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AleksandrR [38]
2 years ago
9

What property of lasers causes coherent light to be emitted?

Chemistry
1 answer:
Andrew [12]2 years ago
4 0
The question is a.different intensities

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If the mass of a material is 78 grams and the volume of the material is 23 cm3, what would the density of the material be?
Paraphin [41]

Density = mass / volume

Density = (78g) / (23cm^3)

Density = 3.4g/cm^3

8 0
3 years ago
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The graph shows the number of beans eaten by a random zocco. How many light red kidney beans were eaten on Day 7? How many dark
Tems11 [23]

Answer:

day 7   50  and day 8  40

Explanation:

3 0
3 years ago
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What is the molarity of a solution that contains 2 moles of solute in 4 liters of solution?
Nitella [24]
The simple formula is C = n/V
n = mols
C = Concentration or Molarity
V = Volume in Liters.

n = 2
V = 4
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C = 0.5 mol/Litre

8 0
3 years ago
A 100.0 ml sample of 0.10 m ca(oh)2 is titrated with 0.10 m hbr. determine the ph of the solution after the addition of 400.0 ml
WINSTONCH [101]
The balanced equation for the reaction is as follows;
Ca(OH)₂ + 2HBr --> CaBr₂ + 2H₂O
stoichiometry of Ca(OH)₂ to HBr is 1:2
number of Ca(OH)₂ moles reacted - 0.10 mol/L x 0.1000 L = 0.010 mol
Number of HBr moles added - 0.10 mol/L x 0.4000 = 0.040 mol 
1 mol of Ca(OH)₂ needs 2 mol of HBr for neutralisation
therefore 0.010 mol of Ca(OH)₂  needs - 0.010 x 2 = 0.020 mol of HBr to be neutralised
but 0.040 mol of HBr has been added therefore number of moles of HBr in excess - 0.040 - 0.020 = 0.020 mol 
then pH of the medium can be calculated using the excess H⁺ ions
HBr is a strong acid therefore complete ionization
[HBr] = [H⁺]
[H⁺] = 0.020 mol / (100.0 + 400.0 mL)
      = 0.020 mol / 0.5 L 
      = 0.040 mol/L
pH = -log[H⁺] 
pH = - log [0.040 M]
pH = 1.40
pH of the medium is 1.40
8 0
3 years ago
What is the rate of change in velocity
luda_lava [24]
The rate of change in velocity<span> is called acceleration.</span>
3 0
3 years ago
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