<< Chapter < Page Chapter >> Page >

Natural sciences

Matter, measuring and reactions

Educator section

Memorandum

Groupwork:

Observation: The glowing wooden splinter catches fire because oxygen has been released.

Conclusion: Mercury oxide is a compound that decomposed as a result of heating. It broke up into oxygen (a gas) and mercury (a metal).

Mercury Oxide = mercury + oxygen

Leaner section

Content

Activity: to investigate the breaking up of compounds into simpler substances [lo 1.2, lo 1.3]

Group work:

Do the following experiment in your groups to determine whether mercuric oxide is a compound consisting of elements. Follow the different steps exactly:

  • Pour a small amount of mercuric oxide, which is red in colour, into a test tube.
  • Heat it over a Bunsen burner or the flame of a candle in a well-ventilated room.
  • Wait for the mercuric oxide to turn black and for small droplets of mercury to collect on the cooler side of the test tube.
  • Insert a glowing splinter of wood into the top of the test tube. Observe the reaction that occurs.

Observation: _________________________________________________________

____________________________________________________________________

____________________________________________________________________

Deduction: __________________________________________________________

____________________________________________________________________

____________________________________________________________________

Assessment

MARK LEVEL COOPERATIVELEARNING SKILLS VALUES AND ATTITUDES CONTENT
1-34% 1 Each learner learns individually. Participation in the group is destructive, e.g. domineering. No respect for others. Destructive interpersonal relationships (actively negative). Not able to come to meaningful observations and deductions.
35-39 % 2 Does not contribute to the group and forms no meaningful part of it. Not respectful towards others, but this does not affect interpersonal relationships (negatively passive). Observations and deductions fairly sound.
40-69% 3 Acknowledged as a member of the group. Sensitive to the needs of others. Shows consideration for others and understanding of different points of view, but this has no effect on interpersonal relationships (positively passive). Observations and deductions sound.
70-100% 4 Creates opportunities for contributions by other members of the group. Always contributes positively to the group task. Shows consideration for others and understanding of different points of view. Influences interpersonal relationships in a positive way (positively active). Observations and deductions excellent.

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 1.2: We know this when the learner conducts investigations and collects data: organises and uses apparatus/equipment or sources to gain and record information;

Assessment Standard 1.3: We know this when the learner evaluates data and communicates findings: generalises in terms of relevant aspects and describes how the data support the generalisation.

Questions & Answers

calculate molarity of NaOH solution when 25.0ml of NaOH titrated with 27.2ml of 0.2m H2SO4
Gasin Reply
what's Thermochemistry
rhoda Reply
the study of the heat energy which is associated with chemical reactions
Kaddija
How was CH4 and o2 was able to produce (Co2)and (H2o
Edafe Reply
explain please
Victory
First twenty elements with their valences
Martine Reply
what is chemistry
asue Reply
what is atom
asue
what is the best way to define periodic table for jamb
Damilola Reply
what is the change of matter from one state to another
Elijah Reply
what is isolation of organic compounds
IKyernum Reply
what is atomic radius
ThankGod Reply
Read Chapter 6, section 5
Dr
Read Chapter 6, section 5
Kareem
Atomic radius is the radius of the atom and is also called the orbital radius
Kareem
atomic radius is the distance between the nucleus of an atom and its valence shell
Amos
Read Chapter 6, section 5
paulino
Bohr's model of the theory atom
Ayom Reply
is there a question?
Dr
when a gas is compressed why it becomes hot?
ATOMIC
It has no oxygen then
Goldyei
read the chapter on thermochemistry...the sections on "PV" work and the First Law of Thermodynamics should help..
Dr
Which element react with water
Mukthar Reply
Mgo
Ibeh
an increase in the pressure of a gas results in the decrease of its
Valentina Reply
definition of the periodic table
Cosmos Reply
What is the lkenes
Da Reply
what were atoms composed of?
Moses Reply
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




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