G. Give reasons for the following
1. In chemistry, there is no need to write down complete names or equations in
words..
2. Chemical equation should always be balanced.
3. Both reactants and products can be elements or compounds.
4. White sugar turns black when heated.
H. Differentiate between the following
1. Reactants and products
2. Chemical reaction and chemical equation
3. Word equation and chemical equation
Answers
2- To be useful, chemical equations must always be balanced. Balanced chemical equations have the same number and type of each atom on both sides of the equation. The coefficients in a balanced equation must be the simplest whole number ratio. Mass is always conserved in chemical reactions.
3- In a chemical reaction, substances (elements and/or compounds) called reactants are changed into other substances (compounds and/or elements) called products. You can't change one element into another in a chemical reaction — that happens in nuclear reactions.
4- The heat causes the sugar's atoms to combine with the oxygen in the air, forming new groups of atoms. Energy is released in this chemical reaction in the form of smoke and black soot.
H-1-A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.
2- Chemical equation is the representation of chemical reactions using symbols. Chemical reaction is the process in which one reactant breaks or two or more reactants reacts to form one or more products but chemical equation represents the reaction which had occured by symbols.
3- In word equations, we use words to show what happens using words in a chemical reaction. In chemical equation, we use chemical symbols to show what happens in a chemical reaction.
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Answer:
Where is the 1 no. ans
ans. Yes , there iss no needed to write down complete names or equations in words