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4 years ago

Safety glasses are worn in the lab for

2 answers:

4 0

Safety glasses should be worn any time you are doing an experiment, especially one that involves chemicals or chemical reactions. They prevent chemicals or other materials from getting on or in your eye, and can prevent anything from mild discomfort to permanent blindness.

Some pairs of safety glasses have magnifying glasses on them, similar to bifocals. They can be used to more carefully examine something in an experiment.

alexdok [17]4 years ago

4 0

Protecting your eyes from chemicals

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For a particular reaction, Δ H ∘ = 55.4 kJ ΔH∘=55.4 kJ and Δ S ∘ = 94.1 J/K. ΔS∘=94.1 J/K. Assuming these values change very lit

nadezda [96]

Answer:

The temperature at which the reaction changes from non-spontaneous to spontaneous is 588.735 K

Explanation:

The spontaneity of a reaction is determined by the change in Gibbs Free Energy, $\Delta G^{0}$ .

$\Delta G^{0} =\Delta H^{0} -T\Delta S^{0}$

If $\Delta G^{0}$ is greater than zero, then a reaction is feasible.

If $\Delta G^{0}$ is less than zero, then a reaction is not feasible.

To determine the temperature at which the reaction changes from non-spontaneous to spontaneous, we should equate the $\Delta G^{0}$ to zero.

We take $\Delta G^{0}=0$ as the limiting condition.

$T=\frac{\Delta H^{0}}{\Delta S^{0}}=\frac{55.4\times10^{3}}{94.1}=588.735K$

Therefore, the temperature is: 588.735K

7 0

4 years ago

The pOH of a solution is

Volgvan

The pOH of a solution is the negative logarithm of the hydroxide-ion concentration.

4 0

3 years ago

How many moles are in 9.571x10^2 mega grams of nickel (iii) sulfate?

Leni [432]

First convert mega grams to grams

(9.57x10^2)*(10^6)=957100000 grams

Then find the molar mass of nickel sulphate

Nickel Ni 3+ and sulphate SO4 2+

So formula= Ni2(SO4)3

So mr = (59*2) + (32*3) + (16*12)

= 406gmol-1

Moles = mass/mr

957100000/406

=2357389.163 moles

8 0

4 years ago

What defines the mass number of an isotope

vekshin1

The mass number of an isotope is determined by the number of neutrons in the isotope plus the number of protons.
For instance Carbon-13 is an isotope of carbon. The "13" is the mass number of the isotope.
So, in this example, 13 = #protons + #neutrons

8 0

4 years ago

Why is only one molecule of N2 needed to produce 2 molecules of NH3?

pav-90 [236]

D, N2 is comprised of two atoms of nitrogen bonded together

7 0

3 years ago