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stepladder [879]
4 years ago
5

Which statement is NOT true about a scientific law?

Chemistry
1 answer:
jekas [21]4 years ago
6 0

Answer:

A

Explanation:

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Im teaching myself chemistry and need a guide. anyone game?
strojnjashka [21]
Which grade would u like to begin with? I can probably help with grade 9 Intro to Chemistry and Grade 10 Naming elements and compounds. That's all
7 0
3 years ago
Write the structure of a D-aldohexose that gives a meso compound on treatment with NaBH4 in water.
soldier1979 [14.2K]

Explanation:

Meso compounds are optically inactive stereoisomers. Despite of having chiral carbon, they do not show  optical activity because it has a plane of symmetry in its structure itself. It is superposable on its mirror image.

Aldo sugars on reaction which reducing agents such as , NaBH₄ reduces the carbonyl group in the sugar to alcohol and gives corresponding alditol.

<u>The D- aldohexose which on reduction gives a meso alditol are allose and galactose. </u>

<u>The structure is shown in the image below. Thus, in allitol and galactitol formed have internal plane of symmetry which makes the optically inactive.</u>

7 0
3 years ago
The molar mass of glucose is 180.18 grams per mole. Which of the following is the molecular formula of glucose?
Gnom [1K]

C6H12O6 6 carbon 12 hydrogen 6 oxygen

7 0
4 years ago
Read 2 more answers
6. How is energy transferred to the earth?I
qaws [65]

Answer:

Energy is transferred between the earths surface and atmosphere.Energy move place to place

8 0
3 years ago
Drinking water may contain a low concentration of lead ion (Pb2 ) due to corrosion of old lead pipes. The EPA has determined tha
Lynna [10]

Answer:

3.861x10⁻⁹ mol Pb⁺²

Explanation:

We can <u>define ppm as mg of Pb²⁺ per liter of water</u>.

We<u> calculate the mass of lead ion in 100 mL of water</u>:

  • 100.0 mL ⇒ 100.0 / 1000 = 0.100 L
  • 0.100 L * 0.0080 ppm = 8x10⁻⁴ mg Pb⁺²

Now we <u>convert mass of lead to moles</u>, using its molar mass:

  • 8x10⁻⁴ mg ⇒ 8x10⁻⁴ / 1000 = 8x10⁻⁷ g
  • 8x10⁻⁷ g Pb²⁺ ÷ 207.2 g/mol = 3.861x10⁻⁹ mol Pb⁺²
4 0
3 years ago
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