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Margaret [11]
3 years ago
8

How has scientists' understanding of the atoms changed over time?

Chemistry
1 answer:
Viefleur [7K]3 years ago
8 0
They discovered more and more objects with different numbers of atoms. which gave them a better understanding
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Which set of three quantum numbers (n, l, ml) corresponds to a 2p orbital?
Sunny_sXe [5.5K]
N=2 (always first number), l=1 (corresponds to p), ml=(-1 to 1)
4 0
3 years ago
A coal-burning power plant produces 500 megawatts of electricity while burning 225,000 kg of coal per hour (almost 250 tons each
kolbaska11 [484]

Answer:

40%

Explanation:

The efficiency of a plant is determined by

eff=\frac{E_{produced}}{E_{in}}

Our produced energy is

500 \ MW

While the input energy can be calculated

E_{in}=number\ of \ coal \ in \ * energy\ per\ coal\ unit\\ =\frac{225000}{3600}coal/ s\ *20\ MJ/coal\\ = 1250\ MW

So, the efficiency of plant is

eff=\frac{500}{1250}}\\ 0.4

or 40% efficient

6 0
3 years ago
Which granulated leukocyte is most likely to be active during a bacterial infection?
77julia77 [94]
It seems that you have missed the necessary options for us to answer this question, so I had to look for it. Anyway, here is the answer. The granulated leukocyte that <span> is most likely to be active during a bacterial infection is the NEUTROPHIL. Hope this answers your question.</span>
7 0
4 years ago
To test Döbereiner’s idea, predict:
Rudik [331]

Answer:

a) Approximate boiling point of HBr = -60.15 °C

b) Approximate boiling point of AsH₃ = -52.25 °C

Explanation:

Döbereiner stated that some elements could be arranged in groups of 3 similar elements ( known as "triads) , and the element of the middle ( elements are ordered with respect to their atomic mass) would have properties between the other 2 ( the average value)

a) In the first case the triad would be the halogen triad ( Cl , Br and I ) . And according to Döbereiner , the boiling point of HBr should be the average of HCl and HI . Therefore

Approximate boiling point of HBr = [(- 84.9°C) + (-35.4°C)]/2 = -60.15 °C

b) Simmilarly for  AsH₃ , PH₃ and SbH₃ , the boiling point of AsH₃ would be

Approximate boiling point of AsH₃ = [(- 87.4°C) + (-17.1°C)]/2 = -52.25 °C

3 0
4 years ago
Rapid oxidation is called _____ or _____. (pick the two answers that apply)
bezimeni [28]
Rapid oxidation is called fusion or combustion.
4 0
3 years ago
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