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salantis [7]
3 years ago
14

Is FeS iron (ll) sulfide or iron (lll) sulfide?

Chemistry
1 answer:
Amiraneli [1.4K]3 years ago
4 0

Answer:

the valence of S is -2. For FeS to be neutral the valence of Fe used must be +2

and since Iron (II) has its valency 2, FeS will be Iron (II) Sulfide.

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How do the results of the iodine test indicate that hydrolysis of starch occurred
Irina18 [472]

Answer:

Blue color of iodine-starch complex is disappear upon hysrolysis

Explanation:

Starch:

Starch is a polysaccharide

it is energy reservoir.

starch is made of monomers of glucose in a chain form.

The simplest form of starch is linear polymer amylose.

Iodine Test:

In this test iodine solution added to the solution to check the presence of starch.  

Iodine solution = elemental iodine + KI

Result of Iodine Test:

when the iodine solution (I₃⁻) is added to a solution it show two types of result.

if the starch is present this I₃⁻ form a complex with amylose chain of starch and impart a dark blue color.

if starch is not present then the color will be orange or yellow.

Hydrolysis of Starch:

Hydrolysis of starch is carried out by an enzyme, this enzyme break down the starch into simpler sugar molecule.

So,

When the hydrolysis of starch occur the starch convert to glucose. Then the blue color of starch and iodine complex formed during iodine test is disappear that will be the indication of hydrolysis of starch.

6 0
3 years ago
Destructive waves erode the coastline in a number of ways. Identify the term that describes when air becomes trapped in joints a
Ahat [919]

The answer was D or Hydraulic action.

I know this because i had this question in USA Test Prep and i got it right.

I hope this helped you study or get this question right :D

P.S If you need help on USA Test Prep i really recommend that you make an account on Brainly.  

Your Welcome if i helped you, you can thank me by giving me 5 stars and a thanks !

<3 - Sofia

7 0
3 years ago
What is the chemical composition of chromatin?
mel-nik [20]
Chromatin is composed of both DNA and other proteins in which the Double stranded molecule of DNA wraps around. The answer is B.
6 0
3 years ago
Read 2 more answers
Help I do not understand this
NeTakaya

Hello!

To find the acceleration given the net force (N) and the mass (kg), we will need to use Newton's Second Law of Motion, which is shortened to be F = ma.

In this formula, F is the net force, m is the mass, and a is the acceleration.

Since we are given the net force and mass, we will be using division to find the acceleration, which is measured as m/s².

1). Net Force: 5.0 N; Mass = 2.5 kg

5.0 N / 2.5 kg = 2.0 m/s²

2). Net Force: 2.32 N; Mass = 12 kg

2.32 N / 12 kg ≈ 0.19 m/s²

3). Net Force: 18.2 N; Mass: 1.967 kg

18.2 N / 1.967 kg ≈ 9.25 m/s²

4). Net Force: 0.87 N; Mass: 21.2 kg

0.87 N / 21.2 kg ≈ 0.04 m/s²

5). Net Force: 180 N; Mass: 1.793 kg

180 N / 1.793 kg ≈ 100.39 m/s²

<u>Final answers</u>:

  1. 2.0 m/s²
  2. 0.19 m/s²
  3. 9.25 m/s²
  4. 0.04 m/s²
  5. 100.39 m/s²
7 0
4 years ago
An object measuring 0.78 decimeter will have length of how many centimeters?
Mandarinka [93]
0.78 decimetres= 7.8 centimetres
8 0
3 years ago
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