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Physics

Posted by nthabi

an unknown mass x of sodium carbonate is dissolved in a 200 cubic centimetres of distilled water. in a titration15 cubic centimetres of the solution was used to neutralise 24 cubic centimetres to neutralise 24 cubic centimetres if a 0.12 mol.dm3 hydrochloric acid solution.1. determine the concentration of sodium chloride solution?2. calculate the unknown mass x?3. what is the appropriate indicator for the solution.
  • 1.
    sodium chloride concentration? You sure? (0,07 mol.dm-3)

    2.
    2,0352g

    3.
    strong acid + weak base
    indicator = methyl orange

    (i will check with the developers if images can be allowed here. Then I will upload my full solution.)
    Answered by V. Gokal


Mathematics

Posted by tebatso

is zero a number? If zero is a number why they say that any number to the exponent zero is one, but when you use zero to the exponent zero it gives you error?
  • This is a very long explanation!
    Regarded as indeterminate.

    Google it. You get some crazy explanations!
    Answered by V. Gokal


Physics

Posted by karin H kelder,Derick Govender and Jagathesan Govender

Explain briefly hw doppler effect functions nd what it may be used for?
  • example:
    If a car approaches with a siren on, each new pulse from the siren has a shorter and shorter distance to travel to reach you (the car is getting closer to you). This creates a higher frequency of pulses for the listener. Hence a higher frequency is heard.

    Uses include:
    1) to measure the rate of blood flow
    2) or the heartbeat of a foetus in the womb
    3) speed traps (radar type)
    4) used to measure the speed at which stars and galaxies are approaching or receding from us
    Answered by V. Gokal


Mathematics

Posted by Faaizah Kader

Some take pi as 22/7 which will be termed a rational number. Some take it as 3.14.... non-recurring or non-terminating. That be irrational.Question to anybody interested in answering: What do we classify pi as??? Which value do we introduce from point of initiating it's use?P.N: Grades 8 and 9 learners do not use programmable calculators that have the pi button.
  • Pi is rational. An answer to my own question.
    Answered by Faaizah Kader


Physics

Posted by V. Gokal

To use DualView ....
preferred browsers
1) Chrome (all OS)
2) Edge (Windows 10)
  • Answered by Pending

    If you are unsure about the answer, please allow another user to reply.

Business Studies

Posted by Lubbe

Greetings may it be possible for the business studies teachers to post some tests for the learners to engage in as it may benefit us?
  • Answered by Pending

    If you are unsure about the answer, please allow another user to reply.

History

Posted by Elder Etieneobong Ekereuke

Who was the First National President of The Apostolic Church Nigeria?

Chemistry

Posted by Az. Khan

What is the ester used to give the smell of icecream ?🍦
  • Vanillin-a flavouring agent
    Answered by Phyllistar


Chemistry

Posted by shubham

demo
  • Hi!
    Demo answer.
    Answered by V. Gokal


Physics

Posted by Shankar

What is a "retarding force"? I've seen this in a couple of past year papers and was not sure what they meant. They mostly asked it like :" Find the retarding force... "
  • A retarding force is a force that is opposing the motion of the object.
    A good example would be friction force.
    Answered by V. Gokal


Physics

Posted by Vilashni

when working withthe mechanical energy formulae , how do you kmow when to indicate potential energy as zero?
  • The "h" is zero.

    Or there is no height h in the question.
    Answered by V. Gokal


Accounting

Posted by Jaya Gupta

question by jaya account
  • testing answers by another account
    Answered by Honey Gupta


Business Studies

Posted by Jaya Gupta

dfgdfgdf fgdfgfg dfgfgdfgdf
  • hello this is my answer corrected my jaya account
    google.com
    Please be aware of malicious links that may be posted, the full adress name is pasted here for you to see.
    Answered by Honey Gupta


Accounting

Posted by Jaya Gupta

what is account?
  • account is a subject
    Answered by Jaya Gupta


Posted by Meloshnee

What is the motor effect
  • The motor effect occurs when a current carrying conductor experiences a force in the presence of a magnetic field.
    Answered by V. Gokal


Physics

Posted by Suvan Naidu

What does effective resistance mean ?
  • Effective resistance is also called total resistance.
    But be careful since a question can ask for the effective resistance (total resistance) of just a parallel section of an entire big circuit. The you calculate just for that parallel.
    Answered by V. Gokal


Posted by ahmedsetar

when drawing graphs in electrodynamics for ac or dc (current and voltage). ..should we write a zero on the graph?. ..my teacher said not to
  • Zero is written at the origin. Not elsewhere.
    You can find such examples in CatView.
    Answered by V. Gokal


Physics

Posted by ahmedsetar

in electricity when asked "what does an emf of 12V mean" how do u explain it in terms of joules per coulomb ?
  • 12J of energy are transferred to (work done on) each coulomb of charge (per C) charge passing through the battery
    (Nov 2013)
    V = W/Q
    Answered by V. Gokal


Physics

Posted by Y.Jaglal

Hey E-forum!:)
  • Hey there!
    Answered by V. Gokal


Physical Science

Posted by Meloshnee

What is dynamic equilibrium?
  • The rate of the forward reaction equals to the rate of the reverse reaction. (The reaction rates have not stopped, just equalised.)
    Answered by V. Gokal

  • Answered by nokwanda magwenyana

Physical Science

Posted by Kershlyn

Test
  • Thank you, Kershlyn.
    Answered by V. Gokal


Physical Science

Posted by V. Gokal

Hi.Testing the Forum.
  • Hello
    Answered by Kershlyn