sodium hydroxide (naoh) has a lattice energy of -887 kj>mol and a heat of hydration of -932 kj>mol. how much solution could be heated to boiling by the heat evolved by the dissolution of 25.0 g of naoh? (for the solution, assume a heat capacity of 4.0 j>g

Four aluminum samples are each reacted with separate 1m copper sulfate solutions under the same conditions of temperature and pressure.So all aluminum sample will react with same rate.

The following factors affect rate of reaction.

concentration of reactants, Pressure, Temperature, Catalyst, Nature of reactants, exposure of reacting species, Surface area, Intensity of light.

If all sample of aluminum are reacted with copper sulfate solution under same conditions, then all samples will react with same rate.

In general, adding the attention of a reactant in result, adding the face area of a solid reactant, and adding the temperature of the response system will all increase the rate of a response. A response can also be sped up by adding a catalyst to the response admixture.

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Answer:47.05% is the percent yield of nitrogen in the reaction.

Explanation:

heoretical yield of nitrogen gas = x

Moles of ammonia =  

According to reaction,2 moles of ammonia gives 1 mol of nitrogen gas.

Then 2.3529 mol of ammonia will give:

of nitrogen gas

Mass of 1.1764 moles of nitrogen gas,x = 1.1764 mol × 28 g/mol=32.94 g

Experiential yield of nitrogen gas = 15.5 g

Percentage yield:

hope that help

47.05% is the percent yield of nitrogen in the reaction.

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Full Question

an unknown compound has the formula . you burn 0.2236 g of the compound and isolate 0.5459 g of and 0.2235 g of . what is the empirical formula of the

Therefore, the masses of each substance are approximately: Pyrex glass: 38.69 g,Sand: 36.17 g,Ethanol: 40.33 g,Water: 23.27 g

To solve this problem, we can use the specific heat formula:

q = mcΔT

where:

q is the heat absorbed (1970 J in this case),

m is the mass of the substance,

c is the specific heat capacity of the substance, and

ΔT is the change in temperature (final temperature - initial temperature).

We need to rearrange the formula to solve for the mass (m):

m = q / (cΔT)

We'll calculate the mass for each substance using their respective specific heat capacities and temperature changes.

For Pyrex glass:

Specific heat capacity of Pyrex glass = 0.840 J/g⋅°C (from the reference)

Temperature change (ΔT) = (55.1 - 21.0) °C

m(Pyrex) = 1970 J / (0.840 J/g⋅°C * (55.1 - 21.0) °C)

m(Pyrex) ≈ 38.69 g (rounded to two significant figures)

For sand:

Specific heat capacity of sand = 0.830 J/g⋅°C (from the reference)

Temperature change (ΔT) = (62.3 - 21.0) °C

m(sand) = 1970 J / (0.830 J/g⋅°C * (62.3 - 21.0) °C)

m(sand) ≈ 36.17 g (rounded to two significant figures)

For ethanol:

Specific heat capacity of ethanol = 2.44 J/g⋅°C (from the reference)

Temperature change (ΔT) = (44.0 - 21.0) °C

m(ethanol) = 1970 J / (2.44 J/g⋅°C * (44.0 - 21.0) °C)

m(ethanol) ≈ 40.33 g (rounded to two significant figures)

For water:

Specific heat capacity of water = 4.18 J/g⋅°C (from the reference)

Temperature change (ΔT) = (32.4 - 21.0) °C

m(water) = 1970 J / (4.18 J/g⋅°C * (32.4 - 21.0) °C)

m(water) ≈ 23.27 g (rounded to two significant figures)

Therefore, the masses of each substance are approximately:

Pyrex glass: 38.69 g

Sand: 36.17 g

Ethanol: 40.33 g

Water: 23.27 g

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The aluminium sample that would react most rapidly with the copper sulfate solution under the same conditions of temperature and pressure would be the powder.

Thus, the correct answer is the powder (C).

The powder hаs the lаrgest surfаce аreа аvаilаble for reаction, аllowing for more collisions between the аluminum аtoms аnd the copper sulfаte solution. The copper sulfаte is аn inorgаnic compound thаt combines sulfur with copper. The greаter the surfаce аreа, the fаster the reаction rаte. Therefore, the powder would reаct most rаpidly compаred to the pellets, grаm, or ribbon.

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Answer: 475 ml is needed

Explanation:

(a) To get the pH of the media to 5.8, you would add NaOH solution. NaOH is used as a basic solution, and when it is added to a solution, it will increase the pH of the solution.

(b) The molecular weight of BA is 225.3. To prepare a 1M solution, you would have to weigh out 225.3 grams of BA.(c) To convert a 1M solution of BA to mg/mL, you can use the following equation: 1 mole = molecular weight in grams; 1000 millimoles = 1 mole. So, 1 M = 1000 mg/mL. Therefore, a 1M solution of BA is equivalent to 1000 mg/mL .(d) To convert a concentration of 1000 mg/mL .

Therefore, to calculate the weight required for a 5 mM solution, use the following formula :Mass of BA = molarity × volume × molecular weight= 5 × 0.001 × 225.3= 1.1265 grams(f) To convert a concentration of 5 mM to mg/mL, we use the following formula: Concentration (mg/mL) = (Concentration (mM) × Molecular weight) / 1000= (5 × 225.3) / 1000= 1.1265 mg/mL(g)

To convert a concentration of 1.1265 mg/mL to mg/L, we multiply by 1000, so 1.1265 mg/mL = 1126.5 mg/L.(h) Given that the stock solution of BA is 5 mM and the working solution is 0.2 mg/mL.

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Answer: D

Explanation:

Reduction involves the gaining of electrons.

However, charge must be balanced, and this is not the case for choice B, but it is the case for choice D

Answer:

how ston age humans made hand areas

Clostridium botulinum  produces a deadly toxin that may be found in improperly home-canned, low-acid foods. Under low oxygen circumstances, the bacterium Clostridium botulinum creates harmful toxins (botulinum toxins). Botulinum toxins are among the deadliest chemicals yet discovered. Botulinum toxins can cause respiratory and muscle paralysis by blocking nerve functioning.

A toxin that targets the body's nerves and produces botulism, an uncommon but severe illness, can cause difficulties breathing, muscle paralysis, and even death. The bacteria Clostridium botulinum, as well as Clostridium botulinum and Clostridium baratii, occasionally produce this toxin. The anaerobic rod-shaped spore-forming bacteria Clostridium botulinum produces a protein with distinctive neurotoxicity.

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Answer:

6.25

Explanation:

Because 2.5 is half and idk know how to explain but  yeah

Recrystallization is a common technique used to purify solid compounds by dissolving them in a solvent at high temperature, and then allowing the solution to cool slowly to form crystals.

The solvent should have the following properties:

The solubility of the compound should be high at high temperature and low at low temperature. This allows the compound to dissolve completely at high temperature and then precipitate out as pure crystals at low temperature.

The solvent should be relatively volatile and have a low boiling point, so that it can be easily removed from the recrystallized solid by evaporation or vacuum filtration.

The solvent should not react with the compound being recrystallized, so that it does not introduce impurities into the final product.

The effectiveness of the recrystallization solvent can be evaluated based on the percent recovery and purity of the recrystallized solid. The percent recovery is the percentage of the original compound that is recovered after recrystallization, and it is a measure of how efficient the recrystallization process was. A high percent recovery indicates that the recrystallization was successful in purifying the compound, while a low percent recovery may indicate that the solvent was not suitable for the compound or that the recrystallization conditions were not optimized.

The purity of the recrystallized solid is a measure of how free it is from impurities. The purity can be determined by comparing the melting point of the recrystallized solid to the known melting point of the pure compound. If the melting point of the recrystallized solid is close to the known melting point of the pure compound, then the recrystallization was successful in purifying the compound. If the melting point is lower or broader than the known melting point, then there may be impurities present in the recrystallized solid.

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When mixing two or more incompatible pesticides, the result could be reduced effectiveness, chemical reactions, or physical changes in the pesticide mixture.

Incompatible pesticides may not mix well, leading to reduced efficiency in controlling pests.

They may also cause chemical reactions that produce hazardous byproducts or make the pesticides less effective. Furthermore, physical changes in the pesticide mixture, such as clumping or separation, can occur, making it difficult to apply evenly.

Summary: Mixing incompatible pesticides can result in reduced effectiveness, chemical reactions, and physical changes, negatively impacting their ability to control pests.

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Answer:

Neither? If it must be one then fission.

Explanation:

I actually didn't know they had fission, but I can absolutely gaurantee that they don't use fusion, nuclear fusion is a process that fuses hydrogen atoms together and releases a massive amount of energy, it used in hydrogen bombs and by our sun. It's a process that needs a massive amount of energy to kickstart and there's no way that technology would fit in a tanning bed. If I'm wrong then please tell me.

Hope this is a good answer.

1. The illustration is potential energy

2. The amount of energy, given that the bell weighs 900 N is 82800 J

Potential energy is the energy possesed by an object by virtue of it's location. While kinetic energy is the energy of a moving object.

From the above information, we can conclude that the illustration from the question is potential energy

The amount of energy can be obtained as follow:

Energy = Force × height

Energy = 900 × 92

Energy = 82800 J

Thus, we can conclude that the energy is 82800 J

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Answer:

it have been already balanced

2H2 + O2 = 2H2O.

Answer:

12.5 mL NH₃

Explanation:

To find the volume of NH₃, you need to (1) find the moles (NH₄)₂PtCl₄ (using the molarity equation), then (2) convert moles (NH₄)₂PtCl₄ to moles NH₃ (via mole-to-mole ratio from balanced equation, and then (3) find the volume NH₃ (using the molarity equation).

(Step 1)

25.00 mL / 1,000 = 0.025 L

Molarity = moles / volume (L)

0.100 M = moles / 0.025 L

0.0025 = moles (NH₄)₂PtCl₄

(Step 2)

The unbalanced equation:

(NH₄)₂PtCl₄ + NH₃ ----> Pt(NH₃)₂Cl₂ + NH₄Cl

Reactants: 2 nitrogen, 11 hydrogen, 1 platinum, 4 chlorine

Products: 2 nitrogen, 10 hydrogen, 1 platinum, 3 chlorine

The balanced equation:

(NH₄)₂PtCl₄ + 2 NH₃ ----> Pt(NH₃)₂Cl₂ + 2 NH₄Cl

Reactants: 3 nitrogen, 14 hydrogen, 1 platinum, 4 chlorine

Products: 2 nitrogen, 14 hydrogen, 1 platinum, 4 chlorine

0.0025 moles (NH₄)₂PtCl₄              2 moles NH₃
----------------------------------------  x  ------------------------------  =  0.0050 moles NH₃
                                                      1 mole (NH₄)₂PtCl₄

(Step 3)

Molarity = moles / volume (L)

0.400 M = 0.0050 moles / volume

(0.400 M) x volume = 0.0050 moles

volume = 0.0125 L NH₃

0.0125 L x 1,000 = 12.5 mL NH₃

The enthalpy change (ΔH) for the physical change of Br2 from the gas phase to the gas phase (Br2(g) → Br2(g)) is zero. The entropy change (ΔS) for this physical change is also zero.

In a physical change, the chemical substance remains the same, and there is no breaking or forming of chemical bonds. In the case of Br2 going from the gas phase to the gas phase, there is no change in the chemical identity or composition of the substance.

The enthalpy change (ΔH) measures the heat energy transfer during a reaction or process. Since there is no change in the chemical bonds or composition of Br2 in this physical change, there is no transfer of heat energy, and thus ΔH is zero.

The entropy change (ΔS) quantifies the degree of disorder or randomness in a system. In this physical change, the arrangement and distribution of Br2 molecules remain unchanged, leading to no change in entropy. Therefore, ΔS is also zero.

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We first need to understand what serial dilutions are. Serial dilutions involve a series of dilutions where a small amount of a concentrated solution is added to a larger volume of solvent to produce a less concentrated solution. This process is repeated several times until the desired concentration is achieved.

In this case, the researcher added 1 ml of the 3.4 m chemical to 1 ml of water four times, resulting in a total dilution factor of 1:16 (2^4). This means that the final concentration of the chemical in the diluted solution is 3.4 m/16 = 0.2125 m. Therefore, the concentration of the chemical in the final dilution is 0.2125 M (rounded to the nearest 4th decimal place).

It's important to note that when working with solutions, it's essential to understand concentration and how to perform dilutions accurately. Dilutions are commonly used in scientific research, especially in fields like biochemistry, microbiology, and chemistry. They are used to prepare standards, control samples, and calibrators for analytical methods, among other applications.

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Answer:

repulsion

Explanation:

Answer:

Explanation:

In contrast to the attractive force between two objects with opposite charges, two objects that are of like charge will repel each other. ... Similarly, a negatively charged object will exert a repulsive force upon a second negatively charged object. Objects with like charge repel each other.

Answer:

The smallest atom you have listed would be lithium (Li).  

Explanation:

Lithium is the third smallest atom listed on the periodic table of the elements.  It has an atomic number of three, meaning it has three protons in it's nucleus.

Atom size (Atomic radius) increases from UP to DOWN in the same COLUMN(group) of the periodic table. For example, in the first group, the Atomic radius trend from smallest to greatest is: H (smallest) -- Li  -- Na -- K -- Rb -- Cs -- Fr (greatest).

Reason is, the increasing energy level (increases from n=1 to n=7) causes the shielding effect increase dramatically. And since the size of atom is mostly consist of electrons, more energy level is filled, the larger the atom will be.)

However, in the same ROW from left to right, the atomic size decreases as the number increases.   For example, Li #3, is larger than Flourine (F) with an atomic number 9 because they are on the same ROW.

Answer:

Bias can cause the results of a scientific study to be disproportionately weighted in favor of one result or group of subjects. This can cause misunderstandings of natural processes that may make conclusions drawn from the data unreliable.

Explanation:

Answer:

9 x 10^3 + 2.3 x 10^4

Scientific notation

3.2·10^4

Expanded form

32000

Answer:

It contains 24 neutrons.

Explanation:

Mass number = Protons + Neutrons

If you were to have 24 neutrons, the mass number would be 36, invalidating the known information. You have 12 protons and 12 neutrons to form a mass number of 24. Remember that your protons are the same thing as the atomic number, so you can make an equation using your known information to derive true statements.

The amount of heat absorbed in the complete reaction of 3.00 grams of SiO2 with excess carbon can be calculated using the given DH0 value for the reaction. The correct answer is option D: 1.33 ´ 104 kJ.

To calculate the heat absorbed in the reaction, we need to use the given DH0 value and the stoichiometry of the reaction. According to the balanced equation, 1 mole of SiO2 reacts with 3 moles of C to produce 1 mole of SiC and 2 moles of CO.

First, we need to calculate the moles of SiO2 in 3.00 grams using its molar mass. The molar mass of SiO2 is approximately 60.08 g/mol. Therefore, 3.00 grams of SiO2 is equal to 3.00 g / 60.08 g/mol = 0.04996 mol.

Next, we can use the DH0 value of +624.6 kJ to calculate the heat absorbed in the reaction. Since 1 mole of SiO2 is involved in the reaction, the heat absorbed can be calculated as follows:

Heat absorbed = DH0 × moles of SiO2

= +624.6 kJ/mol × 0.04996 mol

≈ 1.33 ´ 104 kJ

Therefore, the correct answer is option D: 1.33 ´ 104 kJ, representing the amount of heat absorbed in the complete reaction of 3.00 grams of SiO2 with excess carbon.

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Answer:

Q = 450 J

Explanation:

Given that,

Mass of a piece of glass, m = 45 g

The temperature changes from 10°C to 30°C.

The specific heat is 0.5 J/g°C

We need to find heat required to raise the temperature. The formula that is used to find it is given by :

\(Q=mc\Delta T\\\\Q=45\times 0.5\times (30-10)\\\\Q=450\ J\)

So, the required heat is 450 J. Hence, the correct option is (c).

Answer:

The answer is biochemistry

Explanation:

Biochemistry is a field of science that studies the chemistry and chemical processes involved in a living system. These chemical processes include glycolysis, gluconeogenesis, citric acid cycle, pentose phosphate pathway among others. Biochemistry studies the relatedness of these processes, the importance of these processes and how these processes can or cannot be regulated.

Answer:A

Explanation:

Move the decimal forward 3 times.

Answer:

The pH scale ranges from 0-14.

Explanation:

Zero is the most acidic measurement while six would be the least acidic of the acids, seven is a pure substance, neither acidic nor basic, eight is the least basic measurement while 14 is the most basic of the bases.