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Chemistry > Energy Changes > Flashcards

Energy Changes Flashcards

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1
Q

What is an exothermic reaction?

A

An exothermic reaction is one that transfers energy to the surroundings so the temperature of the surroundings increases

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2
Q

What are some examples of exothermic reactions?

A

Combustion, many oxidation reactions and neutralisation (an acid reacting with an alkali)

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3
Q

What are some every day uses for exothermic reactions?

A

Self heating cans and hand warmers

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4
Q

What is an endothermic reaction?

A

An endothermic reaction is one that takes energy from its surroundings so the temperature of the surroundings decrease

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5
Q

What are some examples of endothermic reactions?

A

Thermal compositions and the reaction of citric acid and sodium hydrogencarbonate.

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6
Q

What is an every day use for endothermic reactions?

A

Sports injury packs

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7
Q

How would you know if the reaction is endothermic or exothermic?

A

-100 kJ/mol = exothermic, +100 kJ/mol = endothermic

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8
Q

How do chemcial reactions occur?

A

They only occur when reaction particals collide with eachother and with suficient energy.

The minimum amount of energy the particals must have to react is called the activation energy.

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9
Q

What are reaction profiles?

A

A diagram to display the energy change of a substance

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10
Q

What should reaction profiles be able to do?

A

The can be used to show the

relitave energies of reactiants and products,
the activation energy,
the overall energy change of a substance.

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11
Q

What needs to happen during a chemical reaction?

A

~ energy must be supplied to break bonds in the reactiants

~ energy is released when bonds in the products are formed

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12
Q

How can the energy needed to break bonds and the energy released when bonds are formed be used to find the overall energy change of the reaction?

A

Energy needed to break bonds - Energy released when bonds are formed

Reactiants - products

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13
Q

Bonds in exothermic reactions

A

The energy REQUIRED to BREAK the BONDS in the REACTIANTS is LESS than the ENERGY RELEASED when the BONDS in the PRODUCTS are FORMED

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14
Q

Endothermic bonds

A

The energy REQUIRED to BREAK the BONDS in the REACTIANTS is MORE than the ENERGY RELEASED when the BONDS in the PRODUCTS are FORMED

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Chemistry (2 decks)

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