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Q: If A log is burning in a fireplace. If the amount of oxygen reaching the log is decreased what happened to the reaction rate?
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What is the effect on the rate of a chemical reaction when the concnetration of a reactant is decreased?

When the concentration of the reactant is decreased, the rate of chemical reaction go slow.

Is burning wood in fireplace a chemical reaction?

yes....yes it is.

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The activation energy is decreased by a catalyst.

What is the activation energy needed for a chemical reaction decreased by?

The activation energy is decreased by a catalyst.

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Is oxidation-reduction the reaction that burning wood in a fireplace generate heat and light in the form of flames?

Burning wood in air/oxygen is a combustion reaction, a type of oxidation-reduction reaction.

When you burn a log in the fireplace or burn gasoline in a car is the reaction an endothermic or exothermic reaction?

exothermic..heat is the product

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Burning or rapid oxidation is a chemical reaction which releases heat.

When did Thermidorian Reaction happen?

Thermidorian Reaction happened in 1794.

Why does burning a log in the fireplace involve a chemical reaction while sawing a log in half does not?

Because burning a log in a fireplace involves a chemical change and sawing a log in half only reguires a physical change.

What happens if a chemical substance binds into an enzyme and alters its shape?

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What happened to the rate of a reaction as the reaction progresses?

In general, and depending on the order of the reaction, the rate will decrease as the reaction progresses.