Exam 2.doc - Manaret eleman language schools Date:\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026 science department Prep.3 Model Examination

Exam 2.doc - Manaret eleman language schools...

This preview shows page 1 - 3 out of 6 pages.

Manaret eleman language schools science department Date:………………………………………………. Prep.3 Model Examination ( 2) Question (1 :( A- Complete the following: ( / 10 ( 1 - Sodium chloride is used in salting and preserve food 2The electric current is the flow of electric charges through a conductor 3 .……………- Nitrates are used in the manufacture of sensitive camera film . 4 - Sodium reacts with water and gives sodium hydroxide and hydrogen Gas evolves . 5 - At the beginning of the reaction the concentration of reactants is 100 % 6-2N 2 O 5 4NO 2 + O 2 7 - The measuring unit of current intensity is ampere but that of the quantity of electricity is coulomb B-What's meant by: 1-Electric current intensity passing through a conductor is 3 amperes The quantity of the electric charges passing through a conductor in one second = 3 coulombs 2-Super saturated solution. It is the solution which allows the dissolution of an additional amount of the solute with the increase in the temperature (the amount of the solute is greater than in the case of saturated solution) 3-Speed of chemical reaction. The change in the concentration of the reactants and resultants at a unit of time. Question (2): ( / 10 ( A- Write the scientific terms : 1
Image of page 1
1-A substance whose aqueous solution contains positive protons( Acids ) 2-They are chemical compounds decomposed by heat into element and oxygen gas evolves( Metal oxides ) 3-A chemical compound produced from the reaction of an acid with a base( Salts )
Image of page 2
Image of page 3

You've reached the end of your free preview.

Want to read all 6 pages?

  • Fall '18
  • mmmm
  • Chemistry, sodium nitrate, Sodium hydroxide

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes