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Whitepunk [10]
3 years ago
12

What gives the gem amethyst its purplish color?

Chemistry
2 answers:
Aleks [24]3 years ago
6 0
Answer will be B:Iron
Triss [41]3 years ago
3 0

Structure. Amethyst is a purple variety of quartz (SiO2) and owes its violet color to irradiation, iron impurities (in some cases in conjunction with transition element impurities), and the presence of trace elements, which result in complex crystal lattice substitutions.

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How are elements grouped according to the number of valence electrons in their outermost levels?
melisa1 [442]

Answer:

I think so this is the answer

8 0
3 years ago
2. The Food and Drug Administration (FDA) mandates that all vinegar sold in the United States must have a minimum concentration
Scilla [17]

Answer:

The minimum molarity of acetic acid in vinegar according to given standards is 0.6660 mol/L.

Explanation:

4% acetic acid by mass means that 4 gram of acetic acid in 100 g solution.

Given that density of the vinegar is same is that of water =  1 g/mL

Mass of the vinegar solution = 100 g

Volume of the vinegar solution = V

Density=\frac{Mass}{Volume}

1 g/mL=\frac{100 g}{V}

V = 100 mL = 0.1 L

Moles of acetic acid =\frac{4 g}{60.052 g/mol}=0.0666 mol

Molarity=\frac{\text{Moles of solute}}{\text{Volume of solution(L)}}

M=\frac{0.0666 mol}{0.1 L}=0.6660 mol/L

The minimum molarity of acetic acid in vinegar according to given standards is 0.6660 mol/L.

4 0
3 years ago
Which of the following transfers carbon from the nonliving environment to the living environment?
ludmilkaskok [199]
Decomposing because it was being eaten to be decomposed into particles.<span />
5 0
3 years ago
Read 2 more answers
Temperature is an example of a categorical variable a quantitative variable either a quantitative or categorical variable neithe
ludmilkaskok [199]

Answer: Temperature is an example of a quantitative variable

Explanation:

A quantitative variable is defined as :

  • A variable that can assume a numerical value .
  • It can be ordered with respect to either magnitude or dimensions.
  • It is further classified into two types : interval scale and ratio scale.

Temperature comes under interval scale , because interval scale has no zero point.

For example : A 0° C Celsius does not interpret that there is no temperature.

Therefore , Temperature is an example of a quantitative variable.

Hence, the correct answer is "quantitative variable"

5 0
3 years ago
Which is a fossil fuel?<br> O A. Coal<br> O B. Biomass<br> O C. Geothermal<br> O D. Nuclear
creativ13 [48]

Answer:

coal

Explanation:

fossil fuels are formed by natural process.

3 0
2 years ago
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