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3 years ago

If Li loses an electron to another atom, why is it written Li^+1 (with a +1)

Chemistry

1 answer:

Alecsey [184]3 years ago

5 0

Answer:

The +1 in the superscript indicates that each particle carries a charge of $+1$ .

Explanation:

Both electrons and protons carry electrical charge. However, the charge on electrons is negative, while the charge on protons is positive. Like all other atoms, a lithium atom contains an equal number of electrons and proton. The charge on protons and electrons balance each other. As a result, lithium atoms are neutral (hence no superscript.)

However, when a lithium atom loses an electron, it will contain more protons than electrons. There won't be enough negative charge to balance the positive charge. This particle will become an ion with a positive charge (a cation.) The number 1 in the superscript +1 indicates the size of this charge.

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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.

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3 years ago

What is the SI base unit for length?

sp2606 [1]

The SI base unit for length is meter.

In order to make smaller measurements, you can use the centi-, milli-, micro-, etc. prefixes.

When you want to reference larger measurements, you can use the kilo-, mega-, giga- and prefixes such as those.

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3 years ago

Boiling refers to which phase change?

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2 years ago

Most _______ rocks form under conditions found a few kilometers under earths surface

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3 years ago

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