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yKpoI14uk [10]
3 years ago
7

3. Which of the following is not true for atoms? (4 points) They combine to form elements and molecules. They contain negatively

charged electrons. They are the building blocks of matter. They are made up of elements.
Chemistry
1 answer:
Taya2010 [7]3 years ago
7 0
<h3><u>Answer;</u></h3>

They are made up of elements.

<h3><u>Explanation;</u></h3>
  • An atom is the smallest particle of matter that still retains the property of the element.
  • Two or more atoms combine to form elements or compounds. Elements are formed by two or more similar atoms, while compounds are formed by two or more different elements.
  • Atoms are made up of subatomic particles; protons, electrons and neutrons. Electrons are negatively charged, protons are positively charged while neutrons have no charge.
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<u>Answer:</u> The number of bottles that will be needed are 6

<u>Explanation:</u>

We are given:

Amount of solution, the intern is asked to prepare = 3 L = 3000 mL   (Conversion factor:  1 L = 1000 mL)

Strength of solution needed = 30 % (w/v)

This means that in 100 mL of solution, the solute present is 30 grams

So, in 3000 mL of solution, the solute present will be = \frac{30}{100}\times 3000=900g

Active ingredient present in 1 bottle = 8 ounce of 70 % (w/v)

<u>Conversion factor used:</u> 1 ounce = 29.57 mL

So, 8ounce\times \frac{29.57mL}{1ounce}=236.6mL

Amount of active ingredient present in 1 bottle = 236.6\times \frac{70}{100}=165.6g

To calculate the number of bottles, we need to divide the total amount of solution needed by the amount of active ingredient present in 1 bottle, we get:

\text{Number of bottles}=\frac{\text{Amount of solution to prepare}}{\text{Amount of active ingredient in 1 bottle}}

Putting values in above equation, we get:

\text{Number of bottles}=\frac{900g}{165.6g}\\\\\text{Number of bottles}=5.43\approx 6

Hence, the number of bottles that will be needed are 6

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