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2 years ago

Can someone please help me with this quickly thank you

Chemistry

1 answer:

ale4655 [162]2 years ago

8 0

It’s the 2nd one kno3

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What chemical changes happen at school

kykrilka [37]

Burning, cooking

Explanation:

Chemical changes that happens in school are:

Cooking of meals

Burning of wastes

Chemical reactions in laboratories

Rusting of iron used in construction

A chemical change is a change that produces new kinds of substances.
These changes are usually accompanied by energy and mass changes.
Most of such changes are not reversible.

Chemical changes are driven by change in chemical properties of matter.

In a school, iron components might begin to rust. This is a chemical change.

learn more:

Chemical change brainly.com/question/9388643

#learnwithBrainly

8 0

2 years ago

For the reaction at 298 K, 2NO2(g) N2O4(g) the values of ΔH° and ΔS° are -58.03 kJ and -176.6 J/K, respectively. Calculate the v

Ierofanga [76]

Answer:

$\Delta G^o=-5.4032 kJ$

The temperature for $\Delta G^o=0[/tex is [tex]T=328.6 K$

Explanation:

The three thermodinamic properties (enthalpy, entropy and Gibbs's energy) are linked in the following formula:

$\Delta G^o=\Delta H^o + T*\Delta S^o$

Where:

$\Delta G^o$ is Gibbs's energy in kJ

$\Delta H^o$ is the enthalpy in kJ

$\Delta S^o$ is the entropy in kJ/K

$T$ is the temperature in K

Solving:

$\Delta G^o=-58.03 kJ - 298K*-0.1766 kJ/K$

$\Delta G^o=-5.4032 kJ$

For $\Delta G^o=0$ :

$0=\Delta H^o - T*\Delta S^o$

$\Delta H^o= T*\Delta S^o$

$T=\frac{\Delta H^o}{\Delta S^o}$

$T=\frac{-58.03 kJ}{-0.1766 kJ/K}$

$T=328.6 K$

3 0

3 years ago

Read 2 more answers

What would be the effect on this reaction of increasing the temperature?

Ainat [17]

Answer: D

Explanation: I got it wrong on my test :( and got this answer as correct.

6 0

2 years ago

Read 2 more answers

What is the molarity of 6 moles (mol) of NaCl dissolved in 2 L of water?

Mama L [17]

Answer:

C: $\frac{6 mol}{2 L}$

Explanation:

we can use the molarity equation

$M = \frac{mol}{L}$

so to find M we plug in what we know, which is 6 moles of NaCl and 2 L of water, which gives us:

$\frac{6 mol}{2 L}$

8 0

2 years ago

How does changing the temperature affect the chemical reaction?

tiny-mole [99]

The correct answer is C) Raising the temperature increases reaction rate by increasing the energy of the reacting atoms/ions/molecules and increases the number of collisions.

8 0

3 years ago