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erma4kov [3.2K]

4 years ago

12

In an exothermic reaction:_________ A. The surroundings absorb heat from the reaction mixture. B. The surroundings release heat

to the reaction mixture.

1 answer:

Elis [28]4 years ago

7 0

Answer: option A. The surroundings absorb heat from the reaction mixture

Explanation:

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A race is 50 m, and it takes an athlete<br> 15s to run it.<br><br> True or false?

vredina [299]

true because the average time for a 50 meter dash for men is 7.57 seconds, however he would be late sadly

4 0

3 years ago

A certain radioactive isotope placed near a Geiger counter registers 160 counts per second. 32 hours later, the counter register

stealth61 [152]

I believe that the answer for this question would be option A. 8 HOURS. Based on the given scenario above about a certain radioactive isotope placed near a Geiger counter, the half-life <span>of the isotope 32 hours later would be 8 hours. Hope this is the answer that you are looking for. </span>

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3 years ago

Read 2 more answers

Compared to the freezing point of 1.0 M KCl(aq) at standard pressure, the freezing point of 1.0 M CaCl2(aq) at standard pressure

Galina-37 [17]

Answer : The correct option is, (1) lower

Explanation :

Formula used for lowering in freezing point :

$\Delta T_f=i\times k_f\times m$

where,

$\DeltaT_b$ = change in freezing point

$k_b$ = freezing point constant

m = molality

i = Van't Hoff factor

According to the question, we conclude that the molality of the given solutions are the same. So, the freezing point depends only on the Van't Hoff factor.

Now we have to calculate the Van't Hoff factor for the given solutions.

(a) The dissociation of $KCl$ will be,

$KCl\rightarrow K^++Cl^-$

So, Van't Hoff factor = Number of solute particles = 1 + 1 = 2

(b) The dissociation of $CaCl_2$ will be,

$CaCl_2\rightarrow Ca^{2+}+2Cl^-$

So, Van't Hoff factor = Number of solute particles = 1 + 2 = 3

The freezing point depends only on the Van't Hoff factor. That means higher the Van't Hoff factor, lower will be the freezing point and vice-versa.

Thus, compared to the freezing point of 1.0 M $KCl(aq)$ at standard pressure, the freezing point of 1.0 M $CaCl_2(aq)$ at standard pressure is lower.

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3 years ago

Base your answer on the data table below and on your knowledge of earth science. The data table shows the average percentage of

yan [13]

Answer:

Its color.

Explanation:

The color of ice is white and we know that white color is a good reflector while black color is a good absorbent. So that's why people in warm countries uses white clothes due to its reflecting property uses black clothes in winter due to its absorbing property. So due to white color of the ice sheet, more solar radiations are reflected back into the atmosphere after striking.

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3 years ago

Use the kinetic theory to describe the pressure of gases.

cupoosta [38]

The pressure of a gas results from collisions between the gas particles and the walls of the container. Each time a gas particle hits the wall, it exerts a force on the wall. An increase in the number of gas particles in the container increases the frequency of collisions with the walls and therefore the pressure of the gas.

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3 years ago