Paint thinners, gasoline, and glue are common forms of __________

What is the mechanism of action of potassium permanganate as disinfectant ?

san4es73 [151]

Answer:

When applied to your skin, potassium permanganate kills germs by releasing oxygen when it meets compounds in your skin. It also acts as an astringent, which is a drying agent. Some of the conditions that potassium permanganate can help treat include: Infected eczema.

8 0

3 years ago

A 25.0-g sample of ice at -6.5oC is removed from the freezer and allowed to warm until it melts. Given the data below, select al

alukav5142 [94]

Answer:

B, D

Explanation:

The strategy here is to realize that the ice will be taken from -6.5 ºC to OºC where it will melt.

Lets call q₁ the heat required to bring the ice to 0ºc, q₂ the heat required to bring the phase change from solid to liquid.

q₁ is calculated from the expression

q₁ = s x m x ΔT where m is the mass, s the specific heat of ice ( 2.09 J/gºC ) and ΔT the change in temperature.

q₂ the fusion enthalpy change is calculated from the expression:

q₂ = C x ΔT

where C is the specific heat for the phase change , in this case named AH given in kJ/mol.

We are given all the data needed to calculate q₁, q₂ and qtotal ( q₁ + q₂ )

q₁ = 25.0 g x ( 2.09 J/gºC) x ( 0 - ( -6.5 ºC ) )

q₁ = 339.6 J = 0.339 kJ

q₂ = (25 g/ 18 g/mol) x 6.02 kJ/mol = 1.39 x 6.02 kJ = 8.36 kJ

qtotal = 0.339 kJ + 8.36 kJ = 8.70 kJ

with these calculations, we can now proceed to answer the question:

(a) False AH is theheat capacity for the melting.

(b) True as we determined above

(c) False we only have one phase change, from solid (ice) to liquid

(d) True as calculated above

(e) False as determined in our calculations

7 0

3 years ago

Number 14? Please :)

LUCKY_DIMON [66]

i believe the answer is because asphalt conducts heat better

5 0

3 years ago

Determine the theoretical yield of P2O5, when 3.07 g of P reacts with 6.09 g of oxygen in the following chemical equation

saveliy_v [14]

Answer: 14.2 grams

Explanation:-

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

given mass of phosphorous (P) = 3.07 g

Molar mass of phosphorous (P) = 31 g/mol

Putting in the values we get:

$\text{Number of moles of phosphorous}=\frac{3.07g}{31g/mol}=0.1moles$

given mass of oxygen $O_2$ = 6.09 g

Molar mass of oxygen $O_2$ = 32 g/mol

Putting in the values we get:

$\text{Number of moles of oxygen}=\frac{6.09g}{32g/mol}=0.2moles$

According to stoichiometry:

$4P+5O_2\rightarrow 2P_2O_5$

4 moles of phosphorous combine with 5 moles of oxygen

Thus 0.1 moles of phosphorous combine with = $\frac{5}{4}\times 0.1=0.125$ moles of oxygen

Thus phosphorous acts as limiting reagent as it limits the formation of product and oxygen is the excess reagent.

4 moles of phosphorous gives= 2 moles of $P_2O_5$

Thus 0.1 moles of phosphorous gives = $\frac{2}{4}\times 0.1=0.05$ moles of $P_2O_5$

mass of $P_2O_5=moles\times {\text {Molar mass}}=0.05\times 284=14.2g$

Thus the theoretical yield of $P_2O_5$ is 14.2 grams.

5 0

3 years ago

What pollutants can contribute to acid precipitation and how are these pollutants generated?

damaskus [11]

Answer:

I don't know I don't know about question but I can try to find it

Explanation:

I don't know about question but I can try to find it

4 0

3 years ago

Paint thinners, gasoline, and glue are common forms of ___________