Find the limits, if they exist. Show all your work for full credit. If you find any vertical/horizontal asymptotes state them clearly. Only algebraic proofs please: Do not use the calculator to enter numbers and find the limit – no credit is awarded for calculator work. You can check your answer with the calculator.   a.

 QUESTION 6    A learner sets up the apparatus as shown in the diagram below:     Right click on the button below to open the image in a new “tab”.          6.1 The decomposition reaction of hydrogen peroxide During this reaction, hydrogen peroxide (H2O2) decomposes into oxygen and water.   6.1.1  What is the purpose of the MnO2 during the above reaction? (1) 6.1.2  Give the balanced equation for this reaction. (3) 6.1.3  Indicate whether the number of molecules is conserved. (2) 6.2 The learner now does a second reaction during which hydrochloric acid (HCl) reacts with zinc.     Right click on the button below to open the image in a new “tab”.          6.2.1 Balance the following equation:   Zn(s)  +  HCl(aq)  →  ZnCl2(aq)  +  H2(g) (2) 6.2.2   The hydrogen that is collected can now react with the oxygen in the air by holding a flame at the mouth of the test tube. Write down a balanced chemical equation for this reaction. (3) 6.2.3 Is the reaction between hydrochloric acid and zinc an example of a physical or chemical change? (1)     [12]  

1.3   Melk wat suur word, word geklassifiseer as… (2)

VRAAG 3 ‘n Onbekende vloeistof word afgekoel vanaf 100oC na -100oC. Beskou die volgende grafiese voorstelling hiervan, en beantwoord dan die vrae wat volg:   Regsklik op die onderstaande blou knoppie om die diagram vir Vraag 3 in ‘n nuwe blad oop te maak.    3.1  Wat gebeur met die stof tussen t=8 minute en t=12minute? (1) 3.2 Is die kinetiese energie van die stof besig om TOE TE NEEM, AF TE NEEM of DIESELFDE TE BLY tussen t=8 minute en t=12 minute? (2) 3.3 Bepaal die smeltpunt van die stof. (2) 3.4 In watter fase is die stof by: 3.4.1 temperatuur van 90oC (1)  3.4.2 temperatuur van – 90oC (1)     [7]

QUESTION 2  Consider the following substances and then answer the questions that follow:    2.1 Draw the Lewis diagram for Ammonia (2) 2.2 Identify the type of bond in H2O (2) 2.3 Identify the type of bond in NaCl (2) 2.4 Which compound is also known as “dry ice” (1)     [7]

European, white American, and Native American views on property were the same.

   In which of the following sets do all species have the same number of electrons (isoelectronic species)?

What is meant by DOM and DOF For this question, you must write answers only in the text space provided for this question. There is no need to submit any answer on paper for this question.

According to the Balmer-Rydberg equation, electromagnetic radiation with wavelength λ = 97.2 nm will be absorbed when an electron undergoes which of the following transitions? You can use one of the following equations:

List two Dynamic Model Methods For this question, you must write answers only in the text space provided for this question. There is no need to submit any answer on paper for this question.