Grade 5 Science Q1 Ep1: Properties of Materials

Summary

In this educational video, Grade 5 science teacher Vivian leads an exploration of material properties, crucial for safe and effective use. She introduces the concept of matter, its physical and chemical properties, and their applications in everyday objects like cooking pots. Through interactive questions and a practical example of making a toy doll, the lesson aims to deepen students' understanding of materials like metal, glass, plastic, and their respective properties such as malleability, combustibility, and thermal conductivity. The session concludes with a quiz to reinforce learning.

Takeaways

• 📚 The script is an educational video for grade 5 students, focusing on the properties of materials and their importance in everyday life.
• 🔍 The concept of 'matter' is introduced as anything that occupies space and has mass, with different states including solid, liquid, and gas.
• 🍳 A cooking pot is used as an example to illustrate the materials used in its construction, such as metal for the body, glass for the cover, and plastic for the handles.
• 🔨 Metals are highlighted for their malleability, which allows them to be shaped into various forms like the body of a cooking pot without breaking.
• 🔥 The script discusses combustibility, explaining why materials like wood, plastic, and paper are not suitable for cooking pots due to their tendency to burn.
• 🔊 The importance of thermal conductivity is covered, noting that metals are good conductors of heat, which is essential for cooking.
• ♨️ Plastic is identified as a poor conductor of heat, making it ideal for cooking pot handles to prevent heat transfer and potential burns.
• 👀 Glass is chosen for cooking pot lids due to its transparency, allowing users to see inside the pot without light scattering.
• 🧩 The distinction between physical and chemical properties of materials is made clear, with examples provided for each category.
• 🧲 Physical properties like hardness, brittleness, and malleability are characteristics that can be observed without changing the material's composition.
• 🌱 Chemical properties such as combustibility, flammability, toxicity, and reactivity are observed when a material undergoes a change to become a different substance.

Q & A

What is the definition of matter as discussed in the script?

Matter is defined as anything that occupies space and has mass. All objects we deal with every day are matter as they take up space and have mass.

Why are most cooking pots made of metal according to the script?

Most cooking pots are made of metal because metals have the property of malleability, allowing them to be shaped into different forms without breaking, and they are waterproof, preventing leakage of liquid ingredients.

What would happen if a cooking pot was made of wood, plastic, or paper?

If a cooking pot was made of wood, plastic, or paper, it would likely burn because these materials have a high combustibility and cannot withstand the heat from a fire like metals can.

Why are the handles of a cooking pot fitted with plastic?

The handles of a cooking pot are fitted with plastic because plastic has poor thermal conductivity, preventing heat from passing through and making it safe to touch even when the pot is hot.

Why is the cover of a cooking pot made of glass?

The cover of a cooking pot is made of glass because of its transparency, allowing users to see what is happening inside the pot without opening it, and its hard but fragile nature, which means it can resist deformation but is not easily broken.

What are the two types of properties of matter discussed in the script?

The two types of properties of matter discussed are physical properties, which can be observed or measured without changing the composition of the matter, and chemical properties, which are observed when matter undergoes a change to become a different substance.

What is the difference between flammability and combustibility as per the script?

Flammability refers to the ease with which a material can be ignited, while combustibility determines whether a material will easily burn or not.

What property of materials is demonstrated by a ceramic mug according to the script?

A ceramic mug demonstrates properties of being hard and fragile (brittleness), non-combustible, a poor conductor of heat (insulator), and non-toxic.

What property makes rubber suitable for making the body of a doll as described in the script?

Rubber is suitable for making the body of a doll because it is soft, flexible, and durable, and it does not break easily, demonstrating properties of elasticity and malleability.

What material is used for the hair and shoes of Maria's doll in the script, and why?

The hair and shoes of Maria's doll are made of plastic because it is flexible and waterproof, making it suitable for parts of a doll that may be exposed to wear and potential water contact.

What property of glass makes it a good choice for the cover of a cooking pot?

Glass is a good choice for the cover of a cooking pot because of its transparency, which allows users to observe the contents without opening the pot, and its brittleness, which means it can be made thin and strong.

Outlines

00:00

🔬 Introduction to the Science Lesson

The lesson begins with a warm greeting and an introduction to the topic: the properties of materials. The teacher, Vivian, engages the students with a scrambled word game to guess 'matter' and recalls the definition of matter. She then takes the students to a kitchen setting to observe a cooking pot made of metal, glass, and plastic, prompting them with questions about the materials used.

05:01

🔍 Exploring Properties of Materials

Vivian discusses the answers to the questions posed earlier, explaining why cooking pots are made of metal and not wood, plastic, or paper. She introduces the concepts of malleability, waterproofness, combustibility, thermal conductivity, flammability, and reactivity. The lesson emphasizes the importance of these properties in the context of cooking pots.

10:03

📜 Identifying Physical and Chemical Properties

The lesson continues with a deeper dive into the physical and chemical properties of materials. Vivian explains the importance of understanding properties like hardness, brittleness, flexibility, elasticity, waterproofness, and thermal conductivity. She also discusses the chemical properties such as combustibility, flammability, toxicity, and reactivity, using various examples.

15:06

🎨 Helping Maria with Her Assignment

Vivian introduces Maria, a grade 5 learner, who needs help with her assignment. The assignment involves making a toy and explaining the choice of materials. The students help Maria design a doll made of rubber, plastic, and cloth, explaining the properties that make these materials suitable for the toy.

20:09

📚 Quiz and Lesson Conclusion

The lesson concludes with a quiz to test the students' understanding of the properties of materials. Vivian reviews the answers, reinforcing the concepts of malleability, thermal conductivity, elasticity, and hardness. The lesson ends with praise for the students' performance and a reminder to study regularly.

Keywords

💡Matter

Matter is defined as anything that occupies space and has mass. In the context of the video, it is the fundamental concept around which the lesson on material properties is built. The script uses the term to introduce the idea that all objects, including those in a kitchen, are made of matter and exhibit various properties that are essential for their use and handling.

💡Properties of Materials

Properties of materials refer to the characteristics that define the behavior of a material under different conditions. The video script discusses two types of properties: physical and chemical. Physical properties can be observed without changing the material's composition, while chemical properties are observed when the material undergoes a change to become a different substance. These properties are crucial for understanding how materials are used in everyday objects like cooking pots.

💡Malleability

Malleability is the property of a material that allows it to be hammered or rolled into thin sheets without breaking. In the script, it is mentioned as a reason why metals are used to make the body of cooking pots, as they can be shaped into various forms to create the pot's structure.

💡Waterproofness

Waterproofness is the ability of a material to prevent water from passing through it. The video script explains that metal, like glass and plastic, is waterproof, which is why metal cooking pots can hold water without leaking, making them suitable for cooking.

💡Combustibility

Combustibility is the property of a material that determines whether it will easily burn. The script uses this term to explain why materials like wood, paper, and plastic are not suitable for cooking pots, as they would burn when exposed to the heat of a fire, unlike metals which are more resistant to burning.

💡Thermal Conductivity

Thermal conductivity is the property of a material that allows heat to pass through it. The video script mentions that metals have good thermal conductivity, which is why they are used for cooking pots, as they can efficiently transfer heat to the food being cooked.

💡Flammability

Flammability is the property of a material that determines how easily it can catch fire. The script distinguishes flammability from combustibility, noting that while both relate to burning, flammability is more about the ease of ignition, which is an important consideration for safety in materials used in cooking.

💡Reactivity

Reactivity is the property of a material that refers to its ability to undergo a chemical reaction with other materials. The video script points out that most metals are non-reactive, which means they won't react with the food being cooked, ensuring safety and preventing potential poisoning.

💡Toxicity

Toxicity is the property of a material that can cause harm or damage to an organism. In the context of the video, it is important that materials used for cookware are non-toxic to prevent any harmful effects from the substances that may leach into the food during cooking.

💡Elasticity

Elasticity is the property of a material that allows it to be stretched and then return to its original shape once the stress is removed. The script uses this term to explain why rubber is used for the handles of cooking pots, as it can withstand the stretching caused by holding the pot without deforming permanently.

💡Transparency

Transparency is the property of a material that allows light to pass through it without scattering significantly. The video script mentions that the cover of a cooking pot is made of a certain kind of glass to allow visibility of the food being cooked, which is an application of transparency.

Highlights

Introduction to the properties of materials and their importance in science.

Exploring the definition of matter as anything that occupies space and has mass.

Differentiating between the physical and chemical properties of matter.

Understanding malleability as the ability of metals to be shaped without breaking.

Discussing waterproofness as a key property for materials used in cooking pots.

The importance of combustibility in material choice for cooking pots.

Thermal conductivity as a factor in the efficiency of cooking pots.

Flammability and its relation to the safety of materials used in cooking.

Reactivity as a property that affects the interaction between cookware and food.

The use of plastic for cooking pot handles due to poor thermal conductivity.

Glass as a material for cooking pot lids due to its transparency.

The identification of physical properties such as hardness, brittleness, and malleability.

Chemical properties like combustibility, flammability, toxicity, and reactivity.

Practical application of material properties in creating a safe and durable toy.

Engaging with a hypothetical scenario to help a student named Maria with her assignment.

The significance of choosing materials based on their properties for toy design.

Interactive quiz to test understanding of material properties.

Review and reinforcement of key concepts through a self-test quiz.

Conclusion and summary of the lesson on material properties.

Transcripts

[Music]

as a young terrific day to you

kids together we'll explore

discover and find answers to the

mysteries of the world through

science i am your grade 5

super science teacher vivian

today we will learn about the properties

of materials

and why it is important to understand

these in using and handling them

are you excited let's go

join me let's enter the kingdom where

fun

and exciting learning experiences are

about to happen

only here at that edtv

i will be flashing a scrambled word on

the screen

guess what the correct word is

are you ready great

what word is this

[Music]

this word is matter

did you get it very good

can you still remember what is matter

let's recall matter

is defined as anything that occupies

space

and has mass all objects

we deal every day are all matter they

take up space

and they also have mess as discussed

in your science 3 matter comes into

different faces

which can be solid

liquid and gas

other phases of matter will be discussed

in your higher science subject

oops where do you think are we now

we are in a kitchen

for sure you all have seen and even used

a cooking pot

but can you name some properties of the

materials used in making cooking pots

children take a look at it it may

or may not look exactly the same as that

in your homes

but the parts are usually made of the

same materials

the cooking pot that you are seeing has

a body made of metal

a cover made of glass

and handles are fitted with plastic

let's go back to our classroom and

discuss what we have seen in the kitchen

but before we go to the properties of

the materials used in making cooking

pots

i'd like you to think of the answers to

the following questions

number one why are most cooking pots

made of metal number two

what will happen if the cooking pot is

made of wood

plastic or paper number three

what will happen if the cooking pot is

made of concrete

which is a mixture of cement water

and sand number four

why are the handles of the cooking pot

fitted with

plastic number five

why is the cover of the cooking pot made

of glass

i know you have your own answers in mind

before we check let us know first what

properties mean

and its two kinds properties

are the external and internal

characteristics of an

object there are two kinds of properties

of

matter first we have the physical

properties

that refer to the characteristics of

matter

that can be observed or measured without

changing its composition

some examples are malleability

[Music]

flexibility brittleness

elasticity waterproofness

and thermal conductivity

the second one is the chemical

properties

that refer to the internal composition

of matter

that can be measured and observed when

matter

undergoes change to become an entirely

different substance

some examples are toxicity

reactivity flammability

and combustibility

did you get it more of that as we

continue with

our discussion let's check your answers

and watch out for the terms that relate

to the properties of materials

are you ready let's go back to question

number one

why are most cooking pots are made of

metal

most cooking pots are made of metal

because unlike wood glass or plastic

metals can be hammered into different

shapes without

breaking this property of metals that

makes them easy to shape

such as the cooking pot's body is called

malleability

cooking usually involves water as an

ingredient

and metal like glass and plastic are

waterproof

this property that enables the metal

cooking pot

to prevent the liquid ingredients of

what is being cooked

from leaking refers to its

waterproofness

[Music]

let's discuss your answer for question

number two

what will happen if the cooking pot is

made of wood

plastic or paper if the cooking pot

is made of wood plastic or paper

it will burn because when cooking pot is

used to cook

food it is placed over fire

while cooking pots which are made of

metal

do not easily burn it can withstand the

heat

wood paper and plastic are examples of

materials that

easily burn the property of materials

that determines

whether or not they will easily burn is

called

combustibility

[Music]

when cooking pots are usually placed

over

fire metals can withstand the heat

and metals allow the heat from the fire

to pass through

into what is being cooked the property

of materials

that determines whether or not heat can

easily pass through the material

is called thermal conductivity

a related but different property which

is differentiated from combustibility

in terms of the ease with which a

combustible material can be

ignited is referred as flammability

how about the answer for question number

three

what will happen if the cooking pot is

made of concrete

which is a mixture of cement water

and sand the answer is no it will take a

longer time to cook the food

because heat cannot easily pass through

it

concrete is not as good a thermal

conductor as

metals another important consideration

in cooking

is to make sure that the material of the

cooking pot does not react with the

ingredients of the food of being cooked

[Music]

the property of materials that refers to

their ability

to undergo chemical reaction with other

materials

is known as reactivity

[Music]

most metals are non-reactive so it will

not

undergo chemical reaction with the

ingredients that may cause

poisoning making them safe as materials

for making cooking pots

it is important to use safe cookware

when preparing

food toxicity is the property of a

material to which a chemical substance

or a particular mixture of substances

can damage or harm an organism

how about question number four why are

the handles of the cooking pot

fitted with plastic the poor thermal

conductivity of a certain materials like

plastic

is also the reason why handles of the

cooking pot

are fitted with plastic because heat

cannot easily pass through plastic

in some cooking pots rubber is used

aside from being a good insulator rubber

also has the ability to be stretched and

returned to its original shape when the

stress is removed

a property called elasticity

again elasticity is the ability of

a material to be stretched and returned

to its original shape when the stress is

removed

lastly for question number five why is

the cover

of a cooking pot made of glass

the cover of a cooking pot is made of

certain kind of glass

so that one can easily see what is going

on inside

because glass is transparent

transparency is the ability of a

material

that allows light to pass through

without so much scattering

unlike plastic which easily deforms when

heated

less is hard and can resist deformation

however unlike metal which does not

break

easily glass is fragile

brittleness is a property which refers

to being both

hard and fragile now that you are

familiar with the properties of

materials

let's try what you've got let's identify

the object in terms of

brittleness combustibility

thermal conductivity and toxicity

put a check on the box that closely

describe the materials

object number one is a ceramic mug

let's identify its properties one by one

ceramic is made up of a mixture of clay

water and powder is it hard and flexible

or hard and fragile it is hard and

fragile

it easily breaks when accidentally

pushed

as to combustibility a ceramic mug

combustible

or non-combustible the answer is

non-combustible ceramics like plant pots

figurines and cups do not easily burn

how about as to its thermal conductivity

does it allow heat to pass through

it's a poor conductor of heat therefore

it's an insulator when it comes to its

toxicity

a ceramic mug toxic or non-toxic

it's a non-toxic material in fact

we use plates bowls and cups

which are made of ceramic

[Music]

let's move on to object number two a

wooden

hanger a wooden hanger is made of wood

is it hard and fragile or hard and

flexible

it is hard and fragile a wooden hanger

is breakable in terms of combustibility

do you think it will burn or not

remember it's a wood of course it will

burn

therefore it's combustible

what about in terms of thermal

conductivity

does it allow heat to pass through

no it's not therefore it's an insulator

how about its toxicity is it toxic

or non-toxic wood is non-toxic

in fact some of our kitchen utensils are

made of wood

and for the last object we have a

mineral plastic bottle

is it hard and fragile or hard and

flexible

it is hard and flexible it does not

break

easily when in terms of combustibility

is it combustible or non-combustible

it is combustible plastic is an example

of a combustible material does it allow

heat to pass through

it is not a good conductor of heat

therefore

it's an insulator that is why

handles of a cooking pot are fitted with

plastic

next is it toxic or non-toxic

it is a non-toxic material we even used

food containers which are made of

plastic

perfect are you still with me

good based on the properties mentioned

a while ago let's identify the physical

properties

and the chemical properties the

following

are the common physical properties of

materials

we have hardness

brittleness flexibility

elasticity waterproofness

thermal conductivity and malleability

they showed characteristics of matter

that can be observed or measured

without changing its composition

how about the common chemical properties

we have combustibility flammability

toxicity and reactivity

this group of properties are observed

or measured when matter undergoes change

to become an entirely different

substance

now i want you to sit back listen and

relax for a moment

i have a friend named maria

are you excited to meet

lend me your ears and eyes as i begin to

introduce her

maria is a grade 5 learner

let's say hi maria hi maria

do you know what maria needs

maria is here to ask help from us

she needs help in making her assignment

i want to help maria would you want to

help her too

is it a yes very good

her assignment goes this way if you were

to make a toy

what would you want to make and what

materials would you use

so that it will be safe to play and

durable

at the same time make a drawing of this

toy

and explain why would you use the

materials that you have

identified do you have an idea children

let's see what maria wants

oh i guess she wants a doll

children let's bring it on let's help

maria

maria's doll is made of rubber it is

safe to play

because it is soft flexible and durable

it does not break easily as well

the hair and shoes of maria's doll is

made of plastic

it is flexible and waterproof

the dress of maria's doll is made of

cloth

which is soft so that when it tears she

can just sew it

when it's dirty or has stained she can

just

wash it now let's give this to maria

how was that children did you enjoy

helping maria

if you are give me a smile

before we end this lesson let's try to

test yourself

read each questions carefully and choose

the letter

of the correct answer number one

which common property is evident

when crown caps or tencent can be

hammered into sheets

to make a doormat or an improvised

tambourine

a elasticity

b flexibility

c hardness d

malleability number two

white cooking pots are not made of wood

plastic or paper children

choose the correct statement or

statements below

one wood plastic

and paper are combustible they will burn

when placed over

fire two papers will absorb water and

easily get wet three

plastics will melt when exposed to too

much heat

four woods are not good conductors of

heat

it will not cook the food a

one only b two and three

c two three and

four d one

two three and four

number three which solid material

below is a good thermal conductor

a aluminum foil

b paper c

plastic bottle the

wine glass number four

which of the following solid materials

has the ability to be stretched

and can return to its original shape

when stress is removed

a mirror b

rubber band c sponge

d wood

number five which of the following

properties

describes the ability of a material

to resist pressure that may cause

deformation

or change in shape a malleability

b elasticity c

flexibility d hardness

are you done let's check your answer

number one if your answer is letter d

malleability you are correct

malleability is the ability of a

material

that can be hammered into sheets without

breaking

number two if your answer is letter d

statements one two

three and four are all correct

that's another point for you

cooking pots are not made of wood

plastic or paper because they are

combustible

they will burn when placed over fire

number three if your answer is letter a

aluminum foil you are correct

that is because metals like aluminum

are good conductors of heat they absorb

heat

very easily number four

if your answer is letter b rubber band

you are correct rubber band has the

ability to be stretched

and returned to its original shape when

the stress is removed

lastly we go to number five

if you answered letter d hardness

perfect you got it right

hardness is the ability of a material

to resist pressure that may cause

deformation

or change in shape did you get a perfect

score

wow let's all clap for ourselves

you did a great job

[Applause]

that's the end of our lesson i hope

you've learned

something new today this is your grade 5

super science teacher viviane

always remember make it a habit to study

it works till next time

[Music]

bye

[Music]

you