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2 years ago

52. In the following reaction, which are the Spectator ions? *

Chemistry

1 answer:

maks197457 [2]2 years ago

5 0

Answer:

nitrate and sodium are spectator ions .The reactions that form an aqueous solution are often a spectator ions.

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Iridium has only two naturally occurring isotopes. Ir-191 with arelative mass of 190.96058 and Ir-193 with a relative mass of192

OLEGan [10]

Answer: The fractional abundance of Ir-191 is 0.372

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

Let the fractional abundance of Ir-191 be x and that of Ir-193 isotope be (1-x)

For isotope 1 (Ir-191):

Mass of isotope 1 = 190.96058 amu

Fractional abundance of Ir-191 = x

For isotope 1 (Ir-193):

Mass of isotope 1 = 192.96292 amu

Fractional abundance of Ir-193 = (1 - x)

Average atomic mass of iridium = 192.217 amu

Putting values in equation 1, we get:

$192.217=[(190.96058\times x)+(192.96292\times (1-x))]\\\\x=0.372$

Hence, the fractional abundance of Ir-191 is 0.372

6 0

3 years ago

A 5.0-gram sample of Fe(s) is to be placed in 100. milliliters of HCl(aq). Which changes will result in the fastest rate of reac

sveta [45]

The answer is increasing the surface area of Fe(s) and increasing the concentration of HCl(aq).

the rate of reaction can be increased if the interaction between the reactants in better. by increasing the surface area of a solid, such as Fe, you make more possible each molecule of Fe to interact with HCl. Also, by increasing the concentration of HCl, it mean there is more molecule of HCl to interact with Fe.

6 0

3 years ago

A space probe on the surface of mars sends a radio signal back to earth,a distance of 7.19 ×10⁷ km. Radio travel at the speed of

lys-0071 [83]

Answer:

240 seconds

Explanation:

Data Given:

Distance Radio travel to earth = 7.19 ×10⁷ km

Speed of this radio signal = 3.00 ×10⁸ m/s

Solution:

First convert Km to m

1 km = 1000 m

7.19 ×10⁷ km = 7.19 ×10⁷ x 1000 = 7.19 × 10¹⁰m

Formula used to calculate time

Speed (S) = distance (d) / time (t)

rearrange above equation for time

time (t) = distance (d) / Speed (S) . . . . . . . . .(1)

Put values in equation 1

time (t) = 7.19 × 10¹⁰/ 3.00 ×10⁸ m/s

time (t) = 240 s

So 240 seconds it take for the signal to reach the earth

6 0

3 years ago

Which of the following statements regarding spontaneous changes is false?A. Spontaneity is favored when heat is released.B. Spon

ArbitrLikvidat [17]

Answer: Option (E) is the correct answer.

Explanation:

A spontaneous reaction is defined as the process which tends to occur on its own. And, a non-spontaneous reaction is defined as a process for the completion of which we have to provide certain conditions.

For example, ice melting at $25^{o}C$ is spontaneous primarily due to the increase in molecular disorder (dispersal of matter). Also, melting of ice is taking place on its own without any external force.

It is not necessary that all exothermic reactions will be exothermic in nature.

Thus, we can conclude that the statement all exothermic reactions are spontaneous, is false.

4 0

4 years ago

Study the solutions in the glasses. Put the solutions in order from concentrated to dilute.

Svetach [21]

A. 1,2,3. The solutions are getting lighter meaning the concentration is decreasing. Its most likely that water was added to dilute the solutions.

8 0

3 years ago