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Na₂S0₄(a?) + BaC\₂{aq)-*- BaS0₄(s) + 2 NaCl(fl<?)

Sodium sulfate Barium chloride Barium sulfate Sodium chloride

Figurę 7.6 In a double replacement reaction, the positive ions in the reac* tants replace each other.

® ' ^{When SOd}‘^{Um hydroxide and} hy*¹¹'⁰⁰¹¹¹⁰"^{0 acid} (^HC» ^react- ^{sodium 211(1}

double replacement reaction? hydrogen ions switch places, forming sodium chloride and water.

NaOH(a^) + HC1 (aq)-- NaCl(aq) + HOH(/)

Combustion Reactions

The buming of a log in a fireplace and the buming of gasoline in the engine of a car are examples of combustion reactions. In a combustion reaction, oxygen is required and often the reaction produces an oxide, water, and heat. For example, methane gas (CH₄) reacts with oxygen to produce carbon dioxide and water. The heat produced by this combustion reaction cooks our food and heats our homes.

CH₄(g) + 20₂(g)-* C0₂(g) + 2H₂0(g) 4- heat

Combustion reactions also occur in the cells of the body in order to metab-olize food, which provides energy for the activities we want to do. We absorb oxygen (0₂) from the air to bum glucose (CóH^Og) from our food, and even-tually our cells produce C0₂, H₂0, and energy.

C₆H₁₂0₆(a<7) + 60₂(g) —-6C0₂(g) + 6H₂0(/) + energy

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