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3 years ago

Approximately, how many days does it take for an insect to grow from an egg to an adult?

Chemistry

2 answers:

vlabodo [156]3 years ago

8 0

D.)14 to 16 days ... at least for a fly with is an insect also
plz mark branliest

mihalych1998 [28]3 years ago

8 0

The answer is C.16-18 days.
your welcome!

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A 5.00L reaction vessel is filled with 1.00mol of H2, 1.00mol of I2, and 2.50mol of HI. If equilibrium constant for the reaction

sladkih [1.3K]

Answer:

[I₂] ; [H₂] = 0.067 mol/L

[HI] = 0.765 mol/L

Explanation:

This is the reaction:

I₂(g) + H₂(g) ⇄ 2HI (g)

Initially 1mol 1mol 2.5mol

I have the initially amount of each gas at first. Some amount (x), has reacted during the reaction.

I₂(g) + H₂(g) ⇄ 2HI (g)

React x x 2x

In the equilibrium I have to subtract, what I had initially and the amount that has reacted, and then, as I had 2.5 mol of HI at the begining, I have to sum, the amount of the reaction. As I have to find out the concentrations, I have to /5L, which is the volume of the vessel.

Eq. (1-x)/5 (1-x)/5 (2.5+2x)/5

Let's make the expression for Kc

Kc = [HI]² / ( [I₂] . [H₂])

129 = ( (2.5+2x) /5 )² / ( (1-x) /5) . ( (1-x) /5) )

129 = ( (2.5+2x) /5 )² / ( (1-x) /5)²

129 = (2.5+2x)² / 25 / (1-x)² / 25

129 = (2.5 + 2x)² / (1-x)²

129 = 2.5² + 2 . 2.5 .2x + 4x² / 1 - 2x + x²

129 (1 - 2x + x²) = 2.5² + 2 . 2.5 .2x + 4x²

129 - 258x + 129x² = 6.25 + 10x + 4x²

129 - 6.25 -258x -10x + 129x²-4x² = 0

122.75 - 268x + 125x² = 0 (a quadratic function)

a = 125

b = -268

c = 122.75

(-b +- (√b² - 4ac)) / 2a

x₁ = 1.48

x₂ = 0.66

We take the x₂ value, cause the x₁, will get a negative concentration and that is impossible.

[I₂] = ( 1-0.66 ) /5 = 0.067

[H₂] = ( 1-0.66 ) /5 = 0.067

[HI] = (2.5+ 2. 0.66) /5 = 0.765

5 0

4 years ago

How do i find a ionic formula? <br><br>for example Ca2+ & S2-

jeka94

Example #1 write the chemical formula for Calcium Oxide

Step 1

-Find the Atomic symbol of the metal and non-metal on the periodic table

CaO

Step 2

Find the charges for Calcium and Oxygen

which are Ca 2+ and O 2-

Step 3

Balance out the charges

They are already balanced out

Here´s the chemical formula for Calcium Oxide

CaO

Example 2 write the chemical formula for Aluminum Oxide

Step 1

-Find the Atomic symbol of the metal and non-metal on the periodic table

Step 2

Find the charges for Aluminum and Oxygen

Which are Al 3+ and O 2-

Step 3

Balance out the charges

You need 2 Aluminum and 3 Oxygen to balance the charges

Al 3+ O 2-

= 6 + O 2-

= 6-

Step 4

If you need more then one element to balance out the charges you identify that by using subscripts

Heres your chemical formula for Aluminum Oxide

$Al_{2} O_{3}$

8 0

3 years ago

What is the titration

Inga [223]

Titration is the slow edition of one solution of unknown concentration to a noun volume up another solution of unknown concentration until the reaction reaches neutralization which is often indicated by a color change

7 0

3 years ago

Help please. 15.0 moles of gas are in a 3.00L tank at 23.4∘C . Calculate the difference in pressure between methane and an ideal

CaHeK987 [17]

Using PV=nRT or the ideal gas equation, we substitute n= 15.0 moles of gas, V= 3.00L, R equal to 0.0821 L atm/ mol K and T= 296.55 K and get P equal to 121.73 atm. The Van der waals equation is (P + n^2a/V^2)*(V-nb) = nRT. Substituting a=2.300L2⋅atm/mol2 and b=0.0430 L/mol, P is equal to 97.57 atm. The difference is <span>121.73 atm- 97.57 atm equal to 24.16 atm.</span>

3 0

3 years ago

Tin, Sn, is a soft white metal. It has a low melting point compared with other metals. Tin is widely used as a coating for cans

Bas_tet [7]

Answer:

Explanation:

6 0

3 years ago