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il63 [147K]
3 years ago
15

Alkaline earth metals are very reactive because of how many valence electrons ?

Chemistry
1 answer:
Alborosie3 years ago
8 0
Their is 2 valence electrons
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What is the osmotic pressure, in torr, of a 3.00% solution of NaCl in water when the temperature of the solution is 45 ºC? Enter
Anit [1.1K]

213034 torr is the osmotic pressure.

Explanation:

osmotic pressure is calculated by the formula:

osmotic pressure= iCrT

where i= no. of solute

c= concentration in mol/litre

R= Universal Gas constant

T = temp

It is given that solution is 3% which is 3gms in 100 ml.

let us calculate the concentration in moles/litre

3gm/100ml*1000ml/1L*1mol NaCl/55.84g NaCl

= 5.372 gm/litre

Putting the values in the formula,                   Temp in Kelvin 318.5K

osmotic pressure= 2*5.372*0.083 * 318.5                 Gas constant  0.083

                              = 284.023 bar or 213018 torr.                 c=  5.372 moles/L                                                                              

                                                                                    i=2 for NaCl

4 0
3 years ago
3. Give one example of an element and one
zhenek [66]

Answer:

Element: H (hydrogen)

Compound: H2O (water)

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7 0
3 years ago
Please help me there is 19 questions
cupoosta [38]

Answer:

1. Hubble

2.Aristarchus

3.Galileo

4.Aristotle

5.Kepler

6.Jupiter

7.Mercury

8.Uranus

9.Venus

10.Earth

11. Jupiter and Mars

12. sun

13.D

14. Saturn

15.Gas giants

16.Kuiper Belt and Ceres,Pluto,eris and haumea.

17.pluto

18.Ptolemy's model

19.meteor- a small body of matter from the outer surface that enters the earth's atmosphere.

meteoroid- a small body moving in the solar system that would become a meteor if it enters the earth's atmosphere.

meteorite- a piece of rock or metal that has fallen to the earth's surface from outer space as a meteor.

the relationship is the diagram I drew at the top.

hope this was helpful

6 0
2 years ago
1.) A solute is separated from its solvent my evaporation. What kind of process is this?
RideAnS [48]
1) C !! Physical Process

2) A

3) D !! Water is universal solvent !

if you need any explanation ; comment !!
8 0
3 years ago
What is C2H8 ? please hurry<br> (CH4=methane)<br> (C2H2=acetylene)
JulijaS [17]

Answer:

Carbon carbon | C2H8 - PubChem.

Explanation:

Brainliest plz :)

6 0
3 years ago
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