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Of all the mediums in which light travels the fastest
Air
What is refraction?And why it happens
bending of light, Change in direction due to change in speed when entering a different medium
Why does a red rose appear red
All the colours are absorbed except red which reflects back to our eyes
Red + Green
yellow
What are the primary colours of light?
Red, Green and Blue
State the law of reflection
Angle of incidence = Angle of reflection
Where will you connect ammeter and a voltmeter in circuit
Ammeter- Series, Voltmeter- Parallel
Difference between resistor and a variable resistor
Variable- you can control the resistance
State ohms law
V = IR
Advantages of parallel circuit
Each component can work independently
higher the temperature higher the rate of reaction. Justify
More temperature, more kinetic energy, more collision and more reaction
One evidence that supports the collision theory for the formation of the moon
Moon is less dense than earth, Samples of rock from the moon show that its surface was once molten
Draw 2 sound waves must meet in order to cancel out each other
destructive
Draw 2 how 2 sound waves must meet in order to reinforce
constructive
What is law of conservation of mass
Mass of the reactants will always be equal to the mass of the product
Why would it be dangerous to prepare sodium chloride by reacting sodium with Hcl
Both are highly reactive
what is similar about the formula for Hcl and sodium chloride?
Chlorine
Which element are present in sulphuric acid? How many atoms of each atoms make up one particle of sulfuric acid?
7 atoms
Name of acid- Nitric Acid, what will be the name of salt formed by this.
Salt Nitrate
Can iron displace aluminium from aluminium oxide? Explain your answer
No, Iron is least reactive that aluminium
Can silver displace the magnesium in magnesium sulphate?
No
Can zinc displace the copper in copper sulphate?
Yes
What is the word equation for the reaction between zinc and sulphuric acid
Zinc sulphate + hydrogen
Platinum is a precious metal that is used for jewellery. Where in the list would you place platinum?
Least reactive
The metal lithium is missing from the reactivity list, suggest where it should be placed
Most reactive
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