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3 years ago

I NEED AN ANSWER TO THESE QUESTIONS ASAP!! I GOT A TEST TOMORROW ON THIS!!!

1 answer:

5 0

18.The octet rule tells us that in every chemical reactions, elements will either gain or lose electrons to attain the noble gas electron configuration. This stable<span> electron configuration is known as the octet configuration since it is composed of 8 valence. Oxygen’s electron configuration is 1s2 2s2 2p4. So when</span> oxygen reacts with other elements to form compounds, it completes the octet configuration by taking 2 electrons from the element it reacts with

19. Actually pure metals are made up not of metal atoms but rather of closely packed cations (positively charge particles). These cations are then surrounded by a pack of mobile valence electrons which drift from one part of the metal<span> to another. This is called metallic bond.</span>

20. This is the energy which is needed to break a single bond. When the dissociation energy is large, this means that the compound is more stable. Since carbon to carbon bonds have high dissociation energy, therefore they are not very reactive.

21. Network solids are type of solids in which the atoms are covalently bonded to one another, so they are very stable. It takes higher temperature to melt them because breaking these covalent bonds required greater energy. Some examples are:
- Diamond
<span>-Silicon Carbide</span>

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Two moles of ideal He gas are contained at a pressure of 1 atm and a temperature of 300 K. 34166 J of heat are transferred to th

iragen [17]

Explanation:

The given data is as follows.

n = 2 mol, P = 1 atm, T = 300 K

Q = +34166 J, W= -1216 J (work done against surrounding)

$C_{v}$ = $\frac{3R}{2}$

Relation between internal energy, work and heat is as follows.

Change in internal energy ( $\Delta U$ ) = Q + W

= [34166 + (-1216)] J

= 32950 J

Also, $\Delta U = n \times C_{v} \times \Delta T$

= $3R \times (T_{2} - T_{1})$

32950 J = $3 \times 8.314 J/mol K \times (T_{2} - 300 K)$

$\frac{32950}{24.942} = T_{2} - 300 K$

1321.06 K + 300 K = $T_{2}$

$T_{2}$ = 1621.06 K

Thus, we can conclude that the final temperature of the gas is 1621.06 K.

8 0

2 years ago

The sun sum of protons and neutrons in the nucleus of an atom.

a_sh-v [17]

Answer is the mass of the atom. Protons + neutrons= mass
Let's say you have oxygen with a mass of 16.
Oxygen has 8 protons
To find neutrons subtract 16-8= 8
So it would also be 8 neutrons.
Example of how to find mass if you know protons + neutrons:
Sodium has 11 protons and 12 neutrons. Add the protons and neutrons
11 + 12= 23
Mass is 23

7 0

3 years ago

How the government support communities affected by xenophobia

Ann [662]

Answer:

They tax the citizens and then provide them with relief efforts

Explanation:

Common disease protocol

8 0

3 years ago

Read 2 more answers

If one or more nucleotide pairs are deleted from a dna strand, this is known as a:_________

Leya [2.2K]

If one or more nucleotide pairs are deleted from a DNA strand, this is known as a frameshift mutation

<h3>Define Frameshift Mutation</h3>

Insertions or deletions in the genome that are not multiples of three nucleotides are referred to as frameshift mutations. They are a particular class of insertion-deletion (indel) alterations that are present in polypeptides' coding sequences. Here, there are no multiples of three in the number of nucleotides that are added to or subtracted from the coding sequence. They may result from really basic alterations like the insertion or deletion of a single nucleotide.

<h3>Frameshift mutations' effects</h3>

One of the most harmful modifications to a protein's coding sequence is a frameshift mutation. They are quite prone to produce non-functional proteins that frequently interfere with a cell's metabolic processes and result in significant alterations to polypeptide length and chemical makeup. Frameshift mutations can cause the mRNA to stop translating too soon and create an extended polypeptide.

Learn more about Frameshift mutations here:-

brainly.com/question/12732356

#SPJ4

4 0

10 months ago

How to calculate moles

blondinia [14]

Explanation:

First you must calculate the number of moles in this solution, by rearranging the equation. No. Moles (mol) = Molarity (M) x Volume (L) = 0.5 x 2. = 1 mol.

For NaCl, the molar mass is 58.44 g/mol. Now we can use the rearranged equation. Mass (g) = No. Moles (mol) x Molar Mass (g/mol) = 1 x 58.44. = 58.44 g.

8 0

3 years ago

Read 2 more answers