Select the correct image. Which structure is a valid representation of a hydrocarbon molecule?
Н
1
Н-С-Н.
Н
Н
Н
Н
Н
1
н-с-н
Н Н
Н Н
1 1
1 1
Н-С—С—С—С—С-Н
1 1 1 1
Н Н H Н Н
H— С—С=С—С—С-Н
1
1 І
1
Н Н Н Н Н
Н
1
H-C-H
Н Н
Н Н
1 1
Н-С—С—С С— С
1
1
1
Н Н Н Н Н
Н
1
H-C-H
Н
Н
1
1
H-C— C-CEC— C-H
Н н н н Н

Can anyone (a-level) a student was analysing a carbonate compound, mco3, containing an unknown group 2 metal, m. the student carried out thermal decomposition on 0.730g of the carbonate and measured the volume of gas produced. mco3 (s) mo (s) + co2 (g) the student collected and measured 120cm3 of carbon dioxide. 1 mol of carbon dioxide occupies 24 000 cm3 under these conditions. calculate the molar mass of the group 2 carbonate and hence deduce the identity of the group 2 metal, m.

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.