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2 years ago

15

A compound has a low melting point, is not soluble in water, and doesn't conduct electricity when in solution. The sample is mos

t likely:
A:
VO2
В:
CF4
C:
MgBr2
D:
not enough information

1 answer:

Fudgin [204]2 years ago

6 0

Answer: cf4

Explanation: trust me

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Count the atoms<br> 2Ca(H2PO4)3<br> How many O atoms are in the above equation?

Helga [31]

I think they are 3 atoms

7 0

2 years ago

Which of the following samples would be the most compressible?

Andrej [43]

Answer:

CO2 (g)

Explanation:

In solids the interatomic or intermolecular space is least . It is most pronounced in gases . That is why inter molecular or interatomic attraction is least in gases . That is why gas flows .

Hence , when we try to compress a gas , due to inter molecular space , it is most likely to get compressed . It will be least compressed when we try to compress a solid because of lack of intermolecular space .

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2 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

Which compound type is formed when two atoms share two electrons?

Pie

Covalent compounds
All the best

5 0

3 years ago

Which of the following sets of empirícal formula, molar mass, and molecular formula is correct?

skad [1K]

<em>Answer:</em>

The option C is correct.
CH4N, 90g, C3H12N3.

<em>Explanation:</em>

<em>Option C:</em>

The molecular formula is C3H12N3.

If we take ratio 3:12:3 that will be equal to 1:4:1 so its empirical formula will be CH4N.
The molar mass of molecular formula = (12×3) + (1×12) +( 14×3) = 98 g

<em>Option A :</em>

In option A , molecular and empirical formula are both correct but molar mass is not valid. It should be 169 acc. to molecular formula.

<em>Option B:</em>

In option B, molecular formual is not valid.
It should be as C6H16O2

4 0

3 years ago