IV. Challenge 1. When magnesium is burnt in the presence of oxygen, over a flame, white ash is formed. This process is called oxidation of magnesium a. Find out what is the ash known as. b. Explain the reaction involved and give the chemical equation for the reaction. 2. Why should we balance a chemical equation? 3. Do the same reactants combine to form the same products? 4. Do all the chemical reactions proceed with the same condition(s) provided to them? 5. In some of the chemical reactions, gas is evolved. Will the law of conservation of energy still hold true in that case?
Answers
1) After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product. This is an exothermic reaction. An exothermic reaction is a term that describes a chemical reaction in which there is a net release of energy (heat).
2) A chemical equation should always be balanced because the law of conservation of mass states that matter can neither be created nor destroyed so in a chemical equation the total mass of reactants must be equal to the mass of products formed i.e. the total number of atoms of each element should be equal on both the sides of a chemical equation.
3) A combination reaction, also known as a synthesis reaction in chemistry, is when two or more substances, or reactants, combine with each other to form a new product. The product will always be a compound. ... Combination of two compounds.
4) A general belief is that all chemical reactions proceed to completion (where all reactants are converted into products). But this is not true in all cases. ... After some time, the concentration of reactants or products becomes constant and we get a state of equilibrium for the system.
5) This is the law of conservation of energy. Energy may change form during a chemical reaction—for example, from chemical energy to heat energy when gas burns in a furnace—but the same amount of energy remains after the reaction as before. This is true of all chemical reactions.
Answer:
2. . A chemical equation should always be balanced because the law of conservation of mass states that matter can neither be created nor destroyed so in a chemical equation the total mass of reactants must be equal to the mass of products formed i.e. the total number of atoms of each element should be equal on both the sides of a chemical equation.
1.When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. ... After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product. This is an exothermic reaction.
3. A combination reaction, also known as a synthesis reaction in chemistry, is when two or more substances, or reactants, combine with each other to form a new product. The product will always be a compound. .