Do preservatives stop the growth of bacteria?

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1 CHAPTER 1: Science at work Scientific thinking Do preservatives stop the growth of bacteria? Practical report Science Alive 2 for VELS: page 7 Student:. Class:... 9OU WILL NEED X]^X`ZchidX`XjWZ izvheddc WZV`Zg&A k^cz\vg ]diivelvizg,*%ba hvai hi^gg^c\gdy bvh`^c\ivez (WZV`Zgh'*%bA ezcdgbvg`zg# 1. HVai^hdcZd[i]Zbdhil^YZanjhZY[ddYegZhZgkVi^kZh#Hj\\ZhiV]nedi]Zh^hgZaVi^c\idhVaii]Vi XdjaYWZiZhiZYWni]Z[daadl^c\ZmeZg^bZci# Place the chicken stock cube in a 1 L beaker and add 750 ml of hot tap water. Stir the solution with a stirring rod until the stock cube is dissolved and well mixed. Pour 200 ml of the mixture into each of the three 250 ml beakers. Add one teaspoon of vinegar to one of the beakers, and use the pen and masking tape to label the solution vinegar. Add one teaspoon of salt to a second beaker and label the solution salt. Label the third beaker control. Place the three beakers on a warm windowsill for two days. Draw up a table to record your observations. 2. DWhZgkZi]Zi]gZZhdaji^dchV[iZgildYVnh#AVg\ZVbdjcihd[WVXiZg^VbV`Zi]Zhdaji^dch\d XadjYn#9ZhXg^WZi]ZYZ\gZZd[XadjY^cZhhd[ZVX]hdaji^dc# Observations Vinegar Salt Control 3. L]^X]egZhZgkVi^kZlVhi]ZbdhiZ[[ZXi^kZVihidee^c\WVXiZg^Va\gdli] L]VigdaZY^Yi]ZXdcigdaeaVn^ci]^hZmeZg^bZci LVhndjg]nedi]Zh^hhjeedgiZYWni]^hZmeZg^bZci4:meaV^c# CONCLUSION Science Alive 2 for VELS Student Workbook 1

CHAPTER 1: Science at work Science on the move Science on the move Visual learning Science Alive 2 for VELS:

.. The inventors of the car could never have imagined some of the latest developments in cars brought about by

Complete the descriptions of these features on the diagram below.

If the car is involved in a crash, the fi l l within one twenty-fifth of a second and burst from their storage

What happens after that Scientists have tested drivers reactions and eye movements in all types of driving

Better vision ion Engineers have designed stronger windscreens and, so that the thickness of the can be made

The size and the position of the give the driver a better view of the road, making the car safer to drive.

Engineers design treads so that, in wet weather, If this did not happen, Remote keyless entry Most new cars are

A picks up the signal. If the signal matches a code in the, the doors will lock or unlock.

2 CHAPTER 1: Science at work Science on the move Science on the move Visual learning Science Alive 2 for VELS: pages Student:. Class:... The inventors of the car could never have imagined some of the latest developments in cars brought about by science. Scientific knowledge is used to improve the design of every new car. Complete the descriptions of these features on the diagram below. are designed to stop a person colliding with the inside of the car. If the car is involved in a crash, the fi l l within one twenty-fifth of a second and burst from their storage area at about 300 km/h. What happens after that Scientists have tested drivers reactions and eye movements in all types of driving conditions. What other ways can drivers use to find out what is around them? Better vision ion Engineers have designed stronger windscreens and, so that the thickness of the can be made smaller. The size and the position of the give the driver a better view of the road, making the car safer to drive. The lines and grooves in tyres are called. They help keep the car under control in wet weather. Engineers design treads so that, in wet weather, If this did not happen, Remote keyless entry Most new cars are locked and unlocked by pressing a button on a key ring. These key rings have inside them that send out signals. A picks up the signal. If the signal matches a code in the, the doors will lock or unlock. Each time the door is locked or unlocked, the code changes. The code has to change in both the and the, so that they keep recognising each other. help cars stop more safely. If the wheels of a car lock up (stop turning) on a slippery road, then it is almost impossible to stop. work by stopping the wheels from Many injuries occur during accidents when passengers are not properly supported or are thrown from their seats. Headrests are designed to stop the passenger s head from. To stop passengers from being thrown from their seat, all cars are fitted with. How do they work? 2 Science Alive 2 for VELS Student Workbook

3 CHAPTER 1: Science at work Science and ethics Where do you stand? Worksheet 2.3 Science Alive 2 for VELS pages Student:. Class:... How do you feel about certain ethical issues in science? Who else feels the same way? Do they feel this way for the same reasons as you? Who s with you? Why? This activity will help you answer these and other questions about the way people think. In the box on the next page are some statements about the potential benefits and problems created by space exploration. Use your library or the internet to find some background information on this issue. Read the first statement and write down how you feel about it and why. The line shown under each statement is known as a continuum. The six spots on the line are:. Mark the spot that most closely represents your point of view about a statement. Think carefully about your opinion. You could use these prompts as starters. L]nYdndj[ZZai]^hlVn4 L]nYdndji]^c`di]ZgeZdeaZ[ZZa Y^[[ZgZcian4 L]Vi^c[dgbVi^dcXdjaYndjjhZideZghjVYZ di]zghidvxxzeindjged^cid[k^zl4 Repeat this process for all four statements. Your teacher could indicate six spots around the classroom as shown in the figure below. Stand in the spot that represents your point of view about a statement. Find another person standing near the same spot as you and discuss the statement with them. If you are alone, think carefully about your opinion. Science Alive 2 for VELS Student Workbook 3

4 CHAPTER 1: Science at work Science and ethics Worksheet 2.3 page 2 1. Hundreds of billions of dollars have been spent on space exploration money that could be better spent easing world hunger or researching diseases that currently have no cure. 3. Technologies developed for space exploration have been used in Earth areas such as breast cancer detection, fire-resistant material and water purification systems. Side benefits such as these justify space exploration, even if the primary aim is not achieved. 2. Space exploration advances the human race, pushing the boundaries of our knowledge of the universe, and allowing us to understand more about our place in it. 4. Although space exploration is extremely high risk (human fatalities have been high, and loss or malfunction of equipment is frequent), it is a small price to pay for advancing scientific knowledge. 4 Science Alive 2 for VELS Student Workbook

5 CHAPTER 1: Science at work Science literacy Science Alive 2 for VELS: page 22 Student:. Class:... FILL IN THE GAPS 1. h ci^hi/vezghdch`^aazy^c!dgldg`^c\^c!i]zäzayhd[hx^zcxz 2. e Y i^c\/ bv`^c\v[dgzxvhid[l]vib^\]i]veezc 3. iz dad\n/ i]zveea^xvi^dcd[hx^zcxzidi]zyzh^\cd[vyzk^xzdgegdxzhh 4. e dad\n/ VhijYnd[]dli]ZeVgihd[a^k^c\i]^c\hldg`id\Zi]Zg 5. \ / VhX^Zci^hil]dhijY^Zhi]Z:Vgi] 6. dad\^hi/ VhX^Zci^hil]dhijY^Zhi]ZXZaahVcYi^hhjZhi]VibV`ZjeVc^bVah!^cXajY^c\ ]jbvch 7. ] di h/ Vc^YZVdgi]ZdgnjhZYVhi]ZhiVgi^c\ed^ci[dghijYndgZmeZg^bZciVi^dc 8. Z / VhjWhiVcXZi]Vi^hbVYZjed[dcandcZineZd[Vidb 9. kvg Z/ i]z[vxidgi]vi^hx]vc\zy^cvczmezg^bzci 10. / Vjc^id[[dgXZcVbZYV[iZgH^g>hVVX 11. / VhX^Zci^hil]dhijY^Zhi]ZaVlhd[cVijgZ [dgzmvbeaz/bdkzbzci! ]ZVi!a^\]i!\gVk^inVcYhdjcY 12. / VhX^Zci^hil]dhijY^ZhVc^bVah 13. / VhX^Zci^hil]dhijY^Zhi]Zh`nWZndcYi]Z:Vgi]¼hVibdhe]ZgZ 14. / VeZghdcl]djhZhhX^Zci^ÄX^YZVhidYZh^\cVcYWj^aYcZliZX]cdad\n VcYbV`Z^ildg` WRITE A DEFINITION OF THE FOLLOWING TERMS 1. e]vgbvxdad\n/ Xdcigda/ \gvk^in/ X]Zb^hi/ \ZcZi^XZc\^cZZg^c\/ [V^giZhi/ dwhzgkvi^dc/... Science Alive 2 for VELS Student Workbook 5

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Chemistry Safety Worksheet

Chemistry 12 Block: Laboratory Safety A. Lab Preparation Chemistry Safety Worksheet Name: Partner's name(s): Date: 1. Briefly describe where the following pieces of safety equipment are, in our laboratory,