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Ksju [112]
2 years ago
13

During this chemical reaction energy is released. In the chemistry lab, this would be indicated by an increase in temperature or

, if the reaction took place in a test tube, the test tube would feel warmer to the touch. Reactions like this release energy because
A) the reaction requires activation energy.

B) the reactants have less potential energy than the products.

C) the reactants have more potential energy than the products.

D) the mass of the products is greater than the mass of the reactants.
Physics
2 answers:
PtichkaEL [24]2 years ago
6 0

Answer:

C) the reactants have more potential energy than the products.

Explanation:

mr Goodwill [35]2 years ago
4 0

Answer:

C) the reactants have more potential energy than the products.

Explanation:

Since there is a difference between the potential energy of the reactants and the products, that energy has to leave the formula and into its surroundings, meaning that there will be a liberation of energy, increasing the temperature of the surroundings and or in the closed system in which the reaction is taking place, that is an exhotermic reaction.

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Lapatulllka [165]

To solve this problem we will apply the concepts related to the calculation of the speed of sound, the calculation of the Mach number and finally the calculation of the temperature at the front stagnation point. We will calculate the speed in international units as well as the temperature. With these values we will calculate the speed of the sound and the number of Mach. Finally we will calculate the temperature at the front stagnation point.

The altitude is,

z = 20km

And the velocity can be written as,

V = 3530km/h (\frac{1000m}{1km})(\frac{1h}{3600s})

V = 980.55m/s

From the properties of standard atmosphere at altitude z = 20km temperature is

T = 216.66K

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Velocity of sound at this altitude is

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Then the Mach number

Ma = \frac{V}{a}

Ma = \frac{980.55}{296.049}

Ma = 3.312

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T_0 = T(1+\frac{k-1}{2}Ma^2)

T_0 = (216.66)(1+\frac{1.4-1}{2}*3.312^2)

T_0 = 689.87K

Therefore the temperature at its front stagnation point is 689.87K

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