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kicyunya [14]
2 years ago
8

Which of the following demonstrates a double-replacement reaction?

Chemistry
2 answers:
Korolek [52]2 years ago
8 0

<u>Answer:</u> The correct answer is Option A.

<u>Explanation:</u>

For the given options:

<u>Option A:</u>  Na_3PO_4+MnCl_2\rightarrow Mn_3(PO_4)_2+NaCl

This reaction is considered as a double displacement reaction because here exchange of ions takes place.

<u>Option B:</u>  CaCO_3\rightarrow CaO+CO_2

This reaction is considered as a decomposition reaction because here one substance is breaking into two smaller substances.

<u>Option C:</u>  2Mg+O_2\rightarrow 2MgO

This reaction is considered as a synthesis reaction because here two smaller substances are combining in their elemental state to form a single large substance.

<u>Option D:</u>  2AgNO_3+Cu\rightarrow 2Ag+Cu(NO_3)_2

This reaction is considered as a single displacement reaction because here more reactive element displaces a less reactive element from its chemical reaction.

Hence, the correct answer is Option A.

Volgvan2 years ago
6 0
A: Na3PO4 + MnCl2 > Mn3(PO4)2 + NaCl
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Answer: pure substances.


Explanation:


The given substances are:

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All what surrounds us, which has mass and occupies spaces, is matter. There are two kind of matter: pure substances and mixtures.


Pure substances have a uniform and constant composition. On the other hand, mixtures are combinations of two or more pure substances in  any arbitratry ratio.


Pure substances may be elements or compounds. The elements are the substances conmposed by one only kind of atom. In the list of substances given, Li and O₂ are elements: all the atoms in Li are lithium, and all the atoms in O₂ are oxygen atoms.


Compounds are the chemical combination of two or more different kind of atoms. In the given list H₂O₂ and NaCl are compounds. As you see, H₂O₂ contains atoms of hydrogen and oxygen, chemically bonded, in a fixed ratio (2 atoms of hydrogen by 2 atoms of oxygen). And NaCl has atoms of Na (sodium) and Cl (chlorine), chemicaly bonded, in a fixed ratio (1:1).


There are only 118 known elements and you can find them in any modern periodic table. Therer are virtually infinitely many compounds since many different combinations of the elements can be attained.


Elements and compounds have in common that they are classified as pure substances.


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While balancing a chemical equation, the basic rule is to balance the coefficient as required. Coefficient represents the number of molecules and is used at front of a chemical symbol. Change in coefficient helps balance the number of atoms or molecules of the substances on both the sides of the arrow.

Subscripts are never allowed to change because it can change the chemical involved in the reaction.

Hence, the correct answer is "c. add coefficients as needed".

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