Density and changes of state 0.0 / 5 ? PhysicsModel of matterGCSEAQA Created by: Cat91Created on: 17-06-18 19:34 Which is heavier, a tonne of bricks or a tonne of feathers? Both the same. 1 of 35 Which is heavier, a kilogram of bricks or a kilogram of feathers? Bricks. 2 of 35 If two objects have the same volume do they also have the same mass? No. 3 of 35 Why does the same volume of something not mean the same mass? Because of density being different. 4 of 35 What does density tell us? How much mass there is in a certain volume. 5 of 35 Density = Mass/volume 6 of 35 P = M/V 7 of 35 What is density measured in? Kilograms per metre (kg/m cubed) 8 of 35 What is mass measured in? Kilograms (kg) 9 of 35 What is volume measured in? Metres (m cubed) 10 of 35 Can the density of an object be changed? No. 11 of 35 What can we use to compare the density of two materials? A balance. 12 of 35 What must we calculate before we can work out the density? Mass and volume. 13 of 35 How can we measure mass? By using an electronic balance. 14 of 35 How can we calculate the volume of regular shapes? Just use the mathematic formula for it. 15 of 35 How can we measure the volume of irregular objects? Using a displacement can. 16 of 35 Water displaced = Final volume - starting volume. 17 of 35 What can density be measured for? Any material. 18 of 35 What causes different densities? The arrangement and mass of the particles that make them. 19 of 35 What's a fancy word for heavy. Dense. 20 of 35 What is the general trend for density on the periodic table? It usually increases going down, but not always. 21 of 35 What sort of an arrangement are solids in? A regular one. 22 of 35 How do the particles in a solid move? They vibrate. 23 of 35 Name two things that having a regular shape means. They keep their shape and they can't be compressed. 24 of 35 How do liquids move? They're close together and touch each other n=but move around randomly. 25 of 35 Name three things about a liquid. They take the shape of their container. They can be poured. They can't be compressed. 26 of 35 How do gases move? Quickly and freely. 27 of 35 Name two things about gases. They spread out to fill a container. They can be compressed. 28 of 35 Which is densest, solids liquids or gases? Solids. 29 of 35 What is the exception to the 'solids are the most dense' rule? Water, because ice has particles that are further apart than water does. 30 of 35 What needs to happen to let an object change state? It needs to be heated or cooled. 31 of 35 When a substance changes state, what doesn't change? The amount of particles, therefore the mass. 32 of 35 What sort of reaction is a change of state? Physical. 33 of 35 If a reaction is physical, what does it mean? That it's reversible. 34 of 35 If a reaction is a chemical one, what does it mean? That it's irreversible. 35 of 35
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