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Genrish500 [490]

2 years ago

5

Which of the following best describes an atom? * the smallest unit of living things only the smallest unit of an element the sma

llest unit of nonliving things only the smallest unit of a compound

1 answer:

Maurinko [17]2 years ago

5 0

The smallest unit of element

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A natural disaster caused an ecosystem to experience a significant drop in species richness. What can you conclude about the eco

KATRIN_1 [288]

C. Theres decreased Biodiversity Most likely because of natural or human causes (deforistation)

3 0

2 years ago

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A 50.0 mL sample of a 1.00 M solution of CuSO4 is mixed with 50.0 mL of 2.00 M KOH in a calorimeter. The temperature of both sol

Reika [66]

Answer : The enthalpy change for the process is 52.5 kJ/mole.

Explanation :

Heat released by the reaction = Heat absorbed by the calorimeter + Heat absorbed by the solution

$q=[q_1+q_2]$

$q=[c_1\times \Delta T+m_2\times c_2\times \Delta T]$

where,

q = heat released by the reaction

$q_1$ = heat absorbed by the calorimeter

$q_2$ = heat absorbed by the solution

$c_1$ = specific heat of calorimeter = $12.1J/^oC$

$c_2$ = specific heat of water = $4.18J/g^oC$

$m_2$ = mass of water or solution = $Density\times Volume=1/mL\times 100.0mL=100.0g$

$\Delta T$ = change in temperature = $T_2-T_1=(26.3-20.2)^oC=6.1^oC$

Now put all the given values in the above formula, we get:

$q=[(12.1J/^oC\times 6.1^oC)+(100.0g\times 4.18J/g^oC\times 6.1^oC)]$

$q=2623.61J$

Now we have to calculate the enthalpy change for the process.

$\Delta H=\frac{q}{n}$

where,

$\Delta H$ = enthalpy change = ?

q = heat released = 2626.61 J

n = number of moles of copper sulfate used = $Concentration\times Volume=1M\times 0.050L=0.050mole$

$\Delta H=\frac{2623.61J}{0.050mole}=52472.2J/mole=52.5kJ/mole$

Therefore, the enthalpy change for the process is 52.5 kJ/mole.

8 0

3 years ago

What is the percent of N in

Pie

Answer:

8.24

Explanation:

the answer is explained above

7 0

2 years ago

What is energy efficiency, and why is increasing it important?

MrMuchimi

A measure of how much work we can get from each unit of energy. It's also important because we don't want to kill plants.

3 0

3 years ago

What is the potential energy of a 2-kg vase sitting on a table with a height of 1<br> meter?

lisov135 [29]

"20 J" is the "Potential Energy" of "vase" on the table.

<u>Explanation</u>:

The body possess some energy according to the position of the object that is the when an object is placed at a height it stores some energy it is called "Potential Energy".

Formula used to calculate the "Potential Energy" is $m\times g \times h$

Where, "m" is mass of vase is given that 2 kg, "g" is acceleration due to gravity is $10 m/s^2$ and "h" is height of the object where it placed is 1 m.

Substitute the given values in the formula,

Potential energy of the vase = $2\times10\times1$

Potential energy of the vase = 20 J

7 0

3 years ago