Topic 2 Chemical Calculations Flashcards
What are reactants in a chemical reaction?
Substances that REACT together.
What are products in a chemical reaction?
Substances PRODUCED in the reaction.
What does a word equation represent?
The names of the substances involved in a reaction.
What is an acid-base reaction often called?
Neutralisation reaction.
What do balanced equations provide?
Symbols and formulas of the substances involved in a reaction.
What is the first step in balancing chemical equations?
Write the formulae for each substance.
What is RAM (Relative Atomic Mass)?
The average mass of a large number of atoms of an element.
What does RMM (Relative Molecular Mass) represent?
The average mass of a molecule calculated by adding the RAMs of all the atoms in the formula.
What is the definition of a mole (mol)?
The amount of a substance that contains as many particles as there are atoms in 12g of carbon-12.
What is Avogadro’s constant?
6.022 x 10^23 particles per mole.
What is molar mass?
The mass of one mole of any substance, measured in g mol^-1.
How is molarity defined?
The number of moles of substance in 1 L of solution.
What is the unit of molarity?
mol L^-1 or M.
What is a solvent?
The liquid in which the solution is formed.
What is a solute?
The substance dissolved in the solvent.
Fill in the blank: An acid reacts with a metal hydroxide to produce a _______ and water.
salt
True or False: The mass of one mole of any substance is numerically equal to its relative molecular mass.
True
What does ppm stand for?
Parts per million.
How do you calculate the concentration of a solution in ppm?
mg per litre or mg per kg.
What happens in a solution when a solute is dissolved in a solvent?
A homogeneous mixture is formed.
What is the molarity of 1 mole of NaCl in 1 litre of water?
1 M.
Calculate the mass of 0.5 moles of hydrochloric acid (HCl).
18.25 g.
What is the balanced equation for the reaction between potassium hydroxide and hydrochloric acid?
KOH + HCl → KCl + H2O.
How many moles of SO2 are there in 16.0 g of sulphur dioxide gas?
0.25 moles.
