What is the difference between an element and a compound in chemistry, and can you provide examples of each?

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Answer 1

Answer:

Answer:

Explanation:

In chemistry, elements and compounds are distinct types of substances with fundamental differences:

**Elements:** Elements are the simplest and purest substances in chemistry, consisting of only one type of atom. Atoms are the building blocks of matter, and each element is defined by the number of protons in the nucleus of its atoms. Elements are listed on the periodic table, where each element is represented by a unique chemical symbol. They cannot be broken down into simpler substances by chemical reactions. For example, oxygen (O), carbon (C), and gold (Au) are all elements.

**Compounds:** Compounds, on the other hand, are substances formed when two or more different elements chemically combine in fixed ratios. These combinations involve chemical bonds, where atoms share electrons or transfer them to achieve stable electron configurations. Compounds have unique chemical formulas that represent the types and numbers of atoms in the compound. Unlike elements, compounds can be broken down into their constituent elements through chemical reactions. A classic example is water (H2O), which is a compound composed of two hydrogen atoms and one oxygen atom.

In summary, elements are pure substances composed of identical atoms, while compounds are substances formed by the chemical combination of two or more different elements in fixed ratios. Elements are found on the periodic table and cannot be broken down further by chemical means, whereas compounds can be decomposed into their constituent elements through chemical reactions.

Answer 2

Answer:

Answer:

Explanation:

In chemistry, elements and compounds are distinct types of substances with fundamental differences:

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Which chemical does nicotine cause the brain to release, leading to a pleasurable sensation?

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Answer:

Dopamine

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Briefly explain why adding insulation to an attic helps reduce heating costs.

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Answer:

Insulation reduces the exchange of heat through a surface such as a wall, attic, duct or roof. In a well-insulated home, less warm air escapes from the house during the winter, and less cool air escapes during the summer, reducing the amount of energy needed for heating and cooling

Ozone is dangerous to human health only when it is found in the what?

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Only when it is found in the atmosphere, because it will create a hole, letting strong UV rays shine down on earth, heating it up, and causing skin cancer in humans and other animals.

Answer:

A) Stratosphere

B) trosphere

C)mesosphere

D)thermosphere

Explanation:

D) thermosphere

In which reaction are electrons transferred from one reactant to another reactant?(1) 2Ca(s) + O2(g) =>2CaO(s)
(2) AgNO3(aq) + KCl(aq) =>AgCl(s) + KNO3(aq)
(3) HCl(aq) + NaOH(aq) =>NaCl(aq) + H2O(l)
(4) H3O+(aq) + OH-(aq) => 2H=O(l)

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Answer : The correct reaction is, (1) $2Ca(s)+O_2(g)\rightarrow 2CaO(s)$

Explanation :

(1) $2Ca(s)+O_2(g)\rightarrow 2CaO(s)$

In this reaction, the oxidation state of calcium (Ca) changes from (0) to (+2) and the oxidation state of oxygen (O) changes from (0) to (-2). In this reaction the electrons are transferred from one reactant (calcium) to another reactant (oxygen). This is a synthesis reaction.

(2) $AgNO_3(aq)+KCl(aq)\rightarrow AgCl(s)+KNO_3(aq)$

In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a double-displacement reaction.

(3) $HCl(aq)+NaOH(aq)\rightarrow NaCl(aq)+H_2O(l)$

In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a neutralization reaction.

(4) $H_3O^+(aq)+OH^-(aq)\rightarrow 2H_2O(l)$

In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a combination reaction.

Hence, the correct reaction is, (1) $2Ca(s)+O_2(g)\rightarrow 2CaO(s)$ in which the electrons transferred from one reactant to another reactant.

The answer is (1). The electrons transfer form one reactant to another means that there is the change of valence. For other choices, the valence of reactant does not change.

PLEASE HELP!!!!!!!!!!!!!!!!
What is a crosscutting concept for global temperature, explain.

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Answer:

They include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

Explanation:

As such, they are a way of linking the different domains of science.

Couldn’t explain it better and longer!

Which of the following chemical equations is balanced?2 Al + 2 CuO ----> A1,0, + 2 Cu
Fe, 0, + 3C --> 2Fe + 3 CO,
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Answers

Answer:

the last one is the answer

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