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2 years ago

You need to know "Law of Conservation of Mass" Lolol Please help asap!

Chemistry

2 answers:

suter [353]2 years ago

8 0

Answer:''Jump to First law of thermodynamics — In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. ... For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodes.'' got off the internet but i know this is right because i had this question

Explanation:

ANEK [815]2 years ago

3 0

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Suppose you were preparing 1.0 L of a bleaching solution in a volumetric flask, and it calls for 0.21 mol of NaOCl. If all you h

yulyashka [42]

Answer:

0.256 L

Explanation:

We should use the following formula:

concentration (1) × volume (1) = concentration (2) × volume (2)

concentration (1) = 0.82 M NaOCl

volume (1) = ?

concentration (2) = 0.21 M NaOCl

volume (2) = 1 L

volume (1) = [concentration (2) × volume (2)] / concentration (1)

volume (1) = [0.21 / 1] / 0.82 = 0.256 L

3 0

2 years ago

Read 2 more answers

In solid NaCl, the equilibrium separation between neighboring Na+ and Cl- ions is 0.283 nm. Calculate the coulombic energy betwe

const2013 [10]

Explanation:

It is given that r = 0.283 nm. As 1 nm = $10^{-9} m$ .

Hence, 0.283 nm = $0.283 \times 10^{-9} m$

Formula for coulombic energy is as follows.

$U_{coulomb} = -1.748 \frac{e^{2}}{4 \pi \epsilon_{o} r}$

where, e = $1.6 \times 10^{-19}$ C

$\epsilon_{o}$ = $8.85 \times 10^{-12}$

$U_{coulomb} = -1.748 \frac{(1.6 \times 10^{-19}^{2}}{4 \times 3.14 \times 8.85 \times 10^{-12} \times 0.283 \times 10^{-9}}$

= $1.423 \times 10^{-18} J$

As 1 eV = $1.6 \times 10^{-19} J$

So, 1 J = $\frac{1 eV}{1.6 \times 10^{-19}}$

Hence, U = $\frac{1.423 \times 10^{-18} J}{1.6 \times 10^{-19} J}$

= 8.9 eV

Also, 1 J = $\frac{10^{-3} kJ}{6.022 \times 10^{23}mol}$

= $1.67 \times 10^{-27}$ kJ/mol

Therefore, U = $1.423 \times 10^{-18} J \times 1.67 \times 10^{-27}$ kJ/mol

= $2.37 \times 10^{-45} kJ/mol$

7 0

2 years ago

Why is it important to make observations about the reactants?

Free_Kalibri [48]

Answer:

Reason Down below

Explanation:

It is important because when you make observation you get a clue sometimes and it reactants i feel like it also takes places with observation. :)

7 0

3 years ago

Which group (give the number) is characterized by 5 valence electrons in the configuration<br> s²p3?

Ivahew [28]

<h3>Answer:</h3>

Group 5A

<h3>Explanation:</h3>

Elements in the periodic table are arranged into columns known as groups and rows known as periods.
Elements in the same group share similar chemical properties.
For example, elements in group 5A have five valence electrons with the most high energy level with a configuration of s²p³.
Elements in group 5A include nitrogen and phosphorus among others.

5 0

3 years ago

Which of the following shows three elements in order of decreasing electronegativity?

damaskus [11]

Answer:

The correct answer is option D which is the decreasing order of conductivity is Mn, O, Ge.

Explanation:

You can easily answer this if you know the periodic trends. For the property of electrical conductivity, it decreases across a period and decreases also down a group. Thus, the most conductive element must be Mn, while the least conductive one is Ge. So, the answer is: -Mn, O, Ge

7 0

3 years ago