Chemistry, 28.12.2019 03:31 alicat20

If you complete and balance the following oxidation-reduction reaction in basic solutionno2−(aq) + al(s) → nh3(aq) + al(oh)4−(aq)how many hydroxide ions are there in the balanced equation (for the reaction balanced with the smallest whole-number coefficients)?

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Answer from: caryscarpenter9118

There is one 1 hydroxide ion in the balanced equation.

Explanation:

Oxidation reaction is defined as the chemical reaction in which an atom looses its electrons. The oxidation number of the atom gets increased during this reaction.

$X\rightarrow X^{n+}+ne^-$

Reduction reaction is defined as the chemical reaction in which an atom gains electrons. The oxidation number of the atom gets reduced during this reaction.

$X^{n+}+ne^-\rightarrow X$

For the given chemical reaction:

$NO_2^-(aq.)+Al(s)\rightarrow NH_3(aq.)+Al(OH)_4^{-}(aq)$

The half cell reactions for the above reaction follows:

Reduction half reaction: $NO_2^-+5H_2O+6e^-\rightarrow NH_3+7OH^-$

Oxidation half reaction: $Al+4OH^-\rightarrow Al(OH)_4^{-}+3e^-$

Multiplying the Oxidation half reaction by 2 and we get that:-

$2Al+8OH^-\rightarrow 2Al(OH)_4^{-}+6e^-$

Adding the half reactions, we get that:-

$NO_2^-+5H_2O+2Al+OH^-\rightarrow 2Al(OH)_4^{-}+NH_3$

There is one 1 hydroxide ion in the balanced equation.

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

What do lines on a contour map indicate?

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