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3 years ago

The tilt of the Earth on its axis causes

Chemistry

2 answers:

AleksandrR [38]3 years ago

6 0

Answer:

the season hope this :}

Ket [755]3 years ago

4 0

The seasons. This is because when Earth is on an angle, different parts of the world get different amounts of heat, making temperatures different, and therefore changing the environment.

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The air bags in cars are inflated when a collision triggers the explosive, highly exothermic decomposition of sodium azide (NaN3

Oksanka [162]

Answer : The mass of $NaN_3$ required is, 166.4 grams.

Explanation :

First we have to calculate the moles of nitrogen gas.

Using ideal gas equation:

$PV=nRT$

where,

P = Pressure of $N_2$ gas = 1.00 atm

V = Volume of $N_2$ gas = 113 L

n = number of moles $N_2$ = ?

R = Gas constant = $0.0821L.atm/mol.K$

T = Temperature of $N_2$ gas = $85^oC=273+85=358K$

Putting values in above equation, we get:

$1.00atm\times 113L=n\times (0.0821L.atm/mol.K)\times 358K$

$n=3.84mol$

Now we have to calculate the moles of sodium azide.

The balanced chemical reaction is,

$2NaN_3(s)\rightarrow 2Na(s)+3N_2(g)$

From the balanced reaction we conclude that

As, 3 mole of $N_2$ produced from 2 mole of $NaN_3$

So, 3.84 moles of $N_2$ produced from $\frac{2}{3}\times 3.84=2.56$ moles of $NaN_3$

Now we have to calculate the mass of $NaN_3$

$\text{ Mass of }NaN_3=\text{ Moles of }NaN_3\times \text{ Molar mass of }NaN_3$

Molar mass of $NaN_3$ = 65 g/mole

$\text{ Mass of }NaN_3=(2.56moles)\times (65g/mole)=166.4g$

Therefore, the mass of $NaN_3$ required is, 166.4 grams.

3 0

3 years ago

In the chemical formula, is the metal or nonmetal symbol written first?

Nikitich [7]

<span>Chemical formulas are written from the most metllic
for example group Alkali Metals are the most metallic, so they will be written first.</span>

6 0

3 years ago

An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are ____.

dmitriy555 [2]

Answer:

76 protons 76 electrons

Explanation:

The atomic number in a element is equal to the elements protons and electrons. In this case if the atomic number is 76 the number of protons and electrons would also be 76.

Hope this helps.

8 0

2 years ago

Assume that the heat lost by the surface is gained by ethyl chloride. What enthalpies must you consider if you were to calculate

Ann [662]

Answer:

Specific heat of ethyl chloride in gas and liquid phases, enthalpy of vaporization and specific heat of solid surface.

Explanation:

In order to determine the final temperature, the heat lost by the chloride needs to be found. This would require the specific heat in both phases and the enthalpy of vaporization. (you will use q=mc(delta)T and q=m(delta)H)

Then the energy gained by the surface needs to be found. This will require the specific heat in order to use the q=mc(delta)T equation.

3 0

3 years ago

Which of these is an example of altering the molecular composition of a substance? Cooking an egg Breaking a glass Crushing a me

erica [24]

Answer:

Explanation:

Simply put, one of these is not like the others. The only one involved with changing instead of reshaping is the egg.

7 0

3 years ago

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