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8I
Key Stage 3 Science
| Question | Answer |
|---|---|
| What is the name for when a liquid changes into a gas? | Evaporation. |
| What is density? | The amount of mass in one cubic centimetre of a substance. |
| Draw the particle structure of a solid. | Lots of circles close together. |
| Which one has the highest density: a solid, a liquid or a gas? | Solid |
| What happens to the density of a solid when it is heated? | It decreases as it expands. |
| Is a change of state a physical or chemical change? | Physical change |
| Name two things that can increase the density of a substance. | Decrease the volume, increase the mass. |
| On a temperature-time graph, how do you know when a change of state has occurred? | Where there is a flat, horizontal line / at a constant temperature. |
| What does “compress” mean? | To squeeze into a smaller volume of space. |
| What piece of equipment is used to measure the temperature? | Thermometer |
| Is ice more or less dense than water? | Less dense |
| How do you find the volume of an irregular shape? | Fill up a eureka can with water and then place the object inside – the volume of water than comes out of the can is equal to the volume of the object. |
| Name two things that can decrease the density of a substance. | Decrease the mass, increase the volume. |
| Which has the smallest density: a solid, liquid or a gas? | Gas |
| What causes pressure in a fluid? | When the particles of eh fluid hit the side of the container that they are in. |
| What is the formula for calculating the density of an object? | Density = mass / volume |
| Give two examples of a resistive force. | Any two from :Water resistance, air resistance, friction. |
| What happens to the density of an object when it is compressed? | Increases. |
| How do you calculate the upthrust acting on an object? | Weight in air – apparent weight in water. |
| If an object floats, is it’s density more than, less than or equal to water’s density? | Less than. |
| Name two ways that a drag force can be increased: | Any two from: Increasing the frontal surface area, moving faster, not being streamlined. |
| What piece of equipment is used to find the weight of an object? | Newton meter. |
| Which TWO states of matter are fluids? | Liquid and Gas. |
| Name two things that can increase the pressure created by a fluid. | Any two from: Increasing the number of particles, increasing the temperature, decreasing the volume. |
| Define "pressure" | The force exerted over an area |
| State the two ways that pressure on a surface can be increased | 1. Increase the force 2. decrease the area |
| State the equation used to calculate pressure | P=F/A, Pressure=Force/Area |
| State the units of pressure | N/m2 or Pascals |
| State the reason that pressure in a fluid increases with depth | Increased weight of fluid above |
| Define "fluid" | Liquid or gas |
| Define "upthrust" | The upward force that a liquid or gas exerts on a body floating in it |
| Define "atmospheric pressure" | The pressure caused by the weight of the air above a surface |
| State the cause of pressure in a fluid | Particles hitting the surface of the container |
| State why an object floats | If the upthrust balances the weight |
| Name the 3 states of matter | solid, liquid, gas |
| Describe motion of particles in a solid, liquid and gas | S = Vibrating, L = Sliding, G = quick & random |
| What is the name for a solid turning into a liquid? | Melting |
| What is the name for the change of state when a liquid changes to a gas? | Evaporation |
| In which state do the particles have strong bonds between them? | Solid |
| In which state do the particles have no bonds between them? | Gas |
| How do the particles move in a solid? | Vibrate |
| How do the particles move in a liquid? | Slide over each other |
| How do the particles move in a gas? | Quick and random |
| In which state gas diffusion NOT happen? | Solid |
| In which state can particles NOT be compressed? | Solid and Liquid |
| In which state do particles stay in a fixed position? | Solid |
| What is the boiling point of water? | 100⁰C |
| What is the melting point of water? | 0⁰C |
| What is the name for a liquid turning into a gas? | Boiling |
| What is the name for a gas turning into a liquid? | Condensation |
| What is the name for a liquid turning into a solid? | Freezing |
| What is the name for a gas turning into a solid? | Sublimation |
| What is the name given to the process of a liquid turning into a gas at the surface of the liquid? | Evaporation |
| Define "boiling point" | The temperature at which a liquid turns into a gas |
| Define "diffusion" | The movement of particles from a high concentration to a low concentration |
| Give the properties of solids | particles arranged in a fixed position, vibrate in a fixed position, particles very close, cannot flow |
| Give the properties of iquids | particles randomly arranged, move around each other, close, can flow |
| Give the properties of gases | particles randomly arranged, move quickly in all directions, far apart, can flow |
| Define "density" | A measure of compactness and ratio of mass to volume |
| How much mass a substance contains compared to it's volume is… | density |
| State the equation which links density, mass and volume | ρ=m/v |
| State the units of density | kg/m3 |
| What two things are needed to determine density | mass of sample, volume of sample |
| How can you determine the volume of a solid? | regular solid = measuring side and calculating volume (l x w x h); using a eureka can and measuring the volume of displaced water |
Created by:
Davenant Foundation School
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