I would first get the student to find the elements on the Periodic Table, and work out how many valence electrons each atom had. Then I would get them to …
The reaction is as follows:
2H2 + O2 -> 2H2O
This means that for every 2 molecules of Hydrogen gas, one molecule of Oxygen is needed …
Bonding is when two atoms join together; this happens through movements of electrons to help create a full outer shell of electrons. Ionic bonding is when this takes place between …
Copper ions are positively charged. So they are attracted to the negative electrode. The negative electrode is called cathode.At the cathode, each copper ion gains two electrons. They are said …
Reactivity increases down the group. The number of electron shells increases down the group. Therefore the outer electron is further away from the nucleus. Consequently, the attraction between the outer …
1)Always write out the reaction first;
2NaCl+CaCo3-->Na2Co3+CaCl2
2)Now underneath calculate the Relative Formula Mass using a periodic table for each of the compounds.
CaCo3=100/ Na2Co3=106
3)Now always write out the …
Sulfer, when burned in the presence of oxygen, will form sulfer dioxide (SO2). This can then dissolve in rain water, forming sulfuric acid. This will then fall to …
Atoms involved in a covalent bond will share a pair of electrons in order to acheive a full outer shell in both atoms. Each atom will donate a single electron …
This is called thermal decomposition. CaCO3 decomposes into calcium oxide (CaO) and Carbon Dioxide (CO2).
Thermally decompose the calcium carbonate:CaCO3 -> CaO + CO2Now mix the CaO with water:CaO + H2O -> Ca(OH)2
Emulsions are solutions of water and oil. With small droplets of one suspended in the other.Common examples of emulsions:- Mayonnaise, Milk (oil droplets in water)- Butter, Margarine (water …
Bromine water:- Turns colourless when mixed with a double bond (unsaturated)- Remains Orange-Brown when mixed with a C-C single bond (saturated)
Poly(ethene) is formed when several monomers of ethene (an alkene) are joined together. Ethene can take part in this type of reaction as it is has a double bond (it's …
A hydrocarbon is a molecule that contains only hydrogen and carbon atoms.
Any two of the follwing properties are suitable answers:
Low boiling points, low viscosities or high flammability.
The basic principle about chemical reactions is that whatever goes in one end, will undoubtedly come out the other!
The simplest way to make sure your reactions are correct is …
2K(s) + 2H2O(l) = 2KOH(aq) + H2(g)
Potassium (K) is a group 1 metal, which is a solid.
Water (H2O) reacts with Potassium to …
Ionic bonds are electrostatic forces of attraction between oppositely charged ions.
Metals have delocalised electrons which are free to move and carry charge throughout the sea of cations.
1) Thermal Decomposition
2) Forms: CaO + CO2
C6H12O6 + 6O2 --> 6CO2 + 6H2O