### Balancing Chemical Reactions Is Consistent With Which Scientific Law?

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• 8 Answer and Explanation: Balancing chemical reactions as represented by chemical equations, is consistent with the law of conservation of mass. This law states that matter cannot be created nor destroyed, and this is represented by a balanced chemical equation.

### How does the chemical equation become balanced?

The balanced chemical equation – The balanced chemical equation is an equation in which the number of atoms entering a reaction equals the number of atoms resulting from this reaction. How to balance the symbolic equation that expresses the reaction of hydrogen gas with oxygen gas to form water : H 2 + O 2 → H 2 O.

To balance the equation, you must compare between the number of atoms of each element in reactants and the number of atoms of the same element in products. When comparing the number of hydrogen atoms and oxygen atoms in reactants and products as follows: H 2 + O 2 → H 2 O We find that the chemical equation is not balanced as the number of oxygen atoms in reactants is more than their number in products.

To balance the number of oxygen atoms, it must be multiplied 2 × H 2 O as follows: H 2 + O 2 → 2 H 2 O We find that the chemical equation is not balanced as the number of hydrogen atoms in reactants is less than their number in products. To balance the number of hydrogen atoms, it must be multiplied 2 × H 2 as follows: 2H 2 + O 2 → 2 H 2 O The chemical equation becomes balanced as the number of atoms of each element in reactants equals the number of atoms of the same element in products.

### Why is the equation of reactants and products not balanced?

First: Law of conservation of matter (matter) – The law of conservation of matter states that the matter is neither created nor destroyed, but it can be changed from one form to another. By applying the law of conservation of matter on chemical reaction, we can define it as follows: Law of conservation of matter (mass): the sum of reactants masses in any chemical reaction equals the sum of products masses.

Achieving the law of conservation of matter in the reaction of magnesium with oxygen, (the atomic masses of Mg = 24, O = 16) 2Mg + O 2 → 2MgO (2× 24) + (2× 16) → 2 (24 + 16) The sum of reactants masses = (2× 24) + (2× 16) = 48 + 32 = 80 gm The sum of products masses = 2 (24 + 16) = 2 × 40 = 80 gm The sum of reactants masses = The sum of products masses, Which achieves the law of conservation of matter.

A chemical equation should be balanced to achieve the law of conservation of matter. Example: Hydrogen gas reacts with chlorine gas to form hydrogen chloride. Express this reaction with a balanced symbolic equation and word equation with achieving the law of conservation of matter,,

Word equation: Hydrogen + Chlorine → Hydrogen chloride Symbolic equation: H 2 + Cl 2 → 2HCl The sum of reactants masses = (2 × 1) + (2 × 35.5) = 2 + 71 = 73 gm The sum of products masses = 2 (1 + 35.5) = 2 × 36.5 = 73 gm ∴ The sum of reactants masses equals the sum of products masses which achieves the law of conservation of matter.

Example: What is the mass of copper (Cu) resulted from the following reaction? Ca + CuSO 4 → CuSO 4 + Cu According to the law of conservation of matter: The mass of calcium + The mass of copper sulphate = The mass of calcium sulphate + The mass of copper.

The mass of copper = (The mass of calcium + The mass of copper sulphate) − The mass of calcium sulphate. The mass of copper = (64 + 159.5) − 136 = 223.5 − 136 = 87.5 gm. Example: Achieve from the following equation if it is balanced or not by applying the law of conservation of matter on it: NaNO 3 → NaNO 2 + O 2, NaNO 3 → NaNO 2 + O 2 → + (2×16) The sum of reactants masses = 23 + 14 + (3×16) = 37 + 48 = 85 gm.

The sum of products masses = + (2×16) = 37 + 32 + 32 = 101 gm. The sum of reactants masses doesn’t equal the sum of products masses. The equation is not balanced because the law of conservation of matter is not achieved.

## What is the balanced chemical equation for hydrogen?

The balanced chemical equation – The balanced chemical equation is an equation in which the number of atoms entering a reaction equals the number of atoms resulting from this reaction. How to balance the symbolic equation that expresses the reaction of hydrogen gas with oxygen gas to form water : H 2 + O 2 → H 2 O.

To balance the equation, you must compare between the number of atoms of each element in reactants and the number of atoms of the same element in products. When comparing the number of hydrogen atoms and oxygen atoms in reactants and products as follows: H 2 + O 2 → H 2 O We find that the chemical equation is not balanced as the number of oxygen atoms in reactants is more than their number in products.

To balance the number of oxygen atoms, it must be multiplied 2 × H 2 O as follows: H 2 + O 2 → 2 H 2 O We find that the chemical equation is not balanced as the number of hydrogen atoms in reactants is less than their number in products. To balance the number of hydrogen atoms, it must be multiplied 2 × H 2 as follows: 2H 2 + O 2 → 2 H 2 O The chemical equation becomes balanced as the number of atoms of each element in reactants equals the number of atoms of the same element in products.

### How does the law of Conservation of matter apply to chemical reactions?

First: Law of conservation of matter (matter) – The law of conservation of matter states that the matter is neither created nor destroyed, but it can be changed from one form to another. By applying the law of conservation of matter on chemical reaction, we can define it as follows: Law of conservation of matter (mass): the sum of reactants masses in any chemical reaction equals the sum of products masses.

Achieving the law of conservation of matter in the reaction of magnesium with oxygen, (the atomic masses of Mg = 24, O = 16) 2Mg + O 2 → 2MgO (2× 24) + (2× 16) → 2 (24 + 16) The sum of reactants masses = (2× 24) + (2× 16) = 48 + 32 = 80 gm The sum of products masses = 2 (24 + 16) = 2 × 40 = 80 gm The sum of reactants masses = The sum of products masses, Which achieves the law of conservation of matter.

A chemical equation should be balanced to achieve the law of conservation of matter. Example: Hydrogen gas reacts with chlorine gas to form hydrogen chloride. Express this reaction with a balanced symbolic equation and word equation with achieving the law of conservation of matter,,

Word equation: Hydrogen + Chlorine → Hydrogen chloride Symbolic equation: H 2 + Cl 2 → 2HCl The sum of reactants masses = (2 × 1) + (2 × 35.5) = 2 + 71 = 73 gm The sum of products masses = 2 (1 + 35.5) = 2 × 36.5 = 73 gm ∴ The sum of reactants masses equals the sum of products masses which achieves the law of conservation of matter.

Example: What is the mass of copper (Cu) resulted from the following reaction? Ca + CuSO 4 → CuSO 4 + Cu According to the law of conservation of matter: The mass of calcium + The mass of copper sulphate = The mass of calcium sulphate + The mass of copper.

The mass of copper = (The mass of calcium + The mass of copper sulphate) − The mass of calcium sulphate. The mass of copper = (64 + 159.5) − 136 = 223.5 − 136 = 87.5 gm. Example: Achieve from the following equation if it is balanced or not by applying the law of conservation of matter on it: NaNO 3 → NaNO 2 + O 2, NaNO 3 → NaNO 2 + O 2 → + (2×16) The sum of reactants masses = 23 + 14 + (3×16) = 37 + 48 = 85 gm.

The sum of products masses = + (2×16) = 37 + 32 + 32 = 101 gm. The sum of reactants masses doesn’t equal the sum of products masses. The equation is not balanced because the law of conservation of matter is not achieved.

### How to balance a chemical equation?

When balancing a chemical equation only change the coefficient numbers, do not change the subscript numbers, as this will change what molecule is reacting or being produced. Using the steps of balancing a chemical equation, a chemical reaction can be given, and then the equation can be written and balanced.

### What is the law of Conservation of matter?

The law of conservation of matter states that matter can not be created or destroyed, it can be rearranged to make a new compound, but it cannot be fully destroyed or created from nothing. This means that in a reaction every molecule needs to be accounted for to be a balanced chemical equation.

## How many substances change during a chemical reaction?

In a chemical reaction, one or more substances change into different substances. Nice work! You just studied 21 terms! Now up your study game with Learn mode. Physical Science: Chemical Reactions Hom 5.2 Anatomy of the Muscular System Part II: Muscle

#### What happens in a chemical reaction?

In a chemical reaction, one or more substances change into different substances. Nice work! You just studied 21 terms! Now up your study game with Learn mode. Physical Science: Chemical Reactions Hom