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1 year ago

Hello! Is it possible you can solve this chemistry question?

Chemistry

1 answer:

Pavlova-9 [17]1 year ago

6 0

Answer:

a. Gas pressure: decreases

b. Gas moles: remain constant

c. Average speed of gas molecules: decreases

d. Average distance between molecules: large

Explanation:

The kinetic molecular theory of gases explains the behavior and properties of gases.

In this case, the gas is cooled, so its temperature decreases.

a. Gas pressure:

To analyze the gas pressure we can use the Ideal Gas formula P.V=n.R.T, where pressure and temperature are directly proportional, that is, if the temperature decreases, the gas pressure will also decrease.

b. Gas moles:

The moles of gas remain constant, since the flask is sealed, so gases cannot enter or leave the flask.

c. Average speed of gas molecules:

Temperature is related to the average speed of movement of molecules, so as temperature decreases, the average speed of molecules also decreases.

d. Average distance between molecules:

As the average speed of molecules decreases, they stay in place, hardly moving, so the average distance between molecules is greater than if the molecules were moving faster.

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A 15.0 g sample of nickel metal is heated to 100.0 degrees C and dropped into 55.0 g of water, initially at 23.0 degrees C. Assu

OLEGan [10]

Answer: The final temperature of nickel and water is $25.2^{o}C$ .

Explanation:

The given data is as follows.

Mass of water, m = 55.0 g,

Initial temp, $(t_{i}) = 23^{o}C$ ,

Final temp, $(t_{f})$ = ?,

Specific heat of water = 4.184 $J/g^{o}C$ ,

Now, we will calculate the heat energy as follows.

q = $mS \Delta t$

= $55.0 g \times 4.184 J/g^{o}C \times (t_{f} - 23^{o}C)$

Also,

mass of Ni, m = 15.0 g,

Initial temperature, $t_{i} = 100^{o}C$ ,

Final temperature, $t_{f}$ = ?

Specific heat of nickel = 0.444 $J/g^{o}C$

Hence, we will calculate the heat energy as follows.

q = $mS \Delta t$

= $15.0 g \times 0.444 J/g^{o}C \times (t_{f} - 100^{o}C)$

Therefore, heat energy lost by the alloy is equal to the heat energy gained by the water.

$q_{water}(gain) = -q_{alloy}(lost)$

$55.0 g \times 4.184 J/g^{o}C \times (t_{f} - 23^{o}C)$ = -( $15.0 g \times 0.444 J/g^{o}C \times (t_{f} - 100^{o}C)$ )

$t_{f} = \frac{25.9^{o}C}{1.029}$

= $25.2^{o}C$

Thus, we can conclude that the final temperature of nickel and water is $25.2^{o}C$ .

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3 years ago

How many grams of hydrogen are necessary to react with 2.85 mol CO

Lynna [10]

CO+2 H2=CH3OH

2.85 mol Co x (2mol H2/1 mol Co)=5.70 mol just concert to grams

5.70 mol H2 x (2 g H2/1 mol H2) =11.40 grams of H2

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3 years ago

The best thermometer to use where temperatures drop below -39°C (-38.2°F) is:_______.

xxTIMURxx [149]

Answer:

The best thermometer to use for this temperature is the alcohol-in-a -glass thermometer.

Explanation:

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Due to its low freezing point, it can still function effectively as a thermometric liquid, expanding and contracting properly based on the applied heat, when dealing with temperature measurements that are at about -38.2°F.

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