Temperature Changes
This practical lesson covers:
- The variables that affect the temperature change in chemical reactions
Investigating temperature changes during chemical reactions
Aim
The aim of this practical is to investigate the variables that affect the temperature change in chemical reactions.
Background information
When an acid reacts with an alkali, a neutralisation reaction occurs. These reactions are exothermic, meaning they release heat energy to the surroundings, causing an increase in temperature. In this practical, you will add different quantities of sodium hydroxide to hydrochloric acid and measure the temperature changes that occur, demonstrating the exothermic nature of neutralisation reactions.
What is the purpose of this practical?
to determine the atomic number of carbon
to measure the volume of dilute hydrochloric acid
to investigate the variables that affect the temperature change in chemical reactions
to calculate the molar mass of sodium hydroxide
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What is the purpose of adding sodium hydroxide solution?
to decrease the temperature of the acid
to neutralise the acid
to increase the temperature of the acid
to measure the pH of the acid
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What is the purpose of placing the cup inside the beaker?
to prevent the cup from tipping over
to measure the volume of the acid
to increase the temperature of the acid
to create a closed system
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What is the role of the thermometer in this practical?
To determine the atomic number of sodium
To measure the volume of the acid
To neutralise the acid
To observe the temperature change
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What is the purpose of the polystyrene cup and lid?
to prevent heat loss to the surroundings
to increase the temperature of the acid
to decrease the temperature of the acid
to measure the pH of the acid
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