Chemistry, 19.07.2019 05:30 lordicy

How does a lone pair contribute to molecular shape? a. it is too small to affect the molecule's shape. b. it takes up space like an "invisible" atom. c. it forces the molecule into a tetrahedral shape. d. it lets the bonding pairs spread out more.

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Answer from: Damagingawsomeness2

B. It takes up space like an "invisible" atom. 99% sure.

Answer from: helpmepls23

B. It takes up the space like an "invisible" atom.

Explanation: Lone pair of electrons are the pair of non bonding electrons which does not take part in the bonding unless and until there is a need of it.

Lone pair of electrons do occupy some space and thus are not too small to affects the molecule's shape.

These never forces the molecules into a tetrahedral shape.

As shown in the water molecule, they are repelling the bonding pairs of electrons so as that the tetrahedral shape gets distorted and force the molecule to take the angular shape.

How does a lone pair contribute to molecular shape? a. it is too small to affect the molecule's sha

Answer from: Quest

when 25.0 ml of 0.700 mol/l naoh was mixed in a calorimeter with 25.0 ml of 0.700 mol/l hcl, both initially at 20.0 °c, the temperature increased to 22.1 °c. the heat capacity of the calorimeter is 279 j/°c.

the equation for the reaction is:

naoh + hcl → nacl + h₂o

moles of hcl = 0.0250 l hcl ×

0.700

mol hcl

1 l hcl = 0.0175 mol hcl

volume of solution = (25.0 + 25.0) ml = 50.0 ml

mass of solution = 50.0 ml soln ×

1.00

ml soln

= 50.0 g soln

δt=t2-t1

= (22.1 – 20.0) °c = 2.1 °c

the heats involved are

heat from neutralization + heat to warm solution + heat to warm calorimeter = 0

q1+q2+q3=0

nδh+mcδt+cδt=0

0.0175 mol ×

δh

+ 50.0 g × 4.184 j·g⁻¹°c⁻¹ × 2.1 °c + 279 j°c⁻¹ × 2.1 °c = 0

0.0175 mol ×

δh

+ 439.32 j + 585.9 j = 0

0.0175 mol ×

δh

= -1025.22 j

δh=1025.22j0.0175 mol= -58 600 j/mol = -58.6 kj/mol

Answer from: Quest

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".

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