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horsena [70]
3 years ago
5

Which choice describes a community?

Chemistry
2 answers:
kompoz [17]3 years ago
7 0

All of the populations of organism living and interaction in a particular area make up a biological community.  

It means species make a population, and pollution make biological community  

 

Species ------ > population ------- .>community

hence the correct answer is B.

a forest of birds, insects, and squirrels

34kurt3 years ago
5 0
The answer would be A.
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A cup of coffee (140g) cools from 75°C down to comfortable room temperature 20°C. How much energy does it release to the surroun
Thepotemich [5.8K]

Given that the mass of coffee in the cup = 140 g

Final temperature = 20^{0}C

Initial temperature = 75^{0}C

Let us assume the specific heat of coffee is equal to that of water = 4.184\frac{J}{g^{0}C }

Temperature change = T(final) - T(initial) = (20 - 75 )^{0}C

                                                                   =- 55 ^{0}C

-Heat given out by coffee = heat absorbed by the surroundings

Heat released into the surroundings =-(mC(T_{final}-T_{initial}))

                                             = -(140g)4.184\frac{J}{g^{0}C }( -55^{0}C)

                                             = 32,217 J

4 0
4 years ago
Each of the chemically active Period 2 elements forms stable compounds in which it has bonds to fluorine.(a) What are the names
Softa [21]

The names of the compound are lithium fluoride ( LiF) , beryllium difluoride (BeF2) , Boron trifluoride (BF3) , carbon tetrafluoride (CF4) , nitrogen trifluoride (NF3) , oxygen difluoride (OF2) .

Lithium is the first element of period 2 which reacts with fluorine to form LiF ( lithium fluoride ) . it is an inorganic compound . it is also a colorless solid . it is less soluble in water . it is chemically stable because of its comparable molecular mass .

Beryllium is the second element of period 2 which reacts with fluorine to give beryllium difluoride (BeF2) . it is inorganic compound . it is highly soluble in water. it is also a stable compound . it have low melting point .

Boron is the third element of period 2 which reacts with fluorine to form

BF3 (Boron trifluoride ) . it is a inorganic compound . it is colorless and toxic gas forms  . it is stable in dry atmosphere but its octet is not satisfied .

Carbon is the 4th element of the period 2 which reacts with fluorine to form carbon tetrafluoride (CF4) . it is not soluble in water . it is a greenhouse gas . it dissolves in oil. it is very stable compound .it forms covalent bond .

Nitrogen is the 5th element of period 2 which reacts with fluorine to form nitrogen trifluoride (NF3) . it is also a inorganic compound . it  is colorless and non-flammable .  it is a stable gas at room temperature .

Oxygen is the 6th element of period 2 which reacts with fluorine to form oxygen difluoride (OF2) . it is colorless poisonous gas . it is partially stable or relatively stable .

Neon is a noble gas and also a stable element . it is odorless and colorless . so it is nonreactive . so it doesn't form bond with fluorine .

<h3>Learn more about Fluorine here :</h3>

brainly.com/question/3494441

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8 0
2 years ago
Does icicles have cells
SOVA2 [1]
No icicles are water made up of atoms not cells
6 0
3 years ago
Is the law of conservation of mass valid during chemical reactions?
Elan Coil [88]

YES LAW OF CONSERVATION OF MASS IS VALID DURING BECAUSE IT STATE THAT THE TOTAL MASS OF PRODUCTS MUST BE EQUAL TO THE TOTAL MASS OF REACTANT

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D.) releases H+ ions
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