required to calculate the molecular formula from the empirical formula.

A chemical formula that gives the total number of atoms of each element in each molecule of a substance.

Dividing the molar mass of the compound by the empirical formula mass. The result should be a whole number or very close to a whole number. Multiplying all the subscripts in the empirical formula by the whole number will give the resultant molecular formula.

Hence, the molecular mass of the compound is required to calculate the molecular formula from the empirical formula.

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The graph would not have plummeted if various species were planted due to improvement of the potato crops.

The term variety has to do with the planting of different species of plants on the same farm. We know that the planting of different species of the same crop helps to improve the resistance to diseases of a plant.

Hence, the graph would not have plummeted if various species were planted due to improvement of the potato crops.

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(a) The nature of bond between A and B is an ionic bond.

(b) The two main properties of the ionic compounds are:

(c) If the ionic compound is dissolved in water, the ions in the solid separate and disperse uniformly

Ionic compounds contain ions and are held together by the attractive forces among the oppositely charged ions.

An ionic bond is formed by the complete transfer of some electrons from one atom to another. The atom losing one or more electrons becomes a cation—a positively charged ion.

In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.

When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution.

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Answer:

clouds are formed when the invisible water vapour in the air condenses into visible water droplets or ice crystal

Answer: Clouds need two things to form: cool air and particles on which water vapor can condense. Clouds form as air cools. Cold air cannot hold as much water vapor, so the water vapor condenses. Water vapor condenses on small particles in the atmosphere, such as smoke, salt, and dust. As a result, clouds form.

Explanation: correct on edge

The theoretical amount of each product obtained are:

Mg(ClO₃)₂ + 2NaOH —> Mg(OH)₂ + 2NaClO₃

From the balanced equation above,

1 mole of Mg(ClO₃)₂ reacted with 2 moles of NaOH

Therefore,

2.72 moles of Mg(ClO₃)₂ will react with = 2.72 × 2 = 5.44 moles of NaOH

From the calculation above, we can see that a higher amount (5.44 moles) of NaOH than what was given (3.14 moles) is needed to react completely with 2.72 moles of Mg(ClO₃)₂

Therefore, NaOH is the limiting reactant

From the balanced equation above,

2 moles of NaOH reacted to produce 1 mole of Mg(OH)₂

Therefore,

3.14 moles of NaOH will react to produce = 3.14 / 2 = 1.57 moles of Mg(OH)₂

Thus, the theoretical yield of Mg(OH)₂ is 1.57 moles

From the balanced equation above,

2 moles of NaOH reacted to produce 2 mole of NaClO₃

Therefore,

3.14 moles of NaOH will also react to produce 3.14 moles of NaClO₃

Thus, the theoretical yield of NaClO₃ is 3.14 moles

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The alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.

The alkali metals have the high thermal and electrical conductivity. It has high lustre, ductility, and malleability as compared to other materials. Each alkali metal atom has one electron in its outermost shell which make more reactive.

So we can conclude that the alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.

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Explanation:

the answer for the above

is b)0.019

The statement that defines the specific heat capacity for a given sample is the quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure.

Specific heat capacity is the of heat to increase the temperature per unit mass.

The formula to calculate the specific heat is Q = mct.

The options are attached here:

Thus, the correct option is 4. The quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure.

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The biotic factors are bacteria soil, dead leaves, and stream water.

An abiotic factor is a non-living part of an ecosystem that shapes its environment.

Biotic and abiotic factors make up a community via interaction.

Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.

The dead leaves of plants are an abiotic factor, the bacteria in soil are living matter and stream flowing, etc.

Hence, the biotic factors are bacteria soil, dead leaves, and stream water.

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Answer:

Above all are correct answer.

some other benefits are like, Dietary fiber increases the weight and size of your stool and softens

Answer:

I Think its fiber helps digestion and can prevent constipation.and soluble fiber helps lower cholesterol, which may prevent heart disease.

Explanation:

The concentration of the ions of the solution is 5.7 * 10^-4 M.

The ICE table can be used to determine the equilibrium constant of the process; SrSO4(s) ⇔ Sr^2+(aq) + SO4^2-(aq). ICE stands for initial, concentration and equilibrium.

Thus;

    SrSO4(s) ⇔ Sr^2+(aq) + SO4^2-(aq)

I                            0                0

C                          +x                +x

E                           x                 x

Now;

Ksp = x^2

x = √Ksp

x = √3.2 x 10-7

x = 5.7 * 10^-4 M

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The equilibrium represents a buffer equilibrium is HI(aq)+H2O(l)→ H3O+(aq)+I−(aq)

Equilibrium is a process that occur in chemical reaction in which there is balance and stability. The rate of forward reaction is equal to the rate of backward reaction.

Buffer solution refer to a solution that have conjugate base and weak acid.

In buffer equilibrium, the weak acid isequal to the conjugate base be

Therefore, The equilibrium represents a buffer equilibrium

is HI(aq)+H2O(l)→ H3O+(aq)+I−(aq)

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Centimeters and millimeters are both interconvertible units to measure length. The conversion factor is as follows:

1 centimetre = 10 millimetres

This means that if a copper wire is 180cm long, the wire would be;

180 × 10 = 1800mm long

Also, the number of 40 mm segments of wire that can be cut from the length is calculated as follows:

1800mm/40mm = 45

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The answer to the problem 3.96 * 0.1159 is : 0.459 (3 significant figures)

Significant figures can be defined as numbers in a group of numbers that place number in the right value or worth.

Significant figures defined the value of measurement of  a particular number.

The rules of engagement in this case is the set of rules or laid down principles that direct how we interact with this significant figures and how they are used.

For this case the significant figures of the product will be the same as the figure with the least significant figure in the multiplication.

In conclusion, The answer to the problem 3.96 * 0.1159 is : 0.459 (3 significant figures)

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In Chemistry, a reactivity series of metals , also known as the activity series refers to the arrangement of metals in the descending order based upon their reactivity .

Salient Features :-

The metal reactivity series is given below :-

To access the reactivity of metal , from the given reactivity series identify any of the metal and locate the reactivity based upon the choice of reactivity. The metal at the top (Potassium) is most reactive and the metal at the bottom (Platinum) is the least reactive.

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Answer:

12 banana hands + 2 bottles of chocolate syrup + 12 scoops of Breyers ice cream + 2 containers of candy cherries(30 cherries/per) +  bottle of whipped cream.

Explanation:

Hope this helps!

Answer:

Heat

Explanation:

He proved that heat was a form of energy. That is why the Joule (1 N*m or 1 kg*m^2/s^2) is the SI unit of energy. We now know that heat energy is a form of kinetic energy associated with temperature changes due to the vibrational motion in matter.

Answer: 40.5 mol

Explanation:

Since this is a double replacement reaction, the unbalanced equation is something like follows:

[tex]\text{K}_{3}\text{PO}_{4}+\text{NaOH} \longrightarrow \text{KOH}+\text{Na}_{3}\text{PO}_{4}[/tex]

Balancing this equation,

[tex]\text{K}_{3}\text{PO}_{4}+3\text{NaOH} \longrightarrow 3\text{KOH}+\text{Na}_{3}\text{PO}_{4}[/tex]

From this equation, we can conclude that for every 3 moles of sodium hydroxide consumed, 1 mole of potassium phosphate is consumed.

This means the answer is 13.5(3)=40.5 mol

In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.

An abiotic factor is a non-living part of an ecosystem that shapes its environment.

Biotic and abiotic factors make up a community via interaction.

Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.

Hence, in this case, among the list of components given, the abiotic factors are water, rock, soil, sun

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[tex] \begin{gathered}\\ \underline{\boxed{\large\leadsto\frak\red{ Answer :- }}} \\ \end{gathered}[/tex]

What is an abiotic factor?

♠ Among the list of components given, the abiotic factors are water, rock, soil, sun

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

Answer:

The answer is D.

Explanation:

Including soluble fiber into your diet can lower cholesterol levels.

The genotype and phenotype ratio for the first cross will be 100% Rr and 100% round, while the second cross will be 1RR:1Rr, 50/50 round and wrinkled respectively.

Assuming that the seed shape allele is R(r).

For the first cross:             RR    x    rr

                                        Rr   Rr   Rr   Rr

Genotype ratio = 100% Rr

Phenotype ratio = 100% round

For the second cross:           RR    x    Rr

                                             RR   Rr   RR   Rr

Genotype ratio = 1RR : 1Rr

Phenotype ratio = 50% round and 20% wrinkled.

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The percent composition of boron in diborane (b2h6) is 78% because the mass of boron is higher than hydrogen atom.

Diborane is a poisonous, reactive gas that is produced by the action of acids on borides. Diborane is used as a reducing agent for making other chemicals and also act as a catalyst.

So we can conclude that The percent composition of boron in diborane (b2h6) is 78% because the mass of boron is higher than hydrogen atom.

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The compound diborane can be used as a rocket propellant. the percentage composition of boron in diborane (B2H6) is 75%. Option D. This is further explained below.

Generally, Diborane is simply defined as a compound having the molecular formula B2H6, Diborane is more often known as diborane.

In conclusion, As a rocket fuel, diborane is a useful chemical. Diborane (B2H6) contains 75 percent boron by weight.

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In a simple distillation setup, the sequence of equipment from the bench top to the round bottom flask is:

This is the process in which a mixture is separated through selective boiling and condensation.

The distillation flask and liebig condenser are usually located above the round bottom flask in the set up.

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Answer:

0.03 mol

Explanation:

The equation relating the number of moles and number of atoms is:

Number of atoms = number of moles × 6.02 × 10²³

[6.02 × 10²³ is the Avogadro's constant and is the number of particles in 1 mole of any substance.]

By rearranging the equation, we can find the number of moles of calcium.

Number of moles = (3.01 × 10²²) ÷ (6.02 × 10²³)

Number of moles = 0.05 moles of calcium

Now the only data we know about these two elements are their Mr values, so we are going to find the number of moles of magnesium using ratio.

    Moles : Mr

0.05 mol : 40.1

           x  : 24.3

[we are going to assume that x is the number of moles of magnesium that we have to find out.]

Cross multiply the ratios.

40.1x = 0.05 × 24.3

x = 1.215 ÷ 40.1 = 0.03 mol

Answer:

4.25atm

Explanation:

[tex]\frac{P1V1}{T1}\\[/tex]=[tex]\frac{P2V2}{T2}[/tex]

where ,

p1 =845/760=1.11atm

v1=6.50l

t1=25c +273k=298k

p2=?

v2=1850/1000=1.85l

t2=325k

so answer is 4.25 atm

Answer:

There is 1 cell in bacteria and it is called Prokaryotic cells

Explanation: