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Which pure substance can be classified as an element?

A. [tex]\( H_2 \)[/tex]
B. [tex]\( NO_3 \)[/tex]
C. [tex]\( NaCl \)[/tex]
D. [tex]\( H_2SO_4 \)[/tex]

Sagot :

GinnyAnswer
To determine which pure substance can be classified as an element, let's examine each given substance:

1. [tex]\( H_2 \)[/tex] (Hydrogen gas):
- This consists of two hydrogen atoms bonded together.
- Hydrogen is a chemical element, denoted by the symbol H.
- Thus, [tex]\( H_2 \)[/tex] is an element.

2. [tex]\( NO_3 \)[/tex] (Nitrate):
- This consists of one nitrogen atom and three oxygen atoms.
- It is a compound, not an element, because it contains multiple types of atoms.

3. [tex]\( NaCl \)[/tex] (Sodium chloride, or table salt):
- This consists of one sodium atom and one chlorine atom bonded together.
- It is a compound because it also contains multiple types of atoms.

4. [tex]\( H_2SO_4 \)[/tex] (Sulfuric acid):
- This consists of two hydrogen atoms, one sulfur atom, and four oxygen atoms.
- It is also a compound, containing different types of atoms.

Based on this examination, the pure substance that can be classified as an element is [tex]\( H_2 \)[/tex].

Therefore, the correct answer is:
[tex]\[ 0 \][/tex] (corresponding to [tex]\( H_2 \)[/tex]).
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