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katrin2010 [14]
3 years ago
14

How do you change your name on your brainly profile

Computers and Technology
2 answers:
deff fn [24]3 years ago
7 0

Answer:

first you click on ''edit profile'' then click on ''Preferences'' then where it says first name type what u want ur name to be

Explanation:

i hope this helped if not im sorry

Lady_Fox [76]3 years ago
4 0
I do not think that you can :/
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What is the rate constant at 25.0 ∘c based on the data collected for trial b?
Alecsey [184]
<h2><u>Answer: </u></h2>

acetone + I2 + HCl ---> iodated acetone  

Equation:

rate = k * [acetone]^x * [I2]^y * [HCl]^z  

Once we know x, y, z, we can plug in any of the trials A->D and determine k  NOTE: We can't use run E because temperature has an effect on rate. E was run at a different temperature.

The first thing to note is that do NOT have concentrations. We have volumes at a given molarity.  

Table:  

.001M I2.. ..050M HCl.. .1.0M acetone.. .water.. temp..time.. total vol  

.. ....mL.. ... ... .. .mL.. .. ... .. .. mL.. .. .. .. ..mL.. ..°C.. .sec.. .. .. .L  

A.. ...5.. .. .. .. .. ..10.. .. .. .. .. ..10.. .. .. .. ..25.. .. .25.. .130.. .. 0.05  

B.. ..10.. .. .. ... .. 10.. .. .. ... .. .10.. .. .. ... ..20.. . .25.... 249.. ..0.05  

C.. . 10.. .. .. .. .. .20.. .. .. .... .. 10.. .. ... ... .10... ..25.. ..128... .0.05  

D.. . 10.. ... .. ... ..10.. .. ... .. ... 20.. .. .. .. .. 10.. .. 25.. ..131.. ..0.05  

E.. ..10.. ... .. ... ..10.. ... ... ... ..10.. ... .. ... .20.. .. 42.8.. .38.. ..0.05  

We can translate that into molarity in solution using this formula. (molarity pure ingredient * mL used / 1000 / total volume in liters)  

 

.. .. ..I2.. .... HCl.. acetone.. temp.. ..rxn time  

.. .. ..M.. .. ...M.. .... .M.. .... ..°C.. .. .. sec  

A.. 0.0001.. 0.01..... 0.2.. .... .25... .... .130  

B.. 0.0002.. 0.01.. .. 0.2.. .. .. 25.. .. .. .249  

C.. 0.0002.. 0.02.. .. 0.2.. .. .. 25.. .. .. .128  

D.. 0.0002.. 0.01.. .. 0.4.. .. . .25.. ... ...131  

E.. 0.0002.. 0.01.. .. 0.2.. . ....42.8.. .. .. 38  

From runs B and D, we can see that rate dropped by half .

As [I2] and [HCl] were held constant and [acetone] was doubled.  

This means x=-1 in this equation  

Rate = k * [acetone]⁻¹ * [I2]^y * [HCl]^z  

Rate = k * [I2]^y * [HCl]^z  

From runs A and B  

[I2] doubles  

[HCl] remains the same  

[acetone] remains the same  

rate doubles   as [I2] doubles, rate doubles  

y = 1   rate = k * [acetone]⁻¹ * [I2]¹ * [HCl]^z  

And from runs B and C, we can see that  , As [HC] doubles, (all else equal) the rate halves.

Z = -1  

Rate = k * [I2] / ([acetone] * [HCl])  

Rearranging  

k = rate * [acetone] * [HCl] / [I2]  

From any experimental run (A-D), we can calculate k.

using A to calc k... ..k = 2600 M²/sec  

using B to calc k... . k = 2490 M²/sec  

using C to calc k... . k = 2560 M²/sec  

using D to calc k... . k = 2620 M²/sec  

NOTE.. the problem statement said to use the data from run B to calc k.

Hence Final Answer:

k = 2490 M²/sec

4 0
3 years ago
Design a circuit with the following criteria. Assume existence of +5V power supply. Draw your circuit and show your work. i. Inp
tresset_1 [31]

Answer:

see attached

Vin -5V- +5V

Input current : 500 x 10^-6 A

V_r: 0V 5V

I_r: 1 mA

Explanation:

Step 1: Circuit Designing: you have to address the question what is your proposed circuit going to do (its function).

Step 2: Decide on circuit components that can address each such circuit functions.

Step 3: Decide on the operational specification for the circuit: voltages, currents, frequencies etc.

Step 4: Simulate your circuit to confirm if it works as expected with simulation software such as Multisim.

4 0
3 years ago
What's the best definition of financial literacy?
8090 [49]

Answer:

defines personal financial literacy as "the ability to use knowledge and skills to manage financial resources effectively for a lifetime of financial well-being.\

Explanation: thats it

5 0
3 years ago
The cost of renewable energies has increased over the last decade.<br><br> True<br> False
Rudik [331]

Answer:

I believe the answer is True

Explanation:

Hope that helps!

7 0
2 years ago
Use the drop-down menus to complete statements about safe and blocked senders lists.
Ierofanga [76]

Answer:

it already has an answer and it's right so i don't see the point to needing to answer this

6 0
3 years ago
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