In this lab, you will use the flame test to identify the metal ion in two

In this lab, you will use the flame test to identify the metal ion in two boxes of unidentified fireworks. Write an investigative question that you can answer by doing this experiment.

2 months ago

Solution 1

Guest Guest #1021
2 months ago
In a flame photometric analysis, salt solution is first vaporized using the heat of flame, followed by this electrons from valance shell gets excited from ground state to excited state. Followed by this de-excitation of electron bring backs electrons to ground state. This process is accompanied by emission of photon. The photon emitted is characteristic of an element, and number of photons emitted can be used for quantitative analysis. 

Following are the investigative question that you can answer by doing this experiment.
1) What information can be obtained from the colour of flame?
2) State the relationship between wavelength, frequency, and energy?
3) Can you identify the metal present in unknown sample provided?
4) How will you identify amount of metal present in sample solution?
Why do different chemicals emit light of different colour?

Solution 2

Guest Guest #1022
2 months ago

The first one is chlorine ion, the second one is metal ion.

📚 Related Questions

What aspect of a hurricane determines how much rain will fall
Solution 1
THE TRACK OF THE STORM determines how much rain will fall.Hurricane refers to a storm with violent wind, it usually occurs in tropical Caribbean areas. Each hurricane has five essential aspects that can cause damage, these are: flood, wind, surge, heavy rains and tornadoes.

a solution has a volume of 2.0L and contains 36.0 g of glucose. If the molar mass of glucose is 180 g/mol, what is the morality if the solution?
Solution 1
Find moles: 
36.0 g of glucose divided by 180 g/mol = 0.200 moles of glucose 

find molarity: 
0.200 moles of glucose / 2 litres = 0.100 Molar solution 
A sample of gas occupies 10.0 l at 100.0 torr and 27.0 c. calculate the pressure if the temperature is changed to 127c while the volume remains constant. (133 torr)
Solution 1
The pressure  of a sample  of a gas if the temperature  is changed  to 127  c  while  the volume  remains  constant   is calculated  using gay lussac law formula

that is P1/T1 = P2/V2
P1 = 100 torr
T1 = 27+273 = 300 k
T2 =127 +273 =400 k

by  making P2 the subject of the formula

=100  x 400/300 = 133.3 torr

Identify the missing daughter nucleus in the β– emission decay of 106ru below.
Solution 1
Answer is: the missing daughter nucleus is rhodium (Rh).

Nuclear reaction: ¹⁰⁶Ru → ¹⁰⁶Rh + e⁻(electron) + ve(electron antineutrino).

Beta decay is radioactive decay in which a beta ray and a neutrino are emitted from an atomic nucleus.There are two types of beta decay: beta minus and beta plus.

In beta minus decay, neutron is converted to a proton and an electron and an electron antineutrino.
In beta plus decay, a proton is converted to a neutron and positron and an electron neutrino, so mass number does not change.

Given the reaction that occurs in an electrochemical cell: zn(s) + cuso4(aq) znso4(aq) + cu(s) during this reaction, the oxidation number of zn changes from
Solution 1

Answer : The correct answer is oxidation number of Zn changes from 0 to +2.

Oxidation number :

It is number given to an element when it undergoes oxidation by loosing electrons . Oxidation number is equal to number of electrons donated . It is generally represented as charge .

Oxidation number of any element in a compound can be calculated as :

(Total number of positive charge) + (total number of negative charge) = total charge on compound

Where : Total positive charge = No. of atom or polyatomic molecule * positive charge on it

Total negative charge = No. of atom or polyatomic molecule * negative charge on it

Total charge on compound = Charge lying on top of compound .

Following steps can be used to find change in oxidation number of Zn :

Step 1 ) : To find oxidation number of Zn ( reactant side ) :

On reactant side Zn is present in solid state or its elemental state . It is not attached to any other atom , hence it is neutral and isolated atom. So oxidation number on Zn(s) is 0 .

Step 2: To find oxidation number of Zn in ZnSO₄ (aq)

ZnSO₄(aq) is ionic compound compound . It has two ions in it, Zn and SO₄ . Also it is a neutral compound means it has zero charge on it .

SO₄ is sulfate which has -2 charge or oxidation number on it (image attached )and there is one molecule of SO₄ ion . There is one atom of Zn which has unknown charge or oxidation number (x) .

To calculate oxidation number on Zn ion , plug values in above formula :

(No of Zn atom * charge on it ) + (No of SO₄ molecule * charge on it ) = Total charge on ZnSO₄

( 1* charge on Zn ) + ( 1* -2 ) = 0

Charge on Zn + (-2) = 0

Charge on Zn = +2

On reactant side Zn(s) has Zero charge and on product side Zn in ZnSO₄(aq) has +2 charge .

Hence the charge in oxidation number of Zn is from 0 to +2 .

Solution 2
0 to +2 is the answer to this question
For a reaction to be spontaneous under standard conditions at all temperatures, the signs of δh° and δs° must be __________ and __________, respectively.
Solution 1
For a reaction to be spontaneous under standard conditions at all temperatures, the signs of ΔH° and ΔS° must be negative and positive, respectively.
Gibbs free energy (G) determines if reaction will proceed spontaneously, if ΔG is negative, reaction is spontaneous.
ΔG = ΔH - T·ΔS.
ΔG - changes in Gibbs free energy.
ΔH - changes in enthalpy.
ΔS - changes in entropy.
T is temperature in Kelvins.

In the simulation, open the micro mode, then select solutions indicated below from the dropdown above the beaker in the simulation. the beaker will fill up to the 0.50 l mark with the solution at 25 ∘c. arrange the acids in increasing order of acidity. rank from lowest to highest. to rank items as equivalent, overlap th
Solution 1
Milk (lowest acidity) < Coffee < Orange juice < Soda pops < vomit < Battery acid (highest acidity)

explanation :

pH values of all :

battery acid pH = 1.0

vomit pH = 2.0

soda pop pH = 2.5

orange juice pH = 3.5

coffee pH = 5.0

milik pH = 6.5

pH value is lesser acidity is more . high pH indicate lesser acidic nature