Potentially hazardous foods on their way for delivery to your establishment must be kept at what maximum temperature?.

Answer:

Physical state of reactants

Temperature

Concentration of reactants

Presence of a catalyst

Explanation:

The larger the surface area of a reactant, the faster the rate of the reaction. If the reactant is in powdered form, the reaction takes place faster than when the reactant is in solid or block form. This is due to the fact that the latter has larger surface area

Increase in temperature causes reactant molecules to gain kinetic energy thus increasing the rate if reaction

The reaction you are referring to is the bromination of a terminal alkene using N-bromosuccinimide (NBS) and carbon tetrachloride (CCl4) as solvents in the presence of heat. This reaction is known as the "Hell-Volhard-Zelinsky" (HVZ) bromination.

The mechanism of the HVZ bromination involves the formation of a free radical intermediate, which is generated by the reaction between NBS and a small amount of hydrogen bromide (HBr) that is formed by the reaction between the terminal alkene and NBS.

This free radical intermediate then reacts with the terminal alkene, leading to the formation of a bromoalkene. The reaction proceeds via an anti-Markovnikov addition of bromine to the terminal carbon of the alkene.

The role of CCl4 in this reaction is to act as a solvent and to facilitate the formation of the free radical intermediate. The reaction is typically carried out at elevated temperatures, which helps to generate the free radical intermediate and to promote the overall reaction.

Overall, the reaction can be represented by the following equation:

Terminal alkene + NBS + CCl4 + heat → Bromoalkene

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The mass of magnesium cyanide needed to prepare the solution is 1.57 g

We'll begin by calculating the number of mole of Mg(CN)₂. This can be obtained as follow:

Volume = 275 mL = 275 / 1000 = 0.275 L

Molarity of Mg(CN)₂ = 0.075 M

Mole = Molarity x Volume

Mole of Mg(CN)₂ = 0.075 × 0.275

Mole of Mg(CN)₂ = 0.020625 mole

Mole of Mg(CN)₂ = 0.020625 mole

Molar mass of Mg(CN)₂ = 24 + 2(12 + 14) = 76 g/mol

Mass = mole × molar mass

Mass of Mg(CN)₂ = 0.020625 × 76

Mass of Mg(CN)₂ = 1.57 g

Therefore, 1.57 g of Mg(CN)₂ is needed to prepare the solution

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The freezing point of the solution is -11.8 °C.

The boiling point of the solution is 103.31 °C.

To determine the freezing point of the solution, we can use the equation:

ΔTf = Kf * m

where:

ΔTf is the freezing point depression,

Kf is the cryoscopic constant (for water, Kf = 1.86 °C/m),

m is the molality of the solution (moles of solute per kilogram of solvent).

First, let's calculate the molality (m) of the solution:

Molar mass of ethylene glycol (C2H6O2):

C = 12.01 g/mol

H = 1.01 g/mol (x 6) = 6.06 g/mol

O = 16.00 g/mol (x 2) = 32.00 g/mol

Total molar mass = 12.01 g/mol + 6.06 g/mol + 32.00 g/mol = 50.07 g/mol

Number of moles of ethylene glycol (C2H6O2) = mass / molar mass

Number of moles = 30.8 g / 50.07 g/mol = 0.615 mol

Mass of water = volume x density = 96.6 mL x 1.00 g/mL = 96.6 g

Now, let's calculate the molality:

Molality (m) = moles of solute / mass of solvent (in kg)

Molality = 0.615 mol / 0.0966 kg = 6.36 mol/kg

Now we can calculate the freezing point depression (ΔTf):

ΔTf = Kf * m

ΔTf = 1.86 °C/m * 6.36 mol/kg = 11.8 °C

To find the freezing point of the solution, subtract the freezing point depression from the freezing point of pure water (0 °C):

Freezing point = 0 °C - 11.8 °C = -11.8 °C

To determine the boiling point of the solution, we can use the equation:

ΔTb = Kb * m

where:

ΔTb is the boiling point elevation,

Kb is the ebullioscopic constant (for water, Kb = 0.52 °C/m),

m is the molality of the solution (same value as calculated before: 6.36 mol/kg).

ΔTb = 0.52 °C/m * 6.36 mol/kg = 3.31 °C

To find the boiling point of the solution, add the boiling point elevation to the boiling point of pure water (100 °C):

Boiling point = 100 °C + 3.31 °C = 103.31 °C

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Answer:

d)the energy possessed by an electron at a set distance from the nucleus

Answer:

a

Explanation:

everything can be broken down to a smaller less useful compounds but never destroyed

Answer:

m= 6780mg = 6.78g = 6.8g

d= 6.8g/ml

V= m/d

V= 1ml

Answer:

I just did it home slice the first one's Ag+ and Zn2+ and the second one is A

Explanation:

I just did the assignment

Answer:

ag+ and zn2+

Explanation:

second question is A

Answer: There are 0.00054 moles of silane gas (SiH4) are present in 8.68 mL measured at 18 0C and 1.50 atm.

Explanation:

Given: Volume = 8.68 mL (1 mL = 0.001 L) = \(8.68 \times 10^{-3} L\),    

Temperature = \(18^{o}C = (18 + 273) K = 291 K\),

Pressure = 1.50 atm

The ideal gas formula is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

\(PV = nRT\\1.50 atm \times 8.68 \times 10^{-3} L = n \times 0.0821 L atm/mol K \times 291 K\\n = \frac{1.50 atm \times 8.68 \times 10^{-3} L}{0.0821 L atm/mol K \times 291 K}\\= \frac{0.01302}{23.8911}\\= 0.00054 mol\)

Thus, we can conclude that there are 0.00054 moles of silane gas (SiH4) are present in 8.68 mL measured at 18 0C and 1.50 atm.

Answer:

See below

Explanation:

The following reasons tell why atom combine to form compounds:

1) They want to follow octet or duplet rule and attain the noble gas configuration.

2) They combine to form compounds because of the electrostatic attraction between them.

3) They form compounds to lower their energy and to become stable.

\(\rule[225]{225}{2}\)

Hope this helped!

The pressure of the gas in the cylinder is 151.12 atm and 114,899.2 torr.

The pressure of a gas in a cylinder can be expressed in different units.

To convert the given pressure of 15.32 MPa to atmospheres (atm) and torr, we can use the following conversion factors:

1 atmosphere (atm) = 101.325

kilopascals (kPa) = 760 torr

First, we convert megapascals (MPa) to kilopascals (kPa) by multiplying by 1000.

Thus, 15.32 MPa is equal to 15.32 × 1000 = 15,320 kPa.

Next, we convert kilopascals to atmospheres by dividing by the conversion factor of 101.325 kPa/atm.

Thus, 15,320 kPa ÷ 101.325 kPa/atm = 151.12 atm.

Finally, to convert atmospheres to torr, we multiply by the conversion factor of 760 torr/atm.

Thus, 151.12 atm × 760 torr/atm = 114,899.2 torr.

Therefore, the pressure of the gas in the cylinder is approximately 151.12 atm and 114,899.2 torr.

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The balanced equation for the dissociation of PO43- is given by;PO43-(aq)  H2O(l) ⇌ HPO42-(aq)  OH-(aq)The phosphate ion, PO43-, reacts with water to form HPO42- (monohydrogen phosphate) and OH- ions.

The chemical equilibrium between these species is represented by the equation above. In the dissociation reaction of PO43- the phosphate ion reacts with water (H2O) to form monohydrogen phosphate ion (HPO42-) and hydroxide ion (OH-). The reaction can be described as;PO43-(aq)  H2O(l) ⇌ HPO42-(aq)  OH-(aq)where the reactants are on the left and products on the right. In the equation, the state of matter of each reactant or product is written in parenthesis after its chemical formula. In this reaction, the reactant PO43- is an aqueous solution, while H2O is a liquid.

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Answer:

  presents longitude lines as parallel

Explanation:

The Mercator projection shows longitude lines as  parallel, hence greatly distorts sizes and distances near the poles. A useful feature is that a course of constant bearing shows as a straight line.

Answer:

C.) presents longitude lines as parallel

Explanation:

Took it on E2020

Answer:

the spotlight effect.

Explanation:

The spotlight effect is a tendency to think that people get noticed more often than they really do. It is an overestimation of the situation regarding the concern of getting observed. It concerns the self-confidence of an individual. For example, an individual feels that everybody in a party would notice him for a bad pair of shoes while in reality, it does not concern them.

As per the question, the overestimation of people's reaction is known as the spotlight effect.

To determine the order of the reaction with respect to each reactant, we must compare how the reaction rate changes when its concentration changes.

We have in experiment one the same concentration of reactants and a speed equal to 8.0x10^-4 mol/(L.s).

Now, in the second experiment, the concentration of BrO3 doubles, and the rest of the reagents remain the same. The speed is also doubled since 8.0x10^-4 x 2 = 1.6 x 10^-3.

The same happens with Br-, in the third experiment. The rate doubles as the Br concentration doubles.

So for these two reactants, the rate of reaction will be first-order, since as the concentration increases the rate increases in the same proportion.

Now, for H+ we have that by doubling the concentration the rate quadruples. This means that the reaction order is second order. When changing the concentration, the speed changes in order equal to 2

Answer:

the order of reaction will be:

Respect BrO3-: First order

Respect Br-: First order

Respect H+: Second order

Answer: A. The wall push back on the ball with more force, which causes the return speed of the to increase.

Explanation: For every for exerted on an object, there is an equal force exerted in the opposite direction. When the ball hits the wall with more force, the wall pushes back on the ball with more force. This causes the return speed of the ball to increase. The force that the wall applies to the ball launches the ball in the opposite direction. The greater the force on the ball, the greater it’s speed becomes .

Answer: The wall pushes back on the ball with more force, which causes the return speed of the ball to increase.

Explanation: Correct on Study Island

Answer:

c

Explanation:

The presence of soil slows down the weathering of the underlying bedrock. Hence, option C is correct.

Weathering is the breaking down or dissolving of rocks and minerals on Earth's surface.

Heat and heavy rainfall increase the rate of chemical weathering.

Hence, the presence of soil slows down weathering of the underlying bedrock.

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Answer:

The volume of ozone produced is 7.53 L.

Explanation:

The reaction is:

3O₂(g)  →  2O₃(g)   (1)      

0.477 mol   V=?

11.3 L    

From the reaction (1) we have that 3 moles of O₂ produce 2 moles of O₃ so the volume of the ozone produced can be calculated as follows:

\( V_{O_{3}} = V_{O_{2}}*\frac{n_{O_{3}}}{n_{O_{2}}} = 11.3 L*\frac{2}{3} = 7.53 L \)

Therefore, the volume of ozone produced is 7.53 L.

I hope it helps you!

The ozone volume (in liters) is 7.53 L.

The volume of the ozone in liters should be

\(= 11.3 \times 2\div 3\)

= 7.53L

we have that 3 moles of O₂ produce 2 moles of O₃

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Answer: B

Explanation: Genetics has to do with genes, which is appearance, which is hereditary from the parent :)

Answer:

If a Maritime Tropical Air mass begins in the Southern United States and keeps traveling North directly over the central USA, it will turn into a polar air mass.

Explanation:

because Northern USA is colder than the South :)

A) The volume of hydrogen container is the same as the volume of the oxygen container. This statement is false for the given gases are at the same temperature and pressure.

According to the ideal gas law PV = nRT, the volume of a gas sample is proportional to the number of moles of the gas present, assuming that the pressure and temperature are constant. Since the number of moles of hydrogen is much less than the number of moles of oxygen (0.50 grams of hydrogen is roughly equivalent to 0.01 moles while 8.0 grams of oxygen is roughly equivalent to 0.2 moles), the volume of the hydrogen container would be much smaller than the volume of the oxygen container.

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two flexible containers for gases are at the same temperature and pressure. one holds 0.50 grams of hydrogen and the other holds 8.0 grams of oxygen. which of the following statement regarding these gas samples is false?

A)the volume of hydrogen container is the same as the volume of the oxygen container

B) the number of molecules in the hydrogen container is the same as the number of molecules in the oxygen container

C) the density of hydrogen sample is less than that of oxygen sample

D) the average kinetic energy of the hydrogen molecules is the same as the average kinetic energy of the oxygen molecules

E) The average speed of hydrogen molecules is the same as the oxygen molecules

Explanation:

a) m (metre)

b) mm (millimeter)

The pressure that is develops in the container when the water is reaches this higher temperature is 2.03 × 10³ psi.

According to the law of mass of conservation , wet :

Density (40 °C) × V = Density ( 100 °C ) × (V + ΔV)

ΔV/ V = ( Density (40 °C) / Density ( 100 °C ) ) - 1

ΔV/ V  = 1.940 / 1.927

ΔV/ V = 0.00675

The change in volume and bulk modulus relation given as :

K = - ΔP / ( ΔV/ V)

ΔP = - 300000 × - 0.00675

ΔP =  2.03 × 10³ psi

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Answer:  Consider the equilibrium of the generalized acid,  HX , in aqueous solution….

HX(aq)+H2O(l)⇌H3O++X−  

As we FACE the page, the given reaction, with FORMIC acid,  HC(=O)OH , produces ONLY millimolar concentration with respect to hydronium ion, and acetate ion … and thus, as anticipated, formic acid is a WEAK acid…. pKa=3.79 .

i.e.  Ka=(0.004∙mol∙L−1)20.10∙mol∙L−1−0.004∙mol∙L−1=1.60×10−4  

pKa=−log10(1.60×10−4)=−(−3.79)=+3.79  

….formic acid is nevertheless a STRONGER acid than acetic acid, for which  pKa=+4.76 .

Explanation:

Answer:

\(\small \boxed{ \sf \: Energy \: of \: photon \: is \: 1.5514 \times {10}^{ - 19} \: joules}\)

Explanation:

Given:

Wavelength (λ) = 1282 nm= 1.282 × 10-⁶ m

planks constant (h) = 6.626 × 10–³⁴ J⋅s

To find:

Energy (E) = ?

Solution:

In Quantum Mechanics the relationship between Energy & wavelength is given

\(E = \frac{hc}{ \lambda} \)

Where E is energy in joules

c is speed of light in m/s ( 3 × 10⁸ m/s)

λ is wavelength photon in meter

Substituting the given data & constant values,

\(E = \frac{hc}{ \lambda} \\ \\ E = \frac{6.63 \times {10}^{ - 34} \times 3 \times {10}^{8} }{1.282 \times {10}^{ - 6} } \\ \\ E = \frac{19.89}{1.282} \times {10}^{ (- 34 + 8+ 6)} \\ \\ E =15.514 \times {10}^{ - 20} \\ \\ \boxed{\sf E =1.5514 \times {10}^{ - 19} \: joules}\)

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Answer: B.) Ionic

Explanation: It is B because it is the type of bond that is most likely being presented in row 1.

A covalent bond is most likely being represented in row 1. Hence, option D is correct.

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.

The covalent bond is formed by the mutual sharing of valence electrons of one atom with the valence electrons of another atom. The covalent bond formed may be a single bond, a double bond or a triple bond.

If two electrons are shared between two atoms, then the single covalent bond is formed.

If four electrons are shared between two atoms, then a double bond is formed.

If six electrons are shared between two atoms, then a triple bond is formed.

Covalent network compounds are not malleable or ductile as the covalent bonds do not allow the atoms to move.

Hence, option D is correct.

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The frequency of light if radiated by an electron moving from orbit n1=2 n1=2 to n2=1n2=1 inside of a He ion is 8.2295 x 10⁶ m⁻¹.

The frequency of light fff radiated by an electron moving from orbit n1=2n1=2 to n2=1n2=1 inside of a he he ion can be found using the Rydberg formula.

The Rydberg constant, denoted by the symbol R∞, is a fundamental constant in physics that appears in the formula describing the wavelengths of spectral lines in the hydrogen atom. It is named after the Swedish physicist Johannes Rydberg, who extensively studied atomic spectra in the late 19th century. The Rydberg constant is a measure of the energy levels of electrons in an atom.

The formula for finding the frequency of emitted light is given by: f = R(1/n12−1/n22)f = R(1/n12−1/n22), where R is the Rydberg constant, n1 is the initial orbit and n2 is the final orbit. The Rydberg constant is equal to 1.0974 x 10⁷ m⁻¹. Substituting the given values into the formula, we get: f = 1.0974 x 10⁷ m⁻¹,  (1/2² − 1/1²)f = 1.0974 x 10⁷ m⁻¹ (1/4 − 1/1)f = 1.0974 x 10⁷ m⁻¹ (3/4)f = 8.2295 x 10⁶ m⁻¹.

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Answer:

Concept of chemi-fluorescence

Explanation:

A glow stick usually consists of two chemicals in a larger plastic tube: , a base catalyst (mostly sodium salicylate), and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction when mixed together.

When a glow stick is bent, the flurophor which is a chemical that easily re-emits light upon excitation in smaller capsules is released into the other substance, there by causing it to emit radiation/light in the uv-visible region. The brightness and longevity of the glow stick is determined by varying the concentration of these chemicals.

I hope this explanation clarifies things.