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Anni [7]
3 years ago
11

Select the choice that best completes the following sentence. Simple machines A. cannot be combined to make compound machines. B

. are tools that make work easier. C. reduce the amount of energy needed to do work. D. are made up of multiple moving parts.
Chemistry
1 answer:
Setler79 [48]3 years ago
4 0

B because machined make work 2x more work or higher

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In order to determine the magnetic properties of phosphorus atom we need to find out the number of unpaired electrons present in
Papessa [141]

Answer:

Think of it this way If you have a phosphorus atom whats its oposites once you found that out you may be able to find the answer

Explanation:

Hope this helps :)

7 0
3 years ago
In the ground state, has only 1 electron in a p orbital.
zepelin [54]
Aluminium is the element you are looking for
8 0
4 years ago
Read 2 more answers
What are the formal charges of both chlorines and iodine in icl2?
sergejj [24]

Answer:

Explanation:

 Formal charge of ICl₂⁻

Formal charge = group no - ( no of non bonding electrons +no of bonds)

In I there are 7 electrons in outermost orbit . If we add one more electrons due to - ve charge on the ion , it becomes eight . This centrally placed iodine forms two single bond with two chlorine atoms on either side.

Each of chlorine atoms also contains 7 valance electrons like iodine.

So formal charge of chlorine

= group no - ( no of non bonding electrons +no of bonds)

= 7 - ( 6 + 1 )

= 0

So formal charge of iodine

= group no - ( no of non bonding electrons +no of bonds)

= 7 - ( 5 + 2 )

=0

 Formal charge of ICl₂⁺

In this case , central iodine will have only 6 valence electrons due to absence one electron.

So formal charge of chlorine in  ICl₂⁺

= group no - ( no of non bonding electrons +no of bonds)

= 7 - ( 6 + 1 )

= 0

formal charge of iodine in  in   ICl₂⁺

7 - ( 4 + 2)

= 1

6 0
4 years ago
If equal volumes of 0.8M sodium lactate and 0.4M lactic acid are mixed, and the pKa of lactic acid is 3.86,
ANEK [815]

Answer:

4.16

Explanation:

Considering the Henderson- Hasselbalch equation for the calculation of the pH of the buffer solution as:

pH=pKa+log[base]/[acid]

Where Ka is the dissociation constant of the acid.

Given that:

pKa = 3.86

Given, concentration of acid = [acid] = 0.4 M

concentration of base = [base] = 0.8 M

So,

pH=3.86+log(0.8/0.4) = 4.16

7 0
4 years ago
Suppose 10 atoms of carbon (C) react with 20 atoms of oxygen (O) to form 10 molecules of carbon dioxide (CO2CO2). According to t
elena-s [515]

Answer:

30

According to the Law of Conservation of Matter, there will be 30 atoms of product in the reaction.

LAW OF CONSERVATION OF MATTER:

The law of conservation of matter states that matter can neither be created nor produced in a chemical reaction.

This further means that the amount of matter in the reactant of a reaction must equate that of the products.

Hence, if 10 atoms of carbon (C) react with 20 atoms of oxygen (O), there will be 10 + 20 = 30 atoms of product in this reaction.

Therefore, According to the Law of Conservation of Matter, there will be 30 atoms of product in the reaction.

4 0
3 years ago
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