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olga55 [171]
3 years ago
5

Why is it important for lens makers to know then density of the glass they are using??

Chemistry
2 answers:
vlada-n [284]3 years ago
6 0
The density of a glass helps determine the weight of the optical assembly and, along with lens diameter, becomes critical for weight sensitive applications. 
natta225 [31]3 years ago
4 0
Because the density of the glass depends on the wait and what it looks like through the lens.
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Can swords shatter from cold temperatures
sp2606 [1]
Depends on how the sword is made, what materials are used and temperature used but yes they can shatter.

When molecules cool down they stop vibrating and moving as much and so they "shrink" and the metal of the sword becomes brittle. sometimes they shrink at different phases which cause tension in the sword if this tension is strong enough it can cause the metallic bonds to break causing the sword to shatter.

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3 years ago
Why most molecules survive for long periods at room temperature​
Vesnalui [34]

Explanation:

Most molecules survive for long periods of time at room temperature because at room temperature, they are stable. The room temperature is the temperature between 20-25°C where human beings are the most comfortable.

At the room temperature, most molecules are in their natural physical state without any reason to rearrange their bonds and a times be destroyed. The energy at room temperature is just perfect for bond stability.

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4 years ago
Describe and tell the difference between voltage and a current.
nevsk [136]
Current is the rate at which electric charge flows past a point in a circuit. In other words, current is the rate of flow of electric charge. Voltage, also called electromotive force, is the potential difference in charge between two points in an electrical field. ... Current is the effect (voltage being the cause).
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4 years ago
How does acid react to water mixed with clorine eyedrops
frosja888 [35]

Answer: Chlorine gas is produced when sulfuric acid is mixed with chlorine bleach.

Explanation:  This reaction is a function of the change in pH of the solution from alkaline to acidic combined with the strong oxidant properties of hypochlorous acid.

<h2><u><em>Make sure to reword this in your words!!!</em></u></h2>
4 0
2 years ago
If Aluminum (Al) and Sulfur (S) form an ionic compound, what is the charge on each ion and the formula for the compound?
FrozenT [24]

Answer:

Al³⁺, S²⁻; Al₂S₃

Explanation:

Al is a metal, so it loses its three valence electrons in a reaction to form Al³⁺ ions.

S is a nonmetal. It needs two more electrons to complete its octet, so it tends to form S²⁻ ions.

We can use the criss-cross method to work out the formula of the compound.  

The steps are

  1. Write the symbols of the anion and cation.
  2. Criss-cross the numbers of the charges to become the subscripts of the other ion.
  3. Write the formula with the new subscripts.
  4. Divide the subscripts by their highest common factor.
  5. Omit all subscripts that are 1.

When we use this method with Al³⁺ and S²⁻, the formula for the compound formed becomes Al₂S₃ .

7 0
3 years ago
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