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Leviafan [203]
3 years ago
5

True or false. a wheel and axle are a rotating lever that move around an effort arm?

Chemistry
1 answer:
adelina 88 [10]3 years ago
7 0

Answer:

True

Explanation:

the machine shown in figure 9.9 is called a wheele and axle. It's a form of lever. the effort arm can rotate in a complete circle, which is the center of the axle.

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What percentage of the mass of a carbon-12 atom is
Lynna [10]

Answer:

% of mass of electrons in C = 0.0272

Explanation:

Atomic no. of carbon = 6

So, no. of electron = 6

Mass of an electron = \frac{1}{1836} amu

Mass of 6 electrons = 6 \times \frac{1}{1836} = 0.003268 amu

Mass of C = 12.0107 u

% of mass of electrons in C = \frac{Mass\ of\ all\ electrons}{Mass\ of\ C}\times 100

% of mass of electrons in C = \frac{0.003268}{12.0107}\times 100=0.0272 \%

7 0
3 years ago
What is the effect of an increase in the average kinetic energy of an object
timofeeve [1]
The effect of an increase in the average kinetic energy of an object would be an increase in the temperature of the object.  Temperature is directly proportional to the average kinetic energy of the molecules in the object. Hope this answers the question.
7 0
3 years ago
The compound sodium thiosulfate pentahydrate, Na2S2O3 • 5H2O
Mnenie [13.5K]

The theoretical yield is 204.4 g while the percent yield is 2.57%.

<h3>What is theoretical yield?</h3>

Theoretical yield is the amount of product obtained based on the stoichiometry of the reaction.

S8(s) + 8 Na2SO3(aq) + 40 H2O(l) --->8 Na2S2O3·5 H2O(s)

Number of moles of sulfur =  3.25 g /8(32) = 0.013 moles

Number of moles of sodium sulfite =  13.1 g/126 g/mol = 0.103 moles

Since 1 moles of sulfur reacts with 8 moles of sodium sulfite

0.013 moles reacts with 0.013 moles ×  8 moles /1 mole = 0.104 moles

There is not enough sodium sulfite hence it is the limiting reactant.

1 mole of sodium sulfite yields 8 moles of product

0.103 moles of sodium sulfite yields  0.103 moles × 8 moles /1 mole = 0.824 moles

Mass of product = 0.824 moles × 248 g/mol = 204.4 g

percent yield =  5.26 g /204.4 g × 100/1

= 2.57%

Learn more about percent yield: brainly.com/question/2506978

4 0
2 years ago
How is a universal pH indicator made
Arte-miy333 [17]
Hey!! your answer is -----

universal pH indicator is made up by the combination of several types of indicator.



hope you like ______★
3 0
3 years ago
How many moles are in 2.00g of H2O​
gavmur [86]

n = m/M = 2/18 = 1/9 ~0,1 mol

4 0
2 years ago
Read 2 more answers
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