3 years ago

Giving out 56 points! What's the top color of a rainbow?

Chemistry

2 answers:

lys-0071 [83]3 years ago

8 0

❤️Hello!❤️ Red! Then orange, yellow, green, blue, and purple! Hope this helps! ↪️ Autumn ↩️

Anvisha [2.4K]3 years ago

7 0

If you look at a rainbow, the answer is Red. Also, Violet is on the bottom end.

<h2><u><em>Hope this helps</em></u></h2>

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2. A block of material has a volume of 2 m3. It has a mass of 1 × 104 kg. Calculate the density of the material sample and expre

maks197457 [2]

Density = mass / volume

D = 1 x 10⁴ / 2

D = 5000 kg/m³ in g/cm³:

1 kg/m³ ---------------- 0.001 g/cm³
5000 kg/m³ ----------- ??

5000 x 0.001 / 1 => 5.0 g/cm³

hope this helps!

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3 years ago

2. Which test for iron(II) ions is conclusive

krok68 [10]

Answer:

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Explanation:

The addition of K 3 Fe(CN) 6 to a solution causes the formation of a deep blue precipitate which indicates that iron(II) ions are present.

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2 years ago

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If element A has an ionic charge of +2 and element B has an ionic charge of -3, what will be the formula for the compound create

Softa [21]

A3B2 because the oxidation numbers are the same as ionic charge just switch symbol and number. Then use the cross cross method and you get A3B2.

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3 years ago

Earth is unique because it is the _____.

astraxan [27]

Answer:

B. The only planet to support life.

Explanation:

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3 years ago

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1) What mass of Na2CO3 is required to make 50cc of its seminormal solution?

love history [14]

Answer:

$m=1.325gNa_2CO_3$

Explanation:

Hello,

In this case, by considering the given seminormal solution, we infer it is a 0.5-N solution which means that we can obtain the equivalent grams as shown below for the 55 cc (0.055 L) volume:

$eq-g=0.5eq-g/L*0.050L=0.025eq-g$

Next, since sodium carbonate has two sodium ions with a +1 oxidation state each, we can obtain the moles:

$mol=0.025eq-gNa_2CO_3*\frac{1molNa_2CO_3}{2eq-gNa_2CO_3}\\ \\mol=0.0125molNa_2CO_3$

Finally, the mass is computed by using its molar mass (106 g/mol)

$m=0.0125molNa_2CO_3*\frac{106gNa_2CO_3}{1molNa_2CO_3} \\\\m=1.325gNa_2CO_3$

Regards.

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3 years ago