AJUTOR VA ROG AM TEST SI MAI AM 10 MINUTE AM NEVOIE DE SUBPUNCTUL C SI D

To raise the temperature of a 10.35g sample of carbon tetrachloride from 32.1°c to 56.4°c, 222.92J heat is required.

Heat is a form of energy and it is associated with the motion of particles. The amount of heat required to change the temperature of a substance depends on its mass, the specific heat capacity of the substance and the change in temperature.

The mass of carbon tetrachloride is given as 10.35g. The specific heat capacity of carbon tetrachloride is given as 0.85651 J/g°C and the change in temperature is given as 24.3°C. Putting these values into the formula: q = m × C × ΔTq = 10.35 g × 0.85651 J/g°C × 24.3°Cq = 222.92 J. Therefore, 222.92 Joules of heat are required to raise the temperature of a 10.35g sample of carbon tetrachloride from 32.1°c to 56.4°c.

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The oxidation values of the reactants in the equation 4NH3 + 5O2 —> 4NO + 6H2O are -3 for NH3, 0 for O2, and +2 for NO and 0 for H2O. The oxidising agent is O2, which acquires electrons to generate H2O, and the reducing agent is NH3, which loses electrons to form NO.

Thus, the electrons gained by O2 are 6 and the electrons lost by NH3 are 8. The oxidation number of nitrogen in NH3 is -3 since hydrogen has an oxidation number of +1 and the total charge of the molecule is 0. Similarly, the oxidation number of oxygen in O2 is 0 since O2 is a neutral molecule.

The nitrogen oxidation number in the products Because hydrogen has an oxidation number of +1, the oxidation number of nitrogen in NO is +2, and the oxidation number of oxygen in H2O is -2.

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The stock solution's starting concentration was 6.198 M. (rounded to 3 decimal places).

Dilution is the process in question. The concentrations and volumes before and after a dilution can be related using the equation below: Where M1 and V1 represent the volume and molarity, M1V1 equals M2V2. of the final diluted solution, while M2 and V2 are the molarities of the initial concentrated solution, respectively.

C1V1 = C2V2

where:

C1 represents the stock solution's starting concentration.

V1 is the used stock solution's volume.

C2 indicates the diluted solution's final concentration.

V2 is the diluted solution's final volume.

C1(48 mL) = (2.5 M)(119 mL)

C1 = (2.5 M)(119 mL) / (48 mL)

C1 = 6.19792 M (rounded to 3 decimal places)

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Answer:

False

Explanation:

A phase change does not involve changing the identity or makeup of that species. When you take solid ice and melt it (add enough energy to it) it changes to water, which is now a liquid. ... A chemical change would involve reactions taking place that would change the whole identity of that species.

I hope this helps!

Answer:

55°C

Explanation:

original is 20

after gaining heat is 75

75 - 20 = 55

Answer:

17242,5J

Explanation:

Given parameters:

Mass of water  = 75g

Initial temperature  = 20°C

Final temperature  = 75°C

Unknown:

Amount of heat absorbed  = ?

Solution

To find the amount of heat absorbed by water;

      H  = mcΔt

 m is the mass

  c is the specific heat capacity of water  = 4.18J/g°C

 Insert the parameters and solve;

       H  = 75 x 4.18 x (75 - 20)

       H  = 17242,5J

Answer:

The hot water was better for removing the oil.

Explanation:

You can see that because the mass went down more with the hot water. So, that means that more oil was taken out of the feather with hot water.

Answer:

The mass changed from 1.1grams to 4.5 grams. The appearance is another thing that changed when it got dipped in oil. The feather look like it lost some feathers or the feathers became transparent. The feather just looks soggy and heavier overall.  I believe that if Natalia dips the feather covered in oil in cold water, the feather will remain the same. If she were to dip it in hot water, the feather will get rid of the oil mostly. Think about it, in the ocean the water is cold right? So when oil spills in the ocean it will stay there. Hot water is the best to remove the oil from the feather.

Explanation:

Hopefully this will help.

The molar mass (g/mol) of an unknown gas q effuses 1.87 times as fast under the same conditions as Xe gas is  (√ y × 1.87)²

To determine the molar mass of the unknown gas, we use Graham's Law of effusion which relates the rate of the gases with their respective molar masses.

Here rate is the rate of effusion of the gas expressed in terms of number of mole per unit time or volume, and M is the molecular mass of the gas.  

Rate Q/Rate Xe = √M of Xe / √M of Q

Let , the molecular mass of Xe  is y grams per mole and M of Q is molecular mass of Q and based on the question Q needs 1.87 times more to effuse in comparison to Xe.

Therefore,

rate of Q = rate of Xe / 1.87

Now by substituting the values we get,  

rate of Xe / 1.87 / rate of Xe = √y / √M of Q

√M of Q = √ y × 1.87

M of Q = (√ y × 1.87)²

Therefore, molar mass of Q is  (√ y × 1.87)² g/mol

Let us consider, the molecular mass of Xe  is 20 grams per mole and M of Q is molecular mass of Q and based on the question Q needs 1.87 times more to effuse in comparison to Xe.

Therefore,

rate of Q = rate of Xe / 1.87

Now by substituting the values we get,  

rate of Xe / 1.87 / rate of Xe = √20/ √M of Q

√M of Q = √ 20 × 1.87

M of Q = (√ 20 × 1.87)²

Therefore, molar mass of Q is 69.9 g/mol

The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance equal to the number of moles in that sample, measured in moles.

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Answer:

7.07585×10^24 molecules

Explanation:

# of Moles X Avogadro's Number= # of  Molecules

According to the concept of Avogadro's number, there are 7.075×10²⁴ molecules in 11.75 moles of water.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number. Number of molecules is calculated as:number of moles×Avogadro's number

∴number of molecules= 11.75×6.022×10²³=7.075×10²⁴ molecules.

Thus, there are 7.075×10²⁴ molecules in 11.75 moles of water .

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Answer:

0.84kg of gatorade powder

Explanation:

From the question given, we were told that 0.6kg of gatorade powder required 5 gallons of water.

To obtain the mass of gatorade needed for 7 gallons of water, we simply do the following:

0.6kg of gatorade powder required 5 gallons of water.

Therefore, xkg of gatorade powder will require 7 gallons of water i.e

xkg of gatorade powder = (0.6 x 7)/5

xkg of gatorade powder = 0.84kg

Therefore, 0.84kg of gatorade powder will be required.

Answer:

here :). hope this helps.

The pH of the resulting solution when 479 mL of 0.4071 M HClO₄ is mixed with 415 mL sample of KOH (which has a pH of 14.03) is 16.72.

To find the pH of the resulting solution, we need to first calculate the moles of HClO₄ and KOH, then use the Henderson-Hasselbalch equation to find the pH.

1. Calculate moles of HClO₄:

Molarity = moles/volume

0.4071 M = moles/479 mL

moles = 0.4071 M * 479 mL = 0.195 mL

2. Calculate moles of KOH:

pH = -log[H+]

14.03 = -log[H+]

[H+] = 10^-14.03 = 9.1 x 10^-15

Molarity = moles/volume

Molarity = 9.1 x 10^-15 moles/415 mL = 2.2 x 10^-17 M

3. Use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

pH = -log(Ka) + log([KOH]/[HClO₄])

pH = -log(2.2 x 10^-17) + log(415/479)

pH = 16.66 + 0.06 = 16.72

Therefore, the pH of the resulting solution is 16.72.

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The murder took place approximately 851.2 years ago.

Based on the isotope's half-life, we must determine the age of the remains.

90% of the normal amount being present in the remains means that 0.90 of the isotope is still present.

The equation for radioactive decay can be used:

fraction remaining =\((1/2)^(^n^/^t^)\)

Where

We can rearrange the formula to solve for the number of half-lives (n):

n = (log base 0.5) (fraction remaining)

Using the given fraction remaining of 0.90:

n = (log base 0.5) (0.90)

n ≈ 0.152

Since the number of half-lives is a fraction, we can convert it to years by multiplying it by the half-life:

time elapsed = n * t

time elapsed ≈ 0.152 * 5600 years

time elapsed ≈ 851.2 years

So, the murder took place approximately 851.2 years ago.

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The mass of the sample is 18.3g

The total amount of matter in a physical body is known as mass. This property also measures inertia, or the body's resistance to acceleration (change of velocity) when a net force is applied. The mass of an object also affects the gravitational attraction it exerts on other bodies.

The kilogram is the fundamental mass unit of SI (kg). Although mass is frequently established by measuring an object's weight on a spring scale rather than a balancing scale and directly comparing it with known masses, mass and weight are not the same things in physics. Although there is less gravity on the moon than there is on Earth, an object would nonetheless have the same mass.

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If 2.5 g of glucose is dissolved in 0.5 dm3 of water, then the concentration of the solution will be 5 g/dm3, and the concentration of the solutes determines the concentration of the solution.

A solution is made up of both solutes and the solvent, and the amount of the solvent and solutes determine the solution concentration, such that if a solution has more solutes than the solvent, the solution will be more viscous, and here the concentration of the solution is 5 g/d\({m}^3\) (2.5 glucose/0.5 dm3).

Hence, if 2.5 g of glucose is dissolved in 0.5 dm3 of water, then the concentration of the solution will be 5 g/dm3, and the concentration of the solutes determines the concentration of the solution.

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Answer:

The process to use this knowledge is explained as below:

Explanation:

1. Farmer should use an indicator to check the pH value of the soil of the field of the farm.

2. If the field or the farm has alkali soil add acid to reduce the pH value.

3. If the soil of the farm is acidic for the crop add alkali to increase the pH value.

4. It will be a neutralization reaction and changes the pH value of the farm.

5. Weather/leeching into the surrounding soil/plant or animal waste will lead to a change in pH value over time.

6. The pH value will need to be regularly monitored and adjusted.

The half-life of palladium-100 is 4 days. after 16 days a sample of palladium-100 has been reduced to a mass of 7 mg.

The initial mass ( in mg) of the sample is 112 mg. The mass of the sample 8 weeks after the start is approximately 0.0068 mg.

The half-life of palladium-100 is 4 days, which means that every 4 days the amount of palladium-100 in a sample is reduced by half.

Let's use N(t) to represent the mass of the sample at time t, and N0 to represent the initial mass of the sample.

Since the half-life of palladium-100 is 4 days, we know that:

N(t) = N0 * (1/2)^(t/4)

We are given that after 16 days, the mass of the sample is 7 mg. So we can plug in these values and solve for N0:

7 = N0 * (1/2)^(16/4)

7 = N0 * (1/2)^4

7 = N0 * 1/16

N0 = 7 * 16

N0 = 112 mg

So the initial mass of the sample was 112 mg.

Now we can use the same formula to find the mass of the sample after 8 weeks (which is 56 days):

N(56) = 112 * (1/2)^(56/4)

N(56) = 112 * (1/2)^14

N(56) = 112 * 1/16384

N(56) = 0.00683594 mg.

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Answer:

- A ball does not move unlesss you kick it and it rolls aways

- a car stays still and is not in motion, unless you start the engine

- a pencil stays still on a table, it moves when you pick it up off the table

Explanation:

In the electromagnetic spectrum, the energy and frequency of radiation is given as, E=hυ where frequency is 0.603 ×10¹⁵ hertz.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.The relation is given as,E=hυ  where on substitution υ =E/h=4×10\(^-19\)/6.626×10\(^-34\)=0.603×10¹⁵ hertz

Thus, frequency of radiation is 0.603 ×10¹⁵ hertz.

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Answer:

1. Number 3

2. Number 1

3. Number 5

4. Number 4

5. Number 2

I think, this is the order.

Answer:

Neptune and Saturn although Neptune isn't on there so just Saturn.

hope it'll help ya out!

Answer: C

Explanation:

The density of the material which is the ratio of the mass and volume of the material is 10g/cm³

The density of a material is obtained using the relation ::

The density of the material can be obtained by obtaining the slope of the graph :

Therefore, the density of the materials is :

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If a 50 cm³ sample of gas exerts a pressure of 60 kPa at 35°C, then the volume it will occupy at STP is approximately 20.8 cm³.

To calculate the volume of the gas sample at STP we can use the combined gas law. Using the Combined Gas Law, we can relate the volume, pressure and temperature of a gas.

P1V1/T1 = P2V2/T2

Where,

P1V1/T1 is the initial state of gas and P2V2/T2 is the final state of gas.

P1 = 60 kPa

V1 = 50 cm³

T1 = (35 + 273.15) K = 308.15 K

P2 = 101.325 kPa (at STP)

V2 = ?

T2 = 273.15 K

Plugging the values in the formula,

P1V1/T1 = P2V2/T2

60 × 50 / 308.15 = 101.325 × V2 / 273.15

V2 = 101.325 × 60 × 50 / 308.15 × 273.15

V2 = 20.8 cm³

Thus, the volume of the gas sample at STP will be approximately 20.8 cm³.

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It would take one molecule of fumarase approximately Turnover for  9.8125 minutes to produce 7850 product molecules.

To calculate the time it would take one molecule of fumarase to produce 7850 product molecules, we need to divide the total number of product molecules by the enzyme's turnover number. Fumarase is an enzyme that catalyzes the reaction of fumarate to L-malate in the citric acid cycle. This reaction is an important step in cellular respiration and energy production in living cells. Fumarase speeds up the reaction by lowering the activation energy required for the conversion to occur, allowing the reaction to occur more quickly and efficiently.

Turnover number = 800 per minute

Product molecules = 7850

Time = 7850 / 800 = 9.8125 minutes

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Answer/Explanation:

A geyser is hot water erupting from a vent in the earth. Geysers are somewhat rare and occur in certain parts of the earth. Underneath, there are hidden chambers that provide constant flows of water. Sometimes when the tectonic plate of the earth move, it leaves gaps in between the hot earth's inner core and the ground. The magma inside is able to heat up the water from the earth. Since hot particle tend to rise, the water explodes out of the vent with such power from the heat.

The bond order of the diatomic species molecule B2 is given as 1 which is the correct option F.

Bond order is a formal way to quantify the number of covalent bonds that exist between two atoms in chemistry. Bond order is defined as the difference in the number of electron pairs in bonding and antibonding molecular orbitals, as stated by Linus Pauling in his introduction. An approximate indicator of a bond's stability is its bond order. The bond order is the same for isoelectronic species.

The number of chemical bonds between a pair of atoms is indicated by the bond order. For instance, the bond order of the diatomic nitrogen atoms, NN, and the carbon atoms, H-H-C-H, are both three. The bond order provides information on the bond's stability. The idea of the bond order of a chemical bond is simply understood thanks to the molecular orbital. It gauges the strength of the atoms' covalent connections.

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Complete question:

What is the expected bond order for the diatomic species B2?

Yes, the chemist can identify the substance in the sample.

When describing a compound's mass per mole, the term "molar mass" is employed. The molar mass is determined by multiplying the individual masses of all the atoms that make up a compound.

K₂O has a molar mass of 94.2 g/mol.

has a molar mass of 110.196 g/mol.

By multiplying the masses of each individual atom—one K atom weighs 39.0983 g/mol, whereas one O atom weighs 15.999 g/mol—the molar masses are obtained.

When the mass of a pure compound is known, the mass of oxygen (O) can be calculated by subtracting the mass of potassium (K) from the total mass. Since each of the mentioned compounds contain two K atoms, the difference in oxygen mass can be utilised to identify the pure chemical.

For instance, after deducting the mass of the K from the unknown molecule, the residual mass will be approximately 16 g if the compound is K₂O and approximately 32 g if the compound is K2O2.

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The complete question is

The compound K2O2 exists. A chemist can determine the mass of K in a sample of known mass that consists of either pure K₂O or pure K2O2. From this information, can the chemist answer the question of which compound is in the sample? Explain

Answer:

https://socratic.org/answers/220339

this is the answer , my grandpa create this page

Explanation:

Answer:

I have it.

Explanation: