The heat of vaporization of water is 540 cal/g. How much heat is needed to change 4.28g of water to steam?

Answer:

mass of kI = 74.55 Atomic mass

74.55 g ---> 1 mole

48.9 g --> ?

48.9 / 72

0.7 mole.

In one mole of kI --->

The atom present in Option (1) most likely to form cation with a charge of +1

A cation has more protons than electrons, consequently giving it a net positive charge.

For a cation to form, one or more electrons must be lost, typically pulled away by atoms with a stronger affinity for them.

The atoms present in Option 1 have one eletron in its outermost shell therefore, it is easy for the atom to lose one elecron than more electron  and to attain stable electronic confiuration.

Hence, The atom present in Option (1) most likely to form cation with a charge of +1

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Answer:

Option 1

Explanation:

You need to make the number of each type of atom on both sides the same, and this can only be done by changing the coefficients.

Answer:

1. Thermometer– It is used to measure air temperature.

2. From time to time– In 2–4hrs after sunrise, the air temperature rises the fastest. Around 1hr before sun set, the air temperature drops the fastest. The solar radiation reaches its highest value at noon.

3. Anemometer– it is used to measure wind speed and direction.

4. Direction– The wind vane originally measures the direction of the wind, but, some modern ones have wind cups attached to them, to measure the wind speed.

5. Anemometer– It is a device that measures wind speed and direction. These, days, some modern wind vanes also measure wind speed.

Explanation:

I hope this helps.

Answer:

CH3-CH3 in a compound name is Ethane

Explanation:

hope it will help you

Answer:

d

Explanation:

k-shell has the greatest binding energy

Running blades is the controversial prosthetics which may confer an athletic advantage over able-bodied runners.

This is also referred to as running prosthetics which allows someone move faster with less effort.

This happens when top speed has been achieved and offers an advantage over able-bodied runners.

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Considering the definition of STP conditions and Avogadro's number, the number of molecules of gas present in 2.24 L is 6.023×10²² molecules.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

At STP, 2.24 L of carbon dioxide gas is collected. So, you can apply the following rule of three: if by definition of STP conditions 22.4 L are occupied by 1 mole of carbon dioxide gas, 2.24 L are occupied by how many moles of carbon dioxide gas?

[tex]amount of moles of carbon dioxide gas=\frac{2.24 Lx1 mole}{22.4 L}[/tex]

amount of moles of carbon dioxide gas= 0.1 moles

Finally, 0.1 moles of carbon dioxide gas are collected.

Then you can apply the following rule of three, considering the Avogadro's number:  If 1 mole of carbon dioxide gas contains 6.023×10²³  molecules, 0.1 mole of carbon dioxide gas contains how many molecules?

amount of molecules of carbon dioxide gas= (6.023×10²³ molecules × 0.1 moles)÷1 mole

amount of molecules of carbon dioxide gas=6.023×10²² molecules

Finally, the number of molecules of gas present in 2.24 L is 6.023×10²² molecules.

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The heat that creates this temperature change coming from change in the internal energy of the system as per as first law of thermodynamics.

A law stating that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.

As we know, Boyle's law only works when the gas is kept at a constant temperature

Here,

When volume of gases decreased, it means work done has occurred on the system, so the work done is used for raising internal energy of the gas and the other is released as the thermal energy.

So,

According to 1st law of thermodynamics,

we know  Q =  ΔU + W  i.e, change in internal energy and work done. So this is a reason. Changing temperature occurs.

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Answer:

this image represents both a crystalline solid [you can tell because it is clearly a solid, and it has a tightly packed/organized into rows layout}

and a pure element [you can tell this because it is pure--meaning that it is not a mixture (which is why it's not classified as a homogenous mixture instead)]

hope this helps!

Answer:

1 and 4

Explanation:

Pure element because it is made by same type of atom.

Crystalline solid because its structure define it as a solid

A voltaic cell is used to produce electrical energy with the help of chemical reactions.

Relating to, or producing direct electric current by chemical action.

A Voltaic Cell (also known as a Galvanic Cell) is an electrochemical cell that uses spontaneous redox reactions to generate electricity. It consists of two separate half-cells.

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Answer:

5.452  cal/g

Explanation:

45.8 cal / 8.4 g =   5.4523  cal/g

384.72 J is the heat of fusion of the substance.

It is the change in the value of the enthalpy by providing energy i.e. heat, for a specific quantity of the substance.

Given data:

Heat of fusion  =?

Mass of substance = 8.4 g

Unknown:

Amount of energy required to melt the given mass = 45.8 cal

Solution:

To solve this problem, the amount of energy required to melt the substance is given as;

H  = m L

m is the mass

L is the heat of fusion

Insert the given parameters and solve;

H  = 8.4 g  x 45.8 cal = 384.72 J

Hence, 384.72 J is the heat of fusion of the substance.

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The equation for the overall reaction obtained by adding these equations is;  2NO₂(g) ⇒ N₂O₄(g)

We are given equations;

2NO₂(g) ----> 2NO(g) + O₂(g)   ---(1)

2NO(g) -----> N₂(g) + O₂(g)   -----(2)

N₂(g) + 2O₂(g) ----> N₂O₄(g)   -----(3)

Add eq 1 and eq 2 to get;

2NO₂(g) + 2NO(g) ⇒ 2NO(g) + O₂(g) + N₂(g) + O₂(g)

2NO will cancel out to get;

2NO₂(g) ⇒ N₂(g) + 2O₂(g)   -----(4)

Add eq 3 to eq 4 to get;

N₂(g) + 2O₂(g) + 2NO₂(g) ⇒ N₂O₄(g) + N₂(g) + 2O₂(g)

This will reduce to;

2NO₂(g) ⇒ N₂O₄(g)

The correct question is;

Consider the chemical equations shown here.

2NO₂(g) ----> 2NO(g) + O₂(g)

2NO(g) -----> N₂(g) + O₂(g)

N₂(g) + 2O(g) ----> N₂O₄(g)

What is the equation for the overall reaction obtained by adding these equations?

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Answer:

A &D

Explanation:

I took it

Answer:

3 ZnS (s) + 2 AIP(s) ---> AI₂S₃(s) +  Zn₃P₂(s)

Explanation:

I believe you are asking for this reaction to be balanced. However, after looking more closely, those are not the products that would be created from the reactants. Assuming this is a double-displacement reaction, and taking the most common charges of the ions into consideration, the actual products would be AI₂S₃(s) + Zn₃P₂(s). I apologize if I assumed incorrectly.

For an equation to be balanced, there needs to be the same amount of each element on both sides of the equation.

The unbalanced equation:

ZnS (s) + AIP(s) ---> AI₂S₃(s) + Zn₃P₂(s)

Reactants: 1 zinc, 1 sulfur, 1 aluminum, 1 phosphorus

Products: 3 zinc, 3 sulfur, 2 aluminum, 2 phosphorus

As you can see, there is an unequal amount of each element on the reactants and products side. To balance the equation, coefficients in front of the compound(s) will be necessary.

The balanced equation:

3 ZnS (s) + 2 AIP(s) ---> AI₂S₃(s) +  Zn₃P₂(s)

Reactants: 3 zinc, 3 sulfur, 2 aluminum, 2 phosphorus

Products: 3 zinc, 3 sulfur, 2 aluminum, 2 phosphorus

Answer:

I don't know ok sorry

The ionization energy will increase substantially when 11th electron is removed compared to when the 10th electron is removed.

Ionization energy is the energy required to remove one or more electrons from a neutral atom in its gaseous state to form a positively-charged ion.

The ionization energy increases steadily as successive electrons are removed from an atom. A substantial increase in ionization energy occurs with the removal of an electron from a filled inner shell.

The 10th electrons is the last electron in the L shell of atoms. The 11th electron is the first electron in a  filled inner shell.

Therefore, ionization energy will increase substantially when 11th electron is removed compared to when the 10th electron is removed.

Note that there was no attached graph and the answer was given based on the general trend observed in ionization energies.

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Answer:

B.) It states that the change in enthalpy is independent of the pathway
the reaction takes to get to the products.

Explanation:

Hess's Law states that the overall enthalpy change is the sum of the enthalpy changes of all preceding steps. It does not matter how many steps there are or the type, so long as the enthalpy change of each is combined at the end, the overall change can be determined. The sequence (aka pathway) is not important.

The least massive particle is the electron. Hence, the option true is correct.

Sub-atomic particles are tiny particles of matter that together constitute an atom. There are three subatomic particles, which are namely electrons, protons and neutrons.

Protons and neutrons have approximately the same mass, but they are both much more massive than electrons (approximately 2,000 times as massive as an electron).

Hence, the option true is correct.

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Answer: 3 O2

Explanation:

4AI +____O2 → 2Al₂O3.

In the product, Al and O3 are one chemical now and therefore BOTH impacted by the coeffcient in front of the Al which is 2. We know the coefficient is 2 and there are 3 molecules of O meaning that there are 6 molecules of O in the product. To balance this, there should be 6 molecules of O on the reactant side, the same way there is 4 Al molecules on both sides of the reaction. So 6 divided by 2 is 3 so put a 3 in the blank.

93.80 % is the per cent yield of the reaction [tex]Fe_2O_3(s)+3CO(g)[/tex] → [tex]2Fe(s)+3CO_2(g)[/tex].

A mole is a very important unit of measurement that chemists use. A mole of something means you have 602,214,076,000,000,000,000,000 of that thing, like how having a dozen eggs means you have twelve eggs.

[tex]Fe_2O_3(s)+3CO(g)[/tex] → [tex]2Fe(s)+3CO_2(g)[/tex]

[tex]50.5 g Fe_2O_3[/tex] x ([tex]1 mol of Fe_2O_3[/tex] ÷ [tex]159.69 g Fe_2O_3[/tex]) x ([tex]2 mol\; of Fe[/tex] ÷ [tex]1 mol Fe 34.97 g Fe[/tex])

[tex]% of yield = \frac{Practical X 100}{Theoretical}[/tex][tex]Percentage \;of \;yield = \frac{Practical X 100}{Theoretical}[/tex]

[tex]Percentage\; of yield = \frac{32.8 X 100}{34.97}[/tex]

= 93.80 %

Hence, 93.80 % is the per cent yield of the reaction.

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Water (H2O) is more soluble in Ammonia (most soluble)

Nitrogen gas then follows as the next. (soluble)

Sulphur (iv) oxide is the least soluble in Ammonia.(least soluble)

Answer:

A.) S

Explanation:

Anions form when elements have more electrons than protons. Some elements want to gain electrons because all elements desire a full octet (8 valence electrons). That being said, some elements are closer to a full octet by gaining electrons, whereas some are closer when they give up electrons.

As a general rule, as you move to the right across the period table, the number of valence electrons an element has increases. Therefore, on the right of the periodic table, these elements have a little less than 8 valence electrons. It makes sense that these elements want to gain those last few electrons to gain a full octet, rather than giving up electrons. Sulfur (S) has 6 valence electrons (located in the 16th column). To gain a full octet, it will gain two electrons and thus become an anion.

Na, Mn, and Ba are on the left of the periodic table, so they'd rather give up electrons than gain them (to become cations).

If the balloon had a volume of 3 L at a depth of 50 m, the original volume of the balloon will be

Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value.

The pressure at a depth of 40 m is the hydrostatic pressure of the water plus the atmospheric pressure.

The hydrostatic pressure P of a liquid is given by the formula ;

P = ρgh

where,

P =  1000 kg m⁻³ x 9.81 ms⁻² x 50 m

   = 1000 kg m⁻¹ x 9.81 s⁻² x 50

   = 4.9 x 10⁵ Pa

Lets's Convert Pa in to atm

    =   4.9 x 10⁵ Pa x 1 / 103. 325 x 10³ Pa

    = 4.7 atm

Mow, lets calculate P(atm) ;

P(atm) = 14.7 psi x 1 atm / 14.7 psi

          = 1 atm

Total Pressure at 50 m is ;

P(total) = 4.7 atm + 1 atm

            = 5.7 atm

Now we can apply Boyle's Law to calculate the volume of the balloon at the surface.

P₁V₁ = P₂V₂

V₂ = P₁V₁ / P₂

According to the question ;

V₂ = 3 L x 5.7 atm  / 1 atm

     = 17.1 L

     = 20 L ( 1 significant figure)

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Given the model from the question,

From the model given, we obtained the ffolowing

Thus, we can write the balanced equation as follow:

3H₂ + 2NO —> N₂ + 2H₂O + H₂

From the balanced equation above,

3H₂ + 2NO —> N₂ + 2H₂O + H₂

From the balanced equation above,

3 moles of H₂ reacted with 2 moles of NO.

Therefore,

5 moles of H₂ will react with = (5 × 2) / 3 = 3.33 moles of NO

From the calculation made above, we can see that only 3.33 moles of NO out of 4 moles given are required to react completely with 5 moles of H₂.

Thus, H₂ is the limiting reactant

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The combination in Option D , NaCl + HCl  is not a buffer

A buffer is a solution which is added to resist changes in pH when a small amount of acid.

It is generally made of weak base with its conjugated acid ,  weak acid with its conjugated base.

A buffer comes with a defined with a capacity .

Among the given option the solution mixture  which is not a buffer is

NaCl + HCl

as a buffer is not made of a strong acid and its salt.

Therefore Option D is not a buffer.

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Answer:

15 seconds x (1 hour/3600 seconds)

Explanation:

By the factor label method. There are 60 seconds in a minute and 60 minutes in an hour.

15 seconds x (1 minute/60 seconds) x (1 hour/60 minutes) = your answer

Soon enough you'll realize that 60x60=3600 and so there are 3600 seconds in 1 hour. Then you will only need 1 conversion ratio;

15 seconds x (1 hour/3600 seconds) = your answer

Answer:

15 / 3600

Explanation:

15 / 3600

The number of moles of N₂ contained in the flask will be 0.607.

According to Boyle's law, the pressure of a gas tends to drop as the capacity of the container increases. The ideal gas equation is formed from the Boyles and Charles law.

Given data,

Pressure,P= 2.86 ATM

Volume,V = 5.00 L

Universal gas constant,R= 0.08206 L atm/mol K

Temperature,T= 13.86 °C = 286.8 K

From the ideal gas equation;

PV=nRT

2.86 × 5 = n × 0.08206 × 286.8

n = 0.607 moles

Hence the number of moles of N₂ contained in the flask will be 0.607.

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Answer:

my increasing the amount of input force inorder to lift the load

When One mole of hydrogen is burned in oxygen to produce water in the gas phase, 285.8 kJ of heat is released.Hence, option (D) is correct

An enthalpy change is approximately equal to the difference between the energy used to break bonds in a chemical reaction and the energy gained by the formation of new chemical bonds in the reaction.

It describes the energy change of a system at constant pressure. Enthalpy change is denoted by ΔH.

The energy change that occurs when one mole of a compound is burnt in excess oxygen under standard bis called the standard enthalpy change of combustion.

Hence, When One mole of hydrogen is burned in oxygen to produce water in the gas phase, 285.8 kJ of heat is released.Thus, option (D) is correct

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Answer:

Just under 1 tsp

Explanation:

This is a situation where dimensional analysis is helpful....

156 mg / (80 mg / 2.5 ml    *  5 ml / tsp ) =

156 mg / ( 160 mg/tsp)   = .975  tsp    ~~~  1 tsp