When a substance undergoes a chemical reaction in a closed system, which of the following will NOT change? (select all that apply)
temperature
energy
density
mass

Answer:

86.85°C

Explanation:

K = °C + 273.15

360K − 273.15 = 86.85°C ≈ 87°C

Answer:

If there are more products than reactants, that means the reaction has shifted towards the left, which is the backward direction. If there are more reactants than products, that means the reaction has shifted towards the right, which is the forward direction.

Answer:

See explanation

Explanation:

a) Benzamide from benzene

For this synthesis, we have to start with the Friedel-Crafts reaction to produce Toluene. Then with a strong oxidant, we can produce benzoic acid. In the next step, we can use an esterification reaction to produce the methyl benzoate. Finally, we can use an acyl substitution reaction using ammonia to produce the benzamide.

b) From bromocyclohexane to cyclohexyl methyl ketone

In this case, we can start with a Grignard reaction. The first step is to produce the Grignard reagent with using magnesium. Then if we add acetaldehyde we can form an alcohol, 1-cyclohexylethan-1-ol. Finally, we can reduce the alcohol to produce cyclohexyl methyl ketone.

See figure 1

I hope it helps!

Answer:

PLZZ like it tuk me to long to explan

Explanation:

The reaction between zinc and sulfur can be shown in what is called a chemical equation .  In words, we could write the reaction as:

zinc + sulfur → zinc sulfide

The more convenient way to express a chemical reaction is to use the symbols and formulas of the substances involved:

Zn + S → ZnS

The substance(s) to the left of the arrow in a chemical equation are called reactants.  A reactant is a substance that is present at the start of a chemical reaction.  The substance(s) to the right of the arrow are called products .  A product is a substance that is present at the end of a chemical reaction.  In the equation above, the zinc and sulfur are the reactants that chemically combine to form the zinc sulfide product.

There is a standard way of writing chemical equations.  The reactants are all written on the left-hand side of the equation, with the products on the right-hand side.  An arrow points from the reactants to the products to indicate the direction of the reaction:

reactants → products

When appropriate, a symbol may be written above or below the arrow to indicate some special circumstance.  The symbol “Δ” is often used to indicate that the reaction is to be heated.

The presence of the arrow also indicates that the reaction goes in one direction under the conditions indicated.  There are reactions which can be easily reversed, but we will not take those up right now.

There are a wide variety of reactions possible: elements may form compounds (as seen in the reaction above), compounds may form elements (water will break down in the presence of an electric current to form hydrogen gas and oxygen gas) or compounds may combine, break apart, or rearrange to form new materials.

Answer:

0.06654345229738384 moles of chromium.

Answer:

301.15 K

Explanation:

We would expect to measure a pressure of approximately 75.25 kPa for the gas in the container at the higher temperature of 267 oC.

To determine the expected pressure of the gas in the container at the higher temperature, we can use the combined gas law, which relates the initial and final conditions of temperature and pressure in a fixed volume system. The combined gas law equation is given as:

(P1 * V1) / T1 = (P2 * V2) / T2

Where:

P1 = Initial pressure

V1 = Initial volume (which is fixed in this case)

T1 = Initial temperature

P2 = Final pressure (to be determined)

V2 = Final volume (which is fixed in this case)

T2 = Final temperature

In this scenario, the initial conditions are given as 3 oC (which is equivalent to 276 K) and 38.5 kPa. The final temperature is 267 oC (which is equivalent to 540 K). Since the volume is fixed, we can substitute the given values into the equation:

(38.5 kPa * V1) / 276 K = (P2 * V1) / 540 K

Simplifying the equation, we can cancel out V1:

38.5 / 276 = P2 / 540

Solving for P2:

P2 = (38.5 / 276) * 540 ≈ 75.25 kPa

Therefore, we would expect to measure a pressure of approximately 75.25 kPa for the gas in the container at the higher temperature of 267 oC.

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Answer: B. 430 K

Explanation:

According to Gibb's equation:

\(\Delta G=\Delta H-T\Delta S\)

\(\Delta G\) = Gibbs free energy  

\(\Delta H\) = enthalpy change  = +62.4 kJ/mol

\(\Delta S\) = entropy change  = +0.145 kJ/molK

T = temperature in Kelvin

\(\Delta G\)  = +ve, reaction is non spontaneous

\(\Delta G\)  = -ve, reaction is spontaneous

\(\Delta G\)  = 0, reaction is in equilibrium

\(\Delta H-T\Delta S=0\) for reaction to be spontaneous

\(T=\frac{\Delta H}{\Delta S}\)

\(T=\frac{62.4kJ/mol}{0.145kJ/molK}=430K\)

Thus the Reaction is spontaneous when temperature is 430 K.

Answer:

430 K

Explanation:

i just took the test on a pex :)

B.) have a better chance of colliding with other atoms.

If concentrations are measured in M and time in seconds, M³s⁻³ is the units for the rate constant, , for the rate law, Rate=[A][B]².

The rate of the reaction or rate of the reaction is the rate at which an chemical reaction occurs, defined as proportionate to the rise in product concentration per unit time and the reduction in reactant concentration per unit time.

The speeds of reaction might vary greatly. For example, oxidative corrosion of iron in the Stratosphere is a slow reaction that really can take several years, but cellulose combustion in a fire occurs in fractions of a second.

Rate=[A][B]²

        =  Ms⁻¹×M²s⁻²

       = M³s⁻³

Therefore, M³s⁻³ is the units for the rate constant, , for the rate law,  Rate=[A][B]².

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Answer:

9 protons, 10 neutrons, and 9 electrons.

Explanation:

The particles of the nucleus of an atom of Fluorine-19 is

9 protons, 10 neutrons, and 9 electrons.

Answer:

Fluorine-19 is composed of 9 protons, 10 neutrons, and 9 electrons.

Answer:

strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other.

Explanation:

In liquids, the attractive intermolecular forces are strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other.

Intermolecular forces are the forces of repulsion or attraction.

Intermolecular forces lie between atoms, molecules, or ions. Intramolecular forces are strong in comparison to these forces.

In liquids, the attractive intermolecular forces are strong enough to hold

molecules relatively close together but not strong enough to keep

molecules from moving past each other.

Liquid is a state of matter in which the atoms are relatively close to each

other but less than that of solids which are densely and tightly packed.

The intermolecular force in liquids are strong enough to hold them together

which makes them less easily compressible but not strong enough to keep

them from moving or gliding past each other because they aren't tightly

packed.

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Answer:

229%

Explanation:

The equation of the reaction is;

4Al(s) + 3O2(g) ----> 2Al2O3(s)

We must first determine the limiting reactant;

Number of moles of Al2O3 produced = mass/molar mass = 72.4g/101.96 g/mol = 0.71 moles

For Al

Number of moles reacted = mass/molar mass = 49.2g/27 g/mol = 1.8 moles

If 4 moles of Al yields 0.71 moles of Al2O3

1.8 moles of Al will yield 1.8 × 0.71/4 = 0.32 moles of Al2O3

For O2

Number of moles reacted = mass/molar mass = 42.6g/32g/mol = 1.33 moles

If 3 moles of O2 yields 0.71 moles of Al2O3

1.33 moles of O2 will yield 1.33 × 0.71/3 = 0.31 moles of Al2O3

Oxygen is the limiting reactant.

% yield = actual yield/ theoretical yield × 100/1

% yield = 0.71 moles/0.31 moles × 100

% yield = 229%

Answer:

when a gas dissolves in a liquid, it causes decompreession

Decompression causes the gas in a liquid to expand.

Answer:

Lithium oxide, Li₂O.

Explanation:

Hello!

In this case, according to the given amounts, it is possible to write down the chemical reaction as shown below:

\(M_2O+H_2 \rightarrow 2M+H_2O\)

Which means that the metallic oxide has the following formula: M₂O. Next, we can set up the following proportional factors according to the chemical reaction:

\(5.00gM_2O*\frac{1molM_2O}{(2x+16)gM_2O}*\frac{2molM}{1molM_2O}*\frac{xgM}{1molM} = 2.32gM\)

Thus, we perform the operations in order to obtain:

\(\frac{10x}{2x+16}=2.32\)

So we solve for x as shown below:

\(10x = 2.32(2x+16)\\\\10x = 4.64x+37.12\\\\x = \frac{37.12}{10-4.64}\\\\x= 6.93 g/mol\)

Whose molar mass corresponds to lithium, and therefore, the metallic oxide is lithium oxide, Li₂O.

Best regards!

Answer:

first is cloud computing second is moores law third is biocomputing and the last one is quantum computing

Explanation:

The use of biological components like DNA to retrieve, process, and store data in the anticipated next generation of technologies that are expected to drastically increase processing capabilities are not possible.

DNA has a property by which it can replicate that si why said to be self-replicating material and always present in all living organisms few of them which cannot take but almost all.

DNA is the main constituent of chromosomes which is responsible to carry genetic information to the next generation and which cannot be used in computers as it is a natural thing controlled by nature only.

Therefore, the use of biological components like DNA to retrieve, process, and store data in the anticipated next generation of technologies that are expected to drastically increase processing capabilities are not possible.

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Algal blooms and high concentrations of nitrogen in water are effects of water pollution. Overgrazing and the use of chemical fertilizers cause water pollution.

Algal blooms are an effect of water pollution. They occur when there is an excessive amount of nutrients, particularly nitrogen and phosphorus, in the water due to pollution. The overgrowth of algae depletes the oxygen levels in the water, which can harm fish and other aquatic animals.

Overgrazing can cause water pollution by increasing the sedimentation rate of waterways. This sedimentation can carry nutrients, bacteria, and other pollutants into the water, which can degrade water quality and cause harm to aquatic life.

The use of chemical fertilizers to enhance production is a cause of water pollution. When fertilizer is overused, it can leach into waterways and cause nutrient pollution, which can lead to algal blooms and other forms of water pollution.

High concentrations of nitrogen in water are often an effect of water pollution. This can be caused by the overuse of fertilizers or the discharge of untreated sewage into waterways. High nitrogen levels can cause algal blooms, which can lead to oxygen depletion and harm aquatic life.

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Answer:

Cause:

: : use of chemical fertilizers to enhance production

: : overgrazing

Effect:

: : high concentration of nitrogen in water

: : algal blooms

Hope this helps ;)

Answer:

Option B. Heptane

Explanation:

To obtain the parent name of the above compound, all we need to do is to locate the longest continuous carbon chain.

The longest continuous carbon chain of the above compound is 7.

Next, we shall also consider the chain if there is any double or triple bond.

From the diagram given above, no double or triple bond is present.

Finally, the parent name of the compound is heptane since the longest continuous carbon chain is 7 and no double or triple bond is present in the compound.

The correct formula : BeSO₄

Chemical formula shows the composition number of the constituent atoms

Polyatomic ion consists of 2 or more ions

The equal charge of the two ions will cancel each other out, while the different charges of the two ions will be crossed each other

Be²⁺ (monatomic ion) has a positive charge of +2, while SO₄²⁻ (polyatomic ion) has a negative -2 charge, so that the two charges with the same magnitude but with different charges cancel each other out so that the compound form is BeSO4

Answer:

1.-213(kcal/mol)*5mol=1065kcal

2.100/213 mol

a. The energy released from 5.0 mol of methane is -1065 kcal/mol.

b. The number of moles of methane needed to give 100. kcal heat is 0.4694 moles.

Combustion is a chemical process in which the element reacts with oxygen to produce heat and light. Burning of wood.

The equation of combustion of methane:

CH₄ (g) + 2O₂(g) ------> CO₂ (g) + 2H₂O (l)

a) Enthalpy of the reaction is H = -213 Kcal/mol

This means 213 Kcal heat is released in the burning of one mole of CH4

H reaction = [ H products ] - [ H reactants ]

Hr = [ H(CO₂)g + 2H(H₂O)l ] - [ H(CH₄)g ] = -213 kcal/mol

For 5 moles of methane:

5CH₄(g) + 10O₂(g) -----> 5CO₂(g) + 10H₂O(l)

therefore, new Hr = 5 x -213 = -1065 kcal/mol

H reaction = -1065 kcal/mol

b) 213 kcal is released per mole of Methane

then, to release 100 kcal we need, 100 / (213) = 0.4694 moles

Thus, the energy released is -1065 kcal/mol, and the number of moles is 0.4694 moles.

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Answer:

Mn= +3 charge

Explanation:

if you take what we know, and that would be the charge of oxygen, we know that oxygen has a 2- charge and there are 3 sets of O^2-  so multiply the number of oxygen times the charge and you get 6-.

Next set up an equation as listed in the picture  which will be 2(x)=6

and that is the charge of the Mn ion.

Molar mass P2O5 = 31 x 2 + 16 x 5 => 142 g/mol

142 g ---------------- 6.02 x 10²³ molecules

0.930g g ------------ ( molecules )

molecules = 0.920 x ( 6.02 x 10²³ ) / 142

molecules = 5.53 x 10²³ / 142

= 3.89 x 10²¹ molecules

1 molecule P2O5 -------------------------- 7 atoms

3.89 x 10²¹ molecules -------------------- ( atoms )

atoms = ( 3.89 x 10²¹) x 7 / 1

atoms = 2.72 x 10²² atoms of P2O5

2.72 x 10²² atoms of P₂O₅ are there in 0.930 g of  P₂O₅.

Molar mass P₂O₅ = 31 x 2 + 16 x 5 => 142 g/mol

142 g atoms are present in 6.02 x 10²³ molecules

Therefore, total number of molecules in 0.930g of atoms is calculated as-

molecules = 0.930 x ( 6.02 x 10²³ ) / 142

molecules = 5.53 x 10²³ / 142

= 3.89 x 10²¹ molecules

1 molecule of P₂O₅ contains 7 atoms

Therefore, the number of atoms in 3.89 x 10²¹ molecules is calculated as

atoms = ( 3.89 x 10²¹) x 7 / 1

atoms = 2.72 x 10²² atoms of  P₂O₅

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Answer:

25.82°C

Explanation:

Based on the reaction, 1 mole of HCl and 1 mole of NaOH reacts, that means the reaction is 1:1. The moles of each compound are:

Moles HCl:

0.025L * (0.144mol/L) = 0.0036 moles HCl

Moles NaOH:

0.020L * (0.132mol/L) = 0.00264 moles NaOH

Thus, moles of reaction are 0.00264 moles

The heat released in a calorimeter is obtained using the equation:

Q = m*c*ΔT

Where Q is heat released in the reaction:

0.00264 moles * (-57.62kJ/mol) = 0.1521kJ = 152.1J of reaction

m is mass of the solution:

25.0mL + 20.0mL = 45mL * (1.04g/mL) = 46.8g

c is specific heat of the solution:

3.93J/gºC

And ΔT is change in temperature.

Solving for ΔT:

Q /mc = ΔT

151.2J / 46.8g*3.93J°C = 0.82°C = ΔT = Final temperature - Initial temperature.

Final temperature = 0.82°C + 25°C =

Answer:

it is a acid. the answer is acid

Answer: The reaction requires breaking one O=O bond and two H-H bonds, and then forming four O-H bonds.

The percent by mass of the fluorine in the compound is 46.472%.

We know that the percent by mass has to do with the ratio of the total mass of the atom that is part of the compound and the total molar mass of the compound multiplied by one hundred.

The question in this case has demanded that we ought to obtain the mass percent of fluorine from the compound that we can be able to identify from the formula of the compound that is shown here as xenon hexa fluoride.

Mass of the compound can be obtained from; 131 + 6(19)

= 245 g/mol

The total mass of the fluorine atom in the compound is 114 g

Thus we have the use of;  114 /245 * 100/1

= 46.472%

The percent  by mass is now gotten for the fluorine atom as 46.472%.

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Answer:

C5H12 + 8O2 --> 5CO2 + 6H2O

Explanation:

Complete question

Write a balanced chemical equation to represent the combustion of CH3CH2CH2CH2CH3

Solution

The given compound is pentane

C5H12

The empirical equation representing combustion of pentane is

C5H12 + O2 --> CO2 + H2O

We will first balance the carbon atoms

C5H12 + O2 --> 5CO2 + H2O

Now we will balance the Hydrogen molecule

C5H12 + O2 --> 5CO2 + 6H2O

Now we will balance the oxygen molecule

C5H12 + 8O2 --> 5CO2 + 6H2O