<< Chapter < Page Chapter >> Page >

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:

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

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:

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

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

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
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
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Natural sciences grade 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11077/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natural sciences grade 7' conversation and receive update notifications?

Ask