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3 years ago

What is energy

Chemistry

2 answers:

pshichka [43]3 years ago

7 0

Answer:

it is s because enegy allows us to walk

uranmaximum [27]3 years ago

5 0

The ability to do work

You might be interested in

A neutral isotope has 49 neutrons and 36 electrons. Identify the element symbol of this isotope and determine the mass number an

Marta_Voda [28]

Explanation:

In an atom , the relation between the subatomic particles of the atom are given as follows -

For a neutral atom ,

Atomic number = number of protons = number of electrons ,

Mass number = number of protons + number of neutrons,

Hence , from the given information of the question,

number of neutrons = 49 ,

number of electrons = 36 ,

Hence , by using the above relation,

Atomic number = 36

number of protons = 36

Since ,

Mass number = number of protons + number of neutrons

Mass number = 36 + 49 = 85 .

By taking the help of periodic table , as atomic number = 36 ,

The elements is Krypton ( Kr )

Kr ⁸⁵₃₆

4 0

4 years ago

If a sample of cork has a mass of 2.88 g and a volume of 12.0 mL, what is the density of the cork? Show your work.

PilotLPTM [1.2K]

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

<h3> $density = \frac{mass}{volume}$ </h3>

From the question

mass of cork = 2.88 g

volume = 12 mL

The density is

$density = \frac{2.88}{12}$

We have the final answer as

0.24 g/mL

Hope this helps you

6 0

3 years ago

an irregularly shaped solid is dropped into a graduated cylinder filled with 45.00 mL of water. the water level with the object

posledela

The density of the object is 1.96 g/cm³.

Mass = 73.5 g

Volume = 82.5 mL – 45.00 mL = 37.5mL = 37.5 cm³

Density = mass/volume = 73.5 g/37.5 cm³ = 1.96 g/cm³

8 0

3 years ago

A) Calculate the standard free-energy change at 25 ∘C for the following reaction:

Genrish500 [490]

Answer:

A) ΔG° = -3,80x10⁵ kJ

B) E° = 2,85V

Explanation:

A) It is possible to answer this problem using the standard ΔG's of formation. For the reaction:

Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s)

The ΔG° of reaction is:

ΔG° = ΔGFe(s) + ΔGMg²⁺(aq) - (ΔGFe²⁺(aq) + ΔGMg(s) <em>(1)</em>

Where:

ΔGFe(s): 0kJ

ΔGMg²⁺(aq): -458,8 kJ

ΔGFe²⁺(aq): -78,9 kJ

ΔGMg(s): 0kJ

Replacing in (1):

ΔG° = 0kJ -458,8kJ - (-78,9kJ + okJ)

<em>ΔG° = -3,80x10² kJ ≡ -3,80x10⁵ kJ</em>

B) For the reaction:

X(s) + 2Y⁺(aq) → X²⁺(aq) + 2Y(s)

ΔG° = ΔH° - (T×ΔS°)

ΔG° = -629000J - (298,15K×-263J/K)

ΔG° = -550587J

As ΔG° = - n×F×E⁰

Where n are electrons involved in the reaction (<em>2mol</em>), F is faraday constant (<em>96485 J/Vmol</em>) And E° is the standard cell potential

Replacing:

-550587J = - 2mol×96485J/Vmol×E⁰

I hope it helps!

3 0

3 years ago

1. What is the name of the covalent compound CCl4?2. What is the name of the covalent compound N2O5?

mr_godi [17]

Answer:

It's carbon tetrachloride.

It's Dinitrogen Pentoxide.

Hope this helped!!!

5 0

3 years ago

Read 2 more answers