chemical and balancing equations Flashcards
1
Q
what is physical change?
A
a process that causes a substance to change size, shape or state.
2
Q
what is chemical change?
A
a process in which a new substance is formed.
3
Q
define conservation of mass.
A
mass cannot be created or destroyed.
4
Q
what is one of the mass rules?
A
the total mass of the reactants will always be equal to the total mass of the product.
5
Q
finish the sentence. the periodic table is in order of their….
A
atomic or proton number.
6
Q
what is the equation to find the number of neutrons in an element?
A
relative atomic mass - atomic/proton number.
7
Q
using before calculations, how many neutrons does oxygen have?
A
8 neutrons.
8
Q
equation for making a salt.
A
metal + acid —> metal salt/oxide + hydrogen gas.
9
Q
A
