Chemistry Y9 Flashcards
How much is a mole?
6*10^23
What percent of air is Oxygen
21 percent
Magnesium + Oxygen
Magnesium oxide
Balance: _H(2)O(2)=_H(2)O + _O(2)
2, 2, 1
Balance: _CaCl(2) + _KOH = _Ca(OH)(2) + _KCl
1, 2, 1, 2
Sulfur dioxide is made when
We burn fossil fuels
Acid rain is when
Sulfur dioxide dissolves in water
Test for CO2
Put gas through lime water, it should turn milky
If the Products bar is lower than the reactants bar, it was a
Exothermic reaction
Exothermic reactions get hot or cold
Hot
What is a fuse
A fuse is a wire that will melt if too much current is passed through it, breaking the circuit
How much is a watt
1 joule per second
When you are hot, how do you cool down
Your hair lies flat, Blood vessels widen, sweat glands produce sweat
Types of energy stores
Chemical, Gravitational potential, Elastic potential, Nuclear, Thermal, Kinetic energy
Energy isn’t lost or gained, it is
transferred
A ball shot into the sky turns kinetic energy into…
Gravitational potential
What is the UK mains supply in volts?
230 V
What frequency is the mains
50 hz
How do power stations work
They burn coal to heat steam to turn a turbine.
What does a step up transformer do
Increases the voltage
What is a high voltage
The pressure pushing the current
Why is high voltage more efficient
Because it loses less energy
Kinetic energy =
1/2 mass * velocity^2
If the two alleles are the same, it is called…
Homozygous
If the two alleles are different, it is called…
Heterozygous
What are four things humans have selectively bred
Racehorses, farm animals, crops, dogs, flowers
