U1-1 - Rate of Reaction and Energy Changes Flashcards
State 4 signs of a chemical reaction
Colour change
Effervescence
Precipitation
Energy/temperature change
Gas forming in a chemical reaction
(fizzing)
Effervescence
Solid forming in a chemical reaction (from liquids)
Precipitation
Reaction rate
How quickly the products are formed
What does ‘M’ mean in ‘1 M hydrochloric acid’?
Molar
(It’s a unit for concentration)
Effervescence
Gas forming in a chemical reaction
(fizzing)
A substance which speeds up (catalyses) a reaction without getting used up.
Catalyst
Precipitation
Solid forming in a chemical reaction (from liquids)
To increase reaction rate, we can __________ concentration.
To increase reaction rate, we can increase concentration.
To increase reaction rate, we can __________ temperature.
To increase reaction rate, we can increase temperature.
Catalyst
A substance which speeds up (catalyses) a reaction without getting used up.
To increase reaction rate, we can __________ particle size.
To increase reaction rate, we can decrease particle size.
To increase reaction rate, we can add a __________.
To increase reaction rate, we can add a catalyst.
To increase reaction rate, we can increase ________ or ________.
To increase reaction rate, we can increase concentration or temperature.
To increase reaction rate, we can decrease ________.
To increase reaction rate, we can decrease particle size.
Name two ways to collect a gas.
Inverted measuring cylinder filled with water
Gas syringe
When is it not possible to use the method shown to collect a gas?
When the gas is soluble in water.
Sulfur dioxide gas is very soluble in water.
What method can you use to collect it?
Gas syringe
Which graph shows a faster reaction?
Steeper slope = higher reaction rate
Which graph shows an experiment where more product was made?
Taller graph = more product made
How will the shape of the graph change if the reaction is repeated at a higher temperature?
It will be steeper (higher rate).
How will the shape of the graph change if the reaction is repeated with a lower concentration acid?
Less steep AND less tall
(Lower rate and less product made)
Exothermic reaction
A reaction that gives out energy to the surroundings.
(Remember: energy exits the reaction.)
Endothermic reaction
A reaction that takes in energy from the surroundings.
How can you tell if a reaction is exothermic?
Measure temperature.
Temperature increases = exothermic reaction.
A reaction that takes in energy from the surroundings.
Endothermic reaction
A reaction that gives out energy to the surroundings.
Exothermic reaction
