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3 years ago

Write a paragraph explaining the effect of surface area on the rate of reaction.

Chemistry

1 answer:

nexus9112 [7]3 years ago

6 0

(For a bit of context I will use the reaction between HCl and Mg as an example)

The larger the surface area of the magnesium metal, the more particles are exposed to collide with the aqueous HCl particles to cause the reaction to occur. This increases the frequency per second of collisions, speeding up the rate of reaction.

The effect of a catalyst is to reduce the minimum collision energy which allows the reaction to happen. This does not increase the number of collisions per second, but increases the percentage of successful collisions, which consequently causes the rate of reaction to increase .

I have drawn diagrams showing the effect of surface area, but there isn't really a meaningful diagram that I know of to show the impact of a catalyst (at least not at GCSE level).

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At 517 mm Hg and 24 °C, a sample of gas occuples a volume of 95 ml. The gas is transferred to a 225-ml flask and the temperature

vodomira [7]

Answer:

$P_2=194.78mmHg$

Explanation:

Hello,

In this case, we employ the combined ideal gas law in order to understand the volume-gas-pressure behavior as shown below:

$\frac{P_1V_1}{T_1}= \frac{P_2V_2}{T_2}$

Hence, solving for the final pressure P2, we obtain (do not forget temperature must be absolute):

$P_2=\frac{P_1V_1T_2}{V_2T_1}=\frac{517mmHg*95mL*(-8.0+273.15)K}{(24+273.15)K*225mL}\\ \\P_2=194.78mmHg$

Best regards.

7 0

4 years ago

Read 2 more answers

Describe in general a process desert plants might need to carry out in order to maintain homeostasis. (4 points) All plants need

harkovskaia [24]

Answer:

Cacti remain homeostasis because of the lack of leafs it has, because it has no leaves it absorbs less heat keeping more water, it also has a nice waxy coat that remains moist and grows depending on the amount of water it holds, and it's stem acts as a water supply keeping the plant fed and cool in harsh ecosystems.

Hope this helps.

6 0

4 years ago

This is the type of attraction that holds elements like nickel, sodium and gold together. For these elements, stationary, positi

Andrew [12]

The answer is metallic bonding as this bond is the one responsible of having to provide attraction in the electrons and atoms that could lead of having substance to be made as a glue in order to provide definite structure and it explains the description above.

3 0

4 years ago

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Write the balanced NET ionic equation for the reaction when chromium(III) bromide and sodium phosphate are mixed in aqueous solu

Mariulka [41]

The balanced NET ionic equation for the reaction is CrBr₃(aq) + Na₃PO₄(aq) ==> CrPO₄(s) + 3NaBr(aq)

<h3>What is a balanced Ionic equation ?</h3>

In a balanced ionic equation, the number and type of atoms are the same on both sides of the reaction arrow.

Additionally, the net charge is the same on both sides of the equation.

Separate into the complete ionic equation.

It should be obvious that the aquous solutions ionize and the solid is shows as the molecule since it doesn't dissolve.

Cr³⁺(aq) + 3Br⁻(aq) + 3K⁺(aq) + PO₄³⁻(aq) ==> CrPO₄(s) + 3K⁺(aq) + 3Br⁻(aq)

Now look and cancel those ions common to both sides. What is left is the net ionic equation.

Cr³⁺(aq) + PO₄³⁻aq) ==> CrPO₄(s)

Learn more about balanced Ionic equation here ;

brainly.com/question/16463650

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7 0

2 years ago

A rigid 3.80 L sealed vessel contains 0.650 mol Ne, 0.321 mol Kr, and 0.190 mol Xe. Find the density of the mixture in g/L.

Eddi Din [679]

Answer:

17.09g/L

Explanation:

Density = total mass of elements/ volume

We need to find the mass of each mixture constituents using their molar mass:

mole = mass/molar mass

For Neon (Ne) which contains 0.650mol;

0.650 = mass/20.18

mass = 0.650 × 20.18

mass = 13.12g

For Krypton (Kr) which contains 0.321mol;

0.321 = mass/83.79

mass = 0.321 × 83.79

mass = 26.89g

For Xenon (Xe) which contains 0.190mol;

0.190 = mass/131.3

mass = 0.190 × 131.3

mass = 24.95g

Total mass = 13.12g + 26.89g + 24.95g = 64.96g

Density = total mass / volume

Density = 64.96g / 3.80L

Density of the mixture = 17.09g/L

7 0

3 years ago