HCl solution, about 250 mL in volume. The pH of the solution is 1.37. Calculate the molar concentration of HCl in this solution. Please use the scientific presentation of the numerical answers (i.e., 1.23x 102), and round your answers to two decimal places.

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

Final answer:

The oxidation state of nitrogen in NaNO2 is +3. This figure is calculated by balancing the charges in the molecule to zero, with sodium assigned +1 and oxygen assigned -2 as their oxidation states.

Explanation:

The oxidation state of an element in a compound refers to the hypothetical charge that an atom would have if all bonds to atoms of different elements were 100% ionic. For NaNO2, the sodium (Na) has an oxidation state of +1, and the oxygen (O) has an oxidation state of -2 each. The molecule is neutral, with charge of zero. Thus, if we let x represent the oxidation state of nitrogen (N), we set up the equation:

+1 + x + 2(-2) = 0

Solving for x gives us:

x = +1 - 2*(-2) = +3.

So, the oxidation state of nitrogen in NaNO2 is +3.

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Answer:

The mechanical energy of the system increases, provided there is no loss of energy due to friction. The energy would transform to kinetic energy when the speed is increasing. The mechanical energy of the system remains constant provided there is no loss of energy due to friction.

Explanation:

Final answer:

An object's mechanical energy generally increases as its velocity increases. This is because mechanical energy is the sum of an object's kinetic and potential energy, and kinetic energy is directly proportional to the square of its velocity.

Explanation:

In physics, mechanical energy is the energy that an object has due to its motion (kinetic energy) and position (potential energy). When an object's speed or velocity changes, specifically increases, so does its kinetic energy, as kinetic energy is directly proportional to the square of the object's velocity. Essentially, if an object's velocity doubles, its kinetic energy would quadruple. However, this does not take into account variables like air resistance, friction, or changes in potential energy. In an ideal, frictionless scenario, an increase in an object's velocity directly results in an increase in its mechanical energy.

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Answer: The correct answer is-

C.accurate.

As per the information in the question, a group of scientists has proposed a new theory on Adaptation, which is accepted by majority of scientists worldwide. This indicates that the proposed theory is most likely to be accurate.

A scientific theory is an explanation of certain aspects of nature that is based on some facts as well as evidences. It is tested, observed, and proven right on the basis of repeated experimentation.

As the theory on Adaptation is accepted by majority of the scientists, it means that it is most likely to be accurate.

Thus, option C) is the right answer.

Answer:

3

Explanation:

Iron-53 is a radioactive isotope of iron. It undergoes radioactive decay in order to become more stable. The process of radioactive decay involves the emission of particles or radiation from an unstable nucleus, resulting in a more stable form of the original element.

What happens when it goes through the radioactive decay ?

When iron-53 undergoes radioactive decay, it is transformed into an isotope of manganese. Specifically, it decays into manganese-53, which is a stable isotope of manganese.

This process of decay is known as beta decay, and it involves the emission of an electron (a beta particle) and a neutrino from the nucleus of the iron-53 atom. This causes the iron-53 atom to become a manganese-53 atom, which is more stable than the original iron-53 atom.

The process of radioactive decay is an important part of the natural decay of elements. It is a natural process that occurs in nature and is not caused by human activity.

Radioactive decay is responsible for the formation of many elements in nature, and it is also responsible for the formation of many of the elements that are used in everyday life.

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