SCIENCE 5
RECOGNIZING USEFUL AND
HARMFUL MATERIALS
Materials are said to be useful
when they serve their purpose.
These may have
properties such as durability,
flexibility, elasticity, hardness,
and resistance to water,
heat, or acid.
Most of the useful
materials can be
reused and
recycled.
Some useful materials
may also bring
hazards.
Toxic substances may
also be present in the
things you
commonly use such as
paints, cleaners, fumes,
gels, or powders.
Examples of useful materials
Old newspapers
Candy wrappers
Examples of useful materials
Vegetable peelings
Empty jars
Examples of harmful materials
Used syringe
Drained batteries
Examples of harmful materials
Rusted metal containers
Broken gadgets
ACTIVITY
Identify the following as USEFUL or HARMFUL.
Broken Glass
An empty bottle
A bag made of
candy wrapper
Vegetable peelings
made into compost
Used boxes as organizers
Make a product out of any recyclable materials
found in your home.
Examples:
A flower vase made of
plastic disposable spoon.
Flowers made of plastic
bottles
Examples:
Pen holder made of old
newspaper
Wall decor
SCIENCE 6
Describing Mixtures
Mixtures are combinations
of two or more substances
that can be
homogeneous or
heterogeneous.
Homogeneous mixtures appear uniform all
throughout because they have the same
proportion.
Example:
Coffee
wine
Air
Heterogeneous mixtures are not uniform in proportion
where combined substances are not evenly
spread or mixed.
Example:
pizza
Chocolate chip cookie
salad
ACTIVITY: Classify the following mixtures as
HOMOGENEOUS or HETEROGENEOUS.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Magnet
Seeds
Clouds
Fruits
Lugaw
Alum (tawas)
Paint
Palabok
Alcohol
Macaroni Salad
ASSIGNMENT:
Give 5 examples of
HOMOGENEOUS mixture
and 5 examples of
HETEROGENEOUS mixture
found in your home.