Science Yr 7 Mixed Questions

This is made for a year 7 science test

Hazard

Something that could cause harm inside a lab.

Risk

Something dangerous that could happen because of a hazard.

Common Control measures

Wear googles , tie your hair back if you have long hair , keep objects in the middle of the table .

Quantity

Something that can be measured

What equipment do you use to measure length?

-Measuring cylinder

-Ruler

-Balance ( A weighing device)

Ruler

What equipment do you use to measure Liquid Volume?

-Measuring cylinder

-Ruler

-Balance ( A weighing device)

Measuring cylinder

What do you use to measure mass?

-Measuring cylinder

-Ruler

-Balance ( A weighing device)

Balance

What should you do to make sure you measure the right amount?

hint : ___ level

Read your value with the equipment at eye level

What piece of equipment should you use to heat up a substance?

A bunsen burner

What colour is the safety flame?

Orange

What colour is the roaring flame?

Blue

What do you use to measure the temperature of a substance?

A thermometer

What is the independent variable?

The thing you can change in an experiment

What is the dependent variable?

The thing you can measure in an experiment

What is a control variable?

The thing that you keep the same in the experiment

Anomaly

A result that dosen’t fit with the pattern in your experiment

How do you calculate a mean?

You add up the values and divided the number by the number of values you have added.

A Mean

An average of the numbers

What should a good graph have?

Labelled axis , points plotted as crosses, a title and everything is drawn in pencil with a ruler

Why are there rules in a science lab?

The room has lots of hazards which can cause injuries and trouble for the teacher to deal with.

Physical substance

Something that has both mass and volume

Mass

How heavy a substance is

Volume

How much space a physical substance occupies

States of matter

The form a substance can exist as either a solid , liquid or gas

Properties of solids

Fixed volume , Fixed shape cannot be compressed into a smaller volume

Properties of Liquids

Fixed volume , no fixed shape and can flow and take the shape of a container but cannot be compressed into a smaller volume

Properties of Gases

No fixed shapes , no fixed volume and can be compressed into a smaller volume

Particle

Smallest building block of any substance

Particle theory

All matter is made up of particles . all particles can move. Particles experiences forces of attraction where the strength of the attraction depends on the state of matter.

Properties of solids in term of their particles

Tightly packed together, held in a fixed position , strong force of attraction ,

Properties of liquids in terms of their particles

Held fairly close together , particles can move past each other fairly strong forces of attraction

Properties of gases in terms of their particles

Free to move in random directions , particles spread far apart , weak forces of attraction

State Change

When a substance changes from one form to another

What type of process is a state change?

Physical processes

What causes a state change?

Particles rearrange when they gain or lose energy from heating

Six types of state changes

Melting , freezing , boiling , condensing , sublimation , deposition

Melting point

The temperature at which a solid becomes a liquid

Boiling point

The temperature which a liquid becomes a gas

Temperature scale

A scale that represents the melting and boiling points of different substances

What observation did Robert Brown make?

He noticed that the pollen moved when he put it in water

Brownian motion

The random motion of particles when suspended in a liquid or gas

Diffusion

Spreading out of the particles in liquids and gases

High concentration

An area where there are plenty of particles close together

Low concentration

An area where there a fewer numbers of particles

How do particles move during diffusion?

Particles will move from an area of high concentration to an area of low concentration

Energy store

A way in which energy can be stored in a system

Six types of energy store

Nuclear , gravitational , elastic , chemical , kinetic , thermal

How can you increase the energy in a kinetic , gravitational or chemical store?

Please answer like this

Kinetic - _________

Gravitational -_________

Chemical-_______

Kinetic- move faster

Gravitational - lift the object higher

Chemical - eat food

Energy Transfer

A way of moving energy from one store to another

Five types of energy transfer

Light, heat , forces , sound , eletricity

Conversation of energy

That energy cannot be created or destroyed only transferred from one store to another

What is energy measured in?

Joules

What happens if you consume too much or less energy?

Gain weight , lose weight

Fuel

A store of chemical energy

Non- renewable

The thing will eventually run out

How can you tell if a force is acting?

You will see a change in speed ,shape or direction of an object

How does a contact force affect an object?

By touching it

How does a non -contact force affect an object?

Without touching it

Non- contact forces

Weight , Static electic , magnetic

Contact forces

Normal contact force , Friction , Drag , Upthrust ,tension , thrust

How do represent forces on a diagram?

With an arrow

How do you represent the direction of the force on a diagram?

By the direction of the arrow

How do represent the size of the force on a diagram?

By the length of the arrow

What unit do you use to measure force?

Newton

What do you use to measure forces?

A newton meter

What is the approximate force required to hold an apple?

1 newton

What do you call friction between an object and a liquid or a gas?

Drag

What direction does friction and drag act on a object moving forward?

Backwards

What effect does friction and drag act on a object moving forward?

It slows the object down

What happens if you apply a pull force on a spring?

It stretches

What happens if you apply a push force on a spring?

It compresses

Why do people say that springs are elastic?

Because they return to their original shape

What does Hooke’s Law state?

That if you double the force on a spring you double the extension.

Atom

The smallest building block of a physical substance

How many atoms are there?

118