# Recent content by topsyturvy

1. ### RE: variation

oic. thanks a lot. y is directly proportional to x2 x is increased by 100% find the percentage increase in y. so, y= k x2 then y= k x2 y=k 4 x2 so 4 x2 is already increased by 100%? then to find k which is y=k 4 x2 k= y/ 4 x2 find the percentage increase in y, so what i...
2. ### Find the percentage increase in y

y is directly proportional to x2. x is increased by 100%. Find the percentage increase in y. so, y=k x2 y= k (100 + x2) then i went to find the k, which is k= y/ (100 + x2) so i put back the k which i found into y= k (100 + x2) which is : y= y/(100 + x2) (100 + x2) them im...
3. ### Magnesium nitrate is a salt?

well, H2SO4 is a strong acid, while NO- is a weak base?
4. ### Magnesium nitrate is a salt?

er.. i still dont understand why magnesium nitrate does not react with sulphuric acid? i understand what is salt already. thankyou.
5. ### Magnesium nitrate is a salt?

why magnesium nitrate does not react with sulphuric acid?:confused: can somebody help answering? thank you.:smile:
6. ### I need help on Speed of reaction

i need help on the calculation speed of reaction. How to determine whether it is endothermic or exothermic? somebody help pls. thanks lotsa:biggrin:
7. ### Physical properties

does metals has the following? Qns. high melting point, insoluble in water, conduct electricity in solid and liquid. may i know what's the physical properties of covalent compound? do they have low melting point? does ionic compound has high melting point ? can somebody correct...
8. ### Ionic compound

A list of compounds and their formulae are given below. Select those compounds that are IONIC. (choose all that Apply) A.)sulfuric acid H2SO4 B.) glucose C6H12O6 C.) sodium ethanoate CH3COONa D.) magnesium Sulfate MgSO4 E.) Propyl ethanoate CH3COOC3H7 i've chosen C and D. am i...
9. ### Elements, Compounds and Mixture

it's okay. thanks lotsa. :biggrin:
10. ### Elements, Compounds and Mixture

i see. okok. so steel, stainless steel and bronze are all mixtures? so A and D is the answer.?
11. ### Elements, Compounds and Mixture

methane and sodium chloride both are compound.
12. ### Elements, Compounds and Mixture

ok. thanks. but to pick out 2 groups which contain 1 element, 1 compound and 1 mixture. so i should pick D and which one? A.) gold, sodium chloride, steel. ( there's only one element. no mixture.) B.) oxygen,iodine , air ( 2 elements. 1 mixture.) C.) methane, iron(III)chloride, sea-water...
13. ### Chemistry Compound and molecule?

molecule is two or more atom together. then, compound is consist of atoms of two or more different elements?
14. ### Elements, Compounds and Mixture

sodium chloride is an ionic compound. stainless steel is alloy so it's a compound? how about Bronze? nitrogen oxide is a compound.
15. ### Chemistry Compound and molecule?

Only 3 statements are correct. A.) Water is a compound and exist as molecules at rtp. B.) Magnesium chloride is a molecule but not a compound. C.) At rtp, nitrogen exist as diatomic molecules. D.) Rubidium Oxide is a compound but not considered a molecule. E.) Oxygen gas is classified as a...