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Andrej [43]
3 years ago
12

The water behind a dam has potential energy that can be converted to kinetic energy to turn a turbine

Chemistry
2 answers:
Alona [7]3 years ago
7 0
It's a 50\50% but I am going to say true because of hydroelectric power

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Savatey [412]3 years ago
6 0
This is true because the water would have gravitational potential energy that is caused by the water being held back by the dam and the water wanting to flow down.

This can be converted into kinetic energy when given the chance to, such as having a turbine on the dam.

Hope this helps! :)
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The correct mass of a block is 28.0 grams. A chemist measures the block
Sati [7]

Answer:  NOT accurate, but precise.  

[translation:  You screwed up, but did it in style].

Explanation:

The average mass measurement is 41.95g.  Compared to the actual value of 28.0 grams, the measurement is NOT accurate.  

The standard deviation for the data is 0.112.  Dependiong on your definition of precision, this looks relatively good.  I would go for precise.  

3 0
3 years ago
80g of sodium hydroxide reacts with excess sulfuric acid to produce 142g of sodium sulfate. What mass of sodium hydroxide would
Ostrovityanka [42]

Answer:

Mass of sodium hydroxide needed  = 28.2 g

Explanation:

Given data:

Mass of sodium hydroxide = 80 g

Mass of sodium sulfate produced = 142 g

Mass of sodium hydroxide needed = ?

Mass of sodium sulfate produced = 50 g

Solution:

Mass of sodium sulfate produced / Mass of sodium hydroxide = Mass of sodium sulfate produced / x

142 g/ 80 g = 50 g / x

x = 50 g × 80 g / 142 g

x =4000 g/ 142

x = 28.2 g

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The numbers in front of the formulas

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It is a combination of Red, Blue and Green wavelengths of light, that is perceived as white.
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