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4 years ago

Scientists noticed that the ozone layer was thinning. What was occurring at the same time?

1 answer:

7 0

At the same time there is increased usage of chlorofluorocarbon [CFC].
CFC are halogenated compounds which have ability to destroy the ozone layer. When ultraviolet ray strike CFC in the atmosphere, it breaks the forces holding the molecule together and yield a chlorine atom. The chlorine atom then react with the ozone layer, breaking it apart and destroying it.<span />

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Which of these is a chemical property of a substance?

valentinak56 [21]

Color, the other answers arent changing the substance into something different

3 0

4 years ago

Did I balance this correctly?

garik1379 [7]

Yes you balanced it correctly : CH₃CH₂CH₃ ₍g₎ + 5O₂ ₍g₎ -------> 3CO₂ ₍g₎ + 4H₂O ₍g₎

A hack to checking if its correct when they give you the structural formula of one of the species (CH₃CH₂CH₃) is to convert it to the molecular formula and if you get the same answer then it's correct.

So CH₃CH₂CH₃ is the struct-formula for the molec-formula C₃H₈

C₃H₈ + 5O₂ --------> 3 CO₂ + 4H₂O (which means your correct =D)

6 0

3 years ago

An argon ion laser emits light of wavelength of 488 nm. (a) Calculate the frequency of the light. (b) Suppose a pulse of light f

Alex787 [66]

Answer:

A) 6.15×10^14 per sec

B)2.5 sec

Explanation:

Wavelength of light = 488 nm

speed of light = 3×10^8 m/s

therefore, frequency of light $\nu=\frac{c}{\lambda}$

⇒ $\nu=\frac{3\times10^8}{488\times10^{-9}}$

⇒ν= 6.15×10^14 per sec

b) distance between moon and earth = 3.8×10^5 km.

= 3.8×10^8 m

light travel from earth moon and back to earth

therefore, distance traveled= 2× 3.8×10^8 m = 7.6×10^8 m

therefore time= distance/speed

⇒ time= $\frac{7.6\times10^8}{3\times10^8}$

= 2.5 sec

So, for a round trip time required is 2.5 sec.

5 0

3 years ago

Substance being reduced?

lana [24]

Answer:

$Ni^{2+}$

Explanation:

From the equation attached , $Ni^{2+}$ is reduced. This is because reduction is equivalent to decrease in the oxidation number. In the equation , The oxidation number of Ni is reduced from +2 to 0.

NB, The oxidation number of a neutral atom is zero

4 0

4 years ago

Methanol and ethanol are said to be miscible in one another. What does this tell you?

sasho [114]

Answer:

That they are miscible in one another

4 0

3 years ago