FeSO4(aq) + K3PO4 (aq) —>

K2CO3 (aq) + CdI2 (aq) —>

CaCo3 (aq) + HNO3 (aq) —>

From the idea that the KCN is made of two ions of opposite charge, then the compound is ionic.

We can say that a compound is ionic if the compound that is in question is composed of ions. Note that ions are species that are positively or negatively charged. As such, ionic compounds are essentially an ion pair and they are different from the covalent compounds.

The compounds that are covalent are the compounds that are forms when two atoms share electrons in a bond. In this case, there are no ions and we do not have species that have a full positive or negative charge as we do have with the ionic compounds that we discussed earlier here.

As we can see, the KCN compound is composed of the potassium ion that is positively charged as well as the cyanide ion that is negatively charged thus the compound must be said to be an ionic compound.

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By using Dalton’s law of partial pressure, it is calculated that the [tex]CO_2[/tex]collected in the experiment has a pressure of 725.35 mm Hg.

A gas mixture's total pressure is equal to the total of the partial pressures of its component gases, according to Dalton's law of partial pressures.

Looking at the pressure in a closed container of gas and water is a frequent application of the Dalton's law of Partial Pressures. The pressure that the gas puts on the liquid is the system's overall pressure.

Real gases do not behave in an ideal manner; instead, they behave in an ideal manner only at low pressures and high temperatures. As a result, Dalton's law of partial pressure is only relevant at low pressures and low temperatures; it is not applicable at high pressures and low temperatures.

Given:

Pressure of mixture = 744 mm Hg

Temperature = 21℃

Pressure of Water vapour = 18.65 mm Hg

To find:

Pressure of [tex]CO_2[/tex] = ?

Formula:

Pressure of mixture = Pressure of [tex]CO_2[/tex] + Pressure of water vapour

Pressure of [tex]CO_2[/tex] = 744 - 18.65

P of [tex]CO_2[/tex] = 725.35 mm Hg

Result:

The pressure of [tex]CO_2[/tex] collected in the experiment is 725.35 mm Hg, according to Dalton’s law of partial pressure.

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All the stores in the fast food chain combined produce 28,952,381 pounds of carbon dioxide on a yearly level.

Because there's one dryer in the men's restroom and one in the ladies' restroom, we have two dryers per store. If each dryer operates 160 times per day per restroom, the total number of daily operations per store is 2 * 160 = 320. Because there are 6000 stores in North America, the total number of operations per day is 320 * 6000 = 1,920,000. Finally, because the stores in the fast food chain work 360 days a year, the number of hand dryer uses on a yearly level is 1,920,000 * 360 = 691,200,000.

Because each hand dryer use generates 19 g of CO2, the total mass of carbon dioxide produced on a yearly level is 19 g * 691,200,000 = 13,132,800,000 g. As each pound contains 453.60 grams, the approximate number of pounds produced is 13,132,800,000 / 453.60 = 28,952,381

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Answer:

True

Explanation:

Density is an intensive property. This means that regardless of the object's shape, size, or quantity, the density of that substance will always be the same. Even if you cut the object into a million pieces, they would still each have the same density

Most of the space in an atom is empty and a small, dense, positively charged nucleus is present at the center, which contained most of the mass of the atom, with the electrons orbiting the nucleus.

In 1909, Rutherford's alpha scattering experiment. In this experiment a stream of high speed alpha particles is directed at a thin piece of gold foil. During this experiment he observed that some of the particles passed through, some were deflected, and some bounced straight back. From this He concluded the following main points:

⇒ Most of the space in an atom is empty. Due to which some of the particles passed through without any change in their paths.

⇒ Some alpha particles were deflected, and some bounced straight back. This indicated a very small, dense, positively charged nucleus at the center, which contained most of the mass of the atom, with the electrons orbiting the nucleus.

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The volume of carbon dioxide gas produced at STP during the reaction is equal to 56 L.

Combustion reactions involve the complete oxidation of the fuel a hydrocarbon such reactions commonly liberate only carbon dioxide and water as products.

A hydrocarbon undergoes combustion to yield carbon dioxide and small amounts of water as the product. It can also be noted that no side products are left behind in the combustion reaction.

The given balanced combustion reaction of alcohol:

C₂H₅OH (l)  +  3O₂  (g) →  2CO₂  (g)  +  3 H₂O  (g)

One mole of the ethanol produced carbon dioxide = 2 mol

Then 1.25 mol of the alcohol produced carbon dioxide = 2.5 mol

The volume occupied by one mole of carbon dioxide = 22.4 L

The volume of  2.5 mol of CO₂ = 22.4 × 2 = 56 L

Therefore, the volume of CO₂ gas produced during the reaction is 56 L.

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Answer: 56L

Explanation: The volume of carbon dioxide gas produced at STP during the reaction is equal to 56 L.

Based on the rate constant of the reaction, the reaction rate, r 4.8 * 10⁻⁷ mol/L.s

The rate of a reaction is the number of moles of reactant molecules converted or the number of moles of product molecules formed per unit time.

It is the rate at which product molecules are formed or reactant molecules disappear.

The rate equation of a chemical reaction is an expression that describes the relationship between the rate of the chemical reaction and the concentration of the reactants in the chemical reaction.

The rate equation includes a rate constant which is a constant that is unique for a given reaction. The rate constant numerically describes the rate and direction of a chemical reaction.

Considering the given rate equation:

reaction rate = k [NH4 + (aq) ] [NO2(aq) ]

the data provided is as follows;

k =  3.20 x 10⁴ L/(mol⋅s)

[NH4+ ] = 0.100 mol/L and,

[NO2] = 0.0150 mol/L

The reaction rate, r will be:

r = 3.20 x 10⁻⁴ L/(mol⋅s) * 0.100 mol/L *  0.0150 mol/L

r = 4.8 * 10⁻⁷ mol/L.s

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A balloon with a pressure of 1 atm and a temperature of 17° Celsius has a volume of 1000 mL. The day warms up and increases the temperature to 27° Celsius, which makes the pressure change to 1520 mm Hg.What is the new volume of the balloon, in Liters?

The new volume of the balloon is 0.517 L.

By ideal gas law, PV = nRT

P = pressure

V = volume

n = number of mole of gas

R = gas constant

T = temperature

Using ideal gas law, P₁V₁/ T₁ = P₂V₂/ T₂

P₁= 1 atm

V₁ = 1000 mL = 1 L

T₁ = 17° C = 290 K

After the day warms up:-

P₂ = 1520 mm Hg = 2 atm

T₂ = 27° C = 300 K

Put these values in formula, P₁V₁/ T₁ = P₂V₂/ T₂

V₂ =  P₁V₁T₂/ T₁ P₂

V₂ = 1 atm× 1 L × 300 K/ 290 K × 2 atm

V₂ = 0.517 L = 517 mL

Hence, the new volume of the balloon is 0.517 L.

The ideal gas equation is formulated as: PV = nRT.

In this equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the overall quantity of ideal gas this is measured in terms of moles, R is the universal gas constant, and T is the temperature.

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Mass of the liquid is the amount of the liquid counted up or measured in grams to calculate its actual mass.

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The question requires us to calculate the volume of hydrogen gas in a balloon, given the number of moles of hydrogen, temperature and pressure in the balloon.

We can collect the following information from the question:

number of moles of H2 = n = 0.24 mol

temperature = T = 35°C

pressure = P = 1.05 atm

Since we need to calculate the volume of a gas and the temperature and pressure given are not the under the STP (Standard Temperature and Pressure), we'll need to apply the Ideal Gas Law equation:

Rearranging the equation above to find volume (V), we have:

where n is the number of moles of hydrogen gas, T and P are the temperature and pressure given, and R is a the constant of gases (R = 0.0821 L.atm/mol.K)

Note that we need to use the units following the constant of gases - L for volume, atm for pressure, mol for number of moles and K for temperature. Thus, we need to convert the temperature given (35°C) into Kelvin degrees:

T = 35 + 273.15 = 308.15 K

Now that we have all required variables to calculate the volume, we replace them in the equation:

Therefore, the volume of hydrogen in the ballon, under the given temperature and pressure, is 5.78 L.

As the question requires the answer expressed with two signifcant figures, we can write that the volume of hydrogen is 5.8 L.

the volume of hydrogen is 5.8 L

Answer:

10.58km

The formula needed to calculate the amount of wire used is expressed as:

W is the weight of wire used to wind a magnet

wg is the weight of wire per km

Given the following parameters:

Substitute the given parameters into the formula to have:

Hence the length of wire used is 10.58km

Answer:

Composition. The ingredients of the solar nebula fell into 4 categories based on their condensation temperatures: metals, rocks, hydrogen compounds (water, methane, ammonia), and light gasses (hydrogen and helium).

Explanation:

The choice from above which is not true about the scientists who made contributions to the development of the atomic theory is:

Dalton was known for the plum pudding model of the atom.

The correct answer choice is option b.

John Dalton did not make a contribution of plum pudding model regarding the atomic theory. Surely, this model was based on the work of sir JJ Thomson. In his contribution, he stated that: " atoms were known to consist of negatively charged electrons "

An atom is an indivisible particle of an element which takes in a chemical reaction. This statement was made by Dalton.

So therefore, John Dalton did not propose the plum pudding model but was made by Thomson.

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When potassium reacts with fluorine to from potassium fluoride one electron transfers from potassium to fluorine .

One electron from potassium is transferred to fluorine during the reaction that produces potassium fluoride.

During the electron transfer mechanism, an iron atom in the pigment of a cytochrome molecule takes an electron, reducing it; the electron is then transferred to the iron atom in the following cytochrome carrier, oxidizing the first iron atom in the chain.

The reaction between potassium and fluorine results in a net positive charge for potassium and a net negative charge for fluorine, which together balance the compound potassium fluoride.

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Answer: convection

Explanation:

Scientists who make contributions to scientific knowledge often come from different backgrounds and live at different times. Option C.

The planets are in elliptical motion around the sun. The figure below shows two orbits with the same semimajor axis, focus, and orbital period. One is a circle with an eccentricity of 0.0. The other is an ellipse with an eccentricity of 0.8. Johannes Kepler was a German mathematician and astronomer who discovered that the earth and planets orbit the sun in elliptical orbits.

He gave his three basic laws of planetary motion. He also did important work in optics and geometry. Johannes Kepler is best known for his three laws of planetary motion. These laws are: Planets move in orbits shaped like ellipses. The lines between the planets and the sun cover equal areas in equal time. He formulated the law of universal gravitation. He identified the first moons of Jupiter. He collected detailed data that led to the proposal of the heliocentric model.

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Answer:

Answer:

This ammonium laurel sulfates anion consists of a nonpolar hydrocarbon chain and a polar sulfate end group. It means it has a hydrophilic head and hydrophobic tail. There are ammonium ions, sulfate, and fatty acids present.

Lauryl sulfate has lauric acid attach to sulfate ions with carbon-sulfur bond, the fatty acid formed by the covalent bonds between C-C attached to hydrogens. Sulfur also bound to oxygen by covalent bonds. Nitrogen is surrounded by the four hydrogen atoms in the hydrophilic head.

[tex]0.1158 \10^{-3} times[/tex] mol of NaOH  is needed to neutralise  36.1 ml of potassium hydroxide solution.

[tex]To\ determine\ the mass \ of {KHP}$ reaquired. \\we should first determine the number of moles of $\mathrm{NaOH}$ present is $3.21 \mathrm{~mL}$ of $36.1 \mathrm{M} \mathrm{MNaOH}$ solution.Moles of $\mathrm{NaOH}=$ molonity of $\mathrm{NaOH}$ $x$ solution of $\mathrm{NaOH}$ in $(\mathrm{L})$[/tex]

[tex]$$\begin{aligned}&=36.1\frac{\mathrm{mol}}{\mathrm{K}} \times \frac{3.21}{1000} \mathrm{~K} \\&=0.1158 \times 10^{-3} \mathrm{~mol} \text { of } \mathrm{NaOH}\end{aligned}$$[/tex]

moles are the a standard scientific unit used to measure large quantities of very small entities such as atoms, molecules, or other defined particles.  A mole means a very large number of units, 6.0221076 × 1023.

The number of atoms or other particles in a mole is the same for all substances. A mole is related to the mass of an element as follows:

one mole of carbon-12 atoms is 6.0221076 × 1023 atoms and has a mass of 12 grams. By comparison, one mole of oxygen, by definition, consists of the same number of atoms as carbon-12, but has a mass of 15,999 grams. Therefore, the mass of oxygen is greater than the mass of carbon. This reasoning can also be applied to molecular weights or formula weights.

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The volume in m³ needed to store one mole of cube-shaped children's blocks 2.00 cm long on each side is 4.816 * 10¹⁸ m³

The volume of one mole of cube-shaped children's blocks 2.00 cm long on each side is calculated as follows:

The volume, V, of a cube is calculated using the formula: V = s³

where s is the length of one side of the cube.

Length of a side of the cube-shaped children's blocks = 2.0 cm or 0.02 m

The volume of the cube-shaped children's blocks = 0.02 m * 0.02 m * 0.02 m

The volume of the cube-shaped children's blocks = 8 * 10⁻⁶ m³

Volume of one mole of the cube-shaped children's blocks = 6.022 × 102²³ ×  8 * 10⁻⁶ m³

Volume of one mole of the cube-shaped children's blocks = 4.816 * 10¹⁸ m³

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1.615304584 ×10⁵⁸ ways can 100 new male students be assigned to these five halls.

A probability is a number that expresses the possibility or likelihood that a specific event will take place. Probabilities can be stated as proportions with a range of 0 to 1, or as percentages with a range of 0% to 100%.

Ways of selecting 10 students out of 100 =  C(100,10) for D1.  

After that 100-10 = 90 students are remaining.

Ways of selecting 5 students out of 90 is C(90,5) for D2.

Ways of selecting 15 students out of 90-5 = 85 is C(85,15) for D3.

Now number of remaining students is 85 -15 = 70.

Now for each of these 70 students we have 2 choices D4 and D5.

So these 70 students can be distributed in 2^70 ways.

So number of ways 100 new male students can be assigned to these five halls is

[tex]\begin{aligned}&=C(100,10) \cdot C(90,5) \cdot C(85,15) \cdot 2^{70} \\&=1.73 * 10^{13} * 43949268 * 1.798 * 10^{16} * 1.1806 * 10^{21} \\&=\mathbf{1 . 6 1 5 3 0 4 5 8 4} * \mathbf{1 0}^{58}\end{aligned}[/tex]

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Answer:

The answer would be E, gymnosperm

Explanation: Gymnosperms are an ancient group of plants that do not have flowers, they have a unique reproductive process, and produce seeds that are bare—, that is the seeds are not enclosed in a fruit!

The first step we have to follow is to find the molar mass of FeCl2 using the atomic masses of each element:

It means that each mole of FeCl2 has a mass of 126.745g/mol.

Use the molar mass to find the mass of the given amount of moles:

It means that there are 110,141.405 grams of FeCl2.

In scientific notation it would be 1.10x10^5g.

there are 110,141.405 grams of FeCl2

The final concentration of the KOH if 20.00 grams of KOH is added into distilled water and diluted with water to 1000 mL of final volume is 0.35 M.

We know that,

The molar mass of KOH is 56.10 g/mol

The mass of KOH is 20.00 g

To calculate number of moles of KOH -

Moles of KOH = Given mass

                           Molar mass

Moles of KOH =   20.00 g    

                           56.10 g/mol

Moles of KOH = 0.35 mol

The volume to be made up to 1000 mL = 1 L

The final concentration of KOH can be calculated as -

The molarity of solution is the ratio of number of moles to the total volume of solution in liters.

Molarity =  Number of moles

                 volume of solution

Molarity = 0.35 M

                    1

Molarity = 0.35 M

Therefore, the final concentration of the KOH is 0.35 M.

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45.6 mL of 0.0600 M of [tex]Ba(OH)_{2}[/tex] is added to 25.0 mL of HCl of unknown concentration then , the  concentration of HCl is 0.032 M .

Calculation ,

Formula used : [tex]M_{1} V_{1}[/tex] =  [tex]M_{2} V_{2}[/tex]                 ...( 1 )

Where  [tex]M_{1}[/tex]= concentration of [tex]Ba(OH)_{2}[/tex]  =  0.0600 M ( given )

[tex]M_{2}[/tex] = concentration of HCl = ? ( to be find )

 [tex]V_{1}[/tex]= volume of [tex]Ba(OH)_{2}[/tex]  = 25.0 mL  ( given )

[tex]V_{2}[/tex] = volume of HCl = 45.6 mL  ( given )

Now , put the value of all volume and concentration in equation ( 1 ) we get .

0.0600 M ×  25.0 mL =  [tex]M_{2}[/tex]  × 45.6 mL

[tex]M_{2}[/tex]  =  0.0600 M ×  25.0 mL / 45.6 mL = 0.032 M

Therefore , concentration of  unknown concentration of HCl is 0.032 M .

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Two different samples of matter are measured in each of these glass containers. Both of the containers show the same measure for both samples of matter. The samples most likely to have volume in common.

The specific inertial and gravitational mass, as well as the volume it takes up, can be used to identify matter. A substance can exist in three basic states: solid, liquid, and gas.

Volume is a three-dimensional measurement that's used to gauge a solid shape's capacity. It implies that a closed form's volume determines how much space it can occupy in three dimensions.

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Answer:

The correct answer is volume

Hope it helps

Explanation:

A rate is what is used when two quantities are in a ratio but have different units. We can predict how one quantity will change as we adjust another using rates.

Volume of a cone = π*r^2*h/3

                              = π*10^2*20/3

                              = 2094.3951 cubic meters.

Volume of water lost when its 8 inches deep = V = π*r^2h/3

                                                                             = π·10^2·12/3

                                                                             = 1256.63706 cubic meters.

Remaining volume = 2094.3951 - 1256.63706

                               = 837.758 cubic meters.

Volume of water lost per minute = 0.5 cubic meters.

Time remaining =  837.758 * 0.5

                          = 7 hours approx.

Volume is a measurement of three-dimensional space that is occupied. It is frequently expressed mathematically using standard or SI-derived units. Volume and the measurement of length are connected.

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The pressure inside the tire, assuming that the gas acts as an ideal gas, will be 1.6253 atm or 23.8 psi.

For calculations like these we utilize the ideal gas equation:
PV = nRT,
where P is the pressure exerted by the gas, V is the volume taken up by the gas, n is the amount of the gas (in moles), R is the universal gas constant (0.082057 Latm/molK) and T is the temperature (in Kelvins). Now we can say that:
P = nRT/V,
and plug all the known values into the equation:
P = 0.552 mol * 0.082057 Latm/molK * 305 K / 8.50 L = 1.6253 atm

Finally, because 1 atm = 14.7 psi, the pressure in the tire will be 1.6253 * 14.7 = 23.9 psi

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