If a solid piece of naphthalene is heated and remains at 80°C until it is completely melted, you know that 80ºC is the

Answers

Answer 1

Answer:

Answer: Melting point of the naphthalene is 80 $^oC$ .

Explanation:

Melting point of a substance is temperature at which given solid changes its state from solid to liquid. It is also referred as freezing point of the substance.

Freezing point of substance is a temperature at which given substance changes its state from liquid to solid.

Here, the solid piece of naphthalene is heated and remains at 80°C until it is completely melted.

Answer 2

Answer:

Answer : Freezing and Melting point

Explanation :

The solid piece of naphthalene when heated is observed to melt after it attains the temperature of 80° C and then this 80° C is called as it melting point. After 80° C naphthalene will start to melt and get transformed into liquid state. Also if this naphthalene is allowed to cool down after 80° C it will be the freezing point of naphthalene.

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Can the absolute energy states of the reactants (E1) and products (E2) be measured in a chemical reaction?

Answers

no it can not the absolute energy states of the reactants (E1) and products (E2) be measured in a chemical reaction
hope it helps

Answer:

No we cannot measure absolute energy states.

Explanation:

The absolute energy state means the internal energy of any molecule, either reactant or product. We cannot measure the internal energy of any reactant or product as internal energy or absolute energy is sum of all kind of energy including kinetic energy, vibration energy etc.

However we can measure the changes in these energy during any chemical process.

How many moles of nitrogen trifluoride (NF3) can be produced from 9.65 mole of Fluorine gas (F2)N2 + 3F2 -----------> 2NF3

Answers

Answer:

6.43 moles of NF₃.

Explanation:

The balanced equation for the reaction is given below:

N₂ + 3F₂ —> 2NF₃

From the balanced equation above,

3 moles of F₂ reacted to produce 2 moles of NF₃.

Finally, we shall determine the number of mole of nitrogen trifluoride (NF₃) produced by the reaction of 9.65 moles of Fluorine gas (F₂). This can be obtained as follow:

From the balanced equation above,

3 moles of F₂ reacted to produce 2 moles of NF₃.

Therefore, 9.65 moles of F₂ will react to to produce = (9.65 × 2)/3 = 6.43 moles of NF₃.

Thus, 6.43 moles of NF₃ were obtained from the reaction.

Is a euglena abiotic or biotic

Answers

I think it is biotic. hope this helps.

How many grams of calcium bromide are in 50.0 mL of a 0.25 M calcium bromide solution?

Answers

The mass of the compound can be calculated by the molarity. The mass of the calcium bromide in the given solution is 2.5 g.

The mass of the given compound can be calculated by the molarity formula,

$\bold {M = \frac {w}{m* v} * 1000}\n\n\bold {w = \frac {M* m* v}{ 1000}}$

Where,

M- molarity of the solution = 0.25 M

w - given mass =?

m -molar mass of Calcium bromide = 200 g/mol

v-volume in mL= 50 mL

Put the values in the formula,

$\bold {w = \frac {0.25* 200* 50}{ 1000}}\n\n\bold {w = 2.5\ g}$

Therefore, the mass of the calcium bromide in the given solution is 2.5 g.

To know more about Molarity,

brainly.com/question/12127540

$C_(m)=(n)/(V_(r))\n\nm=(m)/(M)\n\nC_(m)=(m)/(MV_(r)) \ \ \ \ \Rightarrow \ \ \ \ m=C_(m)MV_(r)}\n\nC_(m)=0.25(mol)/(L)\nM_{CaBr_(2)}=200(g)/(mol)\nV_(r)=50mL=0.05L\n\nm=0.25(mol)/(L)*200(g)/(mol)*0.05L= \emph{\textbf{2.5g}}$

The average speed of a nitrogen molecule in air at 25 °C is 515 m/s. Convert this speed to miles per hour.

Answers

Answer:

1151.08miles/h

Explanation:

The given speed is 515 m/s

To convert meters per second to miles per hour:

Convert meters to miles: 1 m = 0.000621371 miles

Convert seconds to hours: 1 hr = 3600 s

Plug into the formula: miles/hr = (m/s) * (0.000621371 miles/m) * (3600 s/hr)

Plugging in the numbers: miles/hr = (515 m/s) * (0.000621371 miles/m) * (3600 s/hr) miles/hr = 1151.08miles/h

Therefore, the average speed of a nitrogen molecule in air at 25 °C converted to miles per hour is 1151.08miles/h.

Final answer:

To convert the average speed of a nitrogen molecule in air from meters per second to miles per hour, first convert the speed from meters per second to kilometers per hour, and then convert from kilometers per hour to miles per hour.

Explanation:

To convert the average speed of a nitrogen molecule in air from meters per second to miles per hour, we can use the conversion factor 1 mile = 1609.34 meters and 1 hour = 3600 seconds.

First, let's convert the speed from meters per second to kilometers per hour. We divide the speed in meters per second by 1000 to get the speed in kilometers per second and then multiply by 3600 to get the speed in kilometers per hour. This gives us a speed of approximately 1850 km/h.

Next, we convert the speed from kilometers per hour to miles per hour by dividing the speed in kilometers per hour by 1.60934. This gives us a speed of approximately 1150 mph.

Learn more about speed conversion here:

brainly.com/question/34421469

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[17]. Trimix 10/50 is a gas mixture that contains 10% oxygen and 50% helium, and the rest is nitrogen. If a tank of Trinix 10/50 has a total pressure of 2.07 x 10^4 kPa, then what is the partial pressure of nitrogen? a). 1.04 x 10^4 kPa
x b). 8.3 x 10^3 kPa
c). 2.07 x 10^3 kPa
d). 2.07 x 10^4 kPa

Answers

The answer is B. 8.3x10^3 kPa. The partial pressure of a specific gas in a gas mixture is equivalent to product of its mole fraction and total pressure of the mixture. Since it was stated that the mixture is 10% oxygen, 50% helium, and the rest nitrogen, it can be determined that nitrogen is 40% of the mixture. So 40% of 2.07x10^4 kPa is 8.3x10^3 kPa.

Answer:

A) 1.04 x 10^4 kPa

Explanation:

I'm not exactly sure how but I took the test and this was the correct answer. My calculations said it was B as well but I guess not...

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