Fenomene Fizice SI Fenomene Chimice - Test GriLA Cu Raspuns LA Alegere -

1. Transformările corpurilor care nu schimbă felul substanţelor sunt:

fenomene fizice;

fenomene chimice;

atât fenomene fizice cât şi fenomene chimice.

The correct answer is "fenomene fizice." This is because physical transformations do not change the nature or composition of substances. These transformations only alter the physical properties of the substance, such as shape, size, or state of matter, without creating new substances. On the other hand, chemical transformations involve the formation of new substances with different properties through chemical reactions. Therefore, only physical transformations can occur without changing the nature of substances.

Explanation

The correct answer is "fenomene fizice." This is because physical transformations do not change the nature or composition of substances. These transformations only alter the physical properties of the substance, such as shape, size, or state of matter, without creating new substances. On the other hand, chemical transformations involve the formation of new substances with different properties through chemical reactions. Therefore, only physical transformations can occur without changing the nature of substances.

2. Transformarea sucului de struguri în vin se numeşte:

fierberea mustului şi este un fenomen fizic;

fermentaţia mustului şi este un fenomen chimic;

atât fierbere cât şi fermentare, dar nu este un fenomen.

The transformation of grape juice into wine is called fermentation, which is a chemical phenomenon. During fermentation, yeast converts the sugars in the grape juice into alcohol and carbon dioxide. This process is essential in the production of wine and is responsible for its unique flavor and alcoholic content.

Explanation

The transformation of grape juice into wine is called fermentation, which is a chemical phenomenon. During fermentation, yeast converts the sugars in the grape juice into alcohol and carbon dioxide. This process is essential in the production of wine and is responsible for its unique flavor and alcoholic content.

3. Transformările corpurilor care schimba felul substanţelor sunt:

Fenomenele fizice;

fenomenele chimice;

atât fenomene fizice cât și chimice

The correct answer is "fenomenele chimice" because chemical transformations are processes that involve the rearrangement of atoms and the formation of new chemical substances. These transformations result in changes in the chemical properties of the substances involved, such as their composition, reactivity, and energy content. Physical phenomena, on the other hand, refer to processes that do not involve a change in the chemical nature of the substances, but rather only affect their physical properties, such as their state, shape, or size. Therefore, only chemical phenomena can change the nature of substances.

Explanation

The correct answer is "fenomenele chimice" because chemical transformations are processes that involve the rearrangement of atoms and the formation of new chemical substances. These transformations result in changes in the chemical properties of the substances involved, such as their composition, reactivity, and energy content. Physical phenomena, on the other hand, refer to processes that do not involve a change in the chemical nature of the substances, but rather only affect their physical properties, such as their state, shape, or size. Therefore, only chemical phenomena can change the nature of substances.

4. Prin incalzire puternică, o bucata de carne se carbonizează. Se produce:

un fenomen fizic;

un fenomen chimic;

nu se produce nici un fenomen.

When a piece of meat is subjected to intense heat, it undergoes a chemical process called carbonization. This involves the breakdown of organic compounds present in the meat, resulting in the formation of carbon and other byproducts. This transformation is a chemical reaction rather than a physical change, as it involves the alteration of the molecular structure of the meat. Therefore, the correct answer is "un fenomen chimic" (a chemical phenomenon).

Explanation

When a piece of meat is subjected to intense heat, it undergoes a chemical process called carbonization. This involves the breakdown of organic compounds present in the meat, resulting in the formation of carbon and other byproducts. This transformation is a chemical reaction rather than a physical change, as it involves the alteration of the molecular structure of the meat. Therefore, the correct answer is "un fenomen chimic" (a chemical phenomenon).

5. Modificarea stărilor de agregare este un fenomen:

chimic şi reversibil;

fizic şi reversibil;

atat fizic cât şi chimic, dar ireversibil.

The correct answer is "fizic şi reversibil" because the question is asking about the phenomenon of changing states of matter. This change is physical because it involves the rearrangement of molecules or atoms within a substance, and it is reversible because it can be undone by changing the conditions (such as temperature or pressure) back to their original state.

Explanation

The correct answer is "fizic şi reversibil" because the question is asking about the phenomenon of changing states of matter. This change is physical because it involves the rearrangement of molecules or atoms within a substance, and it is reversible because it can be undone by changing the conditions (such as temperature or pressure) back to their original state.

6. Orice schimbare sau transformare se numește fenomen. Acestea sunt ?

fenomene naturale;

fenomene artificiale;

fenomene naturale sau fenomene artificiale;

The correct answer is "fenomene naturale sau fenomene artificiale." This is because the question asks for the name of any change or transformation, and both natural and artificial phenomena can fit this description. Therefore, the correct answer includes both options.

Explanation

The correct answer is "fenomene naturale sau fenomene artificiale." This is because the question asks for the name of any change or transformation, and both natural and artificial phenomena can fit this description. Therefore, the correct answer includes both options.

7. Plantele sunt adevarate "uzine chimice", producătoare de oxigen prin procesul numit:

homeosinteza, care este un fenomen fizic;

fotosinteza, care este un fenomen fizic;

fotosinteza, care este un fenomen chimic.

Plants are true "chemical factories" that produce oxygen through the process of photosynthesis, which is a chemical phenomenon.

Explanation

Plants are true "chemical factories" that produce oxygen through the process of photosynthesis, which is a chemical phenomenon.

8. Curcubeul, descompunerea luminii, topirea, solidificarea, vaporizarea, condensarea sunt:

fenomene fizice;

fenomene chimice;

patru fenomene fizice şi două fenomene chimice.

The given options list different phenomena, such as the rainbow, decomposition of light, melting, solidification, vaporization, and condensation. These phenomena are all examples of physical changes, where the substance undergoes a change in its physical state or appearance without any alteration in its chemical composition. Therefore, the correct answer is "fenomene fizice" which means physical phenomena.

Explanation

The given options list different phenomena, such as the rainbow, decomposition of light, melting, solidification, vaporization, and condensation. These phenomena are all examples of physical changes, where the substance undergoes a change in its physical state or appearance without any alteration in its chemical composition. Therefore, the correct answer is "fenomene fizice" which means physical phenomena.

9. Ruginirea fierului, formarea ceţii, coclirea aramei, dilatarea şinelor de tren, obtinerea oţetului sunt:

trei fenomene fizice şi două fenomene chimice;

patru fenomene chimice şi un fenomen fizic;

două fenomene fizice şi trei fenomene chimice.

The answer "două fenomene fizice şi trei fenomene chimice" is correct because it states that there are two physical phenomena (ruginirea fierului, dilatarea şinelor de tren) and three chemical phenomena (formarea ceţii, coclirea aramei, obtinerea oţetului). This accurately represents the given list of phenomena and their classifications.

Explanation

The answer "două fenomene fizice şi trei fenomene chimice" is correct because it states that there are two physical phenomena (ruginirea fierului, dilatarea şinelor de tren) and three chemical phenomena (formarea ceţii, coclirea aramei, obtinerea oţetului). This accurately represents the given list of phenomena and their classifications.