ACSBR 2 Chemical Bonding - Assignment ANS

Anglo-Chinese School (Barker Road) A Methodist Institution Founded in 1886 CHEMISTRY DEPARTMENT OF SCIENCE Name: ANSWERS ( ) Class: SEC 3 CHEMICAL BONDING – ASSIGNMENT ALEX LEE/2010 PAGE 1 OF 5 PURE/COMBINED/N-LEVEL Multiple-Choice Questions [20 Marks] TOTAL SCORE / 30 Write in your selected answer for the multiple-choice questions in the boxes provided. 1 2 3 4 5 6 7 8 9 10 D C D C B A B C C D 11 12 13 14 15 16 17 18 19 20 D B B B A B B D C D 1. Metals are defined as elements which A are shiny in appearance. C can conduct electricity when solid. B are malleable and ductile. D readily give away electrons. 2. Two non-metals can form a chemical bond A by delocalizing their valence electrons. C by overlapping their valence shells. B by generating a magnetic attraction. D by transferring electrons to each other. 3. Which of the following elements does not f o r m a n i o n w h i c h h as t h e s a m e e l e c t r o n i c configuration as an argon atom? A chlorine B phosphorus C potassium D sodium 4. The element X has an electronic configuration of 2, 8, 18, 6. What ion will it form? A X2+ B X6+ C X2- D X4- 5. When magnesium forms a compound with oxygen, each magnesium atom A gives four electrons to oxygen. C shares four electrons with oxygen. B gives two electrons to oxygen. D shares two electrons with oxygen. 6. The element Y i s h i g h l y u n r e a c t i v e , a n d d o e s n o t f o r m a n y c h e m i c a l b o n d s u n d e r n o rmal circumstances. Which of the following is a possible electronic configuration of Y? A 2 B 2, 2 C 2, 6 D 2, 8, 8, 2

ALEX LEE/2010 PAGE 2 OF 5 7. A ‘triple covalent bond’ refers to the A sharing of six electrons between a metal and a non-metal. B sharing of six electrons between two non-metals. C sharing of three electrons between two metals. D sharing of three electrons between two non-metals. 8. Which of the following statements pertaining to compounds of calcium is true? A Calcium atoms have a tendency to gain two electrons during bonding. B Calcium bonds with other metallic atoms by sharing electrons. C Calcium bonds with other non-metallic atoms by transferring electrons. D Calcium can form simple molecules which have a low melting point. 9. A molecule of ammonia is shown below. How many bonded electrons are there surrounding the nitrogen atom? A 1 B 3 C 6 D 8 10. A molecule of sulfur trioxide is shown below. How many bonded electrons are there surrounding the sulfur atom? A 2 B 6 C 8 D 12 11. Which of the following best illustrates the bonding present in water? A C B D 12. Which of the following statements about ionic compounds is incorrect? A Ionic compounds are generally more soluble in water than covalent compounds. B Ionic compounds can conduct electricity at room temperature. C Ionic