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3 years ago

1. Which combinations of substances resulted in a chemical change?(no answer choices)

Chemistry

2 answers:

SOVA2 [1]3 years ago

6 0

Explanation:

Chemical reaction -

The combination or reaction of two or more substance , which leads to any change in the temperature , evolution of gas , change in color . This type of reaction is called a chemical reaction ,

The example of chemical reaction is as follows -

H₂ ( g ) + O₂ ( g ) ----> H₂O ( l )

In the above reaction , two gases combines together to form a completely new substance with different chemical and physical properties .

Hence , it is a chemical reaction .

Lunna [17]3 years ago

5 0

All chemical reaction between substances results into a chemical change. When two substances just like HCL and NaOH reacts with each other, NaCl means Sodium Chloride salt is formed.

The phenomenon like change in color, change in temperature, release of gas etc when happens ,then it means chemical change has been occurred. e.g

HCl +NaOH ----> NaCl +H2O.

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vampirchik [111]

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Explanation:

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2 years ago

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gulaghasi [49]

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3 years ago

5. __NH3 + __O2 >>>>>__ NO +__ H20

inn [45]

2 NH3+ 2 O2 —> 2 NO+ 3 H2O

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3 years ago

NISA [10]

Answer:

C. involve the attraction of opposite charges

Explanation:

Ionic bonding involves the attraction between oppositely charged ions, as in Na⁺ Cl⁻.

Covalent bonding involves the attraction between negatively charged electrons and positivey charged nuclei, as in a C-H bond.

A is wrong. Ionic bonding involves the transfer of electrons.

B is wrong. Covalent bonding involves the sharing of electrons.

D is wrong. Ionic bonds are usually stronger than covalent bonds.

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