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4 years ago

Which one of these salts will form a neutral solution on dissolving in water? KNO2 NaCN NaCl NH4NO3 FeCl3

Chemistry

1 answer:

d1i1m1o1n [39]4 years ago

8 0

Answer:

NaCl

Explanation:

Salts whose ion cannot hydrolyse form neutral solutions; not having alkaline nor acidic properties.

All the other salts would dissociate to form solution or strong acid ad weak bases or vice versa, which then determines their alkalinity or acidity: all except sodium chloride, NaCl.

I hope this explanation was helpful and clear.

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A group of students are studying the magnetic field of Earth. Which of these layers of Earth interact to create Earth's magnetic

mixas84 [53]

Answer:

Explanation:

The inner core (which is solid) is the hottest layer of the earth. It, therefore, contributes to heating up the outer core. The outer core is liquid and rotation of the earth (Coriolis effect) causes the molten rocks to swirl like a tornado. Because the outer core is mostly made of metals, that have lost electrons and hence charged (due to the enormous heat), the swilring effect causing an electric effect. This consequently causes the dynamo effect that creates a magnetic field. This magnetic field covers the earth and protects it from harmful radiation from the solar storms.

5 0

3 years ago

Does it take more, less, or the same amount of heat to melt 1.0 kg of ice at 0°C, or to bring 1.0 kg of liquid water at 0°C to t

Murljashka [212]

Answer : It takes less amount of heat to metal 1.0 Kg of ice.

Solution :

The process involved in this problem are :

$(1):H_2O(s)(0^oC)\rightarrow H_2O(l)(0^oC)\\\\(2):H_2O(l)(0^oC)\rightarrow H_2O(l)(100^oC)$

Now we have to calculate the amount of heat released or absorbed in both processes.

For process 1 :

$Q_1=m\times \Delta H_{fusion}$

where,

$Q_1$ = amount of heat absorbed = ?

m = mass of water or ice = 1.0 Kg

$\Delta H_{fusion}$ = enthalpy change for fusion = $3.35\times 10^5J/Kg$

Now put all the given values in $Q_1$ , we get:

$Q_1=1.0Kg\times 3.35\times 10^5J/Kg=3.35\times 10^5J$

For process 2 :

$Q_2=m\times c_{p,l}\times (T_{final}-T_{initial})$

where,

$Q_2$ = amount of heat absorbed = ?

m = mass of water = 1.0 Kg

$c_{p,l}$ = specific heat of liquid water = $4186J/Kg^oC$

$T_1$ = initial temperature = $0^oC$

$T_2$ = final temperature = $100^oC$

Now put all the given values in $Q_2$ , we get:

$Q_2=1.0Kg\times 4186J/Kg^oC\times (100-0)^oC$

$Q_2=4.186\times 10^5J$

From this we conclude that, $Q_1$ that means it takes less amount of heat to metal 1.0 Kg of ice.

Hence, the it takes less amount of heat to metal 1.0 Kg of ice.

5 0

3 years ago

How can one establish whether a liquid sample extracted from a plant is pure

Assoli18 [71]

The most accurate means of determining the purity of a substance is through the use of analytical methods. These methods, widely used in different industries, mostly involve chemical analysis, which can pinpoint the presence, identity and amount of impurities in the sample. The most simple chemical methods include gravimetry and titration. There are also the more advanced light-based or spectroscopic methods, such as UV-VIS spectroscopy, nuclear magnetic resonance and infrared spectroscopy. Chromatographic methods, such as gas chromatography and liquid chromatography, can also be used. Other methods used in testing the purity include mass spectroscopy, capillary electrophoresis, optical rotation and particle size analysis.

-basically nerdy talk for using machines controlling chemicals or other atoms to pinpoint any impurities

6 0

2 years ago

Helpp me pretty please

lubasha [3.4K]

Im pretty sure the answer is distance and mass

4 0

3 years ago

Read 2 more answers

Please help!!!

oee [108]

Answer:

Please help!!!

When a piston with a volume of 35 mL is heated from 298 K to 596 Kit

expands. Assuming the pressure on the piston remains constant, determine

the new volume of the cylinder. (round to the nearest whole number)

Explanation:

n0? = °^° hhaa jk

3 0

3 years ago