Below are the answers:
1.b - cfcs
2.d - <span>carbon dioxide,smog,acid rain. </span>
3.a - <span> laws and treaties that limit or ban pollutants</span>
4.c - <span>burning leaves and brush
</span>
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Explanation:
When Henri Becquerel investigated the newly discovered X-rays in 1896, it led to studies of how uranium salts are affected by light. By accident, he discovered that uranium salts spontaneously emit a penetrating radiation that can be registered on a photographic plate.
Parts-per-million is a form of concentration that is confusing to some. It is often used for aqueous solutions at low concentrations because, as you state in your question, in dilute solutions the density of water has not been affected ie. is still 1.00 g/mL.
parts per million is defined as micrograms of solute per milliliter of solution. This doesn't inherently make sense since micrograms are on the millionths scale, but mL are on the thousandth scale, so it would seem to be millionth per thousandth--Not so! Since the 1.00 mL of water weighs 1.00 g, ug/mL converts, for dilute aqueous solutions, to ug/g, which now makes sense as parts per million. So, from the information given, the calculation is quite simple:
0.0036 g Cl * 10^6 ug/1 g = 3600 ug Cl
1.00 L * 1000 mL/1L = 1000 mL
Concentration of Cl- in solution in ppm:
3600 ug Cl- / 1000 mL = 3.6 ppm Cl-
Answer:
The answer to the question is
The star’s approximate radial velocity is 68.52 km/s
Explanation:
To solve the
The formula is
where
= velocity of the star
λ = Star's spectrum wavelength = 656.45 nm
= Rest wavelength = 656.30 nm
c = Speed of light = 299 792 458 m / s
Therefore we have
or = 68518.7699 m/s or 68.52 km/s
Answer:
Matter always takes space (or has volume).