Answer:
Emission spectroscopy is a helpful tool in determining the identity of materials in fields like forensic science because it has the ability to identify and characterize the elements in a sample obtained for forensic analysis. It accomplishes this by making the sample go through a medium that can disperse the atoms and ions in the element at specified wavelengths.
Explanation:
Atomic emission spectroscopy is a method used in the laboratory to characterize the elements found in a sample needed for a study when they pass through a flame. Inductively coupled plasma is a type of atomic emission spectroscopy which has the ability to excite the components of an element at specific wavelengths when they undergo electromagnetic radiation.
This method can identify the isotopes, atom, and ions present in a sample. This is useful in forensics as it aids the identification of the elements in the sample.
Answer: sum of the pressure of the two gases present.
Explanation:
According to Dalton's law, the total pressure of a mixture of gases is the sum of individual pressures exerted by the constituent gases.
For example if there are there are two gases hydrogen and oxygen with individual pressure of 30 and 20 atm each. Then the total pressure in the container will be:
Thus 
Thus if two gases are present in a container, the total pressure in the container is equal to sum of the pressure of the two gases present.
Every chemical reaction requires a minimum amount of energy to undergo reaction.
The total energy required is Threshold energy. The chemicals have some internal energy and they require some extra energy which is known as activation energy.
The reaction occurs when two molecules or atoms come closer to each other and for this they need kinetic energy.
Now for an effective collision the two molecules or atoms should collide with a minimum amount of energy so that they may undergo reaction so again they need some energy
These kinetic energy and energy for effective collision is actually called as activation energy.
<span>Avogadro's number
represents the number of units in one mole of any substance. This has the value
of 6.022 x 10^23 units / mole. This number can be used to convert the number of
atoms or molecules into number of moles. We do as follows:
0.24 g (1 mol / 342.3 g) (
6.022 x 10^23 molecules / 1 mol ) =4.222 x 10^20 molecules
</span>
Explanation:
Ionic solids are defined as the solids in which atoms of opposite charge are held together by strong forces of attraction. As a result, in solid state these atoms are not present in free state.
Hence, they cannot move as ions from one place to another. On the other hand, metals are able to conduct electricity because of the presence of free electrons in it.
As we know that electricity is the flow of ions or electrons from one place to another. Therefore, metals are able to conduct electricity in their solid state.
