1
This means to make new items out of used or waste materials.
recycle
This is a physical change of a material from liquid to solid.
solidification
Snow forms in clouds as well as frost on the ground are some of its examples.
deposition
This occurs when pollutants are directly or indirectly discharged into different bodies of water such as lakes, rivers, oceans, and even underground water which is the source of drinking water.
water pollution
This means to use again. There are many things we own that can be used more than once or given to someone else to use.
reuse
Pulverizing coffee beans is a type of this change in matter.
physical change
This occurs when heat is removed from water vapor. When this happens, water vapor becomes liquid water.
condensation
It is the complete opposite of solidification. It is the change from solid to liquid.
melting
Rusted nails is a type of this change in matter.
chemical change
This substances usually have a hazard symbol on their labels so that people can easily identify them.
toxic substances
What is the density of water?
1g/cm3
What is the main cause of water pollution?
human activities
It is a common problem, no matter if it is a city or a rural region. People just throw their garbage on the ground without caring about the adverse effects on the environment.
littering
What is the formula in finding the density?
D = m/v
What is the formula in finding the volume?
Volume= LWH
Give the 4 causes of water pollution.
Dumping solid waste
Oil spill
Industrial waste
Sewage system
Give the 6 phase changes in physical change.
Solidification
Melting
Evaporation
Condensation
Sublimation
Deposition
This is formed when sulfur dioxide and nitrogen dioxide are dissolve in raindrops.
Acid Rain
Give 3 causes of land pollution.
deforestation
agricultural activities
mining activities
overcrowded landfills
industrialization
littering
Give 2 harmful materials/
sharp/pointed objects
toxic substances
metal objects that underwent oxidation
Find the density of a small cork with a mass of 450 grams and a volume of 50cm3.
D= m/v
D= "450g" /"50cm3 "
D= 9g/cm3
What is the volume of the box with a length of 10cm a width of 5cm and a height of 2cm?
Volume= LWH
L= 10cm W= 5cm H=2cm
V =10cm x 5cm x 2cm=100cm3
What is the volume of the box with a length of 20cm a width of 8cm and a height of 2cm?
Volume= LWH
L= 20cm W= 8cm H=2cm
V =20cm x 8cm x 2cm=320cm3
An object has a mass of 525g and a volume of 5cm3. What is its density?
D= m/v
D= "525g" /"5cm3 "
D= 105g/cm3
What is the volume of the rock with a length of 10cm a width of 3cm and a height of 5cm?
Volume= LWH
L= 10cm W= 3cm H=5cm
V =10cm x 3cm x 5cm=150cm3