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Science - Chemical Reations - Coggle Diagram
Science - Chemical Reations
Elements, compounds and mixtures
Compound
A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds.
Mixture
A mixture is made from different substances that are not chemically joined. For example, powdered iron and powdered sulfur mixed together makes a mixture of iron and sulfur.
Elements
each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms.
Signs of a chemical reaction
How are they used
They are used all-over our life, this could include: Baking/Cooking food; Digestion and the human bodies' reaction; writing and many more as these are all things we do everyday
Chemical reactions and Physical changes
Physical changes
These are reaction which can normally be reverted, eg: Changing states; hitting something or moulding it etc.
Chemical changes
These are reactions which cannot normally be reverted back into the reactants. These are main
Evidence of them, this could include
Fizzing
Colour change
Bubbling
State change
sound
light
The Alkali Metals
Alkali metals react with water to produce heat, hydrogen gas, and the corresponding metal hydroxide. The heat produced by this reaction may ignite the hydrogen or the metal itself, resulting in a fire or an explosion.
alkali metal, any of the six chemical elements that make up Group 1 (Ia) of the periodic table— some of these are, lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
Periods and Groups
Group
in chemistry, a column in the periodic table of the chemical elements. In a group, the chemical elements have atoms with identical amount of electrons in the outer shell
Period
A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.
Displacement and heat reactions
Displacement
A reation where a stronger element forces a weaker one away
Heat
Endothermic reactions
Reactions which take in energy/ heat from the surroundings. eg of a chemical reation
Exothermic Reations
Reactions which release heat/ energy into the surroundings. eg of a Chemical Reation
metals and non-metal oxides
Non metal oxides
non metal oxides form a acidic solution
non metal + oxygen = non metal oxide
Metal oxides
form a alkali solution
metal + oxygen = metal oxide