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mylen [45]
2 years ago
10

As part of a science experiment, Jose did a test for starch on a slice of apple and a slice of potato. The yellow-orange iodine

solution stayed the same color when it was put on the apple, but it became black on the potato.
Chemistry
1 answer:
juin [17]2 years ago
5 0

Answer:

See explanation

Explanation:

Iodine solution is used to test for starch.  A positive test for starch gives a blue-black color.

The fact that the color of the apple remained the same is indicative of the fact that starch was not contained in the apple.

A change in the color of potato indicates the presence of starch in the potato.

The fact that iodine did not react with apple should not be taken to mean that apples contain no starch at all. Starch changes gradually to sugar as fruits ripen. This is why the apple gave a negative test for starch.

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2C6H5COOH + 15O2 → 14CO2 + 6H2O which of the following options gives the correct product:product ratio?
mash [69]
You did not include the options but I can tell you the product ratio.

The product ratio is the mole ratio of the products of the reaction.

From the balanced chemical equation you have all the mole ratios:

The given equation is: 2 C6H5COOH + 15O2 --> 14 CO2 + 6H2O

The mole ratios are: 2 C6H5COOH: 15 O2: 14 CO2 : 6 H2O

The products are CO2 and H2O

Their mole ratio = 14 CO2 : 6 H2O

That can be expressed as:

14 mol CO2        7 mol CO2
----------------- =  -----------------
  6 mol H2O        3 mol H2O

It is also the same that:

6 mol H2O : 14 mol CO2

  6 mol H2O           3 mol H2O
------------------ =  -------------------
14 mol CO2           7 mol CO2

So, compare your options to the ratios show above and pick the proper ratio.
7 0
2 years ago
Og is the noble gas after rn. to go from [rn] to [og], you must fill four subshells (s, p, d, and f) with a total of 32 electron
Juliette [100K]

Answer : 50 electrons are needed to fill all five subshells

Explanation :

To move from Rn to Og, we need to fill 4 subshells which are s, p d & f.

The maximum number of electrons that can be added to each orbital are given below.

s = 2 e⁻

p = 6 e⁻

d = 10 e⁻

f = 14 e⁻

If we add all these electrons, we get 2 + 6 + 10 + 14 = 32 electrons.

We need to add 32 electrons to the atomic number of Rn to get the atomic number of Og.

Hence we say that the atomic numbers of 6th and 7th period elements of the same group differ by 32.

To go from Og to the next noble gas, we have to theoretically fill 5 subshells.

The maximum electrons that can be added to g orbital are 18.

Therefore in order to go from Og to next element, we would add

2 + 6 + 10 + 14 + 18 = 50 electrons.

50 electrons are needed to fill all five subshells.


5 0
2 years ago
Read 2 more answers
What alkene reacts the fastest with HBr?
Rasek [7]
The first step in the reaction is the double bond of the Alkene going after the H of HBr. This protonates the Alkene via Markovnikov's rule, and forms a carbocation. The stability of this carbocation dictates the rate of the reaction. 

<span>So to solve your problem, protonate all your Alkenes following Markovnikov's rule, and then compare the relative stability of your resulting carbocations. Tertiary is more stable than secondary, so an Alkene that produces a tertiary carbocation reacts faster than an Alkene that produces a secondary carbocation.


I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
</span>
3 0
2 years ago
Read 2 more answers
What element has a ion smaller than a ion of calcium?
elena55 [62]
It is scandium or titanium iron chroniclemium vanadium manganese
5 0
2 years ago
How many grams of CO2 will be produced from 12.0 g of CH4 and 133 g of O2?
jek_recluse [69]

Answer:

145 grams

Explanation:

conservation of mass

12.0+133=145

6 0
2 years ago
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