Mixtures and Substances
When you mix salt into water and it disappears so you can't see the individual parts, you’ve created this type of "homogeneous" mixture.
Solution
These are the basic substances we find in nature before we turn them into products.
Raw materials
This is the main source of energy for our planet and it never runs out.
The sun
Which of the following is a RENEWABLE energy source that will never run out: Uranium, Natural Gas, Biomass, Coal
biomass
This chemical reaction happens when oxygen meets a fuel (like wood) and produces heat and light.
Combustion (fire)
If we add sand to a beaker of water, what type of mixture will we get?
Heterogeneous mixture
If your shirt is made of cotton or your desk is made of wood, your materials have this "green" origin.
Vegetable origin
When you turn on a fan, electrical energy is transformed into this type of "moving" energy.
Mechanical energy
What happens when light hits a transparent medium like water and appears to "bend" the image of an object?
Refraction
All of these are properties of matter, EXCEPT: mass, density, size, volume
Size
Air is basically a mixture of oxygen and nitrogen. What type of mixture is air?
Homogeneous mixture
We use plastic to cover electrical wires because plastic is a/an ________________ meaning it does NOT allow electricity to pass through.
Insulator
This type of energy is stored in the food we eat and the batteries in our remote controls.
Chemical energy
Deep inside the Earth, it is incredibly hot. When we use the steam or hot water from underground to generate electricity, what type of energy are we using?
Geothermal
This is what happens when oxygen reacts with iron to turn it red and flaky.
Rust (Corrosion)
If you have a mixture of iron filings and sand, you don't need your hands to separate them—you just need this tool!
A magnet
This material is famous for being transparent so we can see through it, but it's also strong enough for car windscreens.
Glass
These are the two main categories of energy sources: one stays forever, and one disappears once used.
Renewable and non-renewable Energy
Modern high-speed internet uses very thin strands of glass to send information as pulses of light. What is this technology called?
Fibre optics
This microscopic fungus is used in a chemical change called fermentation to make bread fluffy.
yeast
To separate two liquids with different boiling points, you heat them up, catch the steam, and cool it back down. What is this process called?
Distillation
Classify these materials according to their origin: leather, wood, silk, wool, cotton, gypsum
• Leather, Wool, and Silk: from animals to make clothes and textiles.
• Wood and Cotton: vegetable origin. Wood is often used for furniture, while cotton is used for fabrics.
• Gypsum and Rocks: Materials like marble, granite, and gypsum are of mineral origin and are frequently used in building and construction.
Why are energy sources like oil and coal called “non-renewable”?
Because they run out.
This mineral is found in the Earth's crust and is used in special power stations to produce massive amounts of nuclear energy. What is it?
Uranium
What are the three states of matter?
Solid, liquid, gas