Science exam questions Flashcards
What is volatile substances
Volatile substances can vaporise
To call something matter what does the item need to have?
Mass and volume
How much kinetic energy does the solid, liquid and gas have?
Solids - not much kinetic energy they can only vibrate
Liquids - more kinetic energy than a solid
Gas - have the most kinetic energy of them all
What are the properties of a Solid?
They have a fixed shape and volume
The particles don’t have a lot of kinetic energy they can only vibrate
They are in a fixed position
What are the properties of a Liquid?
The particles are close together but they can move around
Doesn’t have a fixed shape
Has a fixed volume
Has more kinetic energy than a solid
What are the properties of a Gas?
Move around freely
They have the most kinetic energy
They don’t have a fixed shape or volume
What is tensile strength?
Tensile strength is force needed to break something
What is Compressional Strength?
Compressional strength is when a substance can withstand force
What state of matter can and can’t be compressed?
Solids and liquids can not be compressed only gas can
What is diffusion?
Spontaneous spreading of a substance through a liquid or gas
In which state of matter can diffusion occur fastest?
Diffusion occurs faster in Gas
What is density?
Mass of a certain volume of a substance
What is the formula for density?
Mas
———- = Density
Volume
Or mass divided by volume equals density
What is chemical properties?
Chemical properties is how the substance reacts in a chemical reaction. Eg: permanent colour change, permanent change of state
What is physical properties?
Physical properties is what we can observe and measure without changing its state eg: colour, texture, boiling point and density
When there is one or more cells what is it called?
Multicellular
What is another name for one cell
Single cellular or uni celluar
What are the 2 types of microscopes?
Stereo and light microscope
How do you prepare a slide?
First you get a slide and put a thin layer of the organism. You then add a tiny bit of water on top. If the organism is clear you can add a stain. Then you add the cover slide on top.
What is stain made of?
Iodine
What’s are the 11 things in a microscope?
Eye piece Microscope tube Corse focus knob Fine corse focus knob Arm Objective lense Slide clips Mirror Stage Base Revolving nose peice
Cell membrane
Controls the entry and exit of the cell
Cell wall
The layer surrounding the cell membrane
Nucleus
Controls the centre of the cell
Cytoplasm
A cell inside the cell membrane which Contains organelles
Vacuoles
Large Storage compartment in plant cells
Ribosomes
Creates protein for the cell
Mitochondria
Powerhouse of the cell
Chloroplasts
Allows the plant to make food out of of photo synthesis
What is the process of mitosis
Parent cell | \/ Dna replicates | \/ Daughter cells
Prokaryotic cells are?
The most primitive cellular forms on earth and they are unicellular
Eukaryotic cells are?
More complex and are multicellular
Steam is a…
Liquid not a gas
What is melting point?
A temperature where a substance melts
What is boiling point?
A temperature where a substance boils
2 types of strength
tensile and compressional
What is hardness
The ability to scratch a substance with another substance
What is viscosity
Thickness or gooyness of a liquids