science term 1
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35 Terms
Signs a chemical reaction is taking place
Change in temperature
Change in color
Change in odor
Gas formation
Precipitate is forming
It speeds up the reaction process
Catalyst
It is to separate the molecules of water or salt
Electrolysis
It is the shorter hand
Chemical equation
A _ reaction occurs when two reactants interact to form one product
Synthesis reaction
A _ occurs when the reactants breaks down into simpler products.
Decomposition reaction
_ reactions are those that involve the burning of compounds.
Combustion reactions
_ _ reactions also known as single displacement reactions.
Single replacement
A _ _ reaction aka as double displacement reaction. Exchanges ionic species in two compounds to form two completely new compounds
Double replacement
Slows down, limits or completely stops the chemical reaction
Inhibitor
The minimum amount of energy required to start a chemical reaction
Activation energy
The starting substances in a chemical reaction
Reactants
The new substance formed after a chemical reaction
Product
A concise presentation of chemicalusing words or symbols
Chemical equatuon
The reddish brown substance produced when iron reacts with oxygen and moisture
Rust
A visible sign of a chemical reaction observed when vinegar is mixed with baking soda
Formation of gas and bubbles
The side where the reactants are
Left side
The side where the product are written
Right side
The earliest theory in burning. This theory is by Ernst Stahl in the 17th century
Phlogiston theory
He identified the phlogiston theory
Ernst Stahl
Debunked the phlogiston theory as he discovered that instead of releasing a substance a material accurately burns as it react.
Antoine Lavoiser
3 factors in burning
Fuel
Oxygen
Heat
It is the symbol to show combination of reactants or product
+
The symbol to produce, to form or to yield
→
(S) is for
Solid
(L) is for
Liquid
(G) is for
Gas
It is a substance dissolved in water or the symbol (aq)
Aqueous
The symbol of reversible reaction
←
→
Indicates that heat is supplied to the reaction
Heat ∆
→ →
A formula written above or below the yeild sign indicates it is use as a catalyst or solvent
→
Pt
The reactants have more energy than the product
Exothermic reactions
The products have more energy than the reactants
Endothermic reactions
Matter cannot be created or destroyed
Law of conservation of mass