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3 years ago

Can someone one help me drop your sc I need help in science!

Chemistry

1 answer:

Ilia_Sergeevich [38]3 years ago

4 0

Answer:

What is the question?

Explanation:

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The four stages of tehniclogical design

NeX [460]

The steps are: identify a problem, research the problem, generate possible solutions, select the best solution, create a model, test the model, refine and retest the model as needed, and then communicate the final solution.

Hope this helps! :3

6 0

4 years ago

A chemist prepares a solution of iron(III) bromide (FeBr3) by measuring out 41.1 mg of FeBr3 into a 50. mL volumetric flask and

allsm [11]

Answer: The molarity of $Br^-$ anions in the chemist's solution is 0.0084 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

$Molarity=\frac{n\times 1000}{V_s}$

where,

n = moles of solute

$V_s$ = volume of solution in ml

moles of $FeBr_3$ = $\frac{\text {given mass}}{\text {Molar mass}}=\frac{0.0411g}{295.6g/mol}=0.00014mol$

Now put all the given values in the formula of molality, we get

$Molarity=\frac{0.00014\times 1000}{50}=0.0028$

As 1 mole of $FeBr_3$ gives = 3 moles of $Br^-$

0.0028 moles of $FeBr_3$ gives = $\frac{3}{1}\times 0.0028=0.0084 moles$ of $Br^-$

Thus the molarity of $Br^-$ anions in the chemist's solution is 0.0084 M

5 0

3 years ago

KNO3(s) --> K+(aq) + NO3-(aq)This reaction was carried out in a Styrofoam insulated calorimeter and the following data were r

nataly862011 [7]

Answer:

Equation correctly showing the heat of solution

$KNO_3(s)+35.2 kJ \rightarrow K^+(aq) + NO_{3}^-(aq)$

Explanation:

Mass of aqueous solution = m = 100 g

Specific heat of solution = c = 4.18 J/gºC

Change in temperature = $\Delta T=T_f-T_i$

ΔT = 21.6ºC - 30.0ºC = -8.4ºC

Heat lost by the solution = Q

$Q = mc\Delta T$

$Q=100 g\times 4.18 J/g^oC\times (-8.4^oC)$

Q = -3,511.2 J ≈ -3.51 kJ

Heat absorbed by potassium nitrate when solution in formed; Q'

Q' = -Q = 3.51 kJ

Moles of potassium nitrate , n= $\frac{10.1 g}{101 g/mol}=0.1 mol$

$KNO_3(s)\rightarrow K^+(aq) + NO_{3}^-(aq)$

The heat of solution =

$\frac{Q'}{n}=\frac{3.5112 kJ}{0.1 mol}=35.1 kJ/mol$

So, the equation correctly showing the heat of solution

$KNO_3(s)+35.2 kJ \rightarrow K^+(aq) + NO_{3}^-(aq)$

4 0

4 years ago

Which unit is not a measurement of volume? cm L ml Cm^3

Mademuasel [1]

Centimeters are units of length.

8 0

4 years ago

Name at least four of the six processes of life that cells control.

wel

For the answer to answer above, O - Ordered structure 
H - maintain Homeostasis with the environment 
S - respond to Stimuli from the environment 
A - Adaptation to the environment 
R - ability to Reproduce 
G - Grow and develop over the period of their life 
E - transform Energy from the environment 

Remember, all life is made from cells (this is not a "process" that living things carry out, but rather a property of life itself).

7 0

4 years ago