2 years ago

Identify find a functional groups as indicated

Chemistry

1 answer:

Mumz [18]2 years ago

4 0

Amidogen/aminyl radicle :)

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What does it mean when your teacher wants you to round 143 to two significant figures

zhenek [66]

Answer:The answer is 3...I think

Explanation:

143

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1.43 × 102

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3 years ago

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Vikki [24]

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2 years ago

An area has experienced weathering and erosion for many years. Over time, some rock formations have been left behind forming pea

Anni [7]

Answer:

Explanation:

The rock that is left behind is there because it has resisted the forces of erosion.

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2 years ago

20 Points!! Which of the following is a synthesis reaction? AgNO3+NaCI--> AgCI+NaNO3

lianna [129]

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2 years ago

A certain substance X has a normal freezing point of -6.4 C and a molal freezing point depression constant Kf= 3.96 degrees C.kg

Brut [27]

Answer: $1.0\times 10^2g$

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T_f^0-T_f=(-6.4-(13.6))^0C=7.2^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte like urea)

$K_f$ = freezing point constant = $3.96^0C/m$

m= molality

$\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}}\times \text{weight of solvent in kg}}$

Weight of solvent (X)= 950 g = 0.95 kg

Molar mass of non electrolyte (urea) = 60.06 g/mol

Mass of non electrolyte (urea) added = ?

$7.2=1\times 3.96\times \frac{xg}{60.06 g/mol\times 0.95kg}$

$x=1.0\times 10^2g$

Thus $1.0\times 10^2g$ urea was dissolved.

8 0

3 years ago