Chem Triple Flashcards
Name me 2 hazards and the risks for them and the control measure
- Hazard: hydrochloric is an irritant. Risk: it could spill on hands when measuring irritating them. Control measure: wear protective gloves
2.hazard:60 c water bath is hot. Risk: could burn your hand when removing the acid. Control measure: heatproof gloves or use tongs to remove acid from water bath
What is the independent variable for the chemistry prac
Temperature of acid (20-60%)
What is the dependant variable of the chemistry prac
Volume of gas produced in 60 secs
What is the control variables of the chemistry prac
Volume of acid (100cm cubed)
Mass of calcium carbonate (2g)
Reaction time (60s)
What is the resolution
1cm cubed
Range of this prac
60-20=40
Explain why you cannot not comment on the repeatability of your results
Each time was only tested once
Explain how you could determine the reproducibility of your results
Compare my results with someone else
Why has the mean rate increase when temp of acid increases
Causes More kinetic energy
Particles move faster
More successful collisions
Identity the inaccuracy in the investigation and explain how it might effect the results
Gas loss when placing bung in this leads to the mean rate being slower
Suggest how you can improve the apparatus to avoid the inaccuracy
Separate the reactants with a glass plate to avoid gas being produced until bung is on top
Hypothesis of chemistry prac
As concentration increases the volume of gas produced in 60 seconds increase
