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Aleksandr-060686 [28]
2 years ago
5

Which of the following is an example of potential energy? 1.bouncing ball 2.swinging a bat 3.book on a table 4.falling leaf

Chemistry
1 answer:
azamat2 years ago
3 0

Answer:

book on a table

Explanation:

a book on a table is an example of potential energy because when you slide the book off the table or just slide it in general it becomes  kinectic energy

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Which is an example of an exothermic process?
Gwar [14]

1) Answer: A hot pack feels warm when chemicals in it combine.

Explanation: Reactions or process in which heat is released(produced) are known as exothermic reactions or process and those in which the heat is absorbed are known as endothermic reactions or process.

If a beaker feels cools when chemical in it react then it means the chemicals have absorbed the heat energy from its surroundings and so it is an example of an endothermic process.

A hot pack feels warm when chemicals in it combine means the energy is released in the chemical reaction and so it is an example of an exothermic process.

Plants use the sun's energy for photosynthesis which is a process of forming food for the plants. Energy acts as a reactant in this process and so it is an example of endothermic process.

Frying an egg by heating it on a stove is an example of an endothermic process as the heat is required to fry the egg.

So, the only exothermic process is the second one, "A hot pack feels warm when chemicals in it combine."

2) In the given equation, heat is written as a product means the heat is released in the equation and so it is an example of an exothermic reaction.

So, the correct choice is the last one " It is exothermic because energy is released."

5 0
3 years ago
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What earths layer is broken up like puzzle pieces
lilavasa [31]

The crust because there are tectonic plates.

4 0
3 years ago
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hichkok12 [17]

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D 1 and 3 only I am not sure

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6 0
2 years ago
Consider the statement: "Copper is a red-brown element obtained from copper sulfide ores by heating the ores in air, which forms
Misha Larkins [42]

Answer:

1, just I) color.

Explanation:

Physical properties are the properties that can be observed without changing the composition of a substance, such as color, temperature, density, and boiling point.

A physical change is a change in the substance that only modifies its aggregation state, such as solidification, and boiling.

Chemical properties are the properties that need a reaction to being observed, such as the combustibility, which needs a combustion reaction to being quantified.

When a chemical reaction occurs, and the composition of the substance change, it's a chemical change.

So, the heating copper with carbon is a chemical reaction, and purification by electrolysis is too. Color is the only physical property.

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Alex73 [517]
<span>Forward & falling. Hope this helps!</span>
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