7S,7I,7G Science Revision Flashcards
7S-What is a hazard?
Something that can cause harm within a lab.
7S-What is a risk?
Something dangerous that could happen because of a hazard.
7S-What are some common control measures?
Wear goggles, wear gloves, tie your hair back, keep objects in the centre of the table.
7S-What is a quantity?
Something that can be measured.
7S-What equipment do you use to measure length,liquid volume and mass?
Length-Ruler
Liquid volume- Measuring cylinder
Mass- Scale/Balance
7S-What should you do to make sure you measure the right amount?
Read your value with the equipment at eye level.
7S-What’s the difference between safety and roaring flame?
A safety flame is orange and a roaring flame is a loud blue flame. A safety flame is cooler than a roaring flame.
7S-What piece of equipment do we use to heat a substance?
A Bunsen burner.
7S-How do you measure the temperature of a substance?
Using a thermometer.
7S-What is the independent variable?
The variable that you change in an experiment.
7S-What is the dependent variable?
The variable that you measure in an experiment.
7S-What is the control variable?
The variable that you keep the same in an experiment.
7S-What is an anomaly?
A result that doesn’t fit the pattern in your experimental results.
7S-How do you calculate the mean?
Add up the values and divide this number by the number of values you added.
7S-What should a good graph include?
Labelled axis, points plotted as crosses, a title and everything is drawn in a pencil and a ruler.
7I-What is an energy store?
A way in which energy can be kept in a system.
7I-What are the six types of energy store?
Nuclear,gravitational,elastic,chemical,kinetic,thermal.
7I-How can we increase the energy in a kinetic,gravitational or chemical store?
Kinetic-move faster
Gravitational-lift the object higher
Chemical-eat food.
7I-What is an energy transfer?
A way of moving energy from one store to another.
7I-What are the five types of energy transfer?
Light,heat,forces,sound,electricity.
7I-What is energy measure in?
Joules (J)
7I-What is meant by the conversation of energy?
That energy cannot be created or destroyed, only transferred from one store to another.
7I-How can we find out how much energy is in our food?
In the energy section of the nutrition label on the food wrapper.
7I-What happens if we consume too much or too little energy in our diet?
If we consume too much,we gain weight.
If we consume too little, we lose weight.
7I-How do I use a bunsen burner safely?
Tie hair up,tuck in ties,keep on a safety flame when not in use.
7I-What is a fuel?
A fuel is a store of chemical energy.
7I-How are oil,coal and natural gas formed?
They are formed by dead animals or plants that have fossilised after being under intense pressure and heat for millions of years.
7I-What do we mean when we say a fuel is non-renewable?
That the fuel will eventually run out.
7I-What are biofuels and why are they renewable?
Biofuel are fuels that are made from plant or animal waste.They are renewable as the supplies of them never run out.
7I-What do we mean by the term renewable?
Renewable energy resources are sources of energy that never run out.
7I-What are the advantages of renewable energy sources?
That they never run out and they do not add to global warming.
7I-What are the disadvantages of renewable energy?
They usually depend on the weather to work (wind and solar) or they are expensive to build (hydroelectric).
7G-What is a physical substance?
Something which has both mass and a volume.
7G-What is meant by mass and volume?
Mass is how heavy something is.
Volume is how much space something takes up.
7G-What is meant by states of matter?
A state of matter is the form of a substance that can exist as either a solid,a liquid or a gas.
7G-What are the properties of solids?
Solids have a fixed volume and shape.
7G-What are the properties of liquids?
Liquids have a fixed volume, but no fixed shape. They can fow and take the shape of their containers.
7G-What are the properties of gases?
Gases have no fixed shape and volume and they can be compressed into a smaller volume.
7G-What is particle theory?
All matter is made up of particles. Particles experience forces of attraction keeping them together.
7G-What are the forces of attraction like in a strong?
Strong
7G-What are the forces of attraction like in a liquid?
Medium
7G-What are the forces of attraction like in a gas?
Weak
7G-What is a state change?
When a substance changes from one state to another.
7G-What are the four types of state changes?
Melting, freezing, boiling, condensing.
7G-What is a melting point?
The temperature at which a solid becomes a liquid.
7G-What is a boiling point?
The temperature at which a liquid becomes a gas.
7G-What observations did Robert Brown make?
Brown noticed that particles of pollen moved around randomly when placed in water.
7G-What is Brownian motion?
The random motion of particles when suspended in a liquid or gas.
7G-What is diffusion?
Diffusion is the ‘spreading out’ of particles in liquids and gases.
7G-What states of matter can diffuse?
Liquid and gas particles.
7G-What is meant by a high and low concentration?
Low concentration-area where there are a fewer number of particles.
High concentration-area where there are plenty of particles close together.
