3 years ago

A cast fossil is formed when

Chemistry

1 answer:

Liono4ka [1.6K]3 years ago

8 0

The answer is D)
<span>when the remains of a living thing are preserved and turned into rock </span>

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A stock solution of 1.00 M Fe2(SO4)3 is available. How many milliliters are

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Answer:

375 mL

Explanation:

M1*V1 = M2*V2

M1 = 1.00 M

V1 = ?

M2 = 0.750 M

V2 = 0.500 L

1.00 M * V1 = 0.750 M * 0.500 L

V1 = 0.750*0.500/1.00 = 0.375 L = 375 mL

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3 years ago

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3 years ago

You have an aqueous solution of chromium(III) nitrate that you titrate with an aqueous solution of sodium hydroxide. After a cer

barxatty [35]

Answer:

The precipitate was chromium hydroxide, which then reacted with more hydroxide to produce a soluble complex, Cr(OH)4

Explanation:

The following reaction takes place when chromium(III) nitrate reacts with NaOH:

$Cr(NO)_{3}$ +3 NaOH → $Cr(OH)_{3}$ (s)+ $NaNO_{3}$

The precipitate that is formed is chromium hydroxide, $Cr(OH)_{3}$

When more NaOH is added, the precipitate reacts with it which then results in the formation of a soluble complex ion:

$Cr(OH)_{3}$ (s) + $OH^{-}$ (aq) → $Cr(OH)_{4} ^{-}$ (aq)

$Cr(OH)_{4} ^{-}$ is soluble complex ion

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3 years ago

When the pH value of a solution is changed from 2

inna [77]

increases my factor of 10

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3 years ago

**Plz help with this asap who ever replies first with the right answer will get brainlists

Vesna [10]

Answer:first D. 88L

Second A 2*10^24

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280 g =280/70.9 moles, about 4

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2 years ago