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Chemistry

Asked by Cooper

Describe the structure of lithium chloride.

First off, do you know what type of bonding is in lithium chloride? Since it’s made of a metal and a non-metal, it’s gonna be ionic bonding. Which means electrons are being transferred from one atom to another right? Which atom is going to lose electrons and which will gain, and how many? Lithium, being in group 1 has 1 electron in the outer shell. Chlorine in group 7 will have 7 electrons in t... more

Ibrahim's profile picture
Ibrahim Dangra
·

942 students helped

Chemistry

Asked by Kenia

How many moles of NaHCO3 are in 44g

Moles = Mass / Mr Mass = 44g Mr = Na (1x23.0) + H (1x1.0) + C (1 x 12.0) + O (3 x 16.0) = 84.0 Moles = 44g / 84.0 = 0.524 moles

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Hanaan Ahmed
·

216 students helped

Chemistry

Asked by Liv

Some students were discussing whether to make wires for a phone charger from copper metal or graphite. Compare the properties of copper and graphite to decide which material would be better for making the wire (6)?

As carbon is malleable and ductile, this makes it a suitable material for the wire. Being a conductor of heat and electricity is also very important to do this. Graphite, with one delocalised electron per atom, arranged in hexagons with weak covalent bonds between them, can conduct electricity. The covalent bonds, between the layers are strong, taking a lot of energy to break, make graphite a dur... more

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Emma Berwick
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9.5k students helped

Chemistry

Asked by Akinda

Pottqsium iodide with cl2 gas reaction

Potassium iodide + Chlorine--> Potassium chloride + iodine This is a halogen displacement reaction.

Antonio's profile picture
Antonio Valente
·

53 students helped

Chemistry

Asked by Anisa

Identify two sulphur containing reduction products formed when concentrated sulphuric acid oxidises iodide ions

Iodide ions are such a powerful reducing agent that they reduce the (SO4) 2- ions to SO2, and then to elemental Sulphur, and then finally to H2S

Damon's profile picture
Damon Marlow
·

111 students helped

Chemistry

Asked by Vinita

What is the best way to revise for chemistry alevel?

First go through and make sure you understand the content. A-Level Chemistry is very big on concepts! Then, and I really can't stress this enough, do as many questions as possible. Chemistry is an applied science, memorising alone won't really get you far. By answering questions you'll understand what details you've missed out and the overall language + keywords they want you to use in your exam.

Ibrahim's profile picture
Ibrahim Dangra
·

942 students helped

Chemistry

Asked by Chrisshelle

How many molecules are in 123.2g of CO2

First calculate the number of moles of CO2: Moles = mass/Mr Moles (CO2) = 123.2/44 = 2.8 Avogadro’s constant is the number of entities (molecules) in one mole of any substance, in other words there are 6.022 x 10^23 molecules in one mole of any substance. So in 123.2g of CO2, there are 2.8 moles So 2.8 x 6.022 x 10^23 = 1.69x10^24

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Haziq Ibrahim
·

182 students helped

Chemistry

Asked by Kiah

Why is sodium less reactive than potassium

The Sodium atom is smaller than the Potassium atom. This means that the electrons in the sodium atom are closer to the nucleus - it has a stronger electrostatic force of attraction. This also means that it is hard for Sodium to lose an electron. The electrons in the Potassium atom are further away from the nucleus, therefore making it easier to lose them (it has weak electrostatic forces of attra... more

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Rhea Hossein
·

155 students helped

Chemistry

Asked by Ad

Similarity between chemical bond and intermolecular force

A bond binds compounds/atoms by transfer or sharing of electrons (ionic and covalent). A force (intermolecular) is a weaker interaction between compounds/atoms. A similarity would be that they both involve the attraction of compounds to one another

Haziq's profile picture
Haziq Ibrahim
·

182 students helped

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