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4 years ago

In which species does nitrogen have an oxidation number of zero?

1 answer:

4 0

The most common species of nitrogen in which its oxidation state is zero is the diatomic nitrogen ( $N_{2}$ ). This is because the oxidation number of pure elements (whether alone as an atom or combined with other atoms of the same element such as the diatomic nitrogen) is always zero.

In addition to diatomic nitrogen, there are diazonium ( $R-N_{2}^{+}$ ) compounds where nitrogen has an oxidation number of zero.

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If 14.5 kJ of heat were added to 485 g of liquid water, How much would its temperature increase?

olga55 [171]

<u>Answer:</u> The increase in temperature is 7.14°C

<u>Explanation:</u>

To calculate the change in temperature, we use the equation:

$q=mc\Delta T$

where,

q = heat absorbed = 14.5 kJ = 14500 J (Conversion factor: 1 kJ = 1000 J)

m = mass of water = 485 g g

c = specific heat capacity of water = 4.184 J/g.°C

$\Delta T$ = change in temperature = ?

Putting values in above equation, we get:

$14500J=485g\times 4.184J/g.^oC\times \Delta T\\\\\Delta T=7.14^oC$

Hence, the increase in temperature is 7.14°C

3 0

3 years ago

Question 51 pts A breathalyzer is a device used to estimate the blood alcohol content of a suspected drunk driver by measuring t

Cerrena [4.2K]

Answer:

Four moles of electrons

Explanation:

The reactions in a breathalyzer are redox reactions. Fuel cell breathalyzers consists of fuel cells with platinum electrodes. The current produced depends on the amount of alcohol in the breath. Detection of alcohol involves the oxidation of ethanol to ethanoic acid. The two half cells set in the process are;

Anode;

C2H5OH(aq) + 4OH^-(aq) ----------> CH3COOOH(aq) + 3H2O(l) + 4e

Cathode;

O2(g) + 2H2O(l) +4e--------> 4OH^-(aq)

Hence four electrons are transferred in the process.

4 0

4 years ago

What is the momentum of a 5 kg object that has a velocity of 1.2 m/s?

saveliy_v [14]

Answer: the momentum is 6 Kgm/s

Explanation:

M= 5 kg

V= 1.2 m/s

Momentum = MV = 5 x 1.2 = 6 Kgm/s

3 0

3 years ago

Q. Calculate the number of atoms in each of the following (i) 52 moles of Ar (ii) 52 u of He (iii) 52 g of He

andreyandreev [35.5K]

$\huge\mathfrak\red{❥︎AnSweR:-}$

(i) 1 mole of Ar =6.022×10^23

atoms of Ar

52 mol of Ar=52×6.022×10 ^23

atoms of Ar =3.131×10 ^25 atoms of Ar

(ii) Atomic mass of He = 4amu

4amu is the mass of He atoms = 1

Therefore 52 amu is the mass of He atoms=0.25×52=13 atoms of He

(iii) Gram atomic mass of He = 4g

4g of He contains =6.022×10 ^23

atoms

Therefore 52 g of He contains=

6.022×10 ^23/4×52 =7.83×10 ^24 atoms

7 0

3 years ago

While a match burns what type of change occurs?

kotegsom [21]

Physicalchange. Lighting a match and letting is burn is an example of a chemical change. Chemical reactions cause chemicalchanges. In a chemical reactiontwo or more substances, called the reactants, form different substances called products.

8 0

3 years ago