The First question On the answer sheet, put (X) on the best answer for each of the next questions 1. A cube of lead has volume of 6.61mL, and a mass of 75g, what is the density (g/mL) of cube? A) 11 B) 0.088 C) 11.3 D) 1.1102 2. Compound containing 2molC,6molH and 2molN. What is the empirical formula of this compound? A) CH3N B) C2H6N2 C) C3H4N D) C5H7N2 3- Acids convert the color of litmus paper to A) blue B) red C) pink D) colorless 4- Which of the following is a hydrate salt? A) HCl B) Na2SO4.7H2O C) NaOH D) NaCl 5- what is the volume of water? A) 1.5ml B) 2.0ml C) 2.6ml D) 1.4ml 6- How many mL of a 0.532MNaOH solution are required to neutralize 50.0mL of 0.222MHCl ? A) 41.7 B) 20.9 C) 45 D) 29.1 7- The most important thing during lab experiments is - A) neatness B ) getting the correct answer C) finishing first D) safety 8- The limiting reagent is: A) A substance that is consumed first in a reaction B) A substance that conduct electricity C) A product formed in combustion reaction D) A substance found in excess amount in a chemical reaction 9. laboratory instrument that can be used to provide a single, continuous flame is A) A Bunsen burner B) balance C) cylinder D) burette 10. the point at which the indicator changes its color during titration is A) equivelant point B) end point C) phenolpthalene