RP - 11.4 Temperature Changes Flashcards
Required Practical
What is the method of the practical temperature change
1) Using a measuring cylinder measure 30cm^3 of dilute hydrochloric acid and transfer it into a polystyrene cup
2) Put the cup into a beaker to prevent it from falling over and add a thermometer to measure the temperature of the acid and record your results
3) Using a measuring cylinder measure 5cm^3 of sodium hydroxide solution and pour this into the polystyrene cup
4) put a lid on the cup and record the increase in temperature
5) repeat the experiment again using other substances
what equipment could we use thats more accurate in the required practical temperature change
pipette
digital thermometer
what acts as an insulator in the RP temperature change
cup and lid
Why do we use a cup and lid in the RP temperature change
to use it as an insulator to prevent heat from escaping
in the RP temperature change what temperature is reached
the maximum temperature
what will increase the temperature of hydrochloric acid in the RP temperature change
sodium hydroxide
what 2 chemicals do we use in the RP temperature change
sodium hydroxide
hydrochloric acid
what does a neutralisation graph look like
point go up in straight line and then fall in straight line
in the RP temperature change is the reaction endothermic or exothermic
exothermic
in an exothermic reaction where does energy move to
energy is released from the surroundings
what is the calculation when you react an acid with an alkaline
acid + alkali (base) –> water + salt
what is the independent variable in the RP temperature change
volume of sodium hydroxide solution
what is the dependent variable in the RP temperature change
maximum temperature reached
what is the control variable in the RP temperature change
- volume of hydrochloric acid
- concentration of both substances
what equipment is used in a temperature change practical
lid
polystyrene cup
thermometer
measuring cylinder
