[PDF] 2019 Reach and ICAS Practice Questions Science Paper I.pdf | Plain Text

Science PRACTICE QUESTIONS PA PE R I Read the instructions on the ANSWER SHEET and fill in your NAME , SCHOOL and OTHER INFORMATION . Use a pencil. Do NOT use a coloured pencil or a pen. Rub out any mistakes completely. Yo u MUST record your answers on the ANSWER SHEET . Mark only ONE answer for each question. Your score will be the number of correct answers. Marks are NOT deducted for incorrect answers . Use the information provided to choose the BEST answer from the four possible options. On your ANSWER SHEET fill in the oval that matches your answer . You may use a calculator and a ruler. DO NOT OPEN THIS BOOKLET UNTIL INSTRUCTED. Note : Some UNSW Global assessments are only available online.

© UNSW Global Pty Limited 2 1. The two graphs below show what scientists believe were the concentrations of nitrogen and carbon dioxide in the atmosphere between 4 500 million and 2 000 million years ago. 4500 4000 3500 3000 2500 2000 Time (millions of years ago) 4500 4000 3500 3000 2500 2000 1500 Time (millions of years ago) atmosphere (%) 0 20 40 60 80 Carbon dioxide in Earth’s atmosphere (%) 0 20 40 60 80 Nitrogen in Earth’s There was a time in history when carbon dioxide and nitrogen were presen\ t in equal percentages in the atmosphere. At what time did this occur? (A) 2 000 million years ago (B) 3 500 million years ago (C) 4 200 million years ago (D) 4 500 million years ago

3 © UNSW Global Pty Limited 2. Some molecules are mirror images of each other. They cannot be rotated or moved so that one molecule can be superimposed on the other. The models of molecules shown are mirror images of each other. (B) (C) (D) (B) (C) (D) (A) (B) (C) (D) Here is a model of a molecule of 1-iodoethanol. (B) (C) (D) (B) (C) (D) (A) (B) (C) (D) Which model of a molecule below is a mirror image of the one above? (B) (C) (D) (B) (C) (D) (A) (B) (C) (D)

© UNSW Global Pty Limited 4 Forquestions 3 and 4 use the information below. In forensic science, blood alcohol content is tested at the time of samp\ ling and, if challenged in court, from a stored sample. A student wanted to know how the tightness of the lid of a screw-topped c\ ontainer affected the loss of alcohol over time. He assumed alcohol behaved the same way in blood and \ water. He partially filled three containers with equal quantities of 0.1 g L–1 alcohol solution. He then tightened the lids as follows. • loose lid - tighten until resistance is experienced then turn lid back 1 mm. • firm lid - tighten until resistance is just experienced. • tight lid - tighten until resistance is just experienced then turn a further 1 mm forward. The solutions were then stored in a storage cabinet at 30 °C for a number\ of weeks. His results are shown in the graph. 0.12 0.10 0.08 0.06 0.04 0.02 0 Week 0 Week 1 Week 3 Week 5 Week 7 Standing time Alcohol concentration (g L –1) loose firm tight KEY 3. By how many grams per litre has the concentration dropped after three weeks in the container with the tight lid? (A) 0.005 (B) 0.01 (C) 0.09 (D) 0.095 4. Which hypothesis best applies to this experiment? (A) Blood reacts with alcohol over time. (B) Blood kept in sealed containers should not be used in court. (C) Changes in blood alcohol concentration are due to lid tightness. (D) Changes in temperature affect blood alcohol concentration.

5 © UNSW Global Pty Limited 5. When a solvent in a mixture evaporates, any dissolved solids are left behind. The Soxhlet extractor works very well to extract chlorophyll from leaves using a flammable solvent. There are seven steps in the process. 1. The leaves are placed in a sieve. 2. The solvent evaporates and passes through the bypass sidearm. 3. The solvent vapour enters the condenser. 4. The condenser liquefies the solvent. 5. The solvent drops into the sieve and dissolves chlorophyll from the leaves. 6. When the liquid fills up to the top of the reflux sidearm, it is all siphoned back in the flask. 7. Solvent and chlorophyll collect in the flask. The process repeats from step 2 until the apparatus is switched off. Which of the following statements explains the purpose of this Soxhlet e\ xtractor? (A) Poisonous or flammable solvents can be used safely. (B) The extracting solvent can be heated up to near boiling point. (C) The solvent can be constantly purified before re-use. (D) Chlorophyll can be continuously extracted and concentrated. END OF PAPER water out bypass sidearm flask condenser water in solvent reflux sidearm sieve solvent + chlorophyll heat source

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Print your details clearly in the boxes provided. Make sure you fill in only one oval in each column. Rub out all mistakes completely. Do not use a coloured pencil or pen. HOW TO FILL OUT THIS SH\ EET: USE A PENCIL FIRST NAME to appear on certifi\icate LAST NAME to appear on certifi\icate A A A A A A A A A A A A A A A A A A A B B B B B B B B B B B B B B B B B B B C C C C C C C C C C C C C C C C C C C D D D D D D D D D D D D D D D D D D D E E E E E E E E E E E E E E E E E E E F F F F F F F F F F F F F F F F F F F G G G G G G G G G G G G G G G G G G G H H H H H H H H H H H H H H H H H H H I I I I I I I I I I I I I I I I I I I J J J J J J J J J J J J J J J J J J J K K K K K K K K K K K K K K K K K K K L L L L L L L L L L L L L L L L L L L M M M M M M M M M M M M M M M M M M M N N N N N N N N N N N N N N N N N N N O O O O O O O O O O O O O O O O O O O P P P P P P P P P P P P P P P P P P P Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q R R R R R R R R R R R R R R R R R R R S S S S S S S S S S S S S S S S S S S T T T T T T T T T T T T T T T T T T T U U U U U U U U U U U U U U U U U U U V V V V V V V V V V V V V V V V V V V W W W W W W W W W W W W W W W W W W W X X X X X X X X X X X X X X X X X X X Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ – – – – – – – – – – – – – – – – – – – / / / / / / / / / / / / / / / / / / / DATE OF BIRTH STUDENT IDCLASS DayMonth \bear (optional) (optional) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 A K 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 B L 2 2 2 2 2 2 2 2 2 2 2 2 2 2 C M 3 3 3 3 3 3 3 3 3 3 3 3 3 3 D N 4 4 4 4 4 4 4 4 4 4 4 4 4 E O 5 5 5 5 5 5 5 5 5 5 5 5 5 F P 6 6 6 6 6 6 6 6 6 6 6 6 6 G Q 7 7 7 7 7 7 7 7 7 7 7 7 7 H R 8 8 8 8 8 8 8 8 8 8 8 8 8 I S 9 9 9 9 9 9 9 9 9 9 9 9 9 J T A A A A A A A A A A A A A A A A A A A A A A A A B B B B B B B B B B B B B B B B B B B B B B B B C C C C C C C C C C C C C C C C C C C C C C C C D D D D D D D D D D D D D D D D D D D D D D D D E E E E E E E E E E E E E E E E E E E E E E E E F F F F F F F F F F F F F F F F F F F F F F F F G G G G G G G G G G G G G G G G G G G G G G G G H H H H H H H H H H H H H H H H H H H H H H H H I I I I I I I I I I I I I I I I I I I I I I I I J J J J J J J J J J J J J J J J J J J J J J J J K K K K K K K K K K K K K K K K K K K K K K K K L L L L L L L L L L L L L L L L L L L L L L L L M M M M M M M M M M M M M M M M M M M M M M M M N N N N N N N N N N N N N N N N N N N N N N N N O O O O O O O O O O O O O O O O O O O O O O O O P P P P P P P P P P P P P P P P P P P P P P P P Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q R R R R R R R R R R R R R R R R R R R R R R R R S S S S S S S S S S S S S S S S S S S S S S S S T T T T T T T T T T T T T T T T T T T T T T T T U U U U U U U U U U U U U U U U U U U U U U U U V V V V V V V V V V V V V V V V V V V V V V V V W W W W W W W W W W W W W W W W W W W W W W W W X X X X X X X X X X X X X X X X X X X X X X X X Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ – – – – – – – – – – – – – – – – – – – – – – – – / / / / / / / / / / / / / / / / / / / / / / / / Are you male or fema\Mle? Male Female Does anyone in your h\Mome usually speak a language othe\Mr than English? \be s No School name: Town / suburb: Today’s date: / / Postcode: PAPER EXAMPLE 1: Debbie Bach FIRST NAME LAST NAME ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD EEEE EEE EE EEE EXAMPLE 3: Jamal bin Abas FIRST NAME LAST NAME ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD EEEEEE EEE EEEE EXAMPLE 2: Chan Ai Beng FIRST NAME LAST NAME ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD EE EEE EEEEE EEE S SAMPLE PA PE R I *201911*

TO ANSWER THE QUESTIONS Example: 1 A B C D 2 A B C D 3 A B C D 4 A B C D 5 A B C D START Ari added cordial to water to make a jug of drink. What will be the volume of the drink in the jug? (A) 50 mL (B) 150 mL (C) 200 mL (D) 250 mL The answer is 250 mL, so you would fill in the oval D, as shown. D C B A USE A PENCIL \bO NOT USE A COLOURE\b PENCIL OR PEN S TO ANS For details on how \mwe handle your personal information, please see our Privacy Policy on our we\bsite at unswglobal.unsw.edu.au PA PE R I

9 © UNSW Global Pty Limited TO ANSWER THE QUESTIONS Example: 1 A B C D 2 A B C D 3 A B C D 4 A B C D 5 A B C D START Ari added cordial to water to make a jug of drink. What will be the volume of the drink in the jug? (A) 50 mL (B) 150 mL (C) 200 mL (D) 250 mL The answer is 250 mL, so you would fill in the oval D, as shown. D C B A USE A PENCIL \bO NOT USE A COLOURE\b PENCIL OR PEN S SAMPLE For details on how \mwe handle your personal information, please see our Privacy Policy on our we\bsite at unswglobal.unsw.edu.au PA PE R I \ ICAS Science Practice Questions Paper I © EAA QUESTION KEYKEY REASONING LEVEL OF DIFFICUL TY 1 CIf the graphs ar e plotted on the same set of ax es, they will cross at appr oximately 4 300 million years ago Easy 2 DA is identical to the original, so A is wr ong. B is the same as A but it is has been flipped and r otated, so B is wrong. C is the same as B but has been further r otated, so C is wr ong. Models A, B and C ar e all (1R)-1-iodoethanol. Compar e D and the original; the blue atom is in a differ ent position. D is a differ ent chemical, and is called (1S)-1-iodoethanol. These ar e optical isomers.Easy 3 AThe tight column in the graph shows that after thr ee weeks the concentration in the tight lidded container dr opped from 0.10 gL -1 to approximately 0.095 gL -1 which is a differ ence of 0.005 gL -1. Please note that the question asks for the differ ence after thr ee weeks and not seven weeks. Medium/Har d 4 CIn the e xperiment the tightness of the lid has been alter ed (loose, firm, and tight) and change in alcohol concentration was measur ed.Easy 5 C Hard LEGEND Level of difficulty r efers to the expected level of difficulty for the question. Easy more than 70% of candidates will choose the cor rect option. Medium about 50–70% of candidates will choose the cor rect option. Medium/Har d about 30–50% of candidates will choose the cor rect option. Har d less than 30% of candidates will choose the cor rect option. Because solvent is continuously entering the sieve dissolving any chloro\ephyll remaining in leaves, the maximum amount of chlorophyll will be extracted\e from the leaves and concentrated in the flask.

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