Practicals Flashcards
(14 cards)
When carrying a microscope, what two parts of the microscope should you hold?
The arm and base
Total magnification = _________________ * _____________________
Eyepiece magnification * objective lens magnification
What is the point of the ‘Calculating Density’ practical?
To find out the density of different materials.
What equipment do you need for the ‘Calculating Density’ practical?
Eureka can
Measuring cylinder - To find volume
Scale - To find the mass
How could you get errors using the eureka can in the practical where you calculate density
- water may spill out of the sides if you drop the object in too quickly
- he water might not be at exactly the level of the spout
What is the point of the ‘Specific Heat Capacity’ practical?
To find out the specific heat capacity of a material
What equipment would you use to find the specific heat capacity of something?
- Joulemeter: measures energy going into the heater in joules
- Heater: heats the block
- Insulation: stops heat escaping into the atmosphere
- Thermometer: measures the temperature rise.
Why is he temperature slower at first in the ‘Specific Heat Capacity’ practical
Because it takes some time for the block to heat up and for the heat to reach the thermometer
What is the point of the ‘Investigating Osmosis’ practical?
To find out what happens to cells when you put them in different concentrations of sugar and salt solutions.
What are the results of the ‘Investigating Osmosis’ practical
- High concentration of sugar in solution = water moves out of the potato into the solution and the potato gets smaller
- Low concentration = water moves into the potato from the solution and the potato gets bigger
What equipment do you need for the ‘Investigating osmosis’ practical?
- Test tube rack
- Boiling tube
Why would you remove excess water with water paper before weighing the potato in the ‘Investigating Osmosis’ practical
To get an accurate mass by only measuring the potato and not extra water on the outside
