5. Which group of elements reacts violently with water? A noble gases B. alkali

Question

5. Which group of elements reacts violently with water? A noble gases B. alkali metals C alkaline earth metals D. halogens 6, A sample of pure lithium carbonate contains 18.8 % lithium by mass. What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample? A. 75.2% B. 9.40 % C. 37.6% D. 18.8% 7. Which statements are TRUE concerning particles that make up atoms? I. The mass comes solely from the neutrons Il. The atomic number of a neutral atom equals the number of electrons and the number of protons. Ill. The protons and the neutrons are contained in the nucleus A Iand B. I and I C. Il and I D. I, Il, and Ill 8. Which statement is FALSE? A The atoms in ammonia are joined by covalent bonds. B. The air around us is considered a mixture. C. An ionic bond results from the transfer of one or more electrons from one atom to D. Sodium and chloride ions arrange themselves into discrete molecules of NaCl as 9. Which section of the periodic table is most likely to form anions? D. D 10. Which figure represents diatomic molecules? A. B.

Explanation / Answer

5) we have

noble gas ---> having inert electronic configuration and therefore no valene electrons to react with water.

alkali metals ---> have a very losely bound valence electron which reacts with water very rapidly.

alkaline earth metals ----> have valence electrons but does not react violently.

halogens ---> do not react voilently with water as they do not have electrons to give.

therefore

the correct answer is :

b. alkali metals.

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