Chemistry Questions

Q:

Which statement is true of all atoms that are anions?

A) The atom has more electrons than protons B) The atom has more protons than electrons
C) The atom has equal number of protons and electrons D) All of the above
 
Answer & Explanation Answer: A) The atom has more electrons than protons

Explanation:
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Q:

Is boiling water a chemical change?

Answer

No. Boiling water is not a chemical change. Because in this process it doesn't loss its properties. It just changes its state i.e, from liquid state to gaseous.


 


Hence, Boiling water is a Physiacl change and not a chemical change.

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Q:

Steel contains

A) no carbon B) < 2% of carbon
C) > 10% of carbon D) > 29% of carbon
 
Answer & Explanation Answer: B) < 2% of carbon

Explanation:

To make steel, iron ore is first mined from the ground. It is then smelted in blast furnaces where the impurities are removed and carbon is added.

In simple, steel is iron alloyed with carbon, usually 0 - 2%.

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Q:

The pH value of a sample of multiple-distilled water is

A) zero B) 14
C) very near to zero D) very near to seven
 
Answer & Explanation Answer: D) very near to seven

Explanation:

Water  is  neutral  and  has  a  pH value  of  7  and  because  here it  is multiple distilled water, it would be very near to seven

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Q:

Which equation is an example of a synthesis reaction?

A) 2H2 + O2 → 2H2O B) Na + Cl → NaCl
C) HA + BOH → H2O + BA D) NaCl + AgNO3 → NaNO3 + AgCl
 
Answer & Explanation Answer: B) Na + Cl → NaCl

Explanation:

When two or more chemical species combine to form a single product, the reaction is said to be synthesis reaction. It is also called as Direct Combination reaction.

 

Here in the given options, Sodium (Na) combines with Chlorine (Cl) to form a more complex single product Sodium Chloride (NaCl).

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Q:

The mass number of an isotope of an element is 298. If its nucleus has 189 neutrons, what is its atomic number?

A) 298 B) 189
C) 109 D) 487
 
Answer & Explanation Answer: C) 109

Explanation:
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Q:

Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water

A) Magnesium B) Calcium
C) Manganese D) Chromium
 
Answer & Explanation Answer: C) Manganese

Explanation:
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Q:

Magnesium is a constituent metal of __________

A) Chlorophyll molecule B) DNA
C) Mitochondria D) Ribosomes
 
Answer & Explanation Answer: A) Chlorophyll molecule

Explanation:
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