Uses of Group 2 Three different calcium compounds are used commonly in agriculture, construction and iron extraction: Limestone?- this is impure calcium carbonate Quicklime?- this is calcium...
Reactions of Group 2 The group 2 elements react with oxygen, water and dilute acids Group 2 Reactions - Observations Reactions with water and oxygen The reaction of group 2 metals wit...
Solubility of Hydroxides & Sulfates Group 2 hydroxides Going down the group, the solutions formed from the reaction of group 2 oxides with water become more?alkaline When the oxides are ...
今天，CollegeBoard正式放出了SAT機(jī)考樣題，并采取直播方式對(duì)機(jī)考模式進(jìn)行講解，同時(shí)，首次正面回應(yīng)了黃牛考位問(wèn)題，小編一起來(lái)和大家分享下。 在今年1月份，CB宣布SAT進(jìn)入機(jī)考時(shí)代，國(guó)際考場(chǎng)在2023年春季率先使...
Trend: Melting Point Melting points of the elements across period 3 A pattern is a little harder to see from the data, but you can see that it rises and falls: Melting points of the period 3...
Trend: First Ionisation Energy The?first ionisation energy (IE1)?is the energy required to?remove?one mole of electrons from one mole of atoms of an element in the?gaseous state?to form one ...
Trend: Atomic Radius Elements in the periodic table are arranged in order of increasing atomic number and placed in vertical columns (groups) and horizontal rows (periods) The elements acros...
Balancing Redox Reactions Balancing equations using redox principles is a useful skill and is best illustrated by following an example It is important to follow a methodical step-by-step app...
Oxidation States Oxidation State Rules A few simple rules help guide you through the process of determining the oxidation state of any element Remember, you are determining the oxidation sta...
Changes Affecting the Equilibrium Constant Changes in concentration If all other conditions stay the same, the equilibrium constant?Kc?is?not affected?by any changes in concentration of the ...
Kc Calculations Calculations involving?Kc In the equilibrium expression each figure within a square bracket represents the concentration in?mol dm-3 The?units?of?Kc?therefore depend on the f...
The Equilibrium Constant, Kc Equilibrium expression & constant The?equilibrium expression?links the?equilibrium constant,?Kc, to the?concentrations of reactants and products?at equilibri...
