Fechar
Energy cannot be created or ________. It can only be ___________ from one form to another. (law of conservation of energy)
Where does a kettle get its energy from? What is the useful energy from a kettle?
Current and Voltage is measured in ......
What are the advantages of using a parallel circuit instead of a series circuit?
What is a fuse and what how does it work?
Which of the following three fruits generates the most electricity naturally and why?
Potato
Lemon
Orange
State 4 properties of metals.
State 3 uses of metals
The squeaky pop test is a test for what gas?
What is needed for rusting to take place?
The process of rusting is called oxidation while the chemical name for rusting is __________ ________
State the 3 ways in which rusting can be prevented.
Metal + Acid = ________ + __________
Sodium + sulfuric acid = ___ + ___
State the reactivity series from potassium to gold.
Copper compounds are _____
Iron salts are pale green or _____
Aluminium salts are white or colorless while calcium salts are _____
Do most metal carbonates dissolve in water?
Metal carbonate + acid = _______ + _______ + ________
Define bases.
Copper oxide + HCL =
Copper hydroxide + HCL =
Copper carbonate + HCL =
In what substance are Nitrogen, Potassium and Phosphate in?
How can you make large copper sulfate crystals?
Which salt is formed from the reaction of calcium with nitric acid?
Which gas is formed when a metal carbonate reacts with acid?
What is the most reactive metal in the group one metals in the periodic table?
What is this test for?
"Put a burning splint into a tube of the gas ( the gas will explode with a squeaky pop)
Which of these is NOT a sign that a reaction has taken place?
a. the substance catches fire
b. the substance has changed from a solid to a liquid
c. A gas is given off
d. There is an explosion
In an experiment involving metals and its conduction of electricity which metals would have the greatest voltage?
a. copper & copper
b. zinc & copper
c. zinc & zinc
What would you get if copper sulfate and magnesium were reacted together (displacement reaction) and explain?
Iron sulfate + copper =
Define exothermic and endothermic reactions.
What is more reactive, copper or gold?
Complete combustion of carbon is when carbon is burnt in an excess supply of oxygen producing carbon dioxide and more energy. What is incomplete combustion of carbon?
If I burn a metal in air will its mass change? If so will it decrease or increase?
What is combustion?
What needs to happen for this reaction to take place?
Aluminium + iron oxide = Aluminium oxide + iron
When magnesium is burnt, what happens?
What sort of reaction is this?
Potassium + oxygen = Potassium oxide
Iron is unreactive in ________ and ________ but reacts in _______
Distance is = ?
Speed is = ?
Time is = ?
How long would it take a person to walk 10km if their average speed is 5.4km/h?
A car is travelling at a constant speed. Compare the forward and the backward forces.
Give a more scientific term for increasing speed and decreasing speed.
What is the formula for acceleration/deceleration (also include the words final and initial speed/time)?
A person first travels for 4 seconds, steadily increasing their speed to 6 m/s from 0 m/s. Then they maintain a constant speed for the next 6 seconds. After they steadily decrease their speed to rest in the last 4 seconds. Calculate the deceleration and acceleration rate (show working).
When there is a balanced force from the left and the right of an object, the object is either at _____ or maintains a _________ speed.
A bicyclist streamlines her body. Why?
A man on a parachute lands safely. Why?
Air resistance depends on the size, the _____ and the _____.
Who discovered force? (Newtons)
The Normal force (force applied at 90 degrees) per unit area is the definition of what term?
Pressure = ?
Force = ?
Area = ?
Pascal is = ?
Weight, a force, = ?
10m/s squared is = what force?
The ________ surface area the higher the pressure.
Max pressure = Force/min Area
Min pressure = Force/max Area
Why do knives have a sharp edge?
Why does a balloon expand (force)?
The ________ the altitude the ________ the atmospheric pressure.
Why do tractors have large tyres?
Does pressure in liquids increase or decrease with depth?
When I put a beaker on a strip of water nothing really happens but when I put a burning paper in the beaker then put it on a strip of water, the water outside of the beaker pushes the water inside the beaker. Why?
Define a moment
The larger the perpendicular distance form the pivot point and the bigger the force the ______ the turning point.
Moment of a force = ?
Unit for moment = ?
A large force * a small distance = a ________ force * a _________ distance
The force is 2N
The perpendicular distance is 0.4m.
What is the moment?
Clockwise moment = _________ moment
Balanced or not moving object
The larger the perpendicular distance from the pivot, the _____ force needed.
Why should you grip the handle bars of a bicycle at the ends?
Where is the center of gravity for uniform objects like a meter ruler?
What should I do if I want to stabilize an object? State the two factors.
How can an object be in an unstable equilibrium?
Pressure in _________ = depth * density * gravity
When a car passes by, a person was pushed slightly towards the car. Why?
What does hydraulic fluid do?
