9C chemistry 2nd midterm review 1 | Baamboozle - Baamboozle

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25

Why do most reactions start fast and get slower and slower?

The concentration of reactant molecules gets less and less as reactants are converted to products.

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15

What type of reaction is shown by the energy profile diagram?

exothermic reaction

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15

A _____________ is a substance that changes the rate of a chemical reaction and is chemically unchanged at the end of the reaction.

catalyst

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15

For a reaction of X +Y -------> Z, which curve indicates the reactants and which curve shows the products?

Blue curve(products), red curve(reactants)

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15

When the temperature is increased, the chemical reaction time is ___________.

shortened/decreased

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15

The graph shows a reaction between magnesium and HCl solution in a beaker. Reactants are measured. Which curve is performed at a higher temperature?

curve B

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thief

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15

The minimum amount of energy required for a reaction to occur is called the __________ __________.

activation energy

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15

A reaction that absorbs energy from the surroundings is an ___________ reaction.

endothermic

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20

Name 4 factors that affect the rate of reaction.

Temperature, concentration, pressure(gas), particle size/surface area, catalysts

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15

If the sign of enthalpy change is NEGATIVE, the reaction is ___________.

exothermic

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15

In an exothermic reaction, the energy released on forming new bonds is _____________ than that needed to break the old bonds.

greater

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15

If the sign of enthalpy change is NEGATIVE, the reaction is ___________.

exothermic

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15

The heat energy change in chemical reactions is called ______________ change.

enthalpy

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