atoms, elements and compounds Flashcards

1
Q

what sort of reaction is bond-breaking

A

energy is absorbed to break bonds so therefore it is endothermic

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2
Q

what sort of reaction is bond-making

A

energy is released so it is an exothermic process

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3
Q

endothermic

A

absorption of heat

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4
Q

exothermic

A

release of heat

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5
Q

calculating energy transferred

A

energy transferred = mass of water heater x specific heat capacity x temp rise

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6
Q

what does 1cm cubed equal to

A

1 gram

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7
Q

what does 1KJ equal to?

A

1000J

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8
Q

what happens in an endothermic reaction.

A

the products are at a lower energy than the reactants

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9
Q

what happens in an exothermic reaction

A

the products are at a higher energy than the reactants

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10
Q

what is the nucleon number? (the mass number)

A

the largest number

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11
Q

what is the proton number

A

the bottom number

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12
Q

what is an isotope

A

atoms of the same element, where the protons and electrons are the same but the neutron number is different

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13
Q

properties of isotopes

A

radioactive isotopes have a radioactive nuclei. the nuclei breaks down and as this happens they release particles or rays. the measurement of the rate of emission of these particles have many uses

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14
Q

uses of radiation

A

cancer treatments

to find leaks in pipelines

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15
Q

what is the group number

A

the amount of electrons on the outer shell. goes across the top

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16
Q

what is the period number

A

the amount of shells an element has. goes down the periodic table vertically.