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3 years ago

PLS HELP!!! I NEED THIS NOW!!!

Chemistry

2 answers:

Grace [21]3 years ago

7 0

It’s 42!! Let me know if this helps!

vesna_86 [32]3 years ago

6 0

Answer:

42 hope it helped !!!!!!!!!!!!

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What does this ruler read as ? I need some help !!

Ludmilka [50]

Answer: 41 7/10

Explanation: The mark is on the seventh out of ten marks

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3 years ago

You are a pre-K teacher, starting a new year with a class of four- and five-year-olds. You have begun to notice that during clas

masha68 [24]

you let josh do his work on an electronic devices

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4 years ago

What is the minimum (non-zero) thickness of a benzene (n = 1.501) thin film that will result in constructive interference when v

ad-work [718]

Explanation:

At each reflecting surface (benzene and glass) there will be 180 degree phase change.

Now, for constructive interference the optical path in benzene is $\lambda$ .

Formula to calculate thickness of a benzene thin film is as follows.

Optical path length through benzene ( $\lambda$ ) = $2 \times n \times d$

Hence, substituting the given values into the above formula as follows.

Optical path length through benzene = $2 \times n \times d$

d = $\frac{\text{Optical path length through benzene}}{2 \times n}$

= $\frac{\lambda}{2 \times n}$

= $\frac{615 \times 10^{-9}}{2 \times 1.501}$ (as 1 nm = $10^{-9}m$

= 204.9 m

Thus, we can conclude that minimum thickness of benzene is 204.9 m.

4 0

3 years ago

Drag the types of electromagnetic waves to place them in order of increasing wavelength.

patriot [66]

From shortest wavelength to longest wavelength: ultraviolet ,visible light ,infrared

3 0

4 years ago

Read 2 more answers

Please help I have a test

natka813 [3]

Answer:

Pink- Lithium Salts or Lithium Nitrate (NO3), Yellow- Sodium Salts or Sodium Nitrate (NO3)

Explanation:

These chemicals (Sr, Ba, Cu, Ca, Na, Mg) are used because they create the colors for the firework. As you can see, the chemicals Nitrogen (N) and Oxygen (O) are combined with the color chemicals to make them combust.

The chart below explains the colorants used in firework creations:

<u>Color</u>= <u>Compound</u>

Red= strontium salts, lithium salts

lithium carbonate, Li2CO3 = red

strontium carbonate, SrCO3 = bright red

Orange= calcium salts

calcium chloride, CaCl2

calcium sulfate, CaSO4·xH2O, where x = 0,2,3,5

Gold= incandescence of iron (with carbon), charcoal, or lampblack

Yellow= sodium compounds

sodium nitrate, NaNO3

cryolite, Na3AlF6

Electric White= white-hot metal, such as magnesium or aluminum

barium oxide, BaO

Green= barium compounds + chlorine producer

barium chloride, BaCl+ = bright green

Blue= copper compounds + chlorine producer

copper acetoarsenite (Paris Green), Cu3As2O3Cu(C2H3O2)2 = blue

copper (I) chloride, CuCl = turquoise blue

Purple= mixture of strontium (red) and copper (blue) compounds

Silver= burning aluminum, titanium, or magnesium powder or flakes

I hope this answers the question you have! If not, I apologize.

8 0

3 years ago