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Butoxors [25]
4 years ago
15

Identify five items around your home that use SI units of measurement

Chemistry
1 answer:
geniusboy [140]4 years ago
7 0

Answer & explanation:

SI units are the metric system and the most commonly used measurement system in the world. Some examples of these units you may find around your home are:

Pencil lead size measured in millimeters. (Ex. 0.7mm)

Microwaves, you put your food in for a number of seconds. Any other device used to time things also does this, such as a stopwatch.

A ruler or tape measure will measures in centimeters or meters usually.

A balance or scale may be used to measure mass in grams.

Solid products like antiperspirant, lipstick and other solid makeup products are usually measured in grams.

Solid foods such as butter are usually measured in grams.

Information about the contents of food found on the nutrition facts label are usually measured in grams or milligrams. (Ex. 3g of saturated fat)

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The correct answer is A.

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How many moles of sand (SiO2) are in 30 g of sand?
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<h3>Answer:</h3>

0.50 mol SiO₂

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
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<u>Chemistry</u>

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<h3>Explanation:</h3>

<u>Step 1: Define</u>

30 g SiO₂ (sand)

<u>Step 2: Identify Conversions</u>

Molar Mass of Si - 28.09 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of SiO₂ - 28.09 + 2(16.00) = 60.09 g/mol

<u>Step 3: Convert</u>

  1. Set up:                                \displaystyle 30 \ g \ SiO_2(\frac{1 \ mol \ SiO_2}{60.09 \ g \ SiO_2})
  2. Multiply/Divide:                  \displaystyle 0.499251 \ mol \ SiO_2

<u>Step 4: Check</u>

<em>Follow sig figs and round. We are given 2 sig figs.</em>

0.499251 mol SiO₂ ≈ 0.50 mol SiO₂

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