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Mrac [35]
3 years ago
15

En el aire, el oxígeno representa el 21%en volumen.

Chemistry
1 answer:
saw5 [17]3 years ago
8 0
Pregunta en guglu ay te ayudara
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This is a combination reaction.  Look at the 2 elements on left and a compound on the right.
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3 years ago
Which of the following moelcules have the intermolecular force called "hydrogen bonding" between the molecules?
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Answer:A

Explanation: A hydrogen bond is two hydrogen atoms being bonded together

5 0
3 years ago
A 5-gal, cylindrical open container with a bottom area of 120 square inches is filled with glycerin and rests on the floor of an
aleksandrvk [35]

Answer:

a)  68.9 b/ ft²

b)  57.416

Explanation:

Volume of the cylindrical open container V = 5 gal

= (5)(231)

= 11155 in³

different diagrammatic expression has been shown in the attached file below for clear understanding.

Area A = 120 in²

V = hA

    = \frac{1155}{120}

    =  9.625 in

Upward acceleration , a_z= 3ft/s^2

\frac{dp}{dz} = \rho (g + a_z)

dp= -\rho (g + a_z)dz

\int\limits^P}_0 \,dp= -\rho (g + a_z)  \int\limits^0_h \,   dz

P_b = -\rho (g + a_z) h

= (2.4)*(32.2+3) (\frac{9.625}{12})

= 68.9 b/ ft²

b) The flowchart for the resultant force is shown in the  diagram below:

with that:

F_f = P_bA

F_f =\frac{(68.9)(120)}{(144)}

F_f =57.416

Thus,  the resultant force that the container exert on the floor of the elevator during this acceleration = 57.416

5 0
3 years ago
Why is respiration an exothermic reaction?
Degger [83]

Answer: A large amount of energy is released into the surroundings.

Explanation:-

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and \Delta H which is difference between energy of products and energy of reactants come out to be positive.

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and \Delta H which is difference between energy of products and energy of reactants comes out to be negative.

Thus a reaction in which large amount of energy is released is categorized as exothermic reaction and thus respiration is also a exothermic reaction.

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3 years ago
What do elements in the first two columns of the periodic table have in common?
coldgirl [10]

Answer: b.) they tend to lose electrons to gain stability

Explanation:

5 0
3 years ago
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