SCIENCE Word Scramble

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Question	Answer
Atoms	Atoms are the smallest particle of an element.
Electron shell numbers	2,8,8 ...
Physical Change:	Happen when somethings changed but not created a new substance. They're usually reversible. For example, melting ice can be refrozen. Cutting cloth. Shape, size, state,
Chemical Change:	Reaction that changes particles of 2/more particles to make atleast one new substance. Chemical changes are often irreversible. Smell, colour, gas, sound heat &light.
Valency	the number of atoms of a particular element that is combined with one atom of another element to form a molecule
Exothermic reactions	EXpands/releases heat. Energy increases. Rusting iron, settling, chemical bonds, explosions.
Endothermic reactions	Absorbs heat. Energy decreases. Melting ice, evaporation, cooking.
Combustion =	A chemical reaction where substance combines with oxygen, producing a heat, light or flame.
Decomposition reaction	Reaction in which a compound breaks down into two or more simpler substances.
Corrosion	When metals exposed to air and moisture, creating colour change. Occurs when atoms oxidise
Acids	Solution that has an excess of Hydrogen “ions”. E.g; vinegar, citrus Any substance with pH less than 7 when aquious.
Bases	Solution that has an excess of Hydroxide “ions”. Any substance with a pH grater than 7 when aquious.
PH scale; 0=highest or lowest? 14 = highest or lowest?	0 = high e.g hydrochloric acid 14 = low e.g drain cleaner
Whats neutral on th Ph scale?	7
Chemical decomposition=	Chemical breakdown
protons - neutrons - electrons -	Positive subatomic particles found in nucleus of atom Neutral subatomic particles found in nucleus of atom Negative subatomic particles that orbit the nucleus of an atom
Neutralisation =	Stop it from having an effect. Acids and bases are able to neutralise each other.
Precipitate =	Solid that forms as the result of a chemical reaction in aqueous solution.
Collision theory =	The process where atoms collide with eachother in order to form a reaction
Corrosion =	Natural process that converts a refined metal into a more chemically stable oxide. A type of corrosion is rusting
Compound =	Substance made from two different elements joined together.

ION =	When atom loses or gains electrons !!! (not atom anymore but its an ION)
ISOTOPES =	Element with same no. protons, not same no. neutrons.
Group 1 elements (Li, Na, K) . Called the	ALKALINE METALS (+1 charge)
Group 2 elements (Be, Mg, Ca) are called the	ALKALINE EARTH METALS. (+2 charge)
Group 7 elements (F, Cl, Br, I) are called the .	HALOGENS (-1 charge)
Group 8 elements (He, Ne, Ar) are called the	INERT GASSES or NOBLE GASSES (full outer electron orbit and so do not react with other elements.)
Mixtures	2 or more substances NOT chemically combined together (no reacting together).
Molecules	Two or more atoms chemically bond together. (Can have diff elements)
If a molecule includes more than one element, what is it called?	Compound
Measuring pH through?	Indicator and pH scale
Universal Indicator UI	Chemical dye which changes colour.
How to prevent corrosion:	Protective Coatings/Insulators: Applying a protective coating, such as paint, enamel, or plating, can prevent direct exposure of the metal to corrosive substances in the environment.

Created by: AcelyaP