Chemistry Questions

Q:

A proton is identical to _____.

A) the nucleus of helium B) the nucleus of a hydrogen atom
C) an alpha-particle D) a beta particle
 
Answer & Explanation Answer: D) a beta particle

Explanation:
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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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Q:

The PCl5 molecule has trigonal bipyramidal structure. Therefore,the hybridization of p orbitals should be

A) sp2 B) sp3
C) dsp2 D) dsp3
 
Answer & Explanation Answer: D) dsp3

Explanation:

The P atom needs five orbitals to form the five P-Cl bonds. It has a 3s and three 3p orbitals, so it must use one of its 3d orbitals to form the fifth bond. These orbitals are hybridized to form five sp3d orbitals that just happen to point in the right directions to form a trigonal bipyramid.

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Q:

A feature of catabolic reactions is that they

A) occur only in mitochondria B) occur only during loss of body weight
C) involve release of energy D) involve consumption of energy
 
Answer & Explanation Answer: C) involve release of energy

Explanation:
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Q:

Which of the following is a major function of chloride?

A) Helps maintain gastric acidity B) Acts as principal intracellular electrolyte
C) Acts as principal intracellular electrolyte D) All of the above
 
Answer & Explanation Answer: A) Helps maintain gastric acidity

Explanation:
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Q:

Anaerobic glycolysis occurs without

A) water B) glucose
C) oxygen D) All of the above
 
Answer & Explanation Answer: C) oxygen

Explanation:

Anaerobic glycolysis is the transformation of glucose to lactate when limited amounts of oxygen (O2) are available. 

 

Hence, Anaerobic glycolysis occurs without oxygen.

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Q:

Which two atoms form an ionic bond?

Answer

Ionic bonding is a type of chemical bond in which valence electrons are lost from one atom and gained by another.. This bond generates two oppositely charged ions.


In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.


 


Example ::


One example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom. In this reaction, the sodium atom loses its single valence electron to the fluorine atom, which has just enough space to accept it. The ions produced are oppositely charged and are attracted to one another due to electrostatic forces.

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Q:

What are cathode rays made of?

Answer

Cathode rays made of beams of electrons.

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