Which pair will react with each other?sodium bromide and chlorine
sodium bromide and iodine
sodium chloride and bromine
sodium chloride and iodine

A rate equation can be written based on the rate constant k, concentration of reactants and half life time t1/2 of reactant if given. [A⁰] is the initial concentration of reactant A and  [A]t be the final concentration.

What is rate of reaction?

Rate of a reaction is the rate of decrease in concentration of reactants or rate of increase in concentration of products. Rate of the reaction written in terms of molar concentration of reactants is called the rate law.

Consider the simplest reaction A gives B. Here the only one reactant is A. The molar concentration of A is written as [A]. The rate constant k is then,

k = [B] / [A]

If any coefficients attached with them it is written as power of the concentration term. Now, the rate of the above reaction is written as follows:

rate r = k [A]

Sometimes the initial and final concentrations of A can be considered. Where, [A⁰] is the initial concentration and [A]t be the final concentration.

The half life t1/2 is the time taken to consume half of the reactants concentration.

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Answer: The number of atoms in given amount of oxygen gas is

Explanation:

According to the mole concept:

1 mole of a substance contains number of atoms.

We are given:

Moles of oxygen gas = 1 mole

So, the number of atoms that will be present in 1 mole of oxygen gas will be number of atoms.

Hence, the number of atoms in given amount of oxygen gas is

Answer:

Benzene is denser than ethanol.

Explanation:

Given data:

Volume of ethanol = 7.5 mL

Mass of ethanol = 5.85 g

Volume of benzene = 7.5 mL

Mass of benzene = 6.60 g

Which is denser = ?

Solution:

First of all we will calculate the density of both substances.

Density of ethanol:

d = m/v

d = 5.85 g/ 7.5 mL

d = 0.78 g/mL

Density of benzene:

d = m/v

d = 6.60 g/ 7.5 mL

d = 0.88 g/mL

The density of benzene is higher thus it is denser than ethanol.

Answer:

Benzene

Explanation:

You need to calculate the densities for each compound.

EtOH = 5.85/7.5 = 0.78 g/mL

Benzene = 6.60/7.5 = 0.88 g/mL

0.88 > 0.78, thus benzene is denser than ethanol.

The chemical formula for quartz is SiO_2

The chemical formula for quartz is SiO_2, which represents one silicon atom and two oxygen atoms in each formula unit.

Quartz is composed of silicon (Si) and oxygen (O) atoms bonded together in a specific arrangement. Its chemical formula, SiO2, represents this composition.

In quartz, each silicon atom is bonded to two oxygen atoms, and each oxygen atom is bonded to one silicon atom. This arrangement forms a three-dimensional network structure, making quartz a crystalline mineral.

The chemical formula SiO_2 provides a precise representation of the elements and their ratios in quartz.

Silicon and oxygen are the two elements that make up the mineral, and they are combined in a 1:2 ratio, meaning that for every silicon atom, there are two oxygen atoms.

This ratio is essential for understanding the stoichiometry and structure of quartz.

Quartz has various applications due to its unique properties, such as its hardness, transparency, and ability to transmit certain wavelengths of light, making it valuable in electronics, optics, and various industrial processes.

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Answer:

The de-exitation of electron to its lower energy level cause the emission spectrum of an element.

Explanation:

The electron is jumped into higher level and back into lower level by absorbing and releasing the energy.

The process is called excitation and de-excitation.

Excitation:

When the energy is provided to the atom the electrons by absorbing the energy jump to the higher energy levels. This process is called excitation. The amount of energy absorbed by the electron is exactly equal to the energy difference of orbits.  For example if electron jumped from K to L it must absorbed the energy which is equal the energy difference of these two level. The excited electron thus move back to lower energy level which is K by releasing the energy because electron can not stay longer in higher energy level and comes to ground state.

De-excitation:

When the excited electron fall back to the lower energy levels the energy is released in the form of radiations. This energy is exactly equal to the energy difference between the orbits. These radiations gives the emission spectrum of that element. The characteristics bright colors are due to the these emitted radiations. These emitted radiations can be seen if they are fall in the visible region of spectrum.

Final answer:

The atomic emission spectrum of an element is produced by the energy released when an electron transitions from a higher to a lower energy level. This energy is emitted as light, creating a unique spectrum that can be used to identify the element.

Explanation:

The atomic emission spectrum of an element is caused by the energy released when an electron in an atom moves from a higher energy level to a lower energy level. When an atom absorbs energy, it moves its orbiting electrons to a higher energy level. However, these electrons cannot maintain this high energy state for long, forcing them to transition back to their original or lower energy level. The energy they release during this transition is emitted in the form of light, creating a unique emission spectrum.

For example, hydrogen has a characteristic series of emission lines in its spectrum (Balmer series) because the electrons in a hydrogen atom can occupy specific energy levels. When these electrons drop from a higher energy level to a lower one, they emit light of specific wavelengths, creating the unique atomic emission spectrum of hydrogen.

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