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Allushta [10]
3 years ago
13

According to its periodic table entry, how many electrons does nitrogen have in its valence level?

Chemistry
1 answer:
Goryan [66]3 years ago
3 0
The valence level of an atom refers to the number of electrons that reside in the upper most energy level. Nitrogen has an atomic number of 7 and therefore has 7 electrons. The first energy level (1) holds 2 electrons, leaving 5 electrons to reside in the second energy level (2s and 2p). Therefore the valence of nitrogen is 5. 
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Substance is matter with a composition that is ?
STatiana [176]

Answer:

A substance is a form of matter that will have a constant composition of evenly distributed products.

Explanation:

(Has to be the same everywhere)

8 0
3 years ago
How many joules of heat are required to heat 25.0 g of isopropyl alcohol from the prevailing room temperature, 21.2 oC, to its b
valentinak56 [21]

Answer:

3984.12 J joules of heat are required to heat 25.0 g of isopropyl alcohol to its boiling point.

Explanation:

Q=m\times c\Delta T=m\times c\times (T_2-T_1)

Where:

Q = heat absorbed or heat lost

c = specific heat of substance

m = Mass of the substance  

ΔT = change in temperature of the substance

T_1 = Initial temperature of the substance

T_2 = Final temperature of the substance

We have mass of isopropyl alcohol = m = 25.0 g

Specific heat of isopropyl alcohol  = c = 2.604 J/g°C

Initial temperature of the isopropyl alcohol = T_1=21.2^oC

Final temperature of the isopropyl alcohol = T_2=82.4 ^oC

Heat absorbed by the isopropyl alcohol to boil:

Q=25.0 g\times 2.604 J/g^oC\times (82.4^oC-21.2^oC)=3984.12 J

3984.12 J joules of heat are required to heat 25.0 g of isopropyl alcohol to its boiling point.

7 0
3 years ago
WILL GIVE BRAINLIEST PLZ HELP!!!!!!
LenKa [72]

Answer:

D

Explanation:

The picture depicts the data of the chemical, explaining that as the temperature rises, the chemical reaction rate would increase as well.

6 0
3 years ago
Given the standard entropy values in the table, what is the value of º for the following reaction?
Mandarinka [93]
Hello.

The answer is <span>+313.766 J/mol·K
</span>
 Use the coefficients of the reaction and sum the product entropies less the reactant entropies:

4*188.8 + 2*213.7 - 3*205.1 - 2* 126.8 = 313.7 J/mol*K

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8 0
4 years ago
Thermal energy will flow from the person to the desk
Leto [7]

Answer:

yes

Explanation:

8 0
2 years ago
Read 2 more answers
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