Chemicals Flashcards
How do we know a chemical reaction has taken place?
Colour change, Smell, Temperature change, Looks different,Noise
What are the types of Physical Changes?
Change of State, Dissolving
What are the qualities of a Physical Change?
No new substances are made, the change is reversible
What are the qualities of a Chemical Change?
Atoms are rearranged, New substance is made, Irreversible
What are the signs of a Chemical Change?
Flames on spark, Temperature Change, Noise, Smell
What is the first rule applied when naming a chemical?
The name of the metal goes first and the non-metal name ends with __ide.
What is the second rule when naming a chemical?
When three or more elements combine and one of them is oxygen the ending is __ate
What is the third rule when naming a chemical?
If 2 identical elements join together, the name doesn’t change.
What are elements that go in pairs called?
Diatomic molecules
What is Conservation of Mass?
The mass of a substance does not change during a chemical reaction as no particles are lost.
Reactants = Products
What is thermal decomposition?
A thermal decomposition reaction is when the chemical breaks done, using heat, into different chemicals
What is the sign of a thermal decomposition reaction?
There is only one reactant in the chemical equation
What are Exothermic reactions?
Exothermic reactions give energy out. The surroundings heat up.
What are Endothermic reactions?
Endothermic reactions take energy in. The surroundings cool down.
What is an oxidation reaction?
When a substance gains oxygen (atoms)
