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Key Stage 3 Science

QuestionAnswer
State the names of the 3 states of matter along with their relative force of attraction of their particles, particle motion and particle arrangement
What is the definition, equation and units of densit Density is the mass of a certain volume of a material. the equation for density is density = mass/volume , with units g/cm3 or kg/m3
Describe an experiment to find the density of a metal cube Measure the mass of the cube using a balance.Then measure the length of the cube using a ruler. Find the volume of the cube by multiplying length x length x length. Then use the formula density = mass/volume to find the density of the metal cube
What are the 6 changes of states and their names Solid to liquid is melting, liquid to gas is evaporation, solid to gas is sublimation, gas to solid is deposition, liquid to solid is freezing and gas to liquid is condensation
How is pressure obtained in a fluid and explain 3 ways of increasing this pressure
The mass of a piece of compressed plastic cuboid is 48g. Its length is 8cm, its width is 4cm and its height is 2cm. Will this cuboid float in water? Show all working. Volume of cuboid = l x w x h = 8cm x 4cm x 2cm = 64 cm3 Density of the compressed plastic = mass/volume = 48/64 = 0.75g/cm3 The density of the plastic is 0.75g/cm3 , which is less than the density of water which is 1.00g/cm3. The plastic will float
State the name of 2 drag forces in a fluid and state one way of increased and one way of decreasing drag forces Drag forces in fluids are air resistance and water resistance. We can increase drag forces by increasing the surface area of the object. We can reduce drag forces by making an object more streamlined shape
Describe balanced forces and how an object can achieve balanced forces in a fluid. State the name of the special speed
What are the 2 main things that distinguish a chemical change from a physical change and state 2 examples of each
Describe an experiment to find the density of an irregular shaped object
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