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4 years ago

Which statement is true?

Chemistry

1 answer:

Lemur [1.5K]4 years ago

6 0

Answer:

Explanation:

Inn Redox reaction electron transfer takes place between reducing and oxidizing agents. It is not necessary to have oxygen in the reaction, as any chemical species that can undergo electron transfer is enough.

the oxidation and reduction accompany each other, electron lost in oxidation reaction is gained in the reduction reaction.

Hence option C that is In a redox reaction, any increase in the oxidation state of a reactant must be accompanied by a decrease in the oxidation state of a reactant. is correct

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Is Li has 7 valence electrons

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This is false. The amount of electrons in lithium (Li) is not 7, it is 3. There are 3 electrons in lithium.

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How would you figure the number of neutrons in an atom?

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<span>Mass Number = (Atomic Number) + (Number of Neutrons) so you solve for the Number of Neutrons and you get:
Number of Neutrons = (Mass number) - (Atomic Number)

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"When elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical

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Answer: periodic law.

Justification:

1) Although Mendeleev formulated the modern periodic table, ordering the elements according to their physical and chemical properties, there is not such law as Meneleev's Law.

2) The Pauli exclusion principle states that two electrons on an atom cannot have the same 4 quantum numbers, which drives to the fact that only two electrons can stay in the same orbital, each with opposite spin numbers.

3) Hund's rule states that the electrons with the same energy level will occupy the orbitals with the same spin before adding the electrons with the opposite spin.

4) Indeed the periodic law <span>states that the elements are arranged in order of increasing atomic number, and there is a periodic repetition of their physical and chemical properties.</span>

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3 years ago

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#1. Which statement is a correct expression of the Law of Conservation of Mass? A. The total mass is unpredictable in a chemical

Cerrena [4.2K]

These are two questions and two answers.

Question 1: Law of Conservation of Mass

Answer: option B. The total mass remains the same during a chemical reaction.

Explanation:

The law of conservation of mass is a universal law. It states that mass is mass is neither created or destroyed, but is is conserved.

In chemical reactions, that means that, always, the total mass of the reactants equals the total mass of the products or, as the option B. states, during a chemical reaction the total mass remains the same.

Since, in chemical reactions, the atoms are not modified (the atoms just bond in different form or with different atoms), that implies that total number of each kind of atoms in the reactants equals the total number of the same kind of atoms in the products.

That is the basis for balancing the chemical equations and for the stoicheometric calculations.

Question 2 . Which element(s) are not balanced in this equation?

Answer: option A. Only the Fe is unbalanced.

Explanation:

1) Given equation: Fe₂O₃ + 3 CO → Fe + 3 CO₂

2) Count the number of atoms of each kind on each side of the equation

i) Fe

reactant side: 2

product side: 1

Therefore, Fe is not balanced

ii) O

reactant side: 3 + 3 = 6

Product side: 3 × 2 = 6

Therefore, it is balanced

iii) C

reactant side: 3

product side: 3

Therefore, C is balanced.

3) Conclusion: Only the Fe is unbalanced.

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A solid is held in shape by strong forces.

n200080 [17]

Ok thanks for the valuble info.

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