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Natural sciences

Matter, measuring and reactions

Educator section


  • The wood block has the greatest mass.

1. Density = mass per volume. Therefore

(a) = 1,6 g/cm 3

(b) = 2,5 g/cm 3

(c) 8,7 g/cm 3

(d) = 7,7 g/cm 3

(e) 0,8 g/cm 3

2. Use two liquids that do not mix. Pour them in a glass jug. The liquid with the lower density will float on the other, e.g. oil on water.

Leaner section


Activity: to describe and applythe concept density [lo 1.1, lo 2.4]

Drop a 50-cent coin and a wooden block into a glass dish that is half full of water. The coin will sink and the wooden block will float.

  • Which one has the greater mass?


The block weighs more than the coin, but floats because it has less density. When we combine the mass and the volume of a substance, we are dealing with the density of the particular substance.

The five blocks below are of equal size, but are made of different substances. The volume of each is exactly 10 cubic centimetres (10 cm3). The approximate mass of each is given.

We can compare the mass of the five substances because they have the same volume.

The mass in gram of 1 cmз of a substance is known as its density.

1. Indicate the density of each of the blocks.

(a) __________________________________________________________________

(b) __________________________________________________________________

(c) __________________________________________________________________

(d) __________________________________________________________________

(e) __________________________________________________________________

2. Describe what you would do (with the help of a glass beaker and two liquid substances) to illustrate that the density of different liquid substances also varies. (Suggestion: First decide which liquids you would use).


















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 2.4: We know this when the learner application of knowledge: applies knowledge appropriately by connecting the learnt concept to a variation of the known situation.

Questions & Answers

how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
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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