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2 years ago

Which of the following statements is true?

1 answer:

6 0

Generally in science and the natural world, when you break big things down into more pieces you increase disorder. In the natural universe the second law of thermodynamics tells us that disorder is increased in a closed system. I would say c. fission releases more energy than fusion. because bringing things together requires work and consumes energy. breaking things apart releases energy.

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Please help >>>>>>>>>>>

Vsevolod [243]

Answer:

Explanation:

mass of 1mole of brick = mass of 1 brick x avagadro number

= 4 kg x 6.022 x 10^23 bricks = 2.4 x 10^24 kg

No. of moles of bricks have a mass equal to the mass of the earth

= mass of earth / mass of 1 mole of brick

= [ 6 x 10^27 ] / [ 2.4 x 10^24 ]

= 2.5 x 10^3

= 2500 moles

7 0

3 years ago

What is the volume of a weather balloon that has 39 grams of helium with a density 0.017 g/mL?

olchik [2.2K]

Answer:

<h3>The answer is 235.29 mL</h3>

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

$volume = \frac{mass}{density} \\$

From the question.

density = 0.017 g/mL

mass = 4 g

We have

$volume = \frac{4}{0.017} \\ = 235.2941176...$

We have the final answer as

Hope this helps you

4 0

2 years ago

What is the overall cell potential for this redox reaction? Ca2+ + 2Li = Ca + 2Li+ Ca2+ + 2e- = Ca -2.87 V Li = Li+ + e- -3.05 V

Jet001 [13]

The redox reaction is

$Ca^{+2} + 2Li(s) = Ca(s) + 2Li^{+}$

Here

Calcium undergoes reduction, and acts as cathode

Lithium undergoes oxidation and acts as anode

The reduction potential of calcium is -2.87 V

The reduction potential of lithium is - -3.05 V

We know that

Ecell = Ecathode - Eanode

Ecell = -2.87 - (-3.05) = 0.18 V

4 0

3 years ago

WILL GIVE BRAINIEST IF HELP Which of these is a compound

NikAS [45]

b the awnser is b its a compound of carbon C and 2 oxygon atoms O sub 2

5 0

3 years ago

If a 125 gms of radioactive element has a half life of 60 min how many half lives will it go through to become 3.90625 gms

Sonja [21]

Answer:

Explanation:

Let the number of half lives be x

<u>Solve this equation to find the value of x:</u>

125*(1/2)ˣ = 3.90625
(0.5)ˣ = 3.90625 / 125
(0.5)ˣ = 0.03125
log (0.5)ˣ = log 0.03125
x = log 0.03125 / log 0.5
x = 5

4 0

2 years ago