Test Initial Clasa A 9-a

Approved & Edited by ProProfs Editorial Team
The editorial team at ProProfs Quizzes consists of a select group of subject experts, trivia writers, and quiz masters who have authored over 10,000 quizzes taken by more than 100 million users. This team includes our in-house seasoned quiz moderators and subject matter experts. Our editorial experts, spread across the world, are rigorously trained using our comprehensive guidelines to ensure that you receive the highest quality quizzes.
Learn about Our Editorial Process
| By Popalacramioara
P
Popalacramioara
Community Contributor
Quizzes Created: 1 | Total Attempts: 3,857
�ntrebri: 5 | Attempts: 3,857

SettingsSettingsSettings
Test Initial Clasa A 9-a - Quiz

Rezolvati pe foaie separata exercitiile de mai jos fara a mai copia si enunturile.


Questions and Answers
  • 1. 

    Care sunt simbolurile chimice ale carbonului, potasiului si azotului .

    • A.

      Ca

    • B.

      K,

    • C.

      N

    • D.

      P

    • E.

      C

    Correct Answer(s)
    B. K,
    C. N
    E. C
    Explanation
    The correct answer provides the correct symbols for carbon (C), potassium (K), and nitrogen (N). The symbols for these elements are widely used in chemistry to represent them in chemical equations and formulas.

    Rate this question:

  • 2. 

    Atomul contine particule incarcate:

    • A.

      Pozitiv, negativ, neutre

    • B.

      Nu contine nici un fel de particula

    • C.

      Numai particule incarcate negativ

    • D.

      Numai particule incarcate neutre

    • E.

      Numai particule incarcate pozitiv

    Correct Answer
    A. Pozitiv, negativ, neutre
    Explanation
    An atom contains particles that are positively charged (protons), negatively charged (electrons), and neutral (neutrons). These particles are essential for the structure and behavior of an atom. Protons and neutrons are located in the nucleus of the atom, while electrons orbit around the nucleus. The balance between the positive charge of protons and the negative charge of electrons determines the overall charge of the atom, which can be neutral, positive, or negative. Therefore, the correct answer is that an atom contains positively charged, negatively charged, and neutral particles.

    Rate this question:

  • 3. 

    Completati urmatoarele reactii chimice si precizati denumirile reactantilor si a produsilor de reactie si indicati carui tip de reactie apartine fiecare exemplu . Na+ H2O    → CaO + HCl  → CuCO→  Fe + CuSO4   → MgO +H2O   →

    Correct Answer
    NaOH + 1/2H2, reactie de substitutie CaCl2 + H2O, reactie de dublu schimb CuO + CO2, reactie de descompunere FeSO4 + Cu, reactie de substitutie Mg(OH)2, reactie de combinare
    Explanation
    In the given reactions, the reactants and products are as follows:
    1. Na + H2O → NaOH + 1/2H2 (sodium + water → sodium hydroxide + hydrogen gas) - This is a substitution reaction.
    2. CaO + HCl → CaCl2 + H2O (calcium oxide + hydrochloric acid → calcium chloride + water) - This is a double displacement reaction.
    3. CuCO3 → CuO + CO2 (copper carbonate → copper oxide + carbon dioxide) - This is a decomposition reaction.
    4. Fe + CuSO4 → FeSO4 + Cu (iron + copper sulfate → iron sulfate + copper) - This is a substitution reaction.
    5. MgO + H2O → Mg(OH)2 (magnesium oxide + water → magnesium hydroxide) - This is a combination reaction.

    Rate this question:

  • 4. 

    Masele de substanţe necesare preparării a 300g soluţie de NaCl de concentraţie 5% sunt 15g sare de bucatarie si 285g apa.

    • A.

      15g sare de bucatarie si 285g apa.

    • B.

      5g sare de bucatarie si 300g apa

    Correct Answer
    A. 15g sare de bucatarie si 285g apa.
    Explanation
    The correct answer is 15g salt and 285g water. This is because the question asks for the substances needed to prepare a 300g solution of NaCl with a concentration of 5%. Since the concentration is given as a percentage, it means that the solution is 5% NaCl and 95% water. Therefore, to prepare the solution, you would need 15g of salt (which is 5% of 300g) and 285g of water (which is 95% of 300g).

    Rate this question:

  • 5. 

    Scrieti formulele chimice pentru următoarele substanţe : oxid de magneziu carbonat de calciu oxid de aluminiuazotat de argint hidroxid de potasiuacid clorhidric hidroxid de calciu acid fosforic

    Correct Answer
    Mg O CaCO3 Al2O3 AgNO3 KOH HCl Ca(OH)2 H3PO4
    Explanation
    The given answer provides the correct chemical formulas for the substances listed. Each formula represents the combination of elements in the compound. For example, MgO represents magnesium oxide, CaCO3 represents calcium carbonate, Al2O3 represents aluminum oxide, AgNO3 represents silver nitrate, KOH represents potassium hydroxide, HCl represents hydrochloric acid, Ca(OH)2 represents calcium hydroxide, and H3PO4 represents phosphoric acid.

    Rate this question:

Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 13, 2010
    Quiz Created by
    Popalacramioara
Back to Top Back to top
Advertisement
×

Wait!
Here's an interesting quiz for you.

We have other quizzes matching your interest.