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3 years ago

7

Select the correct answer. Which property is typical of a covalent compound?

2 answers:

Norma-Jean [14]3 years ago

7 0

E - they exist only as gases and liquids

Vesnalui [34]3 years ago

3 0

Answer:

it is b

Explanation:

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According to the Punnett square: B represents the dominant gene for blue feathers and b represents the recessive gene for red fe

Semmy [17]

Answer: 25%

Explanation: bb are don't have a dominant trait to overmask it

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4 years ago

What would be the composition and ph of an ideal buffer prepared from lactic acid (ch3chohco2h), where the hydrogen atom highlig

Mashutka [201]

Answer:

$P_H =2.86$

$c=1.4\times 10^{-4}$

Explanation:

first write the equilibrium equaion ,

$C_3H_6O_3$ ⇄ $C_3H_5O_3^{-} +H^{+}$

assuming degree of dissociation $\alpha$ =1/10;

and initial concentraion of $C_3H_6O_3$ =c;

At equlibrium ;

concentration of $C_3H_6O_3 = c-c\alpha$

$[C_3H_5O_3^{-} ]= c\alpha$

$[H^{+}] = c\alpha$

$K_a = \frac{c\alpha \times c\alpha}{c-c\alpha}$

$\alpha$ is very small so $1-\alpha$ can be neglected

and equation is;

$K_a = {c\alpha \times \alpha}$

$[H^{+}] = c\alpha$ = $\frac{K_a}{\alpha}$

$P_H =- log[H^{+} ]$

$P_H =-logK_a + log\alpha$

$K_a =1.38\times10^{-4}$

$\alpha = \frac{1}{10}$

$P_H= 3.86-1$

$P_H =2.86$

composiion ;

$c=\frac{1}{\alpha} \times [H^{+}]$

$[H^{+}] =antilog(-P_H)$

$[H^{+} ] =0.0014$

$c=0.0014\times \frac{1}{10}$

$c=1.4\times 10^{-4}$

6 0

3 years ago

Is the process of making a glass of lemonade a physical or chemical change?? Explain.

Darya [45]

Physical I think

Explanation:

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3 years ago

Read 2 more answers

How does the sun get so hot.

torisob [31]

Answer: Because it is a giant fire ball

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3 years ago

if .00327 g of gas dissolves in .376 L of water at 876 torr what quantity of this gas will dissolve 759 torr ?

MAXImum [283]

Answer:- Solubility of the gas at 759 torr is 0.00753 g/L.

Solution:- From given data, 0.00327 g of gas is soluble in 0.376 L of water at 876 torr.

Solubility of gas at 876 torr pressure is = 0.00327g/0.376L = 0.00869 g/L

Solubility of gases is directly proportional to the pressure. It means, grater is the pressure, more is the solubility of gases.

So, 0.00869/876 = X/759

Where, X is the solubility of the gas at 759 torr.

X = 0.00869(759)/876

X = 0.00753 g/L

4 0

4 years ago