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4 years ago

Which processes represent one chemical change in one physical change

Chemistry

2 answers:

prisoha [69]4 years ago

7 0

decomposition and melting

Alex Ar [27]4 years ago

4 0

Answer:

Decomposition and melting

Explanation:

Decomposition is the process of splitting two or more compounds apart from each other. Usually, the decomposed substance have different chemicals identities hence the reason why it is a chemical process since it causes chemical change. Example is the decomposition of hydrated salts of metals. CuSO4.5H20 is a penta-hydrate salt I.e contains 5 molecules of water. If this compound is heated, two different compounds are formed and changes the chemical identity of the compound. Melting is a process of liquidizing compounds or elements to the point it changes physical state from solid-liquid. Melting does not change the chemical identity of the compound but rather the physical state of the compound.

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Allicin (C6H10OS2) contains 59.9 g of carbon, 21.7 g of hydrogen, 24.4 g of oxygen, and sulfur. What is the mass percent of sulf

EleoNora [17]

We are given the total sample mass of 162 grams which contains carbon, hydrogen, oxygen and sulfur. we are also given with the individual masses of hydrogen, carbon and oxygen .Hence the mass of sulfur is equal to the difference of the total mass of the sample and the summation of the individual masses of elements. mass of sulfur is equal to 56 grams. the mass percent of sulfur is equal to 34.57 percent

7 0

3 years ago

Chlorine atom

irina [24]

Answer:

C. Decomposition of potassium permanganate(Heating)

Explanation:

The equation of the reaction is given as;

2KMnO4 -> K2MnO4 + MnO2(s) + O2(g)

Reactant = 2KMnO4

Products = K2MnO4 + MnO2(s) + O2(g)

A. Oxygen turned in to carbon dioxide

Incorrect option - Oxygen is not the reactant

B. Sulphate and lithium boiled

Incorrect option - Sulphate and lithium are not part of this reaction

C. Decomposition of potassium permanganate(Heating)

Correct option - potassium permanganate decomposed to form K2MnO4 + MnO2(s) + O2(g)

D. None of the above

Incorrect option

8 0

3 years ago

Which two columns have identical data? What do these two columns suggest about the identity of elements?

Gnesinka [82]

Answer:

Explanation:

Atomic number and number of protons have identical data. These two columns suggest that the atomic number is the same as the number of protons in an atom.

3 0

3 years ago

Calculate the number of grams of solid aluminium chloride that will form when a mixture containing 0.150 g of aluminum powder an

Alinara [238K]

Answer:

the answer is B:) have a good day

5 0

4 years ago

What is the concentration of hydronium ion in a 0.121 M HCl solution?

kogti [31]

Answer:

C) 0.121 M

Explanation:

HCl + H₂O = H₃O⁺ + OH⁻

.121M .121M

HCl is a strong acid . It will dissociate almost 100 % so the concentration of acid and hydronium ion formed will be equal . It is to be noted that hydronium ion is formed due to association of H⁺ and H₂O . H⁺ is formed due to ionisation of HCl .

So concentrtion of hydronium ion ( H₃O⁺ ) will be .121 M.

7 0

3 years ago