Element, compounds and mixtures Flashcards
(9 cards)
1
Q
what is an element
A
a substance which can’t be split into anything by chemical methods and is made of one type of atom
2
Q
what is a compound
A
a substance which contains 2 or more atoms joined together
3
Q
what’s a mixture
A
2 or more elements that aren’t chemically joined together
4
Q
what’s a molecule
A
2 or more atoms joined together
5
Q
what’s the conservation of mass
A
the total mass of the reactants at the start is equal to the total mass of all the products
6
Q
who organised the periodic table
A
Mendeleev
7
Q
what is needed for making a compound
A
needs energy for the atoms to come together
8
Q
what’s the law of conservation for mass
A
atoms cannot be destroyed
9
Q
how is the periodic table organised
A
metals are on the left side and non-metals are on the right side.
