Test 1 Chapter 1-3 Multiple Cholce Identify the choice that best completes the s

Question

Test 1 Chapter 1-3 Multiple Cholce Identify the choice that best completes the statement or answers the question. o. Which of the following represents a valid upothesis a Argon does not react with oxygen. | Sodium metal reacts violently with water d is soft and malleable d. Nitrogen is a gas at room temperature. 4. Two or more substances in variable proportions, where the composition is variable throughout are 18. The correct answer (reported to 12.5 x 9.68 the proper number of significant figures) to the following is: b. 121.0000 c. 121.000 d. 121.00 e. 121.0 44. Give a possible molecular formula for the empirical formula of C.H.CIO

Explanation / Answer

10)

Hypothesis is an explanation or prediction of the result of an observable process or phenomenon.

Though all the statements are correct but they do not relate to a process, but states one specific result

correct option :e) As all metals tends to lose electrons (a phenomena observed typical for metals)

a) Argon does not react with oxygen

Argon is a noble gas with completely filled valence orbitals ,so it is inert and do not react with any element

b)Sodium metal reacts violently with water

Sodium metals react vigorously with water giving NaOH, H2 and a lot of heat as the reaction is highly exothermic

2Na(s)+2H2O(l) --->2NaOH(aq) +H2(g)

c) Lead is soft and malleable

Lead is a dense,soft ,malleable and ductile metal with low melting point

d)Nitrogen is a gas at room temperature

Nitrogen comprises 78 percent of atmospheric gases and is gas at room temperature

e) Metal tends to lose electrons

Metals have 1,2,3 electrons in their valence shell which is easier to be lost to reach the octet state or completely filled electron configuration,so they tend to lose electrons to non-metals and become positively charged ions.

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