All group 1 compounds are white solids that dissolve in water to give colourless solution.

ahh i see thank you!

so 1mol has 6.02×10^23 ions or 5 ions??

1mole has 6.02×10*23 formulas and each formula contain 5 ions

yes in chemistry we hv to memorise the colours, u can search in ur textbook (usually the last chapter) or search online :)

@@xx-zp4or It’s mentions “dilute”. If it’s a dilute aqueous solution, then the products will ALWAYS be hydrogen (at cathode) and oxygen (at anode), regardless of a halogen present, or a lower reactive metal than hydrogen.

The answer is C: Halogens only discharge if the solution is concentrated. In case of diluted solutions (OH)- ions are attracted to the anode and oxygen gas discharge instead . (D) is wrong because it's molten potassium oxide . Potassium will form at the cathode and oxygen at the anode. If a metal less reactive than hydrogen is present it will be discharged instead of hydrogen

Yesss :)

ISA you'll get a higher mark

Because bromine has to be added in 2 adjacent carbons (two carbons that are next to each other ) and that is not happening in ( B)

@@DrMonaSeif thanks, is that the rule for most addition reactions?

@@Channels208bromine is added where the double bond breaks so it means it must add across two carbons next to each other . Apply this logic wherever needed.

@@xdSloshy thx

Are yall having multiple choice in 1.5 hour like i am, if so, good luck yall

Because calcium sulfate is an insolable salt so it cannot be prepared by the excess method (adding carbonate to acid) Insoluble salts are made by precipitation reactions

@@DrMonaSeif doesn’t A produce the same salt?

Calcium carbonate reacts with sulphuric acid to produce calcium sulphate but because calcium sulfate is insoluble so it will Precipitate over the crystals of calcium carbonate prevent further reaction that means the reaction will stop so calcium sulfate cannot be prepared by this method

The oxides that react with water to form acid or oxides that react with a base to form a salt are known as acidic oxides. The oxides that react with water to form a base or oxides that react with an acid to form a salt are known as basic oxides. The oxides which neither react with acids nor react with bases are known as neutral oxides. The oxides which react with acids as well as react with bases to form a salt are known as amphoteric oxides. Carbon monoxide neither reacts with acids nor reacts with bases. Thus, carbon monoxide is a neutral oxide.

*A is wrong:* It describes an acid-metal reaction, not an acid-base reaction. *B is wrong:* It describes a precipitation reaction, not an acid-base reaction. *C is wrong:* It involves a base and a salt to form a precipitate, but it is not a direct acid-base neutralization reaction.

The value of the negative number increase as the number gets smaller

Endothermic reaction absorb energy from the surroundings so the temperature of the surrounding falls (decreases)

@@DrMonaSeif yes, so the temperature of the *surrounding* falls, not the mixture and that’s my point

Group one metals react with water to form metal hydroxide and hydrogen gas magnesium reacts with warm water or steam .

@@DrMonaSeif just magnesium from Group II ??

cuh u just have to multiply the Avogrodas number with the numbers of ions in 1 mole so Avogrodas number * ion in silver nitrate(which are 2 ions) = 1.2 * 10^24 - for 1 mole and for iron oxide avagrodas number * ions in iron oxide (which are 5 ions) = 3.01 * 10^24 this answer is for 1 mole but were looking for 0.25 moles so: 3.01 * 10^24 x 0.25 moles = 7.5 * 10 ^ 23 ez shi

@fearnone0.o Ag is one ion, NO3 is another ion (so just multiply Avogadro constant by 2; not 5 like you did)

@@raidm1838 how does silver nitrate has 2 ions and iron oxide has 5?? how in the world is this possible?? see, it’s AgNO3, so first Ag, second N, third O times 3 as its three times, and in iron oxide, 2 times Fe, and 3 times O, so both have 5 ions… correct me if i’m wrong

@@joy9648 i see, but why aren’t N and O ions themselves, in NO3??

@@fearnone0.o N and O have intramolecular covalent bonds, while NO3 has intermolecular ionic bonds

Not all organic acids are weak acids. While many organic acids, such as acetic acid (found in vinegar) and citric acid (found in citrus fruits), are indeed weak acids and only partially dissociate in water, there are exceptions.

@@DrMonaSeif also I heard that organic acids can sometimes have a lower pH than mineral acids if they exist at higher concentrations is that true?

nuh uh

u can find it on dynamic papers

no bec its not done yetr im setting for it on Tuesday

very funny

Electrolysis is expensive so it can't be used for industrial production of hydrogen gas

@@DrMonaSeif if I wrote that in paper 4 will I still get marks if they ask where you can obtain H

@@NoWif1Ammardon’t think so as the main source of hydrogen is by cracking large chain hydrocarbons and from methane

(Mr )is the mass of one mole

CuO +H2SO4. React Cu + HCl no reaction

@@DrMonaSeif oh i see

Me too😭

Let me know how it went

How'd it go? Which variant are you giving? 0620?