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3 years ago

What is starch test?

Chemistry

2 answers:

erik [133]3 years ago

8 0

Did you try and ask your teacher

Fed [463]3 years ago

4 0

Answer:

The starch test also known as the iodine test is used to test for the presence of starch.

Sorry if this isn’t detailed enough. You can go on google/wikipedia and find much more detail if necessary. ^-^

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An object that allows almost all that light that strikes it to pass through and that forms a clear image is

ra1l [238]

Answer: the object is transparent.

Explanation:

let me know if this helps

5 0

3 years ago

Select all that apply.<br><br> The stability of atomic nuclei is related to the _____.

ohaa [14]

Neutrons and protons

8 0

3 years ago

The normal boiling point of ethanol (C2H5OH) is 78.3 oC and its molar enthalpy of vaporization is 38.56 kJ/mol. What is the chan

Sloan [31]

Answer:

The change in entropy in the system is -231.5 J/K

Explanation:

Step 1: Data given

The normal boiling point of ethanol (C2H5OH) is 78.3 °C = 351.45 K

The molar enthalpy of vaporization of ethanol is 38.56 kJ/mol = 38560 J/mol

Mass of ethanol = 97.2 grams

Pressure = 1 atm

Step 2: Calculate the entropy change of vaporization

The entropy change of vaporization = molar enthalpy of vaporization of ethanol / temperature

The entropy change of vaporization = 38560 J/mol / 351.45 K

The entropy change of vaporization = -109.72 J/k*mol

Step 3: Calculate moles of ethanol

Moles ethanol = mass / molar mass ethanol

Moles ethanol = 97.2 grams / 46.07 g/mol

Moles ethanol = 2.11 moles

Step 4: Calculate change in entropy

For 1 mol = -109.72 J/K*mol

For 2.11 moles = -231.5 J/K

The change in entropy in the system is -231.5 J/K

7 0

3 years ago

The first-order decay of radon has a half-life of 3.823 days. How many grams of radon decomposes after 5.55 days if the sample i

Leni [432]

Answer:

The mass of radon that decompose = 63. 4 g

Explanation:

R.R = P.E/(2ᵇ/ⁿ)

Where R.R = radioactive remain, P.E = parent element, b = Time, n = half life.

Where P.E = 100 g , b = 5.55 days, n = 3.823 days.

∴ R.R = 100/ $2^{5.55/3.823}$

R.R = 100/ $2^{1.45}$

R.R = 100/2.73

R.R = 36.63 g.

The mass of radon that decompose = Initial mass of radon - Remaining mass of radon after radioactivity.

Mass of radon that decompose = 100 - 36.63

= 63.37 ≈ 63.4 g

The mass of radon that decompose = 63. 4 g

8 0

3 years ago

What is the number of electrons in an atom that has 20 protons and 17 neutrons.

koban [17]

The answer is 20 because in an atom no of protons equal no of electrons

4 0

3 years ago

What is starch test?​

What is starch test?