What is the oxidation number for sodium?A
2-
B
1+
C
2+
D
1-

Answer:

A branch of science

Explanation:

CHemistry is the investigation and studying substances and their reaction with other elements

Answer:

chemistry :-

A branch of science in which we. . study about chemical

in the chemistry we studied about. elements and compounds and their

composition and reaction

In chemistry and phase equilibria, phase transition is a common phenomenon. There are many terms related to the phase transition. The process deposition is a physical process. This process is the opposite of sublimation.

Deposition is a phase transfer or phase transition process in which a substance in the gaseous state changes directly to the solid state. Freezing of air is an example of deposition in which the water vapour directly changes to ice.

Here the gaseous state converts into solid state without being in the liquid state.

An example is:

CO₂ (g) → CO₂ (s)

To know more about phase transition, visit;

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Given:

128g sample ofwater

2808J of heatenergy

Required:

Change intemperature

Solution:

This can be solvedthrough the equation H = mCpTwhere H is the heat, m is the mass, Cp is the specific heat and T is the change in temperature.

The specific heatof the water is 4.18 J/g-K

Plugging in thevalues into the equation

H = mCpT

2808J = (128g)(4.18 J/g-K) T

T= 5.25 K

Answer:

            This Metal belongs to Group I (Alkali Metals).

Explanation:

                    Alkali Metals present in Group I are considered as the most reactive metals in periodic table. There reactivity increases tremendously down the group. The reactivity is mainly due to less ionization energies. Therefore, going from top to bottom along the group the ionization energies decreases hence, increasing there reactivity respectively.

                   Alkali metals when reacted with water undergoes an exothermic reaction resulting the formation of corresponding metal hydroxide and hydrogen gas i.e.

                                     2 M  +  2 H₂O    →     2 MOH  +   H₂

                   Also, these metals are in solid state at room temperature (i.e. 25 °C) and their boiling points are as follow,

                                                Lithium  =  180.5 °C

                                                Sodium  =  97.79 °C

                                                Potassium  =  63.5 °C

                                                Rubidium  =  39.48 °C

                                                Cesium  =  28.44 °C