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Mariulka [41]
4 years ago
8

Use the PhET simulation to identify what happens to the concentrations of a dilute Drink mix mixture or a pure Drink mix solutio

n for the following scenarios. A pure Drink mix solution can be obtained by draining all the mixture, then adding Drink mix to the container as a Solution (radio button in the upper right area of the simulation). Note that the Concentration meter can be placed toward the bottom of the container or in the stream of the Drink mix. Drag the appropriate items to their respective bins.

Chemistry
1 answer:
elena-s [515]4 years ago
7 0

Hello user, you did not add a picture of an attachment to enable me help you solve this problem. Please check the attachment I added i believe it is the question that needs to be solved.

Explanation:

1. In the first column

<u>INCREASE CONCENTRATION</u>: these are the items that needs to be placed in this bin

a. Add drink mix solid to a diluted mixture of drink mix in pure water

b. Add drink mix solution to a diluted mixture of drink mix in pure water

c. Add drink mix solid to pure drink mix solution

d Evaporate water from a diluted mixture of drink mix in pure water

e Evaporate water from pure drink mix solution

2. The items below are what should be placed in this bin,<u>DECREASE CONCENTRATION:</u>

a. Add water to a diluted mixture of drink mix in pure water

b. Add water to pure drink mix solution

3. These items here should be placed here. <u>DOES NOT AFFECT CONCENTRATION:</u>

a. Add pure drink mix solution to pure drink mix solution

b. Drain the pure drink mix solution

c. Drain the diluted mixture

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Which of the following choices would have a positive entropy change?
aalyn [17]

Answer:

  • The option <u><em>B) Fe₂O₃ (s) + 3C(s) → 2Fe(s) + 3CO₂(g),</em></u> because the reactants are only solid units and the products contain gas molecules.

Explanation:

A <em>positive entropy change</em> means that the entropy of the products is greater than the entropy of the reactants.

Entropy in a measure of the radomness or disorder of the system.

Let's see every reaction:

<u />

<u>A) 4NO₂ (g) + 2 H₂O (l) + O₂ (g) → 4 HNO₃ (aq)</u>

Since 5 molecules of a gas (high disorder) combines with 2 molecules of liquid to produce 4 units of aqueous HNO₃ you may expect that the product is more ordered than the reactants, which means that the change in entropy is negative (the entropy decreases).

<u />

<u>B) Fe₂O₃ (s) + 3C(s) → 2Fe(s) + 3CO₂(g)</u>

The left side (reactants) show only solid substances which is a highly ordered arrangement while the right side (products) show the formation a solid (ordered arrangement) and a gas (highly disoredered arrangement), so you can predict the increase of the system entropy, i.e. a positive entropy change.

The <u>equation C)</u> shows the combination of 12 gas molecules to produce 1 solid and 6 gas molecules, so you can expect that the entropy will decrease, i.e. a negative entropy change.

For <u>equation D)</u> the products include solid and gas reactants while the product is just one unit of solid substance, letting you to predict a negative entropy change.

4 0
3 years ago
Which reaction results in only a physical change?
Advocard [28]
D will because water just turns from liquid to a gas by adding heat. That is a physical change. The other equations are chemical changes.
4 0
4 years ago
What is the main type of heat transfer.
krek1111 [17]

Conduction

Convection

Radiation

Explanation:

The main types of heat transfer are heat transfer by conduction, convection and by radiation.

These forms of heat transfer has different modes of application.

  • Conduction is a form of heat transfer in solids. It requires a material medium to dissipate. Here, heat flows from a hot end to a cold end.
  • Convection is a form of heat transfer in fluids i.e liquids and gases. In convection, heat is transferred due to density differences between heated fluids.
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learn more:

Conduction brainly.com/question/1140127

#learnwithBrainly

8 0
3 years ago
Photosynthesis is what?
tigry1 [53]

Answer:

conversion of sunlight to cloraphil

Explanation:

plants absorb sun and convert it to energy

5 0
3 years ago
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If the natural abundance of Br−79 is 50.69 %, what is the natural abundance of Br−81?
Alexxandr [17]
The natural abundance of bromine in general in nature is 100%.
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the natural abundance of Br-79 + the natural abundance of Br-80 = 100

We know that the natural abundance of Br-79 is 50.69%. This means that the natural abundance of Br-80 is the rest of the 100%.

Natural abundance of Br-80 = 100% - 50.69% = 49.31%
8 0
3 years ago
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