Chemistry Unit 1 Flashcards
What’s the 4 main ways a chemical reaction has occurred?
Colour change
Gas given off
Precipitation
Energy change
What’s the four main changes of state?
Melting
Evaporation
Condensation
Freezing
What’s solute?
The chemical being dissolved
What’s Solvent?
The liquid that the first chemical is dissolved in
What’s solution?
The final mixture of solute and solvent
What must happen for a chemical reaction to take place?
The particles of one substance must collide with enough force into the particles of the other
What can you do to make an experiment more reliable?
Repeat it several times and average your results
What are your four main variables?
Particle size
Concentration
Temperature
Catalyst size
How does decreasing particle size increase reaction rate?
Because more particles are exposed on a larger surface area so more chance of collisions between the two chemicals
How does increasing concentration increase reaction rate?
More particles present in the same volume means the particles are more likely to collide
How does increasing temperature increase reaction rate?
The particles move much faster so are more likely to collide
What are catalysts?
Chemicals that speed up chemical reactions but can be recovered chemically unchanged
What is concentration?
Measure of how many particles are in a particular volume of solution
What are alkali metals?
The most reactive group of metals
What are noble gases?
The most stable group in the periodic table
