Year 9 Science Term 1 - Recap and Quiz

Term 1 - Recap and Quiz

By Kate [e-mail]

Multiple Choice

What is the BEST definition of an OBSERVATION in Science?

• Something we can see

• An idea we have based on our senses,

• The use of any or all of our five senses to gather information

• An explanation of something we see or hear

Multiple Choice

What is the BEST definition of an INFERENCE in Science?

• A prediction of what might happen in the future based on what we observe

• A possible explanation of what has happened based on what we observe

• Facts about what we see or hear

• Something someone tells us is true

Multiple Choice

Which of the following is NOT an observation?

• People must have thrown bottles into the river

• There are bottles in the river

• The water in the river is brown

• There are houses and factory buildings next to the river

Open Ended

Write ONE observation about this picture.

Open Ended

Write ONE inference that is linked to your observation in the previous question.

(You will write a second inference in the next question)

Open Ended

Write a second inference about this picture that is also linked to your observation.

Open Ended

I want to heat a small amount of liquid safely in a laboratory. List ALL the peices of lab equipment I would need to use.

(Don't include anything that I wouldn't need to use)

Multiple Choice

What is the best definition of "matter"?

• Anything that makes a sound and takes up space

• Anything that has weight and gives off light

• Anything that takes up space and has weight

• Anything that makes a sound and gives off light

Multiple Choice

What is matter made of?

• Thomas

• Atoms

• Stuff

• Nothing

​Atoms are made of protons, neutrons and electrons.

​

• Protons and neutrons are found in the nucleus, in the middle of the atom.

• Electrons are found around the outside of the nucleus. ​

Multiple Choice

What are the three things that make up all atoms?

• Protons, new towns and electrodes

• Prunes, neutrons and electricity

• Protons, neutrons and electrons

• Nucleus, Protons and Electrons

​Do you remember this diagram from your Science Book?

Mixtures are not pure because there is more than one substance . Mixtures are not chemically bonded together.

Elements and compounds are pure substances.​

​

​

Pure Substances​

Classifying Matter

Some text here about the topic of discussion

Matter can be classified as either PURE SUBSTANCES or MIXTURES

Mixtures​

Multiple Select

Select ALL of the pure substances.

• Elements

• Compounds

• Mixtures

Multiple Choice

Mixtures are not a type of matter.

• True

• False

An element is a pure substance made up of only one type of atom.

​​ELEMENTS​

​EVERY element is listed on the Periodic Table of Elements

Multiple Select

Select ALL of the true statements about elements.

• Elements are found on the periodic table

• An element is made up of one type of atom

• Elements can be either metals or non-metals

• All element symbols have a capital letter

• Some element symbols have a capital and a lower case letter

Multiple Choice

The three diagrams all show examples of ELEMENTS

• True

• False

A compound is a pure substance made up of two or more DIFFERENT elements chemically bonded together ​

COMPOUNDS​

For example: Water, H₂O, is a compound made up of 2 hydrogen atoms and 1 oxygen atom.

​

The two different types of atoms are all bonded together.

• All compounds have a chemical formula which shows us what they are made of.

• Some compounds also have a more common name that we know them by​.

Multiple Select

Identify ALL of the compounds from the pictures

Open Ended

The chemical symbol for water is H₂O. Water contains 2 hydrogen atoms and 1 oxygen atom.

The chemical symbol for sulfuric acid is H₂SO₄. What atoms make up sulfuric acid?

Open Ended

Carefully look at the diagram and identify all of the boxes that contain mixtures.

Multiple Select

Select ALL of the box(es) contain a mixture of elements?

• 2

• 5

• 7

• 8

• 9

Open Ended

After you have been swimming in the sea, your hair can sometimes feel crusty after it has dried.

Using your knowledge of separating mixtures, EXPLAIN IN DETAIL why this happens.

Physical Change

• During a physical change, no new substance is formed.  

• Signs of a physical change include:

  • A change of shape or size

  • A change of state (solid to liquid to gas, or vice versa)

  • An expected colour change (e.g. when you dissolve raro powder in water)

  Physical changes are normally easy to reverse. 

  (unless you have changed the shape/size of something by breaking it)

  ​

Chemical Change

During a chemical reaction, new substances are formed. Chemical bonds are broken and/or formed.

• ​Signs of a chemical change include:

  • An unexpected colour change

  • Bright light is seen

  • Heat being released (feels hot) or absorbed (feels cold), without actively heating or cooling the substance

  • Fizzing /Bubbles being formed (without heating the substance)

  • A new odour

• Chemical changes are very difficult to reverse. i.e. you can't change it back

Multiple Select

Identify which of these are CHEMICAL CHANGES

(There may be more than one)

• Breaking an egg

• Heating up the oven

• Baking a cake

• Using baking soda so the cake will rise

Multiple Select

Identify which of these are a PHYSICAL CHANGE

(There may be more than one)

• Burning wood in a camp fire

• Boiling water which then evaporates.

• Cooking mussels in the boiling water.

• The mussel shells opening when they are cooked.

Open Ended

The correct answer to the previous question is shown.

Carefully explain why the two selected boxes ARE physical changes AND why the other two ARE NOT physical changes.