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Oxana [17]
3 years ago
5

Absorbance readings are taken for five standard ferrous (ii) thiocyanate solutions and a beer’s law plot is created with the equ

ation: y = 3.2975x + 0.0021. a ferrous (ii) thiocyanate solution of unknown concentration is found to have an absorbance of 0.31. the cuvette was 1cm wide. what is the unknown concentration according to the above data?
Chemistry
1 answer:
DIA [1.3K]3 years ago
5 0
The Beer's Law plot is a graph of Absorbance data vs Concentration data. The plot is linear which follows the slope-intercept form: y = mx + b, where m is the slope and b is the y-intercept. The y data is the absorbance, and the x data is for the concentration. At the same wavelength, this equation can be used to determine C at a given absorbance. When y = 0.31, then x is

0.31 = <span>3.2975x + 0.0021
Solving for x,
x = 0.0934

Thus, the unknown concentration is 0.0934 mol/L.</span>
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When heating a solution to boiling on a hot plate, start by ___________. Then, turn the heat to ___________to start. If necessar
Aleonysh [2.5K]

Answer:

1. starting and stabilizing the stir function

2. a medium heat

3.turn up the heat setting

Explanation:

A chemical reaction can be defined as a chemical process which typically involves the transformation or rearrangement of the atomic, ionic or molecular structure of an element through the breakdown and formation of chemical bonds to produce a new compound or substance.

Some of the laboratory apparatus (equipment) used for conducting a chemical reaction are conical flask, Bunsen burner, beaker, tongs, crucible, round bottom flask etc.

When heating a solution to boiling on a hot plate, start by starting and stabilizing the stir function. Then, turn the heat to a medium heat to start. If necessary, turn up the heat setting after waiting about ten minutes without seeing boiling.

The safety precautions that must be taken when heating a solution to boiling on a hot plate;

I. A proper inspection of the round bottom flask for cracks, irregularities or any imperfection.

II. Ensure you avoid heating the flask while it is closed.

III. When suspending the flask on a hot plate, you should ensure that you use a clamp for stability.

5 0
3 years ago
In an isolated system:
ipn [44]

Answer:

isolated system (plural isolated systems) (physics) A system that does not interact with its surroundings. Depending on context this may mean that its total energy and/or momentum stay constant.

Explanation:

An isolated system is a thermodynamic system that cannot exchange either energy or matter outside the boundaries of the system. ... The system may be enclosed such that neither energy nor mass may enter or exit.

is there both?

7 0
3 years ago
One of the steps in processing some metals is smelting. what does smelting do for a metal?
vichka [17]
Hey there,
Smelting's main use is to produce a base metal from its ore

Hope this helps :))

~Top
8 0
3 years ago
QUESTION 2
alina1380 [7]

Answer:

A

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Mutualism is A symbiotic relationship between two species in which both partners benefit

8 0
3 years ago
In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be n
artcher [175]
Stoichiomety:

1 moles of C + 1 mol of O2 = 1 mol of CO2

multiply each # of moles times the atomic molar mass of the compund to find the relation is weights

Atomic or molar weights:

C: 12 g/mol
O2: 2 * 16 g/mol = 32 g/mol
CO2 = 12 g/mol + 2* 16 g/mol = 44 g/mol

Stoichiometry:

12 g of C react with 32 g of O2 to produce 44 g of CO2

Then 18 g of C will react with: 18 * 32/ 12 g of Oxygen = 48 g of Oxygen

And the result will be 12 g of C + 48 g of O2 = 60 g of CO2.

You cannot obtain 72 g of CO2 from 18 g of C.

May be they just pretended that you use the law of consrvation of mass and say that you need 72 g - 18g = 54 g. But it violates the proportion of C and O2 in the CO2 and is not possible.
3 0
4 years ago
Read 2 more answers
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