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o-na [289]
2 years ago
6

By studying a star's spectrum, scientists can work out its chemical make-up and temperature. What instrument do astronomers' use

to carry out this task?
A) space probe
B) spectroscope
C) radio telescope
D) light telescope
Chemistry
2 answers:
vredina [299]2 years ago
8 0
The answer is -
B) Spectroscope
Bess [88]2 years ago
5 0
B is the answer you are looking for
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A 4.236 g sample of a hydrocarbon is combusted to give 3.810 g of h2o and 13.96 g of co2. what is the empirical formula of the c
miss Akunina [59]
<span>Given mass: 3.810 g of h2o and 13.96 g of co2. Mass of CO2 : 13.96 g moles of CO2 : 0.317 moles / 44.0098 moles of C : 0.317 moles Mass of water = 3.81 g moles of water = 0.212 moles / 18.015 moles of H = 0.423 moles X2 Hence the molar ratio C : H is 0.317 : 0.423 = 1.000 : 1.334 Multiplying by 3 on both ratios we get: 3.000 : 4.003 Therefore the empirical formula is C3H4</span>
3 0
3 years ago
Explain how an element that does not react easily with other elements can be useful.
BaLLatris [955]
Elements that are unreactive can be useful for 'isolating' other volatile elements. For example, an element may be highly reactive with oxygen, so keeping it in air is not a safe option. In such cases, it may be useful to have a noble gas to store the element safely and ensure its stability. It may also have a purpose in experiments where it may act as a controlling agent or a container for the other reactions. 
5 0
3 years ago
Please help me answer the question above in the picture.
Zanzabum

Answer:

C

Explanation:

Non-polar and symmetrical accurately describes the molecular polarity and charge distribution in CO2.

7 0
2 years ago
Ase/xual reproduction is not a good option for a large population because of what?<br><br> /
Olenka [21]

Answer:

because it would be harder to do and there would be less diversity and adaptions

3 0
2 years ago
A chemist needs to create a series of standard Cu2+(aq) solutions for an absorbance experiment. For the first standard, he uses
morpeh [17]

Answer:

0.01 M

Explanation:

The chemist is performing a serial dilution in order tyo obtain the calibration curve for the instrument.

First we must obtain the concentration of the solution in the 250ml flask from

C1V1 = C2V2

Where;

C1 = concentration of the stock solution

V1 = volume of the stock solution

C2 = concentration of the diluted solution

V2= volume of the diluted solution

2.61 × 10 = C2 × 250

C2 = 2.61 × 10/250

C2 = 0.1 M

Hence for solution in 100ml flask;

0.1 × 10 = C2 × 100

C2 = 0.1 × 10/100

C2 = 0.01 M

6 0
3 years ago
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