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Feliz [49]
3 years ago
9

Which statement about scientific explanations is true?

Chemistry
2 answers:
nadezda [96]3 years ago
8 0

Answer:

The correct option is A

Explanation:

Scientific explanations are made as a result of carefully researched and experimented procedures in order to arrive at a logical and probable conclusion on a subject matter. However, these scientific explanations are usually made based on facts as at the time it is been made. These facts could however be incomplete making them subject to change when more facts are produced.

For example, the Dalton's atomic theory became modified after new evidences emerged that atom is not the smallest unit of matter (with the discovery of electrons, protons and neutrons), atoms of the same elements are some times not alike in all aspect (the discovery of isotopes) among other modifications made to his theory.

This example among others indicate that scientific explanations are open to change/modification.

VashaNatasha [74]3 years ago
7 0
A. Scientific explanations are open to change.
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pickupchik [31]

Answer:

The elements become less reactive.

Explanation:

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction and reactivity increases because of greater electron affinity.

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased. The electron affinity decreases because of shielding effect and thus atom become less reactive.

7 0
2 years ago
Consider the generic reaction: 2 A(g) + B(g) → 2 C(g). If a flask initially contains 1.0 atm of A and 1.0 atm of B, what is the
irina1246 [14]

Answer:

b. 1.5 atm.

Explanation:

Hello!

In this case, since the undergoing chemical reaction suggests that two moles of A react with one moles of B to produce two moles of C, for the final pressure we can write:

P=P_A+P_B+P_C

Now, if we introduce the stoichiometry, and the change in the pressure x we can write:

P=1.0-2x+1.0-x+2x

Nevertheless, since the reaction goes to completion, all A is consumed and there is a leftover of B, and that consumed A is:

x=\frac{1.0atm}{2}=0.5atm

Thus, the final pressure is:

P=1.0-2(0.5)+1.0-(0.5)+2(0.5)\\\\P=1.5atm

Therefore the answer is b. 1.5 atm.

Best regards!

3 0
2 years ago
What is the main reason scientists perform experiments
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B, they then interpret that data to find their answers
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Answer:

3

Explanation:

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