All categories

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.

You might be interested in

Which is a pair of allotropes?

dexar [7]

1st one I think.........................

8 0

3 years ago

PLEASE HELP! Will give brainliest answer for the right answer! ||| The specific types and sequence of amino acids determine the

vovangra [49]

Amino acids are Proteins,
Lipids are Fatty acids
Nucleic acid which have nucleotides and, build RNA and DNA
Starches are a cause of Carbohydrates, after lots of Polymers.

So, therefore the answer is a)

8 0

4 years ago

The metal rhenium becomes superconducting at temperatures below 1.4 K. Calculate the temperature at which rhenium becomes superc

kotegsom [21]

Answer:

The temperature at which rhenium becomes superconducting is -271.6 ºC.

Explanation:

We can convert the temperature given in Kelvin, which is an absolute scale, into degrees Celsius. which is a relative scale, by a simple algebraic translation, that is:

$T_{C} = T_{K} - 273$ (1)

Where:

$T_{C}$ - Temperature, measured in degrees Celsius.

$T_{K}$ - Temperature, measured in Kelvins.

If we know that $T_{K} = 1.4\,K$ , then the temperature given in degrees Celsius is:

$T_{C} = 1.4\,K-273$

$T_{C} = -271.6\,^{\circ}C$

The temperature at which rhenium becomes superconducting is -271.6 ºC.

8 0

3 years ago

"The difference in our frame of reference between schools of wild Blue Fin Tuna and wild populations of many types of "land base

KengaRu [80]

Answer:

1. Wildlife

2. Seafood

Explanation:

1. Wildlife refers to the species which are not domesticated by the humans and they live as a wild organisms in the areas which are not interfered with the humans. In the given question, the wild creatures that live on the land therefore are considered a part of the wildlife.

2. Seafood refers to the species which are considered as food which humans get from the sea. In the given question, the Blue Fin fishes are considered a seafood therefore.

7 0

3 years ago

Which of the following sentences represents a physical change? sugar dissolves in coffee iron rusts gasoline burns in an engine

MAXImum [283]

<u><em>Answer:</em></u>

Physical changes example is sugar dissolves in coffee
Chemical changes examples are iron rusts, gasoline burns in an engine and a candle burns.

Explanation.

Physical changes depend on only physical state, not on composition, which can be separated by physical means while chemical changes depend on composition and only separated by chemical ways.
As in case of iron rusting, gasoline and candle burn are cases chemical changes bcz they convert into another substance whose composition is different from other as compare to sugar which has same composition in coffee ,only state is changed from solid to liquid.

6 0

3 years ago

Read 2 more answers