Question

5) Choose the best classification of the reaction represented by the following equation: Pb(NO3)2(ay)+CaClg(ay)-PbCl20)+ Ca(NO3)2(a) A) decomposition B) precipitation C) oxidation-reduction D) acid-base E) combustion 5) 6) 6) Choose the best classification of the reaction represented by the following equation: HBr(ay)+ KOH(ag)KBr(ag) + H20( A) acid-base B) precipitation C) combustion D) combination E) decomposition 7) 7) Magnesium hydroxide, Mg(OH)2, as "Milk of Magnesia" can be used to neutralize excess stomach acid, represented by HCl(ag) according to the chemical equation below. Mg(OH)2s)+ 2HCI(ag)MgCl2(ay)+ 2H20( When 5.00 g of HCl are combined with an excess of Mg(OH)2, what mass of MgCl2 can be produced? [Molar masses: H, 1.01 g/mol ; O, 16.00 g/mol; Mg, 24.31 g/mol; Cl, 35.45 g/mol] A) 2.50 g B) 13.1 g C) 0.957 g D) 6.53 g E) 70.5 g 8) What is the mass of one mole of diatomic hydrogen, H2? 8) A) 1.01 g B) 2.02 amu C) 2.02 g D) 1.01 amu E) 6.022 x 1023 g 9) Incomplete combustion occurs when there is insufficient oxygen to react with a compound. The suffocating gas carbon monoxide is a product of incomplete combustion. How many moles of oxygen gas are required for the complete combustion of 11.0 moles of C6H14, a component of gasoline? 2C6H14(0+19020)-12C02() + 14H20() A) 105 mol O2 B) 209 mol O2 C) 1.16 mol O2 D) 418 mol O2 E) 28.0 mol O2 2

Answer 1

5)
In reactant, there are only aqueous component.
But solid is formed in product.
So, this is precipitation reaction
Answer: B

6)
HBr is acid and KOH is base.
They are reacting to form salt and water.
So, this is acid-base neutralisation reaction
Answer: A

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