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Ira Lisetskai [31]

2 years ago

15

A large crystal of potassium manganate is placed in the bottom of a beaker of cold water, and left for several hours. Describe w

hat would be seen after 5 minutes

1 answer:

Katarina [22]2 years ago

5 0

Potassium manganate would dissolve in water

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Which equations represent precipitation reactions?

pychu [463]

A. : In this reaction one of the product, FeS is insoluble. Therefore, this is a precipitation reaction.

B. : In this reaction, the product is a solid(insoluble). So, this is a precipitation reaction too.

C.: In this reaction, both the products are soluble. So this is not a precipitation reaction.

D.: In this reaction, both the products are soluble. So this is not a precipitation reaction.

E. : In this reaction, the product AgCl is a precipitate. So, it is a precipitation reaction.

6 0

3 years ago

Read 2 more answers

The structural formula of 2-methyl-propane<br>-2-ol

daser333 [38]

Answer:

ch3c(ch3)(oh)ch3

Explanation:

that should be the answer

8 0

2 years ago

Air has a mass of 1.2g and a volume of 4,555ml. What is the density

coldgirl [10]

Answer:

<h2>Density = 0.00026 g/mL</h2>

Explanation:

The density of a substance can be found by using the formula

<h3> $Density(\rho) = \frac{mass}{volume}$ </h3>

From the question

mass of air = 1.2 g

volume = 4,555 mL

Substitute the values into the above formula and solve for the density

That's

<h3> $Density = \frac{1.2}{4555}$ </h3>

= 0.0002634

We have the final answer as

<h3>Density = 0.00026 g/mL</h3>

Hope this helps you

3 0

3 years ago

Write the products of photosystem i and photosystem ii

Margaret [11]

<span>ATP,O2 and NADPH are the </span>products<span>. H2O,NADP,ADP and Pi are the reactants. acts as an electron carrier between the cytochrome b6f and </span>photosystem 1 (PS1) complexes in the photosynthetic electron-transfer chain.

Photosystem II<span> (or water-plastoquinone oxidoreductase) is the first protein complex in the light-dependent reactions of oxygenic photosynthesis. It is located in the thylakoid membrane of plants, algae, and cyanobacteria.</span>

3 0

2 years ago

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The average propane cylinder for a residential grill holds approximately 18 kg of propane. How much energy (in kJ) is released b

brilliants [131]

Combustion is a chemical reaction between a fuel and an oxidant, oxygen, to give off combustion products and heat. Complete combustion results when all of the fuel is consumed to form carbon dioxide and water, as in the case of a hydrocarbon fuel. Incomplete combustion results when insufficient oxygen reacts with the fuel, forming soot and carbon monoxide.

The complete combustion of propane proceeds through the following reaction:
$C_{3} H_{8}$ + $5O_{2}$ --> $3CO_{2}$ + $4H_{2}O$

Combustion is an exothermic reaction, which means that it gives off heat as the reaction proceeds. For the complete combustion of propane, the heat of combustion is (-)2220 kJ/mole, where the minus sign indicates that the reaction is exothermic.

The molar mass of propane is 44.1 grams/mole. Using this value, the number of moles propane to be burned can be determined from the mass of propane given. Afterwards, this number of moles is multiplied by the heat of combustion to give the total heat produced from the reaction of the given mass of propane.

14.50 kg propane x <u> 1000 g </u> x <u> 1 mole propane </u> x <u> 2220 kJ </u>
1 kg 44.1 g 1 mole

= 729,931.97 kJ

8 0

2 years ago