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4 years ago

Why do humans primarily form communities ?

Chemistry

2 answers:

AlladinOne [14]4 years ago

7 0

Easy B. is the answer

Tpy6a [65]4 years ago

6 0

Answer:

The correct answer is B. Humans primarily form communities to meet the needs of groups and individuals.

Explanation:

Humans are primarily a community and social species, since in their usual behavior they tend to get together with other humans to meet their objectives.

By being aware of the limitations of the individual in the fulfillment of their goals, social groups are generated with common objectives, whose actions tend to that fulfillment.

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How many moles are in 3.14 x 10^25 particles of tin?

lakkis [162]

Answer:

52.1409259 moles.........

5 0

3 years ago

Rewrite these word equations as chemical equations.

stich3 [128]

Answer:

FeCl3 + Ca(OH)₂ --> Fe(OH)3 + CaCl2

3 0

4 years ago

Which statement is false? a) When reactants become products, they do so through an intermediate transition state. b) At equilibr

Tom [10]

Answer:

b) At equilibrium, equal amounts of products and reactants are present.

Explanation:

At equilibrium , the ratio of product of concentration of products and product of concentration of reactants is constant .

A + B ⇄ C + D

[C] [ D] / [ A ] [ B ] = Constant

So, the statement ( b ) is false .

All other statements are true .

8 0

3 years ago

Two aqueous sulfuric acid solutions containing 20.0 wt% H2SO4

kozerog [31]

Answer:

The feed ratio (liters 20% solution/liter 60% solution) is 3,08

Explanation:

In this problem you have a 20,0 wt% H₂SO₄ and a 60,0 wt% H₂SO₄ solutions.

100 kg of 20% solution are 100kg/1,139 kg/L = 87,8 L 

100kg×20wt% = 20 kg H₂SO₄. In moles:

20 kg H₂SO₄ × (1 kmol/98,08 kg) = 0,2039 kmol H₂SO₄≡ 203,9 mol

The final molarity 4,00M comes from:

$\frac{203,9 moles+ Xmoles}{87,8L + Yliters}$ (1)

Where X moles and Y liters comes from 60,0 wt% H₂SO₄

100 L of 60,0 wt% H₂SO₄ are:

100L× $\frac{1,498 kgsolution}{L}$ × $\frac{60 kg H_{2}SO_{4}}{100kgSolution}$ × $\frac{1kmol}{98,08kg H_{2}SO_{4}}$ = 0,9164 kmolH₂SO₄ ≡ 916,4 moles

That means:

X/Y = 916,4/100 = 9,164 (2)

Replacing (2) in (1):

Y(liters of 60,0 wt% H₂SO₄) = 28,52 L

Thus, feed ratio (liters 20% solution/liter 60% solution):

87,8L/28,52L = 3,08

I hope it helps!

8 0

3 years ago

Define exothermic reaction. Define endothermic reaction.

balandron [24]

Exothermic reaction = the term exothermic process describes a process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light, electricity,

Endothermic reaction = An endothermic process is any process with an increase in the enthalpy H (or internal energy U) of the system. In such a process, a closed system usually absorbs thermal energy from its surroundings, which is heat transfer into the system.

4 0

3 years ago