Chemistry Revision Question Bank 2023 PDF

When salt is dissolved in water, the salt is the \_\_\_\_\_\_\_\_\_\_\_\_. a. Solute b. Solvent c. Solution d. Product 2. What answer is Avogadro's number? a. [8.02 × 10^23^]{.math.inline} b. [6.02 × 10^13^]{.math.inline} c. [60.2 × 10^23^]{.math.inline} d. [6.02 × ...

When salt is dissolved in water, the salt is the \_\_\_\_\_\_\_\_\_\_\_\_. a. Solute b. Solvent c. Solution d. Product 2. What answer is Avogadro's number? a. [8.02 × 10^23^]{.math.inline} b. [6.02 × 10^13^]{.math.inline} c. [60.2 × 10^23^]{.math.inline} d. [6.02 × 10^23^]{.math.inline} 3. Why is the density of water ice less than that of liquid water? a. More space between molecules b. Less space between molecules c. The hydrogen bonds break d. The presence of ions make hydrogen bonding less effective 4. What is the name of the effect of water droplets being attracted to each other? e. Adhesion f. Cohesion g. Solubility h. Capillary action 5. Water molecules contain hydrogen bonds \_\_\_\_\_\_\_\_\_\_\_\_\_. a. Between molecules b. Within molecules c. Both a) and b) d. Neither a) or b) 6. What is the molarity when 2.5 moles of calcium chloride are dissolved to make a 5000 mL solution? a. b. [\$\\frac{1}{2000}\$]{.math.inline} M c. 5 M d. [\$\\frac{1}{200}\$]{.math.inline} M e. 0.5M 7. What is the molarity when 1 mole of calcium chloride are dissolved to make a 200mL solution? a. [\$\\frac{1}{200}\$]{.math.inline} M b. 5 M c. [\$\\frac{0.2}{1}\$]{.math.inline} M d. 0.5 M 8. What is the Molar Mass of Silicon Dioxide? a. 64.06g/mol b. 44.09g/mol c. 60.09g/mol d. 52.06g/mol 9. Which of these statements are **incorrect** about salinity? i. Pure water dissolves salts because it is a polar molecule j. A salt consists of a positive ion and a negative ion k. As salinity increases, density decreases l. Cations are attracted to anions 10. How many atoms does a water molecule have? a. 1 b. 2 c. 3 d. 4 11. **What is the molecular formula for aluminium sulfate?** m. [Al~2~^3+^(SO~4~)~3~]{.math.inline} n. [AlSO~4~]{.math.inline} o. [Al~2~(SO~4~)~3~]{.math.inline} p. [Al^2^SO~4~^3^]{.math.inline} **[Describe and Explain Short-Answer]** **21. What is the difference between cohesion and adhesion? Explain why they are both important in relation to water. (3 marks)** **22. Explain why water ice is not as dense as liquid water. (3 marks)** **23. Explain why hydrogen bonds form. (4 marks)** **29. Explain how salinity affects the freezing point of water. (4 marks)** **30. Draw a diagram of a water molecule, showing all electrons, polarity and molecule shape. Label the type of bonding present also.** **[\ ]** **[Calculation Short-Answer]** 1. **A block of metal occupies a volume of 25L and weighs 60kg. What is its density? Provide your answer in g/mL. (3 marks)** 2. **A block of aluminium occupies a volume of 13.5mL and weights 55.6g. What is its density? (2 marks)** 3. **Calculate the amount of moles there are in 90 grams of silicon? Answer to 1 decimal place. (2 marks)** 4. **Find the volume of silver metal that weighs exactly 5000g, if the density of silver is 17.6g/cm^3^. Answer to 2 decimal places. (2 marks)** 5. **A rectangle block of silver weighs 500g. The dimensions are 11cm by 4.6cm by 1.1cm. From this, what is the density of the silver block? Answer to 2 decimal places. (3 marks)** 6. **How many grams of Calcium Sulphate is needed to create 275 mL of a 5M solution? Answer to 2 decimal places. (3 marks)** 7. **If the density of a wood plank is 0.84 g/mL and the dimensions are 12cm x 10 cm x 8 cm, what is the mass? Answer to 2 decimal places. (3 marks)**