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)
What are the reactants?
The reactants are the starting substance and are on the left side of the equation.
What are the products?
The products are the new substance made and are on the right side of the equation.
What is the rule when you are balancing the equation?
When balancing an equation, you can only place the number infront of the chemical! E.g 2Mg and not Mg2
What are the 3 different states of matter?
Solid, Liquid, Gas
What is an element?
An element is a substance with only one type of atom.
What is a compound?
A compound is a substance with 2 or more types of atoms which are chemically joined togteher.
What is a molecule?
A molecule is a substance which has 2 or more same types of atoms chemically joined together
What is a combustion reaction?
A combustion reaction is when a fuel reacts with oxygen to produce carbon dioxide and water.
What is a chemical reaction?
A chemical reaction is a process where atoms are rearranged to make new substances with the atoms joined together in different ways.
