Lab safety
What hazard symbol depicts a skull and crossbone?
toxic/poison
Rondbodem kolf
Name two organelles of a plant cell in English.
Cell wall
Cell membrane
Nucleus
Cytoplasm
Vacuole
Chloroplast
Mitochondria
What is the first element in the periodic table?
Hydrogen
Explain what a solution is and give an example.
A solution is a homogeneous mixture where the particles are dissolved into another substance. You cannot see the dissolved particles. For example: sugar in coffee, salt water etc
What hazard symbol depicts a dead tree and a dead fish?
environmental hazard
describe or draw a roundbottom flask.
it's a glass flask with a round bottom and a narrow neck.
which organelle makes food for the plant by photosynthesis?
chloroplast
how many elements are there in total?
98 or 118
Explain what an emulsion is and give an example.
An emulsion is a mixture of one liquid into another liquid. For example: mayonnaise, milk, moisturizer, etc
Give a safety instruction for handling a flammable substance.
For example: wear protective gloves / goggles, keep away from fire, keep away from children, etc
Vertaal naar het Engels:
- reageerbuis
- petri schaal
- trechter
- test tube
- petri dish
- funnel
what does the nucleus do?
It contains DNA and controls the cell.
How are the elements ordered in the periodic table?
from light to heavy.
Explain what a colloid is and give an example.
A colloid is a mixture somewhere in between a solution and a suspension. For example: milk, fog
Describe the hazard symbol for a corrosive substance.
Test tubes dripping a liquid and causing damage on a hand and on a surface.
Describe the difference between a beaker and an erlenmeyer flask.
A beaker is cylindrical in shape with a flat bottom.
An Erlenmeyer flask has a conical shape with a narrow neck and a wider base.
Describe the difference between the cell wall and the cell membrane.
Cell wall is thick and rigid. It protects and supports the shape of the cell.
Cell membrane is thin and flexible. It controls what enters the cell.
what are the properties of metals?
they are shiny, malleable and conduct electricity.
Explain in English the difference between the mixtures salt + water and sand + water. Use the words homogeneous and heterogeneous.
salt + water is a homogeneous mixture. You cannot see the salt in the water.
sand + water is a heterogeneous mixture. The sand is visible and sinks to the bottom when left to settle.
Give an example of a chemical hazard and an example of a biological hazard.
chemical hazard: toxic industrial waste, drugs
biological hazard: virus epidemic, pests, insects
Spell the English word for 'spuit'.
s y r i n g e
Describe the difference between the vacuole and the cytoplasm.
The vacuole stores water and nutrients.
The cytoplasm is a jelly-like fluid where reactions happen.
name an element that is named after a person.
Berkelium
Bohrium
Copernicium
Curium
Einsteinium
Fermium
Flerovium
Gallium
Gadolinium
Hahnium
Lawrencium
Livermorium
Meitnerium
Mendelevium
Nobelium
Oganesson
Roentgenium
Rutherfordium
Samarium
Seaborgium
Explain in English why you sometimes have to shake the bottle before using a product. Use the following words: heterogeneous, particles, settle.
If the particles in a heterogeneous mixture have settled, you need to shake the bottle to disperse the particles into the mixture.