atoms, elements and compounds

Question 1

what sort of reaction is bond-breaking

Answer 1

energy is absorbed to break bonds so therefore it is endothermic

Question 2

what sort of reaction is bond-making

Answer 2

energy is released so it is an exothermic process

Question 3

endothermic

Answer 3

absorption of heat

Question 4

exothermic

Answer 4

release of heat

Question 5

calculating energy transferred

Answer 5

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

Question 6

what does 1cm cubed equal to

Answer 6

1 gram

Question 7

what does 1KJ equal to?

Answer 7

1000J

Question 8

what happens in an endothermic reaction.

Answer 8

the products are at a lower energy than the reactants

Question 9

what happens in an exothermic reaction

Answer 9

the products are at a higher energy than the reactants

Question 10

what is the nucleon number? (the mass number)

Answer 10

the largest number

Question 11

what is the proton number

Answer 11

the bottom number

Question 12

what is an isotope

Answer 12

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

Question 13

properties of isotopes

Answer 13

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

Question 14

uses of radiation

Answer 14

cancer treatments

to find leaks in pipelines

Question 15

what is the group number

Answer 15

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

Question 16

what is the period number

Answer 16

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