(iii) Explain why magnesium chloride has a high melting point.

The food caloric content of the candy bar in nutritional calories per gram is 135 Cal.

Calorimeter is used to measure the amount of heat energy (Q) produced during a certain reaction. It depends on the mass of the substance (m), heat capacity (c) and the change in temperature (ΔT) during the process.

Mathematically it could be represented as,

\(\rm Q\ =\ m\times c\times \Delta\ T\)

     \(\rm =\ 23.3\times 8.72\times 15.5\)

     \(\rm = 3149.228\ kcal\)

The heat released during the process is 3149.228 kcal.

To calculate the nutritional calories per gram, divide the heat released by the mass in grams.

\(\rm Calories\ per\ gram\ = \frac{3149.228}{23.3}\)

                            \(\rm = 135.16\ kcal\)

                            \(\rm = 135\ Cal\)

Therefore, The food caloric content of the candy bar in nutritional calories per gram is 135 Cal.

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Answer:    es no metales

Explanation:

Answer:

it is B Ovary.

Explanation:

Answer:

answer b

Explanation:

it says it above

Yes the all types of the consumers are the heterotrophs.

The consumers play a very important role in the ecosystem of the earth by maintaining the population and growth to the organism of the ecosystem. If we remove the consumer or either the producer then the whole system of the ecosystem will be destabilize, and thus the ecosystem can survive from the overpopulation problem and lack of food problem. The other organism can transfer energy to the consumer.

Both the primary (herbivores) and as well as the secondary (carnivores and omnivores) consumers are heterotrophs.

So we can conclude that yes the all types of the consumers are the heterotrophs.

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Answer:

(C) im pretty sure is the answer

Explanation:

The type of bonds does polar covalent bonds break down in chemical reactions is  ionic bonds and nonpolar bonds. Therefore, option C is correct.

Ionic bond is also known as electrovalent bond. The term ionic bond is defined as a chemical bond formed when one atom gives up one or more electrons to another atom.

It is also defined as when positively charged particle produce a bond with negatively charged particle. The chemical molecule sodium chloride is an example of an ionic bond.

In ionic bonding, the electrostatic attraction between oppositely charged ions, or between two atoms with sharply different electronegativities. The type of bonds does polar covalent bonds break down in chemical reactions is  ionic bonds and nonpolar bonds.

Thus, option C is correct.

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a) The saturated solubility level of KCl (aq) at 40°C is 35.7 g/100 mL of water.

b) No, the solution would not be saturated at 90°C. At this temperature, the solubility of KCl in water is higher than at 40°C. Therefore, more KCl can dissolve in 100 g of water at 90°C than at 40°C. To determine if the solution is saturated, we need to compare the amount of KCl that actually dissolved in the water to the maximum amount of KCl that can dissolve in the water at that temperature. If the amount of KCl that dissolved is less than the maximum amount, then the solution is unsaturated. If the amount of KCl that dissolved is equal to the maximum amount, then the solution is saturated. If the amount of KCl that dissolved is greater than the maximum amount, then the solution is supersaturated.

c) Two ways in which saturation can be achieved if only 40 g of KCl is added to 100 g of water at 90°C are:

i) Heating the solution to a higher temperature: As the temperature of the solution is increased, the solubility of KCl in water also increases. Therefore, by heating the solution to a higher temperature than 90°C, more KCl can be dissolved in the water until the solution becomes saturated.

ii) Allowing the solution to cool slowly: If the solutionis heated to a temperature higher than 90°C and then allowed to cool slowly, the solubility of KCl in water decreases as the temperature decreases. This means that as the solution cools, KCl will begin to precipitate out of the solution until the solution becomes saturated. Alternatively, if the solution is left undisturbed at 90°C and allowed to cool slowly, KCl will begin to precipitate out of the solution as it reaches its saturation point.

The mass (in grams) of lead that will plate out of the solution, given that 3.91 A is passed through the solution for 1.7 h is 25.66 g

First, we shall determine the charge flowing through the solution. This is shown below:

Q = It

Q = 3.91 × 6120

Q = 23929.2 C

Finally, we shall determine the mass of lead that will plate out of the solution. Details below:

Balanced equation

Pb²⁺ + 2e —> Pb

From the balanced equation above,

193000 C plated 207 g of lead

Therefore,

23929.2 C will plate = (23929.2 × 207) / 193000 = 25.66 g of lead

Thus, the mass of lead that  will plate out is 25.66 g

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The final temperature of the mixture in the coffee cup calorimeter is; 19.467 °C

According to the law of energy conservation:

As such; the heat transfer in the liquid water is equal to heat gained by the ice

Heat transfer by liquid water is therefore;

However, since 18g of water makes one mole

T2 = 19.467°C

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The enthalpy or heat content of a system can be defined as the sum of the internal energy and the pressure volume energy of the system. It is denoted by H. The energy change of mixture is  47 kJ.

The transference of energy may take place in the form of work if the system and surroundings have different pressures. According to international conventions, work done on the system is positive and work done by the system is negative.

The enthalpy change is:

ΔH = ΔU + PΔV

190 = ΔU + 143

ΔU = 47 kJ

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Answer:

Explanation:

I tried to figure it out but my head wasn’t working sorry

Answer:

amusement parks. Each day, we flock by the millions to the nearest park, paying a sizable hunk of money to wait in long lines for a short 60-second ride on our favorite roller coaster. The thought prompts one to consider what is it about a roller coaster ride that provides such widespread excitement among so many of us and such dreadful fear in the rest? Is our excitement about coasters due to their high speeds? Absolutely not! In fact, it would be foolish to spend so much time and money to ride a selection of roller coasters if it were for reasons of speed. It is more than likely that most of us sustain higher speeds on our ride along the interstate highway on the way to the amusement park than we do once we enter the park. The thrill of roller coasters is not due to their speed, but rather due to their accelerations and to the feelings of weightlessness and weightiness that they produce. Roller coasters thrill us because of their ability to accelerate us downward one moment and upwards the next; leftwards one moment and rightwards the next. Roller coasters are about acceleration; that's what makes them thrilling. And in this part of Lesson 2, we will focus on the centripetal acceleration experienced by riders within the circular-shaped sections of a roller coaster track. These sections include the clothoid loops (that we will approximate as a circle), the sharp 180-degree banked turns, and the small dips and hills found along otherwise straight sections of the track.

Answer: well, for starters the maximum weight of the cart does say 1686.5kg n u decided to raise the weight by les jus say 14 kg, well that extra 14 kg might be the reason the whole cart accidently tips when it makes a sharp turn, n that's what well cause a problem

Explanation: im n k12 2 so i should know

Answer:

help me with this

Explanation:

The correct option that represents the constants of the reaction vessel after the N₂ and Cl₂ react as completely as possible is A.

The balanced chemical equation for the reaction is:

N₂(g) + 3Cl₂(g) → 2NCl₃(g)

This means that 1 mole of nitrogen gas and 3 moles of chlorine gas react to produce 2 moles of nitrogen trichloride gas.

The contents of the two vessels are:

Vessel 1: 1 mole of N₂

Vessel 2: 3 moles of Cl₂

When these two vessels are combined, the chlorine gas will react completely with the nitrogen gas to produce nitrogen trichloride gas. The remaining gas in the vessel will be nitrogen trichloride gas.

Which is:

[N₂] = 0 mol

[Cl₂] = 0 mol

[NCl₃] = 2 mol

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Complete question:

11 Question 3 A =N O=CI N2 +3 Cl2 2 NC13 The contents of two vessels are combined, as shown. The balanced chemical equation for the reaction that occurs is also shown. Which of the following represents the contents of the reaction vessel after the N2 and Cl2 react as completely as possible?

The formula CH₂O must be a molecular formula. The molecular formula of a compound is the actual number of atoms of each element in a molecule of the compound, while the empirical formula is the simplest whole-number ratio of atoms in the compound.

The formulas PO, C₂H₆, CH₂O, C₃H₄O₃, and C₂H₄O₂can all be either molecular or empirical formulas.

However, for some formulas, there can only be one possible molecular formula, meaning that it cannot be represented as an empirical formula. For example, the formula CH₂O must be the molecular formula because the empirical formula, CH, represents half the number of atoms in the molecule.

So, the formula CH₂O must be a molecular formula.

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Complete question:

Some of the formulas could be either molecular or empirical formulas; however, some can only be molecular formulas. Which of the formulas must be molecular formulas?

РО

C₂H₆

CH₂O

C₃H₄O₃

C₂H₄O₂

Answer:

She measured the acceleration to show the force of the ball hitting the mannequin.

Explanation: this is the exact answer in edmentum

Answer: She measured the acceleration to show the force of the ball hitting the mannequin.

Explanation: EXACT ANSWER ON PLATO/EDMENTUM!!! <333

To calculate the molality of a solution, we need to know the number of moles of solute per kilogram of solvent.

In this case, the solute is ethyl alcohol (C2H5OH) and the solvent is water.

First, let's convert the mass of ethyl alcohol into moles:

molar mass of C2H5OH = 46.07 g/mol

moles of C2H5OH = 2.5 g / 46.07 g/mol = 0.054 mol

Next, we need to calculate the mass of water in the solution:

mass of water = 0.4 kg = 400 g

Finally, we can use the moles of solute and mass of solvent to calculate the molality of the solution:

molality = moles of solute / mass of solvent (in kg)

molality = 0.054 mol / 0.4 kg

molality = 0.135 mol/kg

Therefore, the molality of the solution is 0.135 mol/kg.

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Answer:

it will be no.A genotype

According to the research, the correct answer is Option 2. If the cell were only permeable to potassium ions there would be a slight change in membrane potential to a more negative value as potassium exits the cell.

It refers to the potential difference on either side of the membrane of a resting cell, that is, already repolarized where the channels are much more permeable to potassium than to sodium.

In this sense, it is determined by the ion concentration and membrane permeability where the inside of the cell has a more negative charge (potassium ions) relative to the outside (sodium ions).

Therefore, we can conclude that resting membrane potential causes the cell membrane inside to become negative because it has sodium ions towards the outside of the cell and potassium ions towards the inside, thus the correct answer is Option 2.

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Grams of aluminum that will be produced if 1.0 g of Ba react with 1.80 g of Al2(SO4)3 will be 0.28g Al. Hence option c) is correct.

A balanced equation is a chemical equation where mass is conserved and there are equal numbers of atoms of each elements on both the sides of equation.

Given, 1.80 g of Al2(SO4)3 and 1.0 g of Ba

So, (1.8 g)/(341.96 g) = 0.00526 moles of Al2(SO4)3

And, 1 mole = 341.96g Al2(SO4)3

Now, (0.00526 moles of Al2(SO4)3)*(2 moles of Al)

= 0.01052 moles of Al

So, (0.01052 moles of Al)*(27 grams of Al)

= 0.28g Al

Hence, option c is correct.

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Answer:

Explanation:

pOH = -log1.36 X 10^-10 = 9.87

pH = 14-pOH = 14-8.97 = 5.03

Ai. The car's initial kinetic energy is 22657.94 J

Aii. The car's initial potential energy is 939960.1 J

B. The car's final kinetic energy is 171420.38 J

C. The car's change in kinetic energy is 148762.44 J

Ai. How do I determine the car's initial kinetic energy?

We can obtain the initial kinetic energy of the car as illustrated below:

KE₁ = ½mu²

KE₁ = ½ × 566.99 × 8.94²

KE₁ = 22657.94 J

Aii. How do I determine the car's initial potential energy?

The car's initial potential energy can be obtained as shown below:

PE₁ = mgh

PE₁ = 566.99 × 9.8 × 169.164

PE₁ = 939960.1 J

B. How do I determine the car's final kinetic energy?

The final kinetic energy of the car can be obtained as illustrated below:

KE₂ = ½mv²

KE₂ = ½ × 566.99 × 24.59²

KE₂ = 171420.38 J

C. How do I determine the car's change in kinetic energy?

The change in the kinetic energy of the car can be obtained as follow:

ΔKE = KE₂ - KE₁

ΔKE = 171420.38 - 22657.94

ΔKE = 148762.44 J

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Answer:

25%

Explanation:

Ammonium Chloride NH4CI Fertilizer-grade NH4Cl usually contains 25% N. About two-thirds of the world capacity for manufacture of this material is located in Japan, with the remaining one-third situated in India and China.

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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Answer: Phase change from a liquid to a gas occurring at a specific temperature and pressure

Explanation:

Answer:

liquid changees to gas once it reaches a certain temp. piont. good luck :)

Explanation:

An ionic compound is one that dissolves in water to produce a solution with a pH of 11, has a high melting point, conducts electricity when molten, and burns in oxygen.

Positively charged ions, which are sometimes called as cations, and negatively charged ions, also called as anions together constitute an ionic compound, which are neutral substances. The name of the cation is written first, followed by the name of the anion, in case of binary ionic compounds (ionic compounds that only contain two types of elements).

An atom can establish bonds with other atoms in two main ways: covalent and ionic. Sharing of electrons between two or more atoms is involved in case of covalent bonding. When two or more ions come together, they can form ionic bonds that are held together by charge differences.

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The concentration of CO at Equilibrium is 0.0361 M

It is a state of dynamic equilibrium where the ratio of the product and reactant concentrations is constant.

Given ;

Balanced equation ;

Now, let's calculate final concentrations ;

There will react X M of COCl₂

Since, the mole ratio is 1 : 1

Now, Let's find Kc

Kc=  [CO] x [Cl₂] /  [COCl₂]  = 8.33 x 10⁻⁴

Kc = [X] x [X] / 1.6 - X = 8.33 x 10⁻⁴

8.33 x 10⁻⁴  = X² / (1.6 - X)

8.33 x 10⁻⁴ x (1.6 - X) = X²

0.0013328 - 8.33x 10⁻⁴ X = X²

X² + 8.33*10⁻⁴ X  - 0.0013328= 0

X = 0.0361 M = [CO] = [Cl₂]

[COCl₂] = 1.6 - 0.0361 = 1.5639 M

To balance this, we can calculate the Kc

Kc = (0.0361 x 0.0361) / 1.5639 = 0.000833

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