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Dina Kamal

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what did chadwick discover

chadwick discovered neutrons (no charge) and that they are centered in the nucleus with the protons

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80 questions
A group of atoms chemically joined together, can be the same or different
Parts of the atom?
Protons+nutrons in nucleus electrons orbiting
What did chadwick discover
Chadwick discovered neutrons (no charge) and that they are centered in the nucleus with the protons
What did bohr discover
The electrons orbit the nucleus that has the protons
What did ruthford discover
Protons are centered in the nucleas
What did thomson discover and what was his model's name?.
He discovered electrons, his model was called the plum pudding
Group of DIFFERENT atoms joined together
How are periods arranged in the periodic table?
Arranged by the atomic number ,which increases by 1 from left to right
A group of identical atoms
Cannot be broken down any further
The smallest indivisible unit of matter
Factors that affect diffusion
Temp. concentration molecule size surface area
Has more or less of a solute
Diffusion of water molecules across the membrane
Concentration gradient
Difference in concentration
What are the methods of separating mixutes?
Chromatography sieving evaporation/condensation
Indicators to test acids and bases
Litmus paper universal indicator ph meter
What are the indicators of a reaction
Fizzing bubbles change in colour smell heat
What is cellular respiration
Breaking down glucose to get energy with the help of oxygen, to take the energy and release CO2 and water
What are chemical changes
When a new substance is formed or burning
Types of solutions
Hypertonic: solute<solvent hypotonic: solvent<solute isotonic: solute=solvent
What is chromatography
A method of separating mixtures and analyising them
What is a mixture
A mixture of elements/compouds not chemically joined together
How do you find the amount of nutrons?
Atomic number-atomic mass= number of neutrons
Characteristics of clay soil
Small spaces between particles, high in nutrients, high water holding capacity, temp. changes slower.
What is Metamorphism
Process of changing form
What is the difference between intrusive and extrusive igneous rocks
Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet, they don’t reach the surface. .
They cool down very quickly due to the huge difference in temperature which results in...
Results in fine crystals, or no crystals at all like Obsidian.
What are igneous rocks made of and how are they formed
They are made of magma, When magma cools it becomes Igneous rock.
Types of rocks
Igneous rocks, metamorphic rocks, sedimentary rocks
Characteristics of peat soil
High organic matter, large amount of moisture, optimum for gardening
Characteristics of silt soil
Medium spaces between particles, fine particles,can wash away easily, good water holfing capacity
Characteristics of clay soil
Small spaces between particles
What affects the type of igneous rocks
The time it takes the magma to cool, and the location of the cooling
Characteristics of sandy soil
Weathered parts of rocks, large spaces between particles, poor in nutrients, low water holding capacity, good for drainage
Types of soil
Sandy, clay, slit, peat
Different types of soil depend on
The spaces between particles, the nutrients provided
What is soil
Rock and mineral pieces mixed together includes organic material called humus
Minerals can be categorized based on their...
Luster, hardness, streak, colour
What are the characteristics of minerals
1. naturally occuring 2. inorganic 3. specific chemical compositions 4. solid
What minerals is granite made of
Feldspar, quartz, mica
The type of rock depends on....
The size and type of the mineral
What are rocks
Solid substances made out of grains of minerals
Earth's layers
1. crust 2. mantle 3. core
Give ways of erosion
Gravity, Water, Wind.
Mixture of solvent and solute
Types of permeability
Permeable impermeable semi-permeable
In order for diffusion to happen there needs ro be
Concentration gradient permeability
Amount of substamce n a specific area
What molecules are in H2O
2 hydrogen, one oxygen
What is diffusion
Movement of atoms from high concentration to low concentration
There are two types of fossils
Trace fossils,and bone fossils
What are fossils
The ‘remains’ of organisms from millions of years ago, which are found in rocks.
The study of earth
What is erosion
The process which rocks are transported by natural forces such as wind or water.
Example on biotic weathering
Plants growing from rocks which breaks them
Example on chemical weathering
Acid rain, rain in general
What are the types of weathering
Chemical, physical, biotc
Exogenous factors
Weathering, erosion, deposition
Give an example of a metamorphic rock (before and after)
Shale-> slate, limestone -> marble, igneous -> gneiss
What changes does a rock need to change into a metamorphic rock
Changes of heat and pressure to change into another form.
What are the types of sedimentary rocks
Clastic, organic, chamical