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elixir [45]
2 years ago
9

What is (3.11*10^-5)-(4.21*10^-2)

Chemistry
1 answer:
Reptile [31]2 years ago
3 0

Taking into account the scientific notation, the result of the subtraction is -4.20689×10⁻².

<h3>Scientific notation</h3>

Scientific notation is a quick way to represent a number using powers of base ten, where the numbers are written as a product:

a×10ⁿ

where:

  • a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number.
  • n is an integer, which is called an exponent or an order of magnitude. Represents the number of times the comma is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.

<h3>Subtraction in scientific notation</h3>

When the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found. In this case, the highest exponent is -2.

Then all the values ​​are expressed as a function of the base 10 exponent with the highest exponent. In this case: 3.11×10⁻⁵= 0.00311×10⁻²

Taking the quantities to the same exponent, all you have to do is subtract what was previously called the number "a". In this case:

0.00311×10⁻² - 4.21×10⁻²= (0.00311 - 4.21)×10⁻²= -4.20689×10⁻²

Finally, the result of the subtraction is -4.20689×10⁻².

Learn more about operations in scientific notation:

brainly.com/question/1894247

brainly.com/question/11403716

brainly.com/question/853571

#SPJ1

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Answer:

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Explanation:

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Suppose the volume of  CHCl_3 = P ml

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The equation can now be expressed as:

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From equation (1) ;

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The replace the value of P into equation (2)

1.492 g/mL × P mL + 2.890g/mL × (20 - P) mL = 1.82 g/mL × 20 mL

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∴

Volume of CHCl_3   = 15.31 mL

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Remember, <u>Newton's third law of motion;</u> which says in part that <em>"Every action has an equal and opposite reaction."</em>

Hence, in this case, the fact that the doorbell rang out implies that there was another force that was exerted on it; which is, John's finger pressing the doorbell.

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