Chemical Quantities Flashcards
Define element
A substance made of only one type of atom, e.g. sodium
Define compound
A substance made of more than one type of atom, chemically joined together, e.g. carbon dioxide
What is the state symbol for a solid?
(s)
What is the state symbol for a liquid?
(l)
What is the state symbol for a gas?
(g)
What is the state symbol for a solution?
(aq)
Define conservation of mass
The mass of the reactants and products is equal, no mass is lost or gained during a reaction
What is a balanced symbol equation?
A symbol equation with equal numbers of each element for both products and reactants
How many hydrogen atoms are present in H2?
Two
How many oxygen atoms are there in CO2?
Two
Why do some reactions appear to lose mass?
At least one of the products is a gas, and is lost to the environment
Why do some reactions appear to gain mass?
At least one of the reactants is a gas, and is taken from the environment
What is the relative atomic mass of a substance?
The mass of an element compared to the mass of the Carbon-12 isotope
What is the relative atomic mass of oxygen, O2?
16
What is the relative formula mass of a substance?
The sum of all the relative atomic masses of the atoms in a compound