2 → C) 2,2 4 → D) 4,1 None of the E) above Explanation: 2 2,1 Start by balancing the O, by putting a 2 in front of H2O (this gives an even number of → O). This creates a total of 4 O on the product side and 4 H. To balance the H, put a coefficient of 2 on the reactant side. 21) The correct chemical formula for magnesium sulfide is A) Mg2S B) Mg3S4 C) MgS D) MgS2 None of the E) Explanation: The correct chemical formula for magnesium sulfide is MgS. This is an ionic compound. The Mg ion has a charge of 2+, the sulfide a charge of 2-, so they bond in a 1:1 ratio. 22) Fe(s) + CuSO4(aq) FeSO4(aq) + Cu(s) → This chemical equation represents a ______________ reaction. A) synthesis B) decomposition C) neutralization single D) replacement
C) 2 → 2,2 D) 4 → 4,1 E) None of the above Explanation: 2 → 2,1 Start by balancing the O, by putting a 2 in front of H2O (this gives an even number of O). This creates a total of 4 O on the product side and 4 H. To balance the H, put a coefficient of 2 on the reactant side. 21) The correct chemical formula for magnesium sulfide is A) Mg2S B) Mg3S4 C) MgS D) MgS2 E) None of the Explanation: The correct chemical formula for magnesium sulfide is MgS. This is an ionic compound. The Mg ion has a charge of 2+, the sulfide a charge of 2-, so they bond in a 1:1 ratio. 22) Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s) This chemical equation represents a ______________ reaction. A) synthesis B) decomposition C) neutralization D) single replacement
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