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erma4kov [3.2K]
3 years ago
15

Human population growth

Chemistry
1 answer:
jarptica [38.1K]3 years ago
3 0
Population depends on many things like raw materials, education( meaning if they have enough knowledege about birth control, development. For example in less developed country the life expectancy rate is low because of sanitation and medical purposes. But the population grows higher because birth rate increases. But in developed countries people have higher life expectancy and lower pirth rate so thier population decreases. I hope this helps.
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4) A 4.00 L balloon is filled with 0.297 moles of helium gas with a pressure
Nadya [2.5K]

Answer: 149

Explanation:

Using the ideal gas equation; PV = nRT

P= Pressure = 0.910 atm,     T= Temperature = ?

V= Volume = 4.0L                  R = Gas constant = 0.08206 L.atm/mol/K

n = number of moles = 0.297

Making 'T' the subject of the formular, we have;

T = P V/ n R   =  0.910  x 4  /  0.297 x 0.08206

                       =  149

6 0
3 years ago
You notice that heat is released during a chemical reaction. This reaction is a(n) _______ reaction.
inessss [21]
Exothermic. Exothermic exo meaning out, release heat while endothermic, endo as in in, take in heat.
6 0
3 years ago
What’s the full electronic configuration for lead
Mandarinka [93]

Answer:

1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4p6, 5s2, 4d10, 5p6, 6s2, 4f14, 5d10, 6p2.

Explanation:

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5 0
3 years ago
How many moles of nitrogen N are in 71.0g of nitrous oxide , N2O
timama [110]
1.6 moles of N2 in 71g
8 0
3 years ago
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When balanced, which equations would have the coefficient 3 in front of any of the reactants? Check all that apply. A. AgBr + Ga
stepan [7]

Answer:

The  answer to your question is Only A and B

Explanation:

Reactions

A.              3 AgBr  +   GaPO₄   →   Ag₃PO₄   +   GaBr₃

              Reactants            Elements         Products

                   3                           Ag                    3

                   3                           Br                     3

                   1                            Ga                    1

                   1                            P                       1

                   4                           O                      4

B.     3H₂SO₄     +   2B(OH)₃    →    B₂(SO₄)₃    +    6H₂O

             Reactants            Elements         Products

                 3                            S                      3

                  2                            B                      2

                 12                           H                     12

                 18                           O                     18                    

C.       Fe     +    2 AgNO₃    →    Fe(NO₃)₂    +   2 Ag

          Reactants            Elements         Products

                  1                         Fe                     1

                  2                        Ag                    2

                  2                        N                      2

                  6                        O                      6

D.          C₂H₄O₂    +    2O₂    →   2CO₂    +   2H₂O

          Reactants            Elements         Products

                 2                         C                      2

                 4                         H                      4

                 6                         O                     6    

7 0
4 years ago
Read 2 more answers
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