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3 years ago

As the elements in Period 2 are considered in order from lithium to fluorine, there is an increase in the

1 answer:

3 0

There is an increase in many things, you have to be specific. there is an increase in protons, the ionization energy is increased, the atomic weight, the atomic number

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Levart [38]

Answer:

Explanation:

Friction is a force that opposes motion.

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3 years ago

A mysterious white powder could be powdered sugar (C12H22O11), cocaine (C17H21NO4), codeine (C18H21NO3), norfenefrine (C8H11NO2)

konstantin123 [22]

Answer: norfenefrine $(C_8H_{11}NO_2)$

Explanation:

Depression in freezing point is given by:

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

$\Delta T_f=T_f^0-T_f=(-114.6-(-115.5)^0C=0.9^0C$ = Depression in freezing point

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

$K_f$ = freezing point constant = $1.99^0C/m$

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 (ethanol)= $density\times volume=0.789g/cm^3\times 1.50cm^3=1.18g=1.18\times 10^{-3}kg$

Molar mass of unknown non electrolyte = M g/mol

Mass of unknown non electrolyte added = 82 mg = 0.082 g (1g=1000mg)

$0.9=1\times 1.99\times \frac{0.082g}{M g/mol\times 1.18\times 10^{-3}}kg}$

$M=154g/mol$

The molecular mass of norfenefrine $(C_8H_{11}NO_2)$ is near to 154 and thus the identity of the white powder is norfenefrine .

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3 years ago

Write a balanced equation for the double-replacement precipitation reaction described, using the smallest possible integer coeff

sergey [27]

$CrI_{3}_{(aq)} + 3KOH_{(aq)} --\ \textgreater \ Cr(OH)_{3} _{(s)} +3KI_{(aq)}$

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3 years ago

Please help this is a test you in5 minutes I really need help I’ll give 10 points

kondaur [170]

Answer:

net force is 0

Explanation:

logccccccccccccccccc

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3 years ago

Read 2 more answers

The structure of the compound or molecule help predict the name of the compound. Given the binary molecule HCl, which statement

Snezhnost [94]

Answer:

The two nonmetals indicate that covalent naming rules apply.

Explanation:

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4 years ago