Temperature Essay Examples

Temperature Vs Rate of Reaction

Research Question: Does temperature affect the rate of reaction between two substances? Dependant Variable: Rate of Reaction of solution Independent Variable: Temperature of Reactants Controlled Variables Both reactants must have the same temperature the same amount of both reactants must be used for each trial The same calorimeter must be used throughout the experiment the… View Article

A piece of wire

Using this graph, we can predict the resistance of any length up to 100cm. To test if these results are accurate, we can compare the experiment we have performed, with those of previous resistance experiments. The book value, in ohms, for the resistance of a 100cm length of 28swg wire is 4. 4?. This convinces… View Article

To determine the enthalpy of reaction

To determine the enthalpy of reaction Introduction The enthalpy change of reaction is the enthalpy change when amount of reactants react together under standard conditions to give products in their standard states. The heat change might be exothermic or endothermic. Exothermic reactions: Heat flows from the system to the surroundings. The value will be negative…. View Article

The kinetic theory

In this investigation, I will be studying the factors that affect the rate of reaction. In this case, the reaction between hydrochloric acid and sodium thiosulphate. Na2S2O3 (aq)+ 2HCl(aq) 2NaCl(aq)+S(s)+SO2(g) When hydrochloric acid is added to sodium thiosulphate, the chemicals react giving solid sulphur as one of the products. This is a precipitation reaction. By… View Article

The function of catecholase

5 mL of enzyme, and all of the trials were set up as two tubes to begin with. One tube had 3. 5 mL of water and 2. 0 mL of catechol, and the other had . 5 mL of enzyme. By keeping the enzyme and substrate separate, we were able to have more control… View Article

The disappearing cross

In this experiment, we shall be adding sodium thiosulphate to hydrochloric acid together and placing a drawn cross underneath and seeing how long the rate of reaction lasts until you cannot see this cross. Before the reaction starts, the liquids are both clear. When added they turn cloudy and milky with a yellow tinge to… View Article

The resistance of a length of wire

However, once the power supply is switched on, the free electrons are pulled through the circuit towards the positive terminal, and pushed away from the negative terminal, therefore creating the net flow of electrons. This ensures that there is always the same amount of electrons in the conductor, in this case constantan, at any given… View Article

The rate of lipid digestion by lipase

I have also calculated that 60 C is narrowly above the maximum temperature the enzymes could handle. EVALUATING EVIDENCE. In my opinion I think my own-recorded results are exceedingly accurate and reliable. The reason I think I have reliable results is because I did the experiment three times over for each different temperature and then… View Article

The filament bulb obeys ohms law

I think this was caused by air already in the tube being pushed out. To overcome this I could have measured how much O2 started in the tube and then subtracted that from my 1st measurement. My experiment was good because it was repeated enough times, three times, so that any anomalous results could be… View Article

The action of enzymes

Enzymes are proteins that are chemicals that dissolve and break down food. They help speed up the rate of which food can be digested in our bodies. Without enzymes food will take forever to digest, but as they are highly specific catalysts that mean that they can break larger molecules faster then if they were… View Article

The change of resistance of a metal

The power I supply to the circuit will be very important. There must be enough current to measure but not too much which would cause the wire to generate a significant amount of heat, which would affect the result. The current must also remain fairly constant throughout the experiment so any affect it has on… View Article

Sodium thiosulphate Investigation

Concentration of Na S O Apparatus:  1 x stopwatch to time the reaction to the nearest second so that the results are as accurate as possible, using analogue clock would be inaccurate because it would not stop.  1 x 100cm beaker for using in the reaction, because using a smaller beaker would not fit the… View Article

The length and resistance

The aim of this investigation is to find out how changing the length of a piece of wire will affect its resistance. Prediction I think that increasing the length of a wire will increase its resistance. This is because in a conductive metal, the electrons in the outer shell of each atom are free to… View Article

Resistance of a wire

Preliminary Results- Length (cm) Current (A) Voltage (V) Resistance (?) 1Length (cm) Average Current (A) Average Voltage (V) Average Resistance (? ) Apparatus:  100 cm of constantan wire  Voltmeter  Ammeter  Crocodile clips Leads  Power pack  Meter rule Diagram: Method: 1. I will measure out 100 cm of the constantan wire 2. I will set up… View Article

Rates of reaction – molarity

Chemistry Coursework – Rates of Reaction – Molarity (Concentration) Aim: to find out if the concentration of HCl affects the amount of hydrogen gas given off when a magnesium strip is added. Apparatus: Gas syringe – to take all the gas from the reaction and measure it Test tube – to hold the two reactants… View Article