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Usimov [2.4K]
3 years ago
13

How do glow sticks glow?

Chemistry
1 answer:
Mice21 [21]3 years ago
7 0
A glow stick contains two chemicals and a suitable dye (sensitizer, or fluorophor). This creates an exothermic reaction. The chemicals inside the plastic tube are a mixture of the dye and diphenyl oxalate. The chemical in the glass vial is hydrogen peroxide.
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Metal plating is done by passing current through a metal solution. For example, an item can become gold plated by attaching the
Norma-Jean [14]

Answer:

9.18g

Explanation:

Step 1: Write the reduction half-reaction

Au³⁺(aq) + 3 e⁻ ⇒ Au(s)

Step 2: Calculate the mass of gold is produced when 15.0A of current are passed through a gold solution for 15.0min

We will use the following relationships:

  • 1 min = 60 s
  • 1 A = 1 C/s
  • 1 mole of electrons has a charge of 96486 C (Faraday's constant).
  • 1 mole of Au is produced when 3 moles of electrons circulate.
  • The molar mass of Au is 196.97 g/mol.

The mass of gold produced is:

15.0 min \times \frac{60s}{1 min} \times \frac{15.0C}{1s} \times \frac{1 mol e^{-} }{96486C} \times \frac{1molAu}{3 mol e^{-} } \times \frac{196.97gAu}{1molAu} = 9.18gAu

3 0
3 years ago
Why is grass green? Also why is the sky blue???
lara31 [8.8K]
<span>Like many plants, most species of grass produce a bright pigment called chlorophyll. Chlorophyll absorbs blue light (high energy, short wavelengths) and red light (low energy, longer wavelengths) well, but mostly reflects green light, which accounts for your lawn's color.

</span>sky<span> is </span>blue<span> because molecules in the air scatter </span>blue<span> light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colors because the </span>blue<span> light has been scattered out and away from the line of sight.
</span>
Hope this Helped!
5 0
3 years ago
Read 2 more answers
Answer number six please
soldier1979 [14.2K]

the second one

forth one

and sixth one


7 0
3 years ago
Read 2 more answers
POINTS FOR HELP!!!!!
Fudgin [204]
MgSO4, CO2, AlCl3 are the answer
3 0
3 years ago
The volume of solution in a test tube is measured to be 0.0067 liter. Which digits in the measurement are significant figures?
puteri [66]

<u>Given data:</u>

Volume of solution measured = 0.0067 L

<u>To determine:</u>

The number of significant figures

<u>Explanation:</u>

Significant figures are the number of digits that accurately describe a measured value.

As per the rules:

All non-zero digits are significant

Leading zero's i.e. the zero's after a decimal which comes before a non-zero digit are not significant

Hence in the given value 0.0067, there are 2 significant figures (6 &7)


8 0
4 years ago
Read 2 more answers
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