Consider the following statements, choose the incorrect one(s):1 point[A]. The chemical equation is balance to satisfy the law of conservation of mass in chemical reaction.[B]. We should never change the formula of an element or compound to balance and equation.[C]. Those reaction in which heat is evolved are known as exothermic reactions.[D]. When Methane (CH4) burns in oxygen of air it forms carbon monoxide and water vapour.

Which law represents a balanced chemical equation? A. Avogadro’s hypothesis B. ideal gas law C. law of conservation of mass D. Newton’s first law of motion E. Newton’s second law of motion

How does a balanced chemical equation show the conservation of mass?A.It shows that the mass of the products is greater than the mass of the reactants when a reaction increases the moles of substances.B.It shows that the number of each type of atom stays the same.C.It shows that the total number of moles of substances stays the same.D.It shows that the mass of the reactants is greater than the mass of the products when gases are produced by the reaction.

__ uses chemical formulas and symbols to describe a chemical reaction.Multiple choice question.The law of conservation of massA chemical lawSynthesisA chemical equation

Translate the following statements into chemical equations and then balance them.(a) Hydrogen gas combines with nitrogen to form ammonia.(b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide.(c) Barium chloride reacts with aluminium sulphate to give aluminium chlorideand a precipitate of barium sulphate.(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen

(a) State the law that is followed by balancing a chemical equation.(b) Balance the following chemical equation: Na + H3O → NaOH + H2