CHEMISTRY HIGH SCHOOL

An atom of chlorine has several valence electrons in itsa. second shell.
b. first shell. End of exam
c. third shell.
d. nucleus.

Answers

Answer 1
Answer:

An atom of chlorine has several valence electrons in its  third shell.

So, option C is correct one.

What is valence electron?

  • The electron/electrons present in the valence shell (outermost shell)of an atom is called valence electrons.
  • The chlorine atom have 7 valence electrons.
  • The chlorine atom has only 2 electrons in its first shell, then 8 electrons in second shell and 7 electrons in its third shell.

learn about valence electrons

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Answer 2
Answer: The correct answer is c) third shell,
The atom of chlorine has only 2 electrons in its first shell, then 4 electrons in second shell and finally 8 electrons in its third.

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How does the law of conservation of matter apply to chemical equationshow does the law of conservation of matter apply to chemical equations?

Answers

According to Law of conservation of matter,"matter can neither be created nor destroyed during a chemical reaction". Therefore this law is very important in a chemical equation. A chemical equation must be balanced to obey this law. Means, the mass of the reactant must equals the mass of products.
For example,
  C  +   O₂ ---------> CO₂
12g + 32g ---------> 44g
In this reaction the total mass of reactant (44g) is exactly equal to the mass of product (44g).
So, keeping the law of conservation of matter it is important to have a balanced chemical equations.

Based on reactivity, which of the following elements can replace iron (Fe) in a compound during a single replacement reaction?Al
Cu
F
Co

Answers

Answer: Option (a) is the correct answer.

Explanation:

Based on reactivity series, the reactivity of some metals in decreasing order is as follows.

      Li, K, Ba, Ca, Mg, Al, Mn, Zn, Cr, Fe, Co, Ni

Thus, it can be seen that Al is more reactive than Fe, so it will replace iron in a single displacement reaction. Whereas cobalt is less reactive than iron hence, it will not replace Fe.

Fluorine being an anion will not replace a cation because in displacement reactions, only a cation can replace another cation and an anion can replace another anion.

Hence, we can conclude that Al will replace iron (Fe) in a compound during a single replacement reaction.

   

based on reactivity, the elements that can replace iron in a compound during a single replacement reaction would be :
Al

Because its higher than the other options in reactivity series

hope this helps

The first person to develop the periodic table was _____. Mendeleev Dalton Bohr Rutherford

Answers

Mendeleev was the first.

Answer:

Mendeleev was the first to develop the periodic table

Explanation:

Which is an example of Temporal Isolation?A.Flowers that bloom in different months.
B.Birds that have different mating calls
C.Fruits flies that mate in different locations.
D.Squirrels that have different fur colors

Answers

Answer:

A. Flowers that bloom in different months

Explanation:

Nature has a way of preventive the interbreeding of closely related species and temporal isolation is one of them. When species reproduce at a different time there is little chance of hybridization (intermixing) between two related species. Since this process occurs before the mating it is also termed as pre-mating isolation.

Answer:

a.) Flowers that bloom in different months

Explanation:

Hello,

Temporal isolation is exposed when two populations are isolated by cause of when they do perform actions according to their instinct. This is considered as large a difference as mating seasons and as small a difference as what time of day they are active. Isolation makes it less likely for two populations to reproduce together, that's why flowers that bloom in different months is a clear example of this biological event.

Best regards.

A scientist develops a new experiment to test atomic theory. His results do not agree with the theory.

Answers

The scientist will repeat the experiment to make sure thathis results are reliable.

The modern atomic model is also sometimes called the __________ model.a. solar system
b. Bohr
c. plum pudding
d. quantum mechanics

Answers

The correct answer is B. The modern atomic model is also sometimes called the Bohr model. This model was introduced by Niels Bohr in 1913. According to this model, an atom is a small, positively charged nucleus which is surrounded by negatively charged particles called electrons.

The answer is B. Bohr
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