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Natural sciences

Matter, measuring and reactions

Educator section

Memorandum

1. Answers may vary from one individual to another:

CONTAINER ESTIMATED VOLUME CORRECT VOLUME
Coffee mug 250 mℓ 270 mℓ
Kettle 1 litre 1,704 litre
Tea pot 400 mℓ 592 mℓ
  • Meniscus: This is the curvature of the surface of a liquid due to the liquid's clinging to the sides of the container, to form an upside-down bow.

Assignment 7:

You sip up the liquid and put your finger on the top end as quickly as possible. Then you lift your finger and let the water drain until the meniscus is level with the line. You use it when you want to measure exactly 25 mℓ or 50 mℓ (or any size of the pipette) to add to something.

  • Burette: The readings will depend on the size of the spoons.

Leaner section

Content

Activity: to measure the volume of liquid substances [lo 1.1, lo 2.3]

MEASURING WITH THE HELP OF A MEASURING CYLINDER

Volume refers to the contents of particular spaces. When you buy a cold drink, you pay for a particular amount of liquid that fills a specific space.

This amount of cold drink can also be described as the volume of cold drink.

Volumes can be measured with the help of a measuring cylinder, a burette or a pipette.

Before learning about how to use these measuring instruments, we have to take note of the errors of parallax that might occur and about how to avoid them.

By using a measuring cylinder frequently, you will develop your skill in estimating correctly.

1. Use a typical measuring cylinder to measure the volume of the following containers (and to see how accurate your estimation is):

Container Estimated volume Correct volume
Coffee mug __________________ __________________
Kettle __________________ __________________
Teapot __________________ __________________

Two basic rules have to be considered for taking a correct reading from a measuring cylinder:

  • Your eye should be in line with the lower level of the surface of the water (meniscus);
  • The measuring cylinder has to be placed on a level surface and not be tilted, as in the illustrated example!

Explain what a meniscus is, using your own words:

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MEASURING WITH THE HELP OF A PIPETTE

Study the following illustration to get to know a pipette:

ASSIGNMENT 7

  • Give your own explanation of how a pipette is used to obtain a reading:

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MEASURING WITH THE HELP OF A BURETTE:

A burette is used to measure liquid volume.

It is particularly suitable for measuring volumes smaller than 50 cm.

Burettes are calibrated (marked in divisions) from top to bottom and usually are more accurate than measuring cylinders.

The amount of liquid that is tapped from a burette can simply be read from the burette by checking the level of the meniscus.

Study the burette attentively to be able to discuss its method of working with a partner:

Now use the burette to measure the following volumes:

Object Estimated volume Correct volume
Teaspoon __________________ __________________
Soup spoon __________________ __________________
Tablespoon __________________ __________________
Ladle __________________ __________________

Assessment

Learning Outcome 1: The learner will be able to act confidently on curiosity about natural phenomena, and to investigate relationships and solve problems in scientific, technological and environmental contexts.

Assessment Standard 1.1: We know this when the learner plans investigations: plans simple tests and comparisons and considers how to conduct these properly.

Learning Outcome 2: The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

Assessment Standard 2.3: We know this when the learner interprets information by identifying key ideas in text, finding patterns in recorded data, and making inferences from information in various forms (e.g. pictures, diagrams, text).

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Natural sciences grade 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11077/1.1
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