Chemistry Paper on Radioisotope

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1. Which of the following is an important factor in predicting the nuclear stability of an isotope? (A) Atomic radius
(B) Nuclear radius
(C) The ratio of neutrons to protons
(D) The ratio of electrons to protons

2. Which of the following groups contains ONLY acidic substances? (A) Antacid tablets, baking soda, laundry detergents
(B) Blood, oven cleaner, seawater
(C) Milk, tea, drain cleaner
(D) Vinegar, wine, aspirin

3. The apparatus shown is used in a first-hand investigation to determine and compare the heat of combustion of three different liquid alkanols.

Which is the independent variable?
(A) Type of alkanol used
(B) Amount of water used
(C) Amount of alkanol used
(D) Temperature change in the water

4. Bromine, Br2, dissolves in unsaturated hydrocarbons and reacts immediately. Which of the following is the best description of this process?

(A) Bromine is polar and reacts by adding bromine atoms across the double bond. (B) Bromine is polar and reacts by substituting hydrogen atoms with bromine atoms. (C) Bromine is non-polar and reacts by substituting hydrogen atoms with bromine atoms. (D) Bromine is non-polar and reacts by adding bromine atoms across the double bond. 5. What is the IUPAC name of the following compound?

(A) 3,4–dichloro–2–fluorohexane
(B) 3,4–dichloro–5–fluorohexane
(C) 2–fluoro–3,4–dichlorohexane
(D) 5–fluoro–3,4–dichlorohexane

6. In a fermentation experiment 6.50 g of glucose was completely converted to ethanol and carbon dioxide. What is the mass of carbon dioxide produced?
(A) 1.59 g
(B) 3.18 g
(C) 9.53 g
(D) 13.0 g

7. The graph shows the maximum dissolved oxygen concentration in water as a function of temperature at normal atmospheric pressure.

What is the volume of O2 that can dissolve in 10.0 L of water at 25°C and normal atmospheric pressure? (A) 62.0 mL
(B) 63.5 mL
(C) 80.0 mL
(D) 124 mL

Question 8 (4 marks)
Water and ethanol are both used as...
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