use only Chemistry Paper 1F Foundation Tier Monday 9 May 2005 – Morning Time: 1 hour 30 minutes Materials required for examination Nil Items included with question papers Nil Question Leave Number Blank 1 2 3 4 5 6 7 8 9 Instructions to Candidates In the boxes above‚ write your centre number and candidate number‚ your surname‚ initial(s) and signature. The paper reference is shown at the top of this page. Check that you have the correct question paper. Answer
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A student was assigned a certain task by his teacher in chemistry lab. During the experiment‚ student dropped the flask containing 250 ml‚ 3 molar NaOH solution. Due to this 50 ml of solution out of 250 ml‚ had fallen on the floor. Thinking that teacher may punish him for this mistake‚ he replenished the left over solution with 50 ml of water. The new molarity of NaOH solution will be. (A) 2M (B) 3M (C) 2.5 M (D) 2.4 M 2.* Which of the following molarity values of ions in a aqueous solution
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Biology Key Questions – Lesson #1 1. How many electrons does Mg2+ have? Answer: Mg2+ has 10 electrons. A Magnesium atom has 12 electrons‚ 2 of which are valence electrons. The atom will lose the 2 outermost electrons in order to stabilize its electron shell. The nucleus maintains its 12 protons and becomes a Mg2+ ion. 2. Given that the half-life of the radioisotope carbon-14 is 5730 years‚ how useful do you think this isotope would be for dating bones that are over a million years
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Fill in the Blank 1. The storage area networking technology supported by windows server 208 as a lower cost alternative to fibre channel is caled iSCSI Initiator. 2. The only server roles discussed in this lesson that are not included with the windows server 2008 porduct are Streaming Media Services and 3. DHCP and DNS are known as Infrastructure services. 4. To create a searchable catalog of web wervices on tyou r network‚ you would install the UDDI role. 5. To create
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1. 7.5/8 The height in metres of a ball dropped from the top of the CN Tower is given by h(t)= -4.9t2+450‚ where t is time elapsed in seconds. (a) Draw the graph of h with respect to time (b) Find the average velocity for the first 2 seconds after the ball was dropped h(0)=(0‚450)‚ h(2)=(2‚430.4) = (430.4-450)/(2-0) = -9.8m/s √ (c) Find the average velocity for the following time intervals (1) 1 ≤ t ≤ 4 h(1)=(1‚445.1) h(4)=(4‚371.6) = (371.6-445.1)/(4-1) = -24.5m/s √ (2) 1 ≤ t ≤ 2 h(1)=(1‚445
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1. What is the difference between your self-concept and self-image? What is the difference between your self-concept and your self-esteem? Self-concept is ”the subjective description of who you think you are” or “how you see yourself as a person”. Self- concept js more of a consistent description of yourself ‚ for example‚ how you describe your personality to others.. Your self-image is a more narrowed description of yourself. It is how you perceive yourself in a “particular situation and is varied
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Analytical Chemistry Daniel C. Harris: 7-4‚ 8‚10‚12‚16 7-4) A 1.000g sample of unknown analyzed by Reaction 7-2 gave 2.500g of bis(dimethylglyoximate) nickel(II). Find the wt% of Ni in the unknown. 7-8) The man in the vat. Once upon a time‚ a workman at a dye factory fell into a vat containing a hot concentrated mixture of sulfuric and nitric acids‚ and he dissolved! Because nobody witnessed the accident‚ it was necessary to prove that he fell in so that the man’s wife could collect his insurance
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| |1 |FORM 4 ORIENTATION | | |4/1 – 6/1 | | | |CHAPTER 1: INTRODUCTION TO
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* Question 1 0 out of 1 points | | | Which bond or interaction would be difficult to disrupt when compounds are put into water?Answer | | | | | Selected Answer: | A. hydrogen bond | Correct Answer: | C. covalent bond | | | | | * Question 2 1 out of 1 points | | | What is the atomic number of the cation formed in the reaction illustrated above?Answer | | | | | Selected Answer: | D. 11 | Correct Answer: | D. 11 | | | | | * Question 3 1 out
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PAGE 1 MULTIPLE CHOICE 1. What is the ground-state electronic configuration of an oxygen atom (oxygen: atomic number 8)? (a) 1s22s12p5 (b) 1s22s22p4 (c) 1s12s12p6 (d) 1s22s22p2 2. Which of the following species has an atom that has an unfilled valence shell of electrons? (a) molecular hydrogen‚ H2 (b) hydroxide anion‚ HO- (c) boron trifluoride‚ BF3 (d) water‚ H2O 3. Which of the following compounds is a ketone? (a) CH3CH2COOH (b) CH3CH2CHO (c) CH3CH2CH2OH (d)
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