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3 years ago

12

Please no links. Answer properly please and thank you. Perform the following mathematical operation and report the answer to the

correct number of significant figures. 0.092/8.3

2 answers:

kirill [66]3 years ago

4 0

Answer:

The answer is 0.011

MA_775_DIABLO [31]3 years ago

3 0

i'm extremely sorry if this is wrong but i got 0.0110843 or as a fraction 23/2075 i'll write my work in the comments

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Use the terms “valence electrons”, “noble gas configuration”, “ionization”, and “octet rule” in a sentence.

WARRIOR [948]

Answer: Noble gas configuration is the ionisation of valence electrons using the octet rules.

Explanation:

Noble gases are the halogen, iodine etc. they form molecules using anion valence electrons in order build octet structures.

5 0

3 years ago

commercial cold packs consist of solid NH4NO3 and water. In a coffee-cup calorimeter, 5.60g NH4NO3 is dissolved in 100g of water

fgiga [73]

Answer:

-1.37 kJ/mol

Explanation:

The expression for the calculation of the enthalpy of dissolution of [tex[NH_4NO_3[/tex] is shown below as:-

$\Delta H=m\times C\times \Delta T$

Where,

$\Delta H$ is the enthalpy of dissolution of [tex[NH_4NO_3[/tex]

m is the mass

C is the specific heat capacity

$\Delta T$ is the temperature change

Thus, given that:-

Mass of ammonium nitrate = 5.60 g

Specific heat = 4.18 J/g°C

$\Delta T=17.9-22.0\ ^0C=-4.1\ ^0C$

So,

$\Delta H=-1.25\times 4.18\times 3.9\ J=-95.9728\ J$

Negative sign signifies loss of heat.

Also, 1 J = 0.001 kJ

So,

$\Delta H=-0.096\ kJ$

Also,

Molar mass of [tex[NH_4NO_3[/tex] = 80.043 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{5.60\ g}{80.043 \ g/mol}$

$Moles= 0.06996\ mol$

Thus, $\Delta H=-\frac{0.096}{0.06996}\ kJ/mol=-1.37\ kJ/mol$

6 0

4 years ago

How does collision theory relate temperature to the rate of a reaction?

nadya68 [22]

Answer:

Explanation:

The collision theory explains why reactions occur between atoms, ions, and molecules. With the increase in temperature, there is an increase in the number of collisions. Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate.

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3 years ago

In which environment would primary succession take place? Select 2 options.

kotegsom [21]

Answer:

a cooling lava flow

a deserted mine

Explanation:

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3 years ago

Read 2 more answers

Why do many parasites eventually need new hosts?

Maslowich

Parasite lives off the host so if the host dies, they are forced to look for another host. They can also leave its host if the parasite kills its host when it finds a new host, because if the parasite does not have a host its dies off.
Hope this can help explain

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4 years ago