Single Replacement & Decomposition
<h3>Further explanation</h3>
Given
Two chemical reactions
1. Cl2 + 2NaBr ⇒2NaCl + Br2
2. 2NaCl ⇒2Na + Cl2
Required
Type of reaction
Solution
Equation 1 : A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds
General formula :
A + BC ⇒ AC + B
Equation 2 : the decomposition reaction of a compound into its constituent elements or compounds
General formula :
AB ⇒ A + B
Carbon is a chemical element of atomic number 6, a non metal which has two main forms.
<h3><u>Answer;</u></h3>
Reduces the amount of work needed to move an object.
<h3><u>Explanation;</u></h3>
- <u>A simple machine is any device that reduces human effort to do work. They include, levers, inclined plane, pulleys, etc</u>.
- Simple machines make work easier by multiplying, reducing, or changing the direction of a force and also by changing the distance the force acts through.
- Simple machines cannot change the amount of work done, however, they can reduce the effort force that is required to do the work. This is to mean, machines can neither increase or reduce the energy involved in doing work.
A piece of copper that has a mass of 290 g has 2.748 *10²⁴ molecules.
<h3>What is a mole ?</h3>
A mole is a unit of measurement which relates the molar mass to the amount of the number of atoms and molecules .
1 mole = 6.022 *10²³ molecules or atoms
Molecular weight of copper = 63.55
290 g of Copper = 290/63.55 = 4.56 moles
1 mole has 6.022 *10²³ molecules or atoms
4.56 mole has 4.56 *6.022*10²³ molecules or atoms
= 2.748 *10²⁴ molecules.
A piece of copper that has a mass of 290 g has 2.748 *10²⁴ molecules.
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An electron has a high probability of being in certain regions. Hence, option C is correct.
<h3>What is the meaning of electron cloud?</h3>
The system of electrons surrounding the nucleus of an atom.
The electron cloud model tells us that electrons are found in defined energy states outside of the nucleus of the atom. The lowest possible state for an electron is called its ground state.
The energy levels can only hold a certain number of electrons at any time and the organization of these electrons in the electron cloud is called the atom's electron configuration.
Energy levels describe distances from the nucleus in which electrons can be found. There is a maximum number of electrons that can be found at any particular energy level due to the limitations of its size.
Hence, an electron has a high probability of being in certain regions.
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