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VladimirAG [237]
4 years ago
6

Which is evidence that a chemical reaction has occurred? A) a phase change occurs B) a new gas is observed in the form of bubble

s C) red and yellow paint mixing to make orange paint D) the temperature of the substance remains constant
Chemistry
1 answer:
sweet [91]4 years ago
7 0

Answer:

I think A) a phase change occurs

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Answer:

B

Explanation:

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valentinak56 [21]

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4 years ago
Draw the structure of (z)-3-bromo-6-methyl-2-heptene. be sure the stereochemistry is drawn clearly.
Anna007 [38]

Explanation: In IUPAC, E-Z convention is given for describing the cis - trans notation to the isomers. According to CIP rule, the groups on the doubly bonded carbon atoms are given priorities based on the the atomic masses of first connected atom.

If the highest priority groups are on the same side, it is known as Z-form and if the highest priority groups are on opposite side, it is known as E-form.

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The structure is provided in the image below.

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3 years ago
What is the concentration (in ppm) of Mn7+ in a 0.00300 M KMnO4 solution?  Note:  for dilute aqueous solutions, 1 ppm = 1 mg/L.
aleksklad [387]

We know that there is 1 mole of Mn for every 1 mole of KMnO4, therefore the molarity of Mn is similar with KMnO4:

Mn = 0.00300 M

Molar mass of Mn is 54.94 g / mol. Molarity (M) is moles / L, therefore:

Mn = (0.00300 moles / L) * (54.94 g / mol) * (1000 mg / g)

<span>Mn = 164.82 mg / L = 164.82 ppm</span>

3 0
3 years ago
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