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salantis [7]
2 years ago
14

Of the following metals, the one most likely to occur naturally in its pure ( or “free”) form in earth would be (a) aluminum (b)

mercury (c) iron (d) calcium Explain:
Chemistry
2 answers:
gregori [183]2 years ago
8 0

Answer:

The answer is "aluminum" brother.

Explanation:

I've been studying brother.

Phantasy [73]2 years ago
3 0

Answer:

A: Aluminum

Explanation:

You are more likely to find pure aluminum than any other of the materials on the list because aluminum is one of the most abundant materials on Earth, making up about 8% of the Earth's crust, and it can be found in over 270 naturally occuring minerals.

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When magnesium combines with sulfur to form magnesium sulfide, it is oxidized to Mg2+. Which statement is true about this reacti
Vlad1618 [11]
<h3><u>Answer;</u></h3>

B. It involves loss of electrons.

<h3><u>Explanation;</u></h3>
  • Oxidation occurs when electrons are lost by an atom while reduction refers to the gain of electrons by an atom.
  • <u><em>In this case, magnesium atom reacts with sulfur to form magnesium sulfide by loosing two electrons and forming magnesium ion (Mg2+). Therefore magnesium undergoes oxidation.</em></u>
  • Sulfur, on the other hand will gain electrons to form Sulfide ions, therefore it undergoes reduction.
  • Therefore;<em><u> In magnesium sulfide (MgS), magnesium loses two electrons and becomes a cation with a positive-two charge. Likewise, sulfur obtains the two electrons lost from magnesium and becomes an anion with a negative-two charge. However, the overall charge of MgS is zero.</u></em>
6 0
3 years ago
During chemistry, Dan mixes two clear, colorless solution and mixing them produces a yellow precipitate in a clear, colorless fi
kondor19780726 [428]

Answer : Formation of yellow precipitate is the physical evidence that there has been a chemical reaction.

Explanation :

A chemical reaction happens when 2 or more substances chemically react with each other.

There are 4 evidences indicating that a chemical reaction has occurred which are mentioned below.

1. Change in color : On mixing, the reaction mixture can change color indicating that a chemical change may have occurred.

2. Formation of precipitate : A reaction in which a solid is formed on mixing 2 aqueous solutions is called as precipitation reaction. Here, the formation of solid indicates a chemical change.

ex. AgNO_{3} (aq) + NaCl (aq) \rightarrow AgCl (s) + NaNO_{3} (aq)

In above reaction, on mixing the solutions, a white precipitate of AgCl is formed which indicates a chemical change.

3. Evolution of gas : A chemical change also occurs when a gas is evolved on mixing 2 substances.

ex. 2HCl (aq) + Na_{2}CO_{3} (aq) \rightarrow 2NaCl (aq) + H_{2}O (l) + CO_{2} (g)

In above reaction, CO2 gas is evolved and bubbles can be seen in the form of effervescence.

4. Change in temperature : Certain chemical reactions absorb or evolve heat. When a chemical reaction evolves heat, the temperature of the final reaction mixture increases and when it absorbs heat, the temperature decreases. This increase and decrease in temperature indicates a chemical change.

ex.  HCl (aq) + NaOH (aq) \rightarrow NaCl(aq) + H_{2}O (l)

In above reaction, the final mixture becomes hot as the reaction releases heat. ( Exothermic)

Change in odor also indicates a chemical change.

For the given reaction, a yellow precipitate of PbI2 is getting formed.

Therefore formation of this precipitate is the physical evidence that there has been a chemical reaction.

8 0
3 years ago
The following diagram shows an amoeba and a plant. which of the following identifies the primary difference between the two orga
Rzqust [24]
B. the amoeba contains only one cell
8 0
3 years ago
An explosion that releases great amounts of heat is an example of
Damm [24]
<span>An explosion that releases great amounts of heat is an example of an exothermic process. Any reaction that gives off or releases energy as light, electricity, heat, or sound is considered to be exothermic, with "exo" meaning "outside". An explosion is one of the most extreme cases of exothermic reactions.</span>
3 0
3 years ago
How are ironic bonds and covalent bonds different and how are they different?
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Ionic bonds are forces that hold together electrostatic forces of attractions between oppositely charged ions. Ionic bonds have an electronegativity difference greater than or equal to 2. Covalent bonds have an electronegativity difference that is less than 2.
3 0
3 years ago
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