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Alisiya [41]
3 years ago
10

What terms refers to the process by which astronomers study distant objects by dissecting examining the spectrum of light an obj

ect reflects
Cosmology
Isotropic
Singularity
Spectroscopy
Chemistry
1 answer:
mart [117]3 years ago
3 0
Spectroscopy because it talks about the study of spectrum of light.
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How do you think the amount of a material affects its tendency to sink or float? <br> ASAP
Ksivusya [100]

Answer:

it dependes on the material

Explanation:

what is the material

3 0
3 years ago
The coin of silver (ag) having 8.5 grams weight.calculate the number of moles of silver in coin
AfilCa [17]

0.0788 will be the number of moles of silver in coin.

<h3><u>How to find the number of moles?</u></h3>

A mole is the mass of a material made up of the same number of fundamental components. Atoms in a 12 gram example are identical to 12C. Depending on the material, the fundamental units may be molecules, atoms, or formula units.

A mole fraction shows how many chemical elements are present. The value of 6.023 x 10²³ is equivalent to one mole of any material (Avagadro's number). It can be used to quantify the chemical reaction's byproducts. The symbol for the unit is mol.

The number of moles formula is denoted by the following expression:

Number of moles = Mass of substance/mass of one mole

To view more about number of moles, refer to:

brainly.com/question/14080043

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6 0
2 years ago
Convert a density of 7.2 g/ml into the unit kg/L
aivan3 [116]

Unit conversion is a multi-step process, in which division or multiplication by a numeral factor is involved.

Density = 7.2 g/mL    (given)

Since, 1 g = 0.001 kg and

1 mL = 0.001 L

Now, converting 7.2 g/mL to kg/L:

7.2 \frac{g}{mL}\times \frac{1 kg}{1000 g}\times \frac{1000 mL}{1 L}

= 7.2 kg/L.

Hence, density is 7.2 kg/L.

6 0
3 years ago
What is the quantity of carbon-14 in a bone after 17,190 years if the initial mass of C-14 is 0.300 grams and the half-life is 5
Licemer1 [7]

Answer:

A. 0.038 g.

Explanation:

  • The decay of carbon-14 is a first order reaction.
  • The rate constant of the reaction (k) in a first order reaction = ln (2)/half-life = 0.693/(5730 year) = 1.21 x 10⁻⁴ year⁻¹.

<u><em>The integration law of a first order reaction is:</em></u>

<em>kt = ln [Ao]/[A]</em>

k is the rate constant = 1.21 x 10⁻⁴ year⁻¹.

t is the time = 17,190 years.

[Ao] is the initial concentration of carbon-14 = 0.300 g.

[A] is the remaining concentration of carbon-14 = ??? g.

∵ kt = ln [Ao]/[A]

∴ (1.21 x 10⁻⁴ year⁻¹)(17,190 years) = ln (0.300 g)/[A]

2.08 =  ln (0.300 g)/[A]

Taking exponential for both sides:

8.0 = (0.300 g)/[A]

<em>∴ [A] = 0.0375 g ≅ 0.038 g</em>

4 0
3 years ago
What is the maximum amount of kcl that can dissolve in 200 g of water? (the solubility of kcl is 34 g / 100 g h 2o at 20°c.) 680
muminat
The answer is 68 g
hope this helps!!
5 0
3 years ago
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