yes, metal oxide has a higher boiling point than non-metals.
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why do we need calcium?
when we get older our bones grow weaker leading to osteopotosis which increasesthe risks of fractures. We need calcium to keep out bones strong so as we get older we have less chance of getting the disease.
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Greenhouse effect:
The ozone layer keeps in the heat so mammals like us can live when the sun is not in the sky but too much heat is being kept in as of us using so much energy and creating carbon emissions.
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Polluntants in cities:
pollution is invisible to us so we do not know how much we are breathing in everyday, this is why its important for us to minter it so in the future it does not create health problems.
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What is carbon monoxide?
carbon monoxide is a poisonous gas
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What can nitrogen dioxide cause?
respiratory symptoms
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What does particle matter link to?
heart disease
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What is radon gas?
Radon gas is produced naturally in rocks. it poses a health risk because it is radioactive and it is a gas meaning itr can be inhaled into the lungs. It is too weak to penetrate the skin.
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London smog:
in 1952 the smog killed more then 4000 people, in 1956 and 1968 new laws were introduced "clean air acts", it encouraged people to use lesss coal and switch to fuels e.g. gas. Factories wer built with higher chimneys or in the countryside.
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story of recycling technology:
thrown away technology are shipped to china. They then dismantle the computers extracting wires, gold etc. when dismatiling lead gas is produced eich is dangerous to breath in.
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story of recycling technology 2:
They then burn the waste causing pollution/ infecting the water/air with fumes,ash,smoke. a experiment was done on kids living near a factory: 80% had lead&zinc poisoning which is harmfull a can cause disorders.
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What are elements?
a substance in which all the atoms are the same. Represented by a chemical symbol found on the periodic table.
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structure of atom:
the nucleas contain neurons and protons with electron orbiting round.
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What is the mass number?
the mass number is the top number and tells us the number of neutrons+ protons in the atom.
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what is the atomic number?
the atomic number is the bottom number and tells us the number of protons in the atom. mass number-atomic numbers=neutrons.
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the charge and mass:
protons= 1+, 1. Neutron=0, 1. Electron= 1-, nothing. electrons are not part of the mass as they weigh nothing. there are equal numbers of protons & electrons
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how are electrons formed?
they are arranged in levels around the nucleas. The level nearest the nucleas is always filled first= 1st lvl= max 2 electrons, 2nd lvl=max 8 electrons, 3rd lvl=max 8 electrons
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electrons outside circle:
each row labels how many electrons they have on the outside circle.
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Noble gases:
He, Ne, Ar are all unreactive this is because their atoms have stable arrangements of electrons (full levels)
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Isotopes:
atoms of the same element, same atomic/ proton number, different mass/ different number of neutrons
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Ionic bonding:
elements react together to form compounds. to do this, atoms join togetjer by losing, gaining or sharing electrons. Non-metals bond together by sharing creating full levels.
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