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Maru [420]
3 years ago
15

Hydrochloric acid reacts faster with powdered zinc than with an equal mass of zinc strips because the greater the surface area o

f the powdered zinc
1. decreases the frequency of particle collisions
2. decreases the activation energy of the reaction
3. increases the frequency of particle collisions
4. increases the activation energy of the reaction
Chemistry
1 answer:
inysia [295]3 years ago
7 0

Answer:

increases the frequency of particle collisions

Explanation:

One factor upon which the rate of reaction depends is the surface area of reactants.

According to the collision theory, reactions occur when reactant particles having the required (activation) energy collide with each other, this collision is inelastic. However, collision of particles having energies less than the activation energy results in elastic collisions and no chemical reaction.

The more the exposed surface area of reactants, the greater the number of particles that come into contact with each other and the more the chances of frequent effective collisions that lead to reaction.

Thus, powdered zinc reacts faster with hydrochloric acid than zinc strips

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Fermium-253 is a radioactive isotope of fermium that has a half-life of 3.0 days. A scientist obtained a sample that contained 2
Dahasolnce [82]

Problem 2

You start out with 216 ugrams of Fermium - 253. After 3 days, you will have 1/2 as much. 108 ugrams is what you have.

Another 3 days goes by. You started with 108 ugrams. That gets cut in 1/2 again. Now you have 54 ugrams.

Finally another 3 days goes by. You started with 54 ugrams. you now have 1/2 as much which would be 27 ugrams

#days              Amount in micrograms

0                              216

3                               108

6                                54

9                                27

Problem One

You are using Nitrogen as your base example. The first thing you should do is fill in the table. Then you should try and make some rules. You need the rules in case the exam you are preparing for picks a different element to talk about these bond tendencies. In any event, it's handy to think this way.

<em><u>Table</u></em>

Bond               Energy Kj/Mol               Bond Length pico meters

N - N                 167                                                145

N=N                  418                                                125

N≡N                  942                                               110

<em><u>Rules</u></em>

As the number of bonds INCREASES, the energy contained in the bond goes UP

As the number of bonds INCREASES, the length of the bond goes DOWN.

5 0
3 years ago
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The Henry's Law constant of methyl bromide, CH3Br, is KH = 0.159 mol/(L ∙ atm) at 25°C. What is the solubility of methyl bromide
Tanzania [10]

Answer:

Henry's law constant for a gas ch3br

28 The Henry's Law constant of methyl bromide, CH3Br, is k = 0.159 mol/(L⋅atm) at 25°C.

Explanation:

4 0
3 years ago
Select any of the following combinations which would make a good buffer solution?
KengaRu [80]

Answer:

b. 0.05 M H₂CO₃ + 0.05 M KHCO₃

d. 0.1M HCN + 0.2M NaCN

g. 0.2M NH₃ + 0.1M NH₄Br

Explanation:

A buffer solution consists of the following components:

  • A weak acid and its conjugate base.
  • A weak base and its conjugate acid.

<em>Which would make a good buffer solution?</em>

<em>a. 0.3 M HC₂H₃0₂ + 0.1 M HCI</em>

It does not have the components of a buffer solution. HCl is a strong acid.

<em>b. 0.05 M H₂CO₃ + 0.05 M KHCO₃</em>

It is a good buffer because it has a weak acid (H₂CO₃) and its conjugate base (HCO₃⁻), which comes from the salt.

<em>c. 0.05 M KC₂H₃O₂</em>

It does not have the components of a buffer solution.

<em>d. 0.1M HCN + 0.2M NaCN</em>

It is a good buffer because it has a weak acid (HCN) and its conjugate base (CN⁻), which comes from the salt.

<em>e. 0.2M NaF + 0.2M NaOH</em>

It does not have the components of a buffer solution. NaOH is a strong base.

<em>f. 0.3M NH₄Cl</em>

It does not have the components of a buffer solution.

<em>g. 0.2M NH₃ + 0.1M NH₄Br</em>

It is a good buffer because it has a weak base (NH₃) and its conjugate acid (NH₄⁺), which comes from the salt.

6 0
3 years ago
Find the volume of 200g of benzene, if the density of benzene is 0.88 g/mL.
Lina20 [59]

Answer:

<h2>227.27 mL</h2>

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

volume =  \frac{mass}{density} \\

From the question we have

volume =  \frac{200}{0.88}  \\  = 227.2727...

We have the final answer as

<h3>227.27 mL</h3>

Hope this helps you

7 0
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If 5 L of butane is reacted what volume of carbon dioxide is produced ILL GIVE BRAINLIEST
Len [333]

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This says for every mole of butane burned 4 moles of CO2 are produced, in other words a 2:1 ratio.

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Now we need to figure out the volume.  This depends on the temperature and pressure of the CO2 which is not given, so we will assume standard conditions:  273 K and 1 atmosphere.

We now use the ideal gas law PV = nRT, or V =nRT/P, where n is the # of moles of CO2, T the absolute temperature, R the gas constant (0.082 L-atm/mole degree), and P the pressure in atmospheres ( 1 atm).

V = 0.1894 x 0.082 x 273.0 / 1  =  4.24 Liters.

Explanation:

8 0
2 years ago
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