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andrey2020 [161]
3 years ago
12

Do wind up clocks need batteries? -like the non wired ones.

Chemistry
1 answer:
Sphinxa [80]3 years ago
6 0
No, why? Cause if you're winding up the clock it's basically doing what it needs to do. So there's no need for batteries.. I hope my sad sentence make sense :p
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Which color of light bends the least when passing through a prism?
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3 years ago
A laboratory technician combined sodium hydroxide with excess iron(II) nitrate. A reaction took place according to this chemical
Whitepunk [10]

 The initial  mass  of sodium hydroxide  is  3.3 g (answer C)

 <u><em>calculation</em></u>

Step 1 : find the  moles of iron (ii) hydroxide (  Fe(OH)₂

moles =  mass÷  molar mass

from periodic table the  molar mass of Fe(OH)₂  = 56 + [16 +1]2  = 90 g/mol

moles  is therefore = 3.70 g÷ 90 g/mol = 0.041 moles

Step 2:  use the mole ratio to  calculate the moles of  sodium hydroxide (NaOH)

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therefore the moles of NaOH = 0.041 x 2 = 0.082 moles

Step 3: find  mass of NaOH

mass = moles x molar mass

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mass  = 0.082  moles x 40 g/mol = 3.3 g ( answer C)


8 0
3 years ago
The temperature of a star is 6000K and its luminosity is 1000. Which type of star is it?
Lorico [155]

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SHOW WORK
horsena [70]
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The third question requires you to solve for the weight of sodium (Na) and weight of Chloride (Cl) from the calculated moles of each element Na, and Cl.

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6 0
3 years ago
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