1
Q:

Which reaction occurs spontaneously?

A) Cl2(g) + 2NaF(aq)--> F2(g) + 2NaCl(aq) B) I2(s) + 2NaF(aq)--> F2(g) + 2NaI(aq)
C) Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq) D) I2(s) + 2NaBr(aq)--> Br2(l) + 2NaI(aq)

Answer:   C) Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq)



Explanation:

In this chemical reaction chlorine change oxidation number from 0 to -1 (reduction) and bromine change oxidation number from -1 to 0 (oxidation).

Chlorine is stronger oxidation reagent than bromine.

In VIIA or group 17 (halogen elements) there are six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and tennessin(Ts).

They have high electronegativity because they have seven valence electrons in their outermost energy level, so they can gain an electron to have the octet rule.  

Going down in the group, element are weaker oxidazing reagent and less reactive.

Subject: Chemistry
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Q:

After cleaning the thermometer should be placed in

A) Sanitizer B) Ice cold water
C) Mercury D) None of the above
 
Answer & Explanation Answer: A) Sanitizer

Explanation:
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1 53
Q:

Rank these compounds by boiling point- Pentane, Propane and Hexane.

A) Pentane > Propane > Hexane B) Propane > Pentane > Hexane
C) Hexane > Pentane > Propane D) Propane > Hexane > Pentane
 
Answer & Explanation Answer: C) Hexane > Pentane > Propane

Explanation:

The boiling point of the compounds depend on the number of carbons in them. Hexane has 6, Pentane has 5 and Propane has 3 carbons. As Hexane is with 6 carbons it has highest boiling point and next Pentane with 5 and lowest Propane with 3. 

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0 61
Q:

The chemical makeup of a rock is

A) Nutrients B) Minerals
C) Metals D) Water
 
Answer & Explanation Answer: B) Minerals

Explanation:

The chemical composition of a rock is mainly minerals.

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1 42
Q:

Which kind of energy is stored in a chemical bond?

A) Potential energy B) Kinetic energy
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) Potential energy

Explanation:
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0 56
Q:

which of the following molecule contains a nonpolar covalent bond?

A) Br2 B) CO2
C) CCl4 D) CO
 
Answer & Explanation Answer: A) Br2

Explanation:

Br-Br.

In Br2, two of the same atoms, pull on each side of the bond is equal making it as non-polar.

The other options all include a significantly more electronegative atom (the oxygens and the chlorine), so those bonds are all polar covalent.

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0 34
Q:

Arrange the following compounds in order of increasing acidity?

A) o-cresol < phenol < o-nitrophtenol B) phenol < o-nitrophtenol < o-cresol
C) o-nitrophtenol < o-cresol < phenol D) None of the above
 
Answer & Explanation Answer: A) o-cresol < phenol < o-nitrophtenol

Explanation:
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0 71
Q:

The number of electron levels in a magnesium atom is

A) 3 B) 2
C) 1 D) 0
 
Answer & Explanation Answer: A) 3

Explanation:
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0 81
Q:

What two elements are used to make bronze?

A) Lead and copper B) copper and tin
C) Tin and lead D) copper and iron
 
Answer & Explanation Answer: C) Tin and lead

Explanation:

The two elements that are used to make bronze are tin and lead.

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