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In any balanced chemical equation. the number of each type of atom on both side

ID: 1062872 • Letter: I

Question

In any balanced chemical equation. the number of each type of atom on both side of the equation doubled the same decreased by one increased by one dependent on the temperature To balance a chemical equation. you may adjust which of the following? coefficients subscripts formulas of the molecules either the coefficients or the subscripts According to the law of conservation of mass, the total mass of the reacting substances always more than the total mass of the products. always less than the total mass of the products. sometimes more and sometimes less than the total mass of the products. always uju.il to the total mass of the products. Which of the following is not indicative of a chemical reaction. Formation of a gas (bubbies) Material being pulverized or crushed into tiny pieces Change in color Formation of a solid (precipitate) Heat (or a frame) produced or heat absorbed In the following balanced chemical equation which reactant is a solid? CaO(s) + C0_2(g) rightarrow CaCO_3 (s) CaO CO_2 CaCO_3? CaO and CO_2 CaCO_3 and CO_2

Explanation / Answer

1. B. The same (Atoms cannot be produced or destroyed in a reaction, they just undergo changes to form different molecules. So their number would remain the same.)

2. A. Coefficients (Subscripts are numbers that indicate standard forms of substances e.g. O2, N2O. You cannot change them. Only coefficients have to be changed while balancing a chemical reaction)

3. D. Always equal to the total mass of the products (Mass can neither be created nor destroyed. It changes forms. So mass of reactants = mass of products.)

4. B. Material being pulverized or crushed to tiny pieces (This is just a physical change)

5. A . CaO (The state of reactants and products are given in parentheses. s for solid, aq for aqueous, l for liquid and g for gas.)

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