Physics, 08.10.2019 03:30 chancecharles9oug353

Afood item that is left out of the refrigerator turns brown and forms bubbles and gas. what are the signs that this is a chemical reaction? check all that apply.

a: heat is produced.

b: heat is absorbed.

c: bubbles appear.

d: a precipitate forms.

e: the color changes.

Answers: 2

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Answer from: kodak0531

The answers would be:

C. Bubbles appear

E. The color changes

If you'd like to know more, you can read on:

Although your selections are indications of chemical reactions, if you are referring to only the chemical reaction that occurred in your example, then the two answers are the only choices.

A chemical reaction occurs when the reactants form a new product. Signs of a chemical reaction include change is smell, color and temperature. In some cases, precipitate forms.

Answer from: Uwa

C: Bubbles appear E: The color changes.

Explanation:

A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions.

Example: Oxidation of iron to ferric oxide is a chemical change.

$4Fe(s)+3O_2(g)\rightarrow Fe_2O_3(s)$

Here iron which is grey in color changes first to green and then turns brownish red.

Characteristics of a chemical reaction:

1. change in color

2. heat is gained or lost

3. evolution of gas

4. formation of precipitate

Thus when a food item that is left out of the refrigerator changes colour and evolution of gas takes place and thus would be a chemical change.

Answer from: Quest

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation

Answer from: Quest

the answer to this is proletariats.

hope this : )

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