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Year 8 Science sample

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Question 1 of 5 Investigating

A Year 8 class is making up test solutions. Every step of the method needs its own precaution, and each one deals with a different way of getting hurt. Which precaution belongs with the step of pouring dilute acid out of a large bottle?

The four steps of the method
All four precautions are useful. Only one is useful at this step.
  1. Step 1: pouring dilute acid out of a large bottle
  2. Step 2: warming the beaker on a tripod above a flame
  3. Step 3: grinding a lump of solid down to powder
  4. Step 4: moving the hot beaker back to the bench
  5. A precaution has to act on the harm its own step creates
Question 2 of 5 Natural and processed materials

The formula for sulfuric acid is written H2SO4. A small number after a symbol tells you how many atoms of that element sit in one unit, and a symbol with no number after it stands for a single atom. How many atoms altogether are there in 2 units of sulfuric acid?

How a formula is readone atomone atoma second elementWorked example: one unit of CO2 holds 3 atomsThe worked example is a different substance from the one in the question.Break one unit apart before you think about how many units there are.
Question 3 of 5 Life and living

A bok choy stalk was cut across the base and stood in red dye for 7 hours, then sliced across well above the water line. Looking at that fresh cut face, how is the red dye arranged?

The set up before the stem was slicedthe cut stemred dyesliced hereLeft standing for 7 hoursThe slice is made well above the water line.Think about what carries the water, not about what the stem is made of.
Question 4 of 5 Energy and change

A bottle blown across the top was sounded twice and a microphone drew a trace of each sound on the same screen. Trace A stands 4 cm tall and fits 3 complete waves across the screen. Trace B stands 4 cm tall and fits 5 complete waves. What was done differently the second time?

Height of each trace on the screentrace Atrace BA: 4 cm tall, 3 full wavesB: 4 cm tall, 5 full wavesThe screen settings were not touched between the two sounds.Height and wave count answer two different questions about the sound.
Question 5 of 5 Earth and beyond

A pit was dug at a creek flat outside Shepparton and the four layers were measured down from the surface. A sample was then taken from 38 cm down. What should that sample look like?

The pit wall, measured from the surfacelayer 1, 0 to 3 cmlayer 2, to 20 cmlayer 3, to 50 cmlayer 4, to 80 cmsample depthDepths are measured down from the ground surface.Find the band the depth falls in before you think about what it holds.
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