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2 years ago

8

From where do the gems used in Jewlery come? A. they are mettallic ore B.they are nonmettallic silicates C. they are mettallic m

inerals D. they are non mettallic minerals.

2 answers:

mixas84 [53]2 years ago

6 0

The answer is D, because gems are usually not mettallic

UkoKoshka [18]2 years ago

5 0

Gems used in jewelry come are Non metallic minerals. So it would be D hope this helps!

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anastassius [24]

<h3>Answer:</h3>

0.50 mol SiO₂

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

<u>Math</u>

<u>Pre-Algebra</u>

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Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

<u>Chemistry</u>

<u>Atomic Structure</u>

Reading a Periodic Table
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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

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<u>Step 3: Convert</u>

Set up: $\displaystyle 30 \ g \ SiO_2(\frac{1 \ mol \ SiO_2}{60.09 \ g \ SiO_2})$
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<u>Step 4: Check</u>

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

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2 years ago

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kirza4 [7]

Answer:

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Explanation:

$2HI(g)\rightarrow H_2(g)+I_2(g)
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