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3 years ago

Is gasoline evaporated a chemical change

Chemistry

2 answers:

Len [333]3 years ago

5 0

No. The only thing that changed was the looks of the gasoline, not the chemical components.

boyakko [2]3 years ago

5 0

Answer:

The correct answer is No

Explanation:

A chemical change is often characterized by the following

new substance is formed
not easily reversible
in most cases, process are represented by a chemical equation

The evaporation of gasoline does not meet any of the characteristics above. When, a gasoline evaporates, it is converted from it's liquid form to it's gaseous form hence no new substance is formed, and if this conversion is done in a controlled environment, the gaseous form can be easily reversed back to it's liquid form by cooling. There is no chemical equation needed for this process since no new substance is formed.

Because of the reasons provided earlier, evaporation of gasoline is a physical change and not a chemical change.

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What is the order of reaction with respect to a and b for a reaction that obeys the rate law: rate = k[a]4[b]5?

spin [16.1K]

The order of reaction with respect to a is 4 and with respect to b is 5 for a reaction that obeys the rate law.

The order of reaction is equal sum of power of concentration of the each reactant present in the reaction that obeys the rate law . The order of individual reactant or species present in the rate law is equal to the power of the of concentration of the respective species or reactant .

Example : If rate law is given as,

rate = k $[a]^{4} [b]^{5}$

The order of reaction with respect to a is 4 and with respect to b is 5 for a reaction that obeys the rate law.

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2 years ago

How do you make fried chicken im white and don't know how to season

Tpy6a [65]

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Explanation:

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3 years ago

Zinc metal is added to a flask containing aqueous hydrochloric acid. The flask contains 0.400 mole of HCl. How much hydrogen gas

dusya [7]

Answer:

0.4 g of hydrogen gas would be produced.

1. 0.48 mole of HCl is needed to react completely with 15.5 g of zinc.

2. HCl is the limiting reactant.

3. 2.61 g of zinc is in excess

Explanation:

From the balanced equation of reaction:

$Zn(s)+ 2HCl(aq) --> H_2(g) + ZnCl_2(aq)$

1 mole of Zn requires 2 moles of HCl to produce 1 mole of hydrogen gas.

15.5 g of zinc = 15.5/65.3 = 0.24 moles of zinc.

0.24 moles Zn is supposed to require 0.24 x 2 moles HCl which is equivalent to 0.48 moles HCl.

But only 0.400 mole of HCl is present. Hence, HCl is the limiting reagent. For complete reaction with 15.5 g of Zinc, 0.48 mole HCl would be needed.

0.400 mole of HCl will require 0.2 mole of Zn for complete reaction. This thus means that 0.24 - 02 = 0.04 mole of Zn is in excess.

0.04 mole Zn = 0.04 x 65.3 = 2.61 g excess Zn.

Now, since HCl is the limiting reagent;

2 moles of HCl is required to produce 1 mole of H2 according to the equation.

0.400 mole HCl will therefore yield 0.400 x 1/2 = 0.2 mole H2

0.2 mole H2 = 2 x 0.2 = 0.4 g H2

Hence, 0.4 g of hydrogen gas would be produced.

6 0

3 years ago

A flexible container holds 32.4L of gas at 55.0c. What will be the volume if the temperature falls to 17.0c

mash [69]

The answer will be 25.92 L for 17.0 c

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3 years ago

According to de Broglie, which of these objects does not have a wavelength?

polet [3.4K]

Answer: Option D is correct.

Explanation: Equation given by de Broglie is:

$\lambda =\frac{h}{mv}$

where, $\lambda$ = wavelength of the particle

h = Planck's constant

m = mass of the particle

v = velocity of the particle

In option A, football will have some mass and is moving with a velocity of 25 m/s, hence it will have some wavelength.

In Option B, unladen swallow also have some mass and is moving with a velocity of 38 km/hr, hence it will also have some wavelength.

In Option C, a person has some mass and is running with a velocity of 7 m/hr, hence it will also have some wavelength.

As, the momentum of these particles are large, therefore the wavelength will be of small magnitude and hence, is not observable.

From the above, it is clearly visible that all the options are having some wavelength, so option D is correct.

7 0

3 years ago