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nata0808 [166]
2 years ago
6

Select the correct answer from each drop-down menu.

Chemistry
1 answer:
postnew [5]2 years ago
8 0

Answer:

Among the different types of scientific knowledge  hypotheses are likely to be modified or discarded most frequently. Long ago in the 1600's scientists discarded the phlogiston theory because the new evidence didnt support it.

Explanation:

Hypothesis is the assumption of something possible or impossible to draw a consequence and is provisionally established as the basis for an investigation and which can confirm or deny its validity. For this reason, within scientific research, hypotheses are so important and so changeable that they are modified or discarded more frequently within scientific knowledge.

Based on a work by Johann Joachim Becher, the German scientist Georg Ernst Stahl created the phlogiston theory that said combustion occurred with certain materials because they had an “element” or a common flammable principle that was released at the time of burning . This theory was abandoned because there was no evidence, even through scientific experiments, to prove that this theory is true.

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Answer:

A, D,E

Explanation:

I think thats right. Cuz losing electrons makes you cation, gaining electron by a neutral atom makes you negative, and giving up electrons is synonymous to acting like a "metal"

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The tendency of an element to react is closely related to
sweet-ann [11.9K]

<u>Answer:</u> The tendency of an element to react is closely related to the number of valence electrons in the element.

<u>Explanation:</u>

Chemical reactivity is defined as the tendency of an element to loose of gain electrons.

Metals tend to loose electrons and so their chemical reactivity is the tendency to loose electrons.

Non-metals tend to gain electrons and so their chemical reactivity is the tendency to gain electrons.

The number of electrons that an element will loose or gain depends on the number of valence electrons present around that element.

<u>For Example:</u> Chlorine has 7 valence electrons and need 1 electron to complete its octet, whereas sulfur has 6 valence electrons and need 2 electrons to complete its octet.

So, chlorine will gain 1 electron easily than sulfur and thus, is more reactive than sulfur.

Hence, the tendency of an element to react is closely related to the number of valence electrons in the element.

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Based on the activity series provided, which reactants will form products? f &gt; cl &gt; br &gt; i cui2 br2 right arrow. cl2 al
dimaraw [331]

The reactants that will form products will be 2CuI_2 + Br2.

<h3>Activity series</h3>

Elements at higher positions in the activity series will be able to displace those in lower positions in solutions.

Thus:

2CuI_2 + Br2 --- > 2CuBr +2 I_2 because Br is higher than I in the activity series.

Cl cannot displace F in Cl2 + AlF_3 because F is higher than Cl in the activity series.

Also, Cl is higher than Br in the activity series, thus, the reaction Br_2 + NaCl cannot form products.

I cannot displace F, thus, CuF_2 + I_2 cannot form products.

More on activity series can be found here: brainly.com/question/13934381

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