Lab tools, hazard symbols and Safety Data Sheets
Grade 10 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
Safety rule: measure at most 25 mL of 6 M acid at a time. What is the largest volume of 0.5 M acid that can be made, in mL, Ari?
Safety rule: measure at most 10 mL of 12 M acid at a time. What is the largest volume of 1.5 M acid that can be made, in mL, Bo?
Safety rule: measure at most 50 mL of 2 M acid at a time. What is the largest volume of 0.1 M acid that can be made, in mL, Esme?
Read this first
Table
Three SDS excerpts (made-up products), 3 rows. Columns: chemical | Section 2 hazard | Section 7 storage | Section 10 incompatible with. Row 1: Cleaner T | Danger. Oxidizer. Causes serious eye damage. | Store cool, away from fuels and combustible materials. | Flammable liquids and strong acids.. Row 2: Solvent S | Danger. Highly flammable liquid and vapor. | Store in a flammables cabinet, away from heat and sparks. | Oxidizers.. Row 3: Acid A | Danger. Strong acid. Causes severe skin burns and eye damage. | Store in a corrosives cabinet, away from bases. | Bases and metals..
The stockroom has a flammables cabinet, a corrosives cabinet and an open shelf. Where should Cleaner T go, Jun?
- On the open shelf, apart from the other two, since Section 10 lists flammables and acids
- In the corrosives cabinet, since its Section 2 lists eye damage and Acid A is kept there
- In the flammables cabinet, since Danger products are stored together in one place
Cleaner T spills beside Solvent S bottles. Which entries together justify moving S away at once, Luz?
- Cleaner T's Section 2 (oxidizer) and Solvent S's Section 10 (oxidizers), plus S's Section 7
- Solvent S's Section 2 (flammable) with Acid A's Section 7 (away from bases), both Danger
- Cleaner T's Section 7 (store cool) with its Section 2 eye-damage warning for anyone nearby
Glycerin trial (example data)
measurement reading cylinder and glycerin (g) 55.20 empty cylinder (g) 23.70 volume (mL) 25.0 student's density (g/mL) 2.21 accepted density (g/mL) 1.26 The student's density is far above the accepted value. Which error explains it, Milo?
- The meniscus was read at the top edge, a slip of well under 1 mL
- The empty cylinder was not subtracted: 55.20 ÷ 25.0 gives exactly 2.21
- A bubble in the liquid made the volume read too large, which raises the density
A wet cylinder leaves about 1.0 mL of water when Noah measures 20.0 mL of 6.0 M acid, then dilutes to 250 mL. The target was 0.48 M. What results?
- About 0.50 M, a little above 0.48 M, since the wet glass adds volume
- About 0.46 M, a little below 0.48 M, since only about 19 mL was acid
- Exactly 0.48 M, since the final volume is still 250 mL
Four density trials of one stone (example data)
trial rise (mL) density (g/mL) 1 10.0 2.67 2 10.1 2.64 3 10.0 2.67 4 11.1 2.41 Each trial used the same 26.70 g stone. Which error explains trial 4, Pia?
- The empty dish was not subtracted, which would lower the density as trial 4 shows
- The stone was weighed wet, which would lower the density as trial 4 shows
- A bubble on the stone added about 1 mL to the rise, so the density fell
Accepted densities (rounded)
material density (g/mL) aluminum 2.70 quartz 2.65 zinc 7.14 tin 7.29 iron 7.87 magnesium 1.74 A stone measures 2.67 ± 0.04 g/mL. Does the measurement identify it, Ren?
- Yes, aluminum: 2.70 is the lone metal in the table near 2.7, so it is the match
- No: the range 2.63 to 2.71 includes both quartz at 2.65 and aluminum at 2.70
- Yes, quartz: 2.65 is the closest accepted value to 2.67, so it is the likely match
Student A reports 2.69 ± 0.06 g/mL and student B reports 2.71 ± 0.01 g/mL for aluminum. Which statement is supported, Zee?
- A alone agrees with aluminum, since 2.69 is closer to 2.70 than B's value
- Both agree with aluminum, but only B's range also excludes quartz at 2.65
- B is less reliable, since 2.71 is farther from aluminum's 2.70 than 2.69 is
