Test Initial Clasa A 9-a

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�ntrebri: 5 | Attempts: 3,855 | Updated: Mar 22, 2023

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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.

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1
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.

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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 → CuCO₃→ 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.

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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).

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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.

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Current Version
Mar 22, 2023

Quiz Edited by
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Sep 13, 2010

Quiz Created by
Popalacramioara

Test Initial Clasa A 9-a

Care sunt simbolurile chimice ale carbonului, potasiului si azotului .

Atomul contine particule incarcate:

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 → CuCO3 → Fe + CuSO4 → MgO +H2O →

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

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

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 → CuCO₃→ Fe + CuSO₄ → MgO +H₂O →