.Answer:
a fact about copper Copper has a reddish-metallic coloring unique among all the elements. The only other non-silvery metal on the periodic table is gold, which has a yellowish color. The addition of copper to gold is how red gold or rose gold is made sulfur
.Explanation:
sulfur is an essential element for life. It's found in amino acids (cysteine and methionine) and proteins. Sulfur compounds are why onions make you cry, why asparagus gives urine a weird odor, why garlic has a distinctive aroma, and why rotten eggs smell so horrible Mercury Mercury looks pretty, in its shiny, fast-moving liquid form, but don't touch! It can be extremely poisonous to humans. The symbol Hg that mercury is known by comes from its Greek name, hydrargyrum, which means "liquid silver" — to reflect its shiny surface. The element is also known as quicksilver for its mobility.
i can only fit in this much sorry
Answer: A diode laser which emits at a wavelength of 988 nm is in the infra-red portion of electromagnetic spectrum.
Explanation:
Electromagnetic spectrum shows the wavelength or frequency ranges of different electromagnetic radiations. According to this spectrum, the range for infra-red region is from .
Therefor, a diode laser which emits at a wavelength of 988 nm is in the infra-red portion of electromagnetic spectrum.
Answer:
[Cl₂] = 0.1804M
Explanation:
The reaction of Si with Cl₂ is:
Si(s) + 2Cl₂(g) ⇄ SiCl₄(g)
Where equilibrium constant, k, is:
k = 0.30 = [SiCl₄] / [Cl₂]²
<em>Si(s) is not in the equilibrium reaction because pure solids don't take part in the equilibrium.</em>
As initial concentration of SiCl₄ is 0.10mol / 1L = 0.10M, when the equilibrium is established, concentrations are:
[SiCl₄] = 0.10M - X
[Cl₂] = 2X
<em>Where X is the reaction coordinate.</em>
Replacing in k equation:
0.30 = [0.10-X] / [2X]²
0.30 = [0.10-X] / 4X²
1.2X² = 0.10 - X
1.2X² + X - 0.10 = 0
<em>Solving for X:</em>
X = - 0.92M → <em>False solution. There is no negative concentrations.</em>
X = 0.0902M → Right solution.
[Cl₂] = 2×0.0902M = 0.1804M
<h3> [Cl₂] = 0.1804M</h3>
Answer:
15.38 g is the mass for M in the 329 g of sample
Explanation:
Mineral's formula: MS
Our sample weighs 44.9 g
Mass of M: 2.1 g
Our new sample weighs 329 g
We may solve this by a rule of three:
44.9 g of sample contain 2.1 g of M
329 g of sample will contain (329 . 2.1) / 44.9 = 15.38 g
Molarity = moles÷liters
4.53 moles ÷ 2.85 liters = 1.59 M