Conservation of mass - Chemical Quantities Flashcards
What does conservation of mass mean?
Mass always stays the same
As during a chemical reaction, no atoms or lost or made.
This means there are the same
number and types of atoms in each side of a reaction equation
What’s a reason the mass of an atom changes? How does this alter if it is a reactant or product
If gas is involved (one of the reactants) mass increases.
If the gas is a product, the mass could go down. (as it escapes)
What is internal energy?
Total energy stored by particles in a system.
Particles have energy in their kinetic energy stores.
They also have energy in their potential energy stores because of their positions.
The internal energy of a system is the total energy that all its particles have in their kinetic and potential energy stores.
How does heating increase internal energy in a particle?
Transfers energy to its particles.
Increase systems internal energy, which leads to a change in temperature or state (e.g melting or boiling).
How much temperature changes depends on mass of system, its specific heat capacity and how much energy is transferred.
When does a change is state happen?
when particles have enough energy in kinetic energy stores to break bonds holding them together.
Does mass change in a change of state?
No.
Is a physical change not a chemical, so you don’t end up with a new material, it’s just arranged differently.
Means mass is conserved.
