Topic
Q:
จงอธิบายความหมายของเคมีวิวิเคราะห์ มาพอสังเขป
จงบอกความแตกต่างระหว่างการวิเคราะห์เชิงคุณภาพและการวิเคราะห์เชิงปริมาณ
Q:
What is the molar mass of water (\(H_ { 2} O \))?
Q:
1. จงอธิบายความหมายของเคมีวิเคราะห์ มาพอสังเขป
Q:
2. The density of concentrated Sulphuric acid is \( 1.8 \mathrm{gcm}^{3} \). Calculate the
volume of 3.6 kg of the acid.
(3marks)
Q:
3. Write down word equation to represent the reaction of elements that form the
coumpounds below.
Lead oxide
Sulphur oxide
Potassium chloride
Q:
Predict the relative bond angles in \( \mathrm{BF}_{3} \) and \( \mathrm{SO}_{2} \).
\( \mathrm{BF}_{3} \) bond angles \( >\mathrm{SO}_{2} \) bond angle
\( \mathrm{SO}_{2} \) bond angle \( >\mathrm{BF}_{3} \) bond angles
\( \mathrm{BF}_{3} \) bond angles \( =\mathrm{SO}_{2} \) bond angle
Relative bond angles cannot be predicted.
Q:
In looking at the bolded atoms in the answer choices, which pair consists of molecules having the same geometry?
View Available Hint(s)
\( \mathrm{CO}_{2} \) and \( \mathrm{SO}_{2} \)
\( \mathrm{PCl}_{3} \) and \( \mathrm{BF}_{3} \)
\( \mathrm{CH}_{2} \mathrm{O} \) and \( \mathrm{CH}_{3} \mathrm{OH} \)
\( \mathrm{CH}_{2} \mathrm{CCl}_{2} \) and \( \mathrm{CH}_{2} \mathrm{CH}_{2} \)
Q:
1. a Bir molekül trinitrotoluen de (TNT), \( \mathrm{CH}_{3} \mathrm{C}_{6} \mathrm{H}_{2}\left(\mathrm{NO}_{2}\right)_{3} \), kaç tane atom vardır?
Q:
Ethanol is a possible fuel. Use average bond energies to calculate \( \Delta H_{\mathrm{rxn}} \) for the combustion of ethanol:
\[ \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}(\mathrm{g})+3 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{~g})+3 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \]
Express your answer in kilojoules per mole to four significant figures.
- View Available Hint(s)
Q:
Another potential future fuel is methanol \( \left(\mathrm{CH}_{3} \mathrm{OH}\right) \). Enter a balanced chemical equation for the combustion of gaseous methanol.
Express your answer as a chemical equation.
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