Answer:
I think the answer is A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.
Explanation:
I hope this helps.
The Concenteration of a solution that has an absorbance of 0.420
is 5.27 μМ
<h3> </h3><h3>What is Absorbance ?</h3>
Absorbance (A), also known as optical density (OD), is the quantity of light absorbed by a solution.
Transmittance is the quantity of light that passes through a solution.
We can measures the absorbance of a sample using a spectrophotometer and the value is A = 0.420.
We can calculate the concentration of the sample using the Beer-Lambert law, which relates the attenuation of light to the properties of the material through which the light is travelling, through the following equation.
A = ∈ x c x d
Where ;
- A = Absorbance
- ∈ = molar absorptivity of the species (7.96 × 10⁴ M⁻¹ cm⁻¹)
- c = concentration
- d = optical path length (1.00 cm)
Therefore,
c = A / ∈ x d
= 0.420 / 7.96 × 10⁴ M⁻¹ cm⁻¹ x 1.00 cm
= 5.27 μМ
Learn more about spectrophotometer here ; brainly.com/question/20956841
#SPJ1
The flame test is commonly used to identify different metal ions by how they get excited in the presence of a flame.
Typically a nichrome wire is dipped in a solution of metal cations and then presented to a flame. The flame emits a different color than normal, depending on the type of metal cation. Each metal ion gets excited by the flame and as the electrons change energy levels they emit a photon of light, thus changing the color. Since each metal cation has unique energy levels, the colors differ depend on the metal cation.
I hope this helps.