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Rina8888 [55]
3 years ago
10

What metirial is this

Chemistry
2 answers:
BaLLatris [955]3 years ago
7 0
The pic is very unclear sorry
aleksandrvk [35]3 years ago
3 0
I'm not sure based on the picture, but if this is chewing gum I think it would be the material of chicle. (Sorry if this didn't help)
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A gas with a volume of 8 L at a temperature of 473K is switched to a new container with a temperature of 350K. If the pressure r
Digiron [165]

Answer:

The new  volume is 5.92 L,  which is approximately 6 L

Explanation:

As the gas temperature increases, the molecules move faster and take less time to reach the walls of the container. This means that the number of crashes per unit of time will be greater. That is, there will be an increase (for an instant) in the pressure inside the container and the volume will increase.

So Charles's Law is one of the gas laws that relates the volume and temperature of a certain amount of gas at constant pressure and says that:

  • If the temperature increases the volume increases
  • If the temperature decreases the volume decreases

Mathematically this is expressed by:

\frac{V}{T}=k

When you want to study two different states, an initial and a final one of a gas, this law is expressed by:

\frac{V1}{T1} =\frac{V2}{T2}

In this case:

  • V1: 8 L
  • T1: 473 K
  • V2: ?
  • T2: 350 K

Replacing:

\frac{8 L}{473K} =\frac{V2}{350K}

Solving:

V2=350K*\frac{8L}{473K}

V2=5.92 L

<u><em>The new  volume is 5.92 L,  which is approximately 6 L</em></u>

5 0
3 years ago
Part a a solution is made by mixing 9.00 mmol (millimoles) of ha and 3.00 mmol of the strong base. what is the resulting ph? exp
Debora [2.8K]

Assuming that the reaction is unimolecular on both reactant and product sides such that:

 

HA  +  OH-   -->  A-  +  H2O

 

Therefore the amount of A- left is:

mmol HA = 9.00 - 3.00 = 6.00 <span>
mmol A- = 3.00 

pKa = - log Ka = 5.25 

</span>

<span>Calculating for pH:
pH = 5.25 + log 3.00/6.00</span>

<span>pH = 4.95 </span>
7 0
3 years ago
What is the mass, in grams, of one mole of any substance known as? (please help!)
kotegsom [21]
B.




Explanation: Molar mass: the mass in grams of one mole of any substance (elements or compounds). Also known as atomic mass, atomic weight, molecular weight (MW), and formula weight (FW), but these terms can be misleading. 1 mole 12C = 6.022 x 1023 atoms 12C = 12 g 12C. 12C is defined to be exactly 12 g.
5 0
2 years ago
Calculate the enthalpy change, ∆H in kJ, for the reaction H2O(s) → H2(g) + 1/2O2(g). Use the following information: : +279.9 kJ
Delvig [45]

Answer:

+ 291.9 kJ

Solution:

The equation given is as;

H₂O ₍s₎ → H₂ ₍g₎ + 1/2 O₂ ₍g₎ ΔH = ?

First, as we know the heat of formation of H₂O ₍l₎ is,

H₂ ₍g₎ + 1/2 O₂ ₍g₎ → H₂O ₍l₎ ΔH = - 285.9 kJ

Now, reversing the equation will reverse the sign of heat as,

H₂O ₍l₎ → H₂ ₍g₎ + 1/2 O₂ ₍g₎ ΔH = + 285.9 kJ

Also, we know that,

H₂O ₍s₎ → H₂O ₍l) ΔH = + 6.0 kJ

Now, adding last two equations,

H₂O ₍l₎ → H₂ ₍g₎ + 1/2 O₂ ₍g₎ ΔH = + 285.9 kJ

H₂O ₍s₎ → H₂O ₍l) ΔH = + 6.0 kJ

-----------------------------------------------------------------------------

H₂O ₍s₎ → H₂ ₍g₎ + 1/2 O₂ ₍g₎ ΔH = + 291.9 kJ

4 0
3 years ago
What are the coefficients that would correctly balance this equation? ____Zn + ____K₂CrO₄→ ____K + ____ZnCrO₄
dybincka [34]

Answer:

Zn + K2CrO4 -----> 2K + ZnCrO4

Explanation:

6 0
2 years ago
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