23. The following is the chemical equation for the neutralisation of potassium hydroxide and ethanoic acid.
Berikut adalah persamaan kimia bagi tindak balas peneutralan antara kalium hidroksida dan
asid etanoik.
KOH (aq/ak) + CH3COOH (aq/ak) → CH3COOK (aq/ak) + H20 (l/ce) AH = -54.6 kJ moll
In an experiment using 2.0 mol dm-3 potassium hydroxide solution, it is found that 27.3 kJ of
heat is produced.
What is the volume of potassium hydroxide solution used?
Dalam satu eksperimen yang menggunakan larutan kalium hidroksida 2.0 mol dm-3, didapati
27.3 kJ haba dihasilkan.
Berapakah isi padu larutan kalium hidroksida yang digunakan?
A
B
100 cm3
120 cm 3
200 cm3
250 cm3
С
D
13

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products

Which are forms of frozen water? check all that apply. dew frost hail rain sleet