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3 years ago

Not sure how to write this question so I will add an image

Chemistry

2 answers:

galben [10]3 years ago

8 0

Explanation:

1) When phosphoric acid reacts with calcium hydroxide neutralization reaction takes place in which calcium phosphate is formed along with formation of water.

The balanced chemical equation is give as:

$2H_3PO_4+3Ca(OH)_2\rightarrow Ca_3(PO_4)_2+6H_2O$

2) When calcium oxide acid reacts with phosphorus pentoxide addition reaction takes place in which calcium phosphate is formed.

The balanced chemical equation is give as:

$3CaO+P_2O_5\rightarrow Ca_3(PO_4)_2$

Nonamiya [84]3 years ago

5 0

Answer:

2H3PO4 + 3Ca(OH)2 = Ca3(PO4)2 + 6H2O

3CaO + P2O5 = Ca3(PO4)2

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24. A sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °C). If the ball is then played with o

baherus [9]

<u>Answer:</u> The correct answer is Option B.

<u>Explanation:</u>

To calculate the final pressure of the system, we use the equation given by Gay-Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant volume.

Mathematically,

$\frac{P_1}{T_1}=\frac{P_2}{T_2}$ (at constant volume)

where,

$P_1\text{ and }T_1$ are the initial pressure and temperature of the gas.

$P_2\text{ and }T_2$ are the final pressure and temperature of the gas.

We are given:

Conversion factor: $T(K)=T(^oC)+273$

$P_1=1.85atm\\T_1=25^oC=(25+273)K=298K\\P_2=?atm\\T_2=7.5^oC=(7.5+273)K=280.5$

Putting values in above equation, we get:

$\frac{1.85atm}{298K}=\frac{P_2}{280.5K}\\\\P_2=1.74atm$

Hence, the correct answer is Option B.

6 0

3 years ago

Which is true about reaction rates?

Oksana_A [137]

Answer:

the correct choice would be: 4. Reaction rates are not related to spontaneity.

Explanation:

The speed of reaction is independent of spontaneity, since it depends on other factors such as the amount of reagent.

The amount of reagent is one of the variables that most influences the speed of reaction, the greater the amount of reagent, the faster the reaction will be and thus the speed will be increased.

3 0

4 years ago

Which of the following best describes the

ella [17]

Answer: (C)

The frequency increases as the wavelength decreases

Explanation:

The relation between the frequency and wavelength of a wave is

Frequency = 1 / Wavelength

The Frequency of electromagnetic wave is inversely proportional to the wavelength. So, as the frequency increases, the wavelength of the wave decreases and vise-versa.

The frequency of a wave is number of complete cycles passing a particular point per second. Its S.I unit is Hertz whereas the wavelength of a wave is the distance between two consecutive crest and trough in meters.

So, on increasing the frequency of a wave, there will be more number of the cycles of wave per second which will decrease the distance between the consecutive crest and trough i.e wavelength.

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4 years ago

I NEED HELPP ASAP!!!!!!

alexdok [17]

1. transformation
2. transfer
3. transformation
4. transfer

not 100% but hope it helped kinda

8 0

3 years ago

Read 2 more answers

A 2.50 L balloon is filled with water at 2.27 atm. If the balloon is squeezed into a 0.80 L beaker and does NOT burst, what is t

Ludmilka [50]

Answer:

$P_2=7.09atm$

Explanation:

Hello!

In this case, given the change in volume and pressure of the gas, it is possible for us to recall the Boyle's law as way to understand the inversely proportional relationship between pressure and volume:

$P_1V_1=P_2V_2$

Thus, when solving for the final pressure, P2, given the initial pressure and volume and the final volume, we obtain:

$P_2=\frac{P_1V_1}{V_2}\\\\P_2=\frac{2.27atm*2.50L}{0.80L}\\\\P_2=7.09atm$

Best regards!

3 0

3 years ago

Read 2 more answers