The tin and zinc contents of a brass sample are analyzed with the following results:

(a) Zn: 33. 27, 33. 37, and 33. 34%

(b) Sn: 0. 022, 0. 025, and 0. 026%

Calculate the standard deviation and the coefficient of variation (relative standard

deviation) for the analysis. ​

Yo,

In Geranium plant life red vegetation is given by using the allele R this is dominant (so RR or Rr ) genotype will produce crimson plant life.

If we communicate approximately the connected punnet square which i took from the workout e book, you could see that there was a cross made among vegetation with heterozygous genotype for red flora.

P1: Rr X Rr

Gametes: R: r : R : r

F1: RR: Rr: Rr: rr

so there is three: 1 in F1 offspring for red to white plant life.

Now the query is set f2 technology, while we cross F1 generation suppose we do a move of Rr and rr from F1 generations allow us to see what takes place.

F1: Rr: rr

Gametes: R: r: r: R

F2 : Rr : rr: Rr: rr

Rr: purple flowers

rr: White flora:

So the ratio in F2 era might be 2 crimson : 2 white. Please see connected punnet squares (first one for query) and the second of F1 move for better know-how.

I'm hoping that this will benefit you, so from my assumption and study it'd be 2 crimson : 2 white, if this is indeed the one i'm thinking of since nothing else was provided, if not please correct me.

Answer: 2 red : 2 white

Explanation:

I know

There are 0.030 moles of ZnCl₂ in 100.0 ml of a 0.300 M solution.

Molarity is a unit of concentration used to describe the amount of a solute dissolved in a given volume of solvent. It is defined as the number of moles of solute per liter of solution.

To calculate the number of moles of ZnCl₂ in a solution, we need to use the formula:

moles = concentration (molarity) x volume (in liters)

Given:

Concentration (molarity) = 0.300 M

Volume = 100.0 ml = 100.0 ml / 1000 = 0.100 L

Using the formula, we can calculate the number of moles of ZnCl₂:

moles = 0.300 M x 0.100 L

moles = 0.030 mol

Therefore, there are 0.030 moles of ZnCl₂ in 100.0 ml of a 0.300 M solution.

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Answer:

the answer to the qustion is 0.013089701 na

Explanation:

n/a

Answer:

High resistance

Low conductivity

Explanation:

The more resistance (aka less conductivity) there is, the more the energy is turned into heat than simply  passing through the object.

Answer: It is a negative ion that has one more valence electron than a neutral bromine atom.

Explanation: I Hope that helped !!

A consumer is known as a person who purchases the product for his or her own need and uses that product. Here Falling prices lead consumers to purchase more kayaks. The correct option is B.

The general decrease in the price of products as well as in the economy is defined as the fall in price. The falling prices occur for many reasons including supply and demand factors.

A decrease in demand and an increase in supply will cause a fall in equilibrium price, but the effect on equilibrium quantity cannot be determined.

Thus the correct option is B.

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There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, gems have ionic bonding and plastic beads have covalent bonding.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. Gems  have ionic bonds formed between metals and nonmetals. Plastic beads, will have covalent bonds because it is easily deformed.

Therefore, gems have ionic bonding and plastic beads have covalent bonding.

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According to the research, the correct option is false, the statement related to a chemical reaction is false.

They are reactions involving two or more substances (reactants), which change significantly in the process, and can consume or release energy.

Every chemical reaction subjects matter to a chemical transformation, altering its structure and molecular composition.

Therefore, we can conclude that according to the research, the correct option is false, the statement related to a chemical reaction is false.

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a. The number of grams of sodium oxide produced by 100 g Na would be 134.85 grams while the amount produced by 60 g oxygen would be 232.5 grams.

b. The mass of excess reactant left over at the conclusion of the reaction would be 24.624 grams of oxygen.

The unbalanced equation goes thus: \(Na + O_2 -- > Na_2O\)

First, we need to balance the equation of the reaction. This balanced equation is written as:

\(4 Na + O_2 -- > 2Na_2O\)

From the equation:

With 100 g Na:

Mole = 100/23

        = 4.35 moles

Equivalent mole of \(Na_2O\) = 4.35/2

                                          = 2.175 moles

Mass of 2.175 moles of \(Na_2O\) = 2.175 x 62

                                                 = 134.85 grams

Thus, 134.85 grams of \(Na_2O\) will be produced with 100g of Na.

With 60 g of oxygen:

Mole = 60/32

        = 1.875 moles

Equivalent moles of \(Na_2O\) = 1.875 x 2

                                           = 3.75 moles

Mass of 3.75 moles \(Na_2O\) = 3.75 x 62

                                           = 232.5 grams.

Thus, 232.5 grams of \(Na_2O\) will be produced with 60 g of oxygen.

To get the excess reactant:

Mole of 100 g Na = 4.35 moles

Mole of 60 g oxygen = 1.875 moles

Mole ratio of Na to oxygen = 4:1

Thus the excess reactant is oxygen.

Actual amount of oxygen = 4.35/4

                                           = 1.0875 moles

Excess mole of oxygen = 1.857 - 1.0875

                                       = 0.7695 moles

Mass of excess oxygen = 0.7695 x 32

                                       = 24.624 grams

Thus, the mass of the excess reactant left over after the conclusion of the reaction is 24.624 grams of oxygen.

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Answer:

A. Increasing the temperature.

The theoretical yield of SnS₂ will be 4.20 gram can be produced using the following reaction

From the equation of the reaction:

The mole ratio of the reactant is 1:2.

Mole of 35.2 mL, 0.419 M SnBr₄  = 0.419 x 35.2/100 = 0.147 mols

Mole of 51.1 mL, 0.203 M Na₂S = 0.203 x 51.1/1000 = 0.0103 moles

Thus, Na₂S is in excess while SnBr4  is limiting.

Mole ratio of SnBr₄  and SnS₂ = 1:1

Equivalent mole of SnS₂ = 0.023 moles

Mass of 0.023 moles SnS₂ = 0.023 x 182.81 = 4.20 grams

The quantity of a product obtained from a reaction which is expressed in terms of the yield of the reaction. the quantity of product predicted by stoichiometry is called the theoretical yield, whereas the quantity obtained actually is called the actual yield.

A limiting reagent may be a chemical reactant that limits the amount of product that is formed. The limiting reagent gives the littlest yield of product calculated from the reagents (reactants) available. This smallest yield of product is named the theoretical yield.

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Total heat generated by 2 mole of TiO2(s) is 4.963kJ.

The amount of heat released in the reaction of 2.89 mol of TiO2(s) can be calculated using the following equation: q = nCΔT, where n is the number of moles, C is the specific heat capacity of TiO2, and ΔT is the change in temperature.

The specific heat capacity of TiO2 is 683. 697. J/kgK. and the change in temperature is is 25k. By plugging in the values and converting J to kJ,

q = 2.89 * 25 * 683.697

=> 4963.35

In brief, the amount of heat released by 2.89 mol of TiO2(s) is 4.963kJ.

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Complete question :

determine how much heat (in kj) of 2.89 mol of tio2(s) with a temperature difference of 25k

Taking into account the definition of density, the mass of a substance with a volume of 150 cm³ and a density of 1.5 \(\frac{g}{cm^{3} }\)  is 225 grams.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

\(density=\frac{mass}{volume}\)

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

\(1.5 \frac{g}{cm^{3} } =\frac{mass}{150 cm^{3} }\)

Solving:

mass= 1.5 \(\frac{g}{cm^{3} }\)  ×150 cm³

mass= 225 g

In summary, the mass of a substance with a volume of 150 cm³ and a density of 1.5 \(\frac{g}{cm^{3} }\)  is 225 grams.

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Answer:

Plantae. Plants are multicellular and most don't move, although gametes of some plants move using cilia or flagella. Organelles including nucleus, chloroplasts are present, and cell walls are present. Nutrients are acquired by photosynthesis (they all require sunlight).

Answer:

the chemical formula of benzaldehyde is C₇H₆O

Answer

-52.2 Joules

Explanation

Given that;

Mass of krypton, m = 12.3 g

Temperature change, ΔT = 22.2°C - 39.3°C = -17.1°C

The specific heat of gaseous krypton, c = 0.248 J/g°C.

What to find:

The energy change, Q.

Step-by-step solution:

The energy change, Q can be determined using:

Q = mcΔT

Putting the values of the given parameters into the formula, this yields:

Therefore the energy change = -52.2 Joules

The balanced equation of the reaction is:

\(O_2 + 2 NO\) ⇒ \(2 NO_2\)

Every gas occupied 24 L in one mole in r.t.p. according to the equation:

\(24 \times n = V\)

8/24=0.333 mol

2 moles of NO makes 2 moles of \(NO_2\\\) so

0.333*24=8L

Answer:

Imo : Gas particles are in constant, random motion. The volume of gas particles is negligible in comparison to the volume of the container. There are no attractive forces between gas particles.

The distance between the gas molecules are far apart and they assume the volume and shape of their container.

The kinetic theory of gases states that gas molecules are in state of constant motion colliding with one another and with walls of the container.

Based on this theory, at an ideal condition the volume of the gas molecules are negligible and hence they take the shape of the containing vessel.

Thus, the distance between the gas molecules are far apart and they assume the volume and shape of their container.

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The molarity of a solution made by adding 1.565 moles  of PbNO3 to 500 mL is 3.13mol/L.

The number of moles of solute dissolved or present in one liter of a solution is known as the molarity of the solution. As a result, a solution is considered to contain one gram mole of the solute dissolved per liter* of the solution. It is represented by 'M'. It is quite important in biochemistry as it is extensively used during buffer preparations. The solution molarity make calculation easy for making combinations of buffer.

Molarity can be calculated as:

Molarity = no. of moles/ volume of solution in liters

Here, Volume of solution is .5 L

And no. of moles are 1.565

Thus M = 1.565/.5 = 3.13 mol/L

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The predicted product of the reaction shown is an ether, specifically methyl ethyl ether.

The reaction involves the dehydration of ethanol (HOCH2CH2OH) in the presence of sulfuric acid (H2SO4) and magnesium (Mg), which acts as a catalyst. The sulfuric acid protonates the hydroxyl group in ethanol, making it a better leaving group. The resulting carbocation then undergoes an elimination reaction with the neighboring hydroxyl group, resulting in the formation of methyl ethyl ether.

This reaction is known as the Williamson ether synthesis.

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Answer:beryllium and oxygen

Explanation: No explaination i just know

In a sunny day, the plant makes use of water through photosynthesis and transpiration.

Photosynthesis is defined as the process by which green plants, which has chlorophyll, makes use of water and carbondioxide in the presence of sunlight as energy to form oxygen and glucose.

Transpiration is the movement is of water out of the plant through its pores located on the leaves, roots and stem. This process is increased in sunny seasons.

Therefore, In a sunny day, the plant makes use of water through photosynthesis and transpiration.

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Answer:

in transpiration, because some of its properties change, water undergoes a physical change but keeps its identity. In photosynthesis, because its identity changes, water undergoes a chemical change.

Explanation:

Answer:

C Gamma Rays

Explanation:

Radio waves, on the other hand, have the lowest energies, longest wavelengths, and lowest frequencies of any type of EM radiation. In order from highest to lowest energy, the sections of the EM spectrum are named: *gamma rays* ,X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.

Answer:

1.717

Explanation:

Answer:

Chlorophyll makes plants green.

Enzymes are responsible for dictating what chemical changes happen and when, so thus they control the life process of the cells in our bodies.

The cell wall is what gives a plant cell it's distinct shape (animal cells don't have cell walls btw).

Intracellular fluid, or cytosol, is the fluids stored in the Intracellular compartment.

The cell membrane is the barrier between everything inside the cell, and everything else outside of it. It protects the contents of the cell from harm and releases toxins and other waste from it. The cell membrane is basically like the gate keeper of the cell.

Explanation:

Hope this helps, I tried :)

The [OH⁻] of the solution is approximately 7.14 x 10⁻¹³ M, and the pH is approximately 5.85.

To determine the [OH⁻] and pH of a solution, we need to consider the concentration of hydroxide ions ([OH⁻]) or the hydronium ions ([H₃O⁺]). In this case, we are given the concentration of fluoride ions (F⁻), which is the conjugate base of hydrofluoric acid (HF). Since HF is a weak acid, it partially dissociates in water to produce F⁻ and H₃O⁺ ions.

The concentration of F- ions is given as 0.140 M. To find the [OH⁻], we can use the fact that [OH⁻] = Kw / [H₃O⁺], where Kw is the ion product of water (approximately 1.0 x 10⁻¹⁴ M² at 25°C).

Assuming the [H₃O⁺] concentration is equal to the F- concentration, we can calculate the [OH⁻] as follows:

Kw = [H₃O⁺][OH⁻]

1.0 x 10⁻¹⁴ = (0.140)([OH⁻])

[OH-] = (1.0 x 10⁻¹⁴) / (0.140)

[OH-] ≈ 7.14 x 10⁻¹³ M

To find the pH, we can use the relationship pH = -log[H₃O⁺]. Since [H₃O⁺] is assumed to be equal to the F⁻ concentration, we can calculate the pH as follows:

pH = -log(0.140)

pH ≈ 5.85

Therefore, the [OH⁻] of the solution is approximately 7.14 x 10⁻¹³ M, and the pH is approximately 5.85.

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The complete question is:

Determine the [OH-] and pH of a solution that is 0.140 M in F-.

Answer:

Ba(ClO3)2(s)> BaCl2(s) + 3 O2(g)

Explanation

You have to balance the equation to get the same number of oxygens as on the other side with the reactants. So adding a 3 before O2 gives you six oxygens on each side.

Answer: yes

Explanation: its common sense

Answer:

2-chloro-2-butene.

Explanation:

The mass of 2.5 moles of NaCl is 146.25 g.

The mass of 2.5 moles of NaCl:

So, one mole of NaCl weighs 58.44 g. A 2.5 M solution is 2.5 moles per liter (Molarity is just the number of moles per liter). Therefore, 0.5 L would contain 1.25 mole. Hence, you would need 58.5×2.5 = 146.25 g

m(NaCl) = M×n

m(NaCl) = 58.5×2.5 = 146.25 g

The mass of 2.5 moles of NaCl is 146.25 g.

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The mass of NaCl is 146.25g .



Calculate the molar mass of NaCl ?

The Atomic mass of Na is 23g

Atomic mass of Cl is 35.5g

In the formula there is only one molecule of each element is present so,

Molar mass =23×1+35.5

. →58.5g/ mol

We have given ,

moles of NaCl →2.5 mol

molar mass of NaCl we have found earlier ,

58.5g/mol

No of moles = weight of NaCl /Mb

Mb represent molar mass ofNaCl

2.5=Wb/58.5

Weight of Nacl= 58.5×2.5

. →146.25g

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