CHEMISTRY HIGH SCHOOL

The balanced equation below represents a molecule of bromine separating into two bromine atoms.Br2-->Br + Br
What occurs during this change?
(1) Energy is absorbed and a bond is formed.
(2) Energy is absorbed and a bond is broken.
(3) Energy is released and a bond is formed.
(4) Energy is released and a bond is broken.

Answers

Answer 1
Answer: (4) Energy is released and a bond is broken. This happens because when the bromine molecule splits, the energy that was holding the two atoms together is released.
Answer 2
Answer:

Answer is: (2) Energy is absorbed and a bond is broken.

This energy is called bond-dissociation energy.

Bond-dissociation energy is the measure of bond strength in a chemical bond.

Bond energy of bromine molecule (sigma bond) is energy needed for breaking up one molecule of bromine into two bromine atoms.

When two bromine atoms (Br) form molecule of bromine (Br₂), than energy is released and bond is formed.

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What is the total number of electrons in the valence shell of an atom of aluminum in the ground state?(1) 8 (3) 3
(2) 2 (4) 10

Answers

The answer is (3) 3. The outer shell of an atom is called valence shell. And the ground state is the lowest energy state of an atom. Aluminum has a electron distribution of 2, 8, 3. So the outer shell has 3 electrons.

Answer:

C. 3

Explanation:

If you look at aluminum (Al) in the Periodic Table of the Elements, you will see that its electron configuration is 2-8-3.  The last number indicates the valence shell, which contains three electrons.

In which reaction is soap a product?(1) addition (3) saponification
(2) substitution (4) polymerization

Answers

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What was concluded about the structure of the atom as the result of the gold foil experiment?(1) A positively charged nucleus is surrounded by positively charged particles.
(2) A positively charged nucleus is surrounded by mostly empty space.
(3) A negatively charged nucleus is surrounded by positively charged particles.
(4) A negatively charged nucleus is surrounded by mostly empty space.

Answers

Answer is: 2) A positively charged nucleus is surrounded by mostly empty space.

Rutherford theorized that atoms have their charge concentrated in a very small nucleus.

This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles (helium atom particles, consist of two protons and two neutrons).  

Rutherford observed the deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.

That is different from Plum Pudding model, because it shows that most of the atom is empty space.

The conclusion about the structure of the atom as the result of the gold foil experiment is that a positively charged nucleus is surrounded by mostly empty space. The answer is number 2. Also, he concluded that an atom was not an empty space but rather, the electrons are scattered.

Are all elements abbreviated with one or two letters? If not, name some that aren't.

Answers

Answer:

Some elements are abbreviated with more than two letters such as the Ununtrium (Uut), Ununpentium (Uup), Ununseptum (Uus) and Ununoctio (Uuo).

Explanation:

Some elements have intuitive symbology, such as Chlorine (Cl), among others, which are represented by the first letters that make up the name. However, there are others who receive symbols that do not remember the name of the element, such as Lead (Pb). Regardless of the similarity between the names and the symbol of the elements, most of them have the symbol composed of one or two letters, except for the elements Ununtrium (Uut), Ununpentium (Uup), Ununseptum (Uus) and Ununoctio (Uuo).
Some elements that are not abbreviated with one or two letters on the periodic table are Ununoctium (Uuo) and Ununtrium (Uut).

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Answers

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Answers

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