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BARSIC [14]
3 years ago
6

hi friends my brain is mentally challenged so therefore i need someone to help with my science hw bc it’s 4 in the morning and i

wanna go to sleep

Chemistry
2 answers:
Viefleur [7K]3 years ago
7 0

Answer:

12. 2 protons and 2 neutrons

13. decreased by 2

14. Energy

15. None

16. I believe is also none

17. None

Sorry but its about 3: 52 am and a bit sleepy.

Hope these are good answers for you!

Explanation:

horrorfan [7]3 years ago
6 0

Answer:

Row 1: 12= 2 protons and 2 neutrons.

           13= decreases by 2

Row 2: 14= 1 proton

            15= None (I’m not sure about this one)

Row 3: 16= 1 high-energy electron

            17= Increases by 1 or 2 (This one I don’t get either)

Sorry it isn’t all perfect I haven’t done this topic in ages. I hope I got it all right for you.

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Andreas93 [3]

(May not be 100% correct as there may be more context, but I hope this helps! Have a nice day!)

     We can tell it won't be Claim 1 as Claim 1 compares a reddish-brown substance to a gray/white substance.

     I am going to go with Claim 3 is most supported by the evidence because of the three descriptions of the different substances, none of them match.

7 0
3 years ago
Systematic name for Fe2O3 (s)
GREYUIT [131]
Cul (s) --> represents its state which means solid, Here Valency of copper is 1 so its cuprous. 

<span>Fe2O3--> Ferric Oxide is a solid. Here valency of Fe is +3 so its Ferric </span>

<span>CoF2--> Cobalt Flouride is a solid</span>

<span>FeO --> Ferrous Oxide is a solid. Here valency of iron is +2 so its Ferrous. </span>
7 0
3 years ago
Read 2 more answers
Phosphorus-32 is radioactive and has a half life of 14.3 days. Calculate the activity of a 3.5mg sample of phosphorus-32. Give y
Andreyy89

Answer:

The activity of P-32 is 3.7x10¹³ becquerels = 1.0x10³ curies.

Explanation:

The activity of P-32 can be calculated with the following equation:

A = \lambda N   (1)

Where:

N: is the number of atoms of P-32

λ: is the decay constant

We can find the number of atoms of P-32 as follows:

N = \frac{N_{A}*m}{M}  (2)

Where:

N_{A}: is the Avogadro's number = 6.022x10²³ atoms/mol

m: is the mass of P-32 = 3.5x10⁻³ g

M: is the molar mass of the radionuclide (P-32) = 32 g/mol    

Now, the decay constant is given by:

\lambda = \frac{ln(2)}{t_{1/2}}   (3)

Where:

{t_{1/2}}: is the half-life of P-32 = 14.3 days

Finally, we can find the activity of P-32 by entering equations (2) and (3) into (1):

A = \lambda N = \frac{ln(2)}{t_{1/2}}*\frac{N_{A}*m}{M} = \frac{ln(2)}{14.3 d*\frac{24 h}{1 d}*\frac{3600 s}{1 h}}*\frac{6.022 \cdot 10^{23} mol^{-1}*3.5 \cdot 10^{-3} g}{32 g/mol} = 3.7 \cdot 10^{13} dis/s      

Since a becquerel (Bq) is defined as a disintegration (dis) per second, the activity in Bq is:

A = 3.7 \cdot 10^{13} Bq

And, since a Curie (Ci) is 3.7x10¹⁰ Bq, the activity in Ci is:

A = 3.7 \cdot 10^{13} Bq*\frac{1 Ci}{3.7 \cdot 10^{10} Bq} = 1.0 \cdot 10^{3} Ci

Therefore, the activity of P-32 is 3.7x10¹³ becquerels = 1.0x10³ curies.  

               

I hope it helps you!

8 0
3 years ago
25 POINTS <br> Part C<br> Record what you observe in these images showing the banks of the Dead Sea.
NikAS [45]

One of the most significant characteristics of the Dead Sea is its salinity level. The images show the rock salt deposits on the shore.

<h3>What are the characteristics of the characteristics of the Dead sea?</h3>

  • Location

The dead dea is the most salty landlocked lake on the Earth surface. It is located in the middle East, between Israel and Jordania. Its nort-south length is about 80 km and its east-west wide varies between 7 and 20 km.

  • Afluent

The Jordan river is the most significan afluent on the Dead Sea, from which it receives most of its water.

  • Water level

The Dead Sea is the deepest and lowest water body on the Earth, being its surface level 400 mt below the sea level.

Due to different reasons, during the last decades, there was a sharp and continuous drop in the water level. For this reason the lake surface is decreasing year after year.

  • Salinity

Among its many characteristics, one of them -and probably the most notorious one- is the salinity.  The percentage of dissolved salts in the lake is much higher than the one recorded in the oceans, seas or lakes of the globe. Its value is between 8 and 10 times higher the salt level of oceans.

The salts present in the lake are chlorine, magnesium, sodium, calcium, potassium, bromine and sulfur. Their concentration vary according to the strate and deph, but it tends to increase toward the lake’s bottom. The high salinity level provides an oily aspect, bleach taste, and extreme density.

Several rock salt deposits can be seen on the shore and near it. Salt columns can also be seen in deepest areas. These structures are becomming more common with time, as water evaporates, water provision from afluent sources decreases, and salinity near the surface increases.

  • Forms of life

Mainly due to the extreme salt level, which turns to be lethal, almost no forms of life inhabit these waters. Only some bacteria species and one algae species can be found in the water, and some plant species near the coasts.

What we can observe in these images are the rock salt deposits on the shore.

You can learn more about the Dead Sea at

brainly.com/question/11851245

brainly.com/question/26055281

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What is part of every cell
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Cytoplasm is an organelle in every cell on earth.
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3 years ago
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