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3 years ago

12

Which of the following cannotbe considered a single phase? a heterogeneous mixture a pure solid a homogeneous mixture a pure liq

uid

1 answer:

MrRa [10]3 years ago

4 0

A heterogeneous mixture cannot be considered a single phase

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What is the frequency of a 6.14 x 10^4 m wave

andrew11 [14]

From the information give, I'm going to assume the wave is in a vacuum...

You use the equation: f= $\frac{C}{Wavelength}$ where c is the constant for speed of light ( $3.00 x 10^{8}$

so f= $\frac{3.00x10^{8}}{6.14x10^{4}}$

f= 4.89 x $10^{3}$ Hz (approximately)

7 0

3 years ago

1,4-Pentadiene has a AHhydro = -254 kJ/mol while trans-1,3-pentadiene has a AHhydra = -226 kJ/mol. Explain this difference in he

julsineya [31]

Answer:

trans-1,3-pentadiene is more stable than 1,4-pentadiene due to presence of a conjugated double bond.

Explanation:

Here, $\Delta H_{hydro}=H(hydrogenated pdt.)-H(diene)$

H(hydrogenated pdt.) is same for both 1,4-pentadiene and 1,3-pentadiene as they both produce pentane after hydrogenation

H(diene) depends on stability of diene.

More stable a diene, lesser will be it's H(diene) value (more neagtive).

trans-1,3-pentadiene is more stable than 1,4-pentadiene due to presence of a conjugated double bond.

Hence, $\Delta H_{hydro}$ is higher (less negative) for trans-1,3-pentadiene

5 0

4 years ago

Name the following ionic compounds: (a) K2Cr2O7, (b) Li2C2O4, (c) CuNO3.

Elis [28]

Answer :

(a) The name of $K_2Cr_2O_7$ is, potassium dichromate.

(b) The name of $Li_2C_2O_4$ is, lithium oxalate.

(c) The name of $CuNO_3$ is, copper nitrate.

Explanation:

Ionic compound : It is a type of compound that is made up of the ions of the two different elements in which one element is a metal and another element is a non-metal.

(a) $K_2Cr_2O_7$

The given compound $K_2Cr_2O_7$ is an ionic compound. It is made up of two different ions which are potassium ion $(K^+)$ and dichromate ion $(Cr_2O_7^{2-})$ .

So, the name of $K_2Cr_2O_7$ is, potassium dichromate.

(b) $Li_2C_2O_4$

The given compound $Li_2C_2O_4$ is an ionic compound. It is made up of two different ions which are lithium ion $(Li^+)$ and oxalate ion $(C_2O_4^{2-})$ .

So, the name of $Li_2C_2O_4$ is, lithium oxalate.

(c) $CuNO_3$

The given compound $CuNO_3$ is an ionic compound. It is made up of two different ions which are copper ion $(Cu^+)$ and nitrate ion $(NO_3^{-})$ .

So, the name of $CuNO_3$ is, copper nitrate.

4 0

3 years ago

What precipitate forms when silver nitrate and potassium chromate solutions are mixed? Explain.

weeeeeb [17]

Answer: a. $Ag_2CrO_4( s)$

Explanation:

$2AgNO_3(aq)+K_2CrO_4(aq)\rightarrow Ag_2CrO_4(s)+2KNO_3(aq)$

When silver nitrate $AgNO_3$ combines with potassium chromate $K_2CrO_4(aq)$ ,they undergo double displacement reaction in which exchange of ions take place.

The products formed are silver chromate $Ag_2CrO_4$ which is insoluble in water and thus formed as precipitate and potassium nitrate $KNO_3(aq)$ is soluble in water.

3 0

4 years ago

is it true heat is energy transfer that reduces the amount of kinetic energy of a substances particle

Cloud [144]

Answer:

false

Explanation:

heat expands and makes the particles faster.

4 0

3 years ago