Do the Mythbusters follow a scientific method ?
Name the variable that is deliberately changes in an experiment.
Independent Variable.
How are circuits in the home typically connected?
In parallel circuits.
Why is this chemical equation incorrect?
H2 O2 --> H2O
It is not balanced.
Exothermic
The type of data that line graphs are typically used for.
Continuous data
What is used to measure voltage in a circuit?
A voltmetre
How do you know a chemical reaction has taken place?
A new substance has been produced.
what type of chemical reaction is happening when you light a match?
combustion.
Name the 6 steps in the scientific method
Purpose, research, hypothesis, experiment, analysis and conclusion.
Teacher to mark.
What is the name of a reaction when a solid comes out of an aqueous solution?
Precipitation.
Identify the type of reaction
carbon monoxide gas + oxygen gas → carbon dioxide gas
What makes an experiment reliable.
When repeated results are repeated.
Explain why globes in a parallel circuit are brighter than the same amount of globes with same voltage supply in a series circuit.
In a series circuit the current voltage is shared between the lights each getting a portion of supplied voltage. In a parallel circuit the voltage is not split each getting theoretically the original voltage amount.
What is the name of a reaction of an acid and a base?
neutralisation
Explain how increasing the temperature can increase the rate of reaction in a chemical reaction
Increasing the temperature increases the kinetic energy of the particles, this increases the rate of collisions.
what is the electrical resistance in a circuit with 12 volts and a current of 3 amperes?
R = V/I
R= 12 V/3 A
R= 4 Ω
Use the Law of Conservation of Mass to explain why it is incorrect to say that when a candle burns it disappears.
Although a burning candle appears to disappear, the Law of Conservation of Mass indicates that it doesn’t disappear. The atoms in the wax have taken part in a chemical reaction and have changed into new products. Because the new products are gases and very light particles of ash, they spread out and seem to disappear.
Describe the purpose of a catalyst in a chemical reaction?
The purpose of a catalyst is to speed up a chemical reaction.