WorksheetsChemistry
Total questions: 28
Worksheet time: 15mins
The word ‘plastic’ comes from the Greek plastikos, meaning ‘capable of being shaped and moulded.
True
False
Which of the following materials is non-biodegradable?
plant waste
paper
plastic
yard waste
Where does plastic go when we throw it in the bin?
Land dump
The Ocean
Recycling Factory
All of the above
How much time does it take for a plastic bottle to decompose?
around 450 years
around 50 years
around 200 years
around 5 years
Why is plastic dangerous for animals?
They can be trapped in plastic things.
They can choke (zakrztusić się) with small plastic pieces and die.
They can eat plastic which fills their stomaches and they die of starvation because they don't feel hungry.
Plastic is not so dangerous for animals.
Why recycling can't win with plastic pollution?
Because recycling is wrong
Because people produce too much plastic to recycle it all.
Because not every plastic can be recycled.
Because not many people recycle rubbish.
How can we help to reduce plastic pollution?
We should use paper/cloth bags.
We should use less plastic.
We should refill our drinking bottles not buy new ones.
We should avoid (unikać) plastic or styrofoam containers.
All answers are correct.
Burning wood
physical change
chemical change
How do you know that rusting is a chemical change?
it changes color
atoms were rearranged to form a new substance
we just know
the rust
What property of metals does the term conductivity describe? (HINT: Think back to 6th grade.)
reactivity with other elements
melting & freezing point
ability to transfer heat and electrcity
density
Elements are called the building blocks of matter because.....
they are pure substances
they are often used to build things
all matter is made up of one or more elements
elements have mass & volume
The formula for calcium chloride is CaCl2. Which is the best response that explains what the formula means?
chlorine is 2 times stronger than calcium
two chlorine atoms are bonded to one calcium atom
calcium and chloride have 2 covalent bonds
chlorine is unstable until it bonds with 2 more calcium
Fe(NO3)2
The Law of Conservation of Mass States
Energy cannot be created nor destroyed, it can only change form.
Mass cannot be created nor destroyed, it can only change form.
Mass can be created or destroyed, it cannot change form.
According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?
The wood disappears.
It stays the same chemically.
The atoms in the wood and oxygen rearrange and form smoke and ash.
Nothing.
