Chemistry, 15.12.2019 02:31 lexybellx3

Which of the following is not a characteristic of most ionic compounds?

a) they are composed of metallic and nonmetallic elements.

b) when melted, they
conduct an electric current.

c) they are solids.

d) they have low melting points.

Answers: 1

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Answers

Answer from: ieyaalzhraa

D. Because the bonds of ionic compounds are very strong, they actually have high melting points, not low melting points

Answer from: perfect32

The correct option is D

Explanation:

Ionic compounds are compounds that have ionic interaction/bond within its molecule. Ionic bond/electrovalent bond involves the transfer of electron(s) between the constituent atoms. Here, an atom (usually a metal) donates electron(s) to become positively charged and another atom (usually a non-metal) receives the donated electron(s) to become negatively charged. These charged ions are good carriers of electric charges hence when these compounds dissolve in water, they conduct electricity.

They are also solids with high melting points, this is because of the ions formed after the transfer of electrons. These ions are strongly attracted to each other making it difficult for this bond to be broken. Hence, option d is the right answer.

Answer from: Quest

Dmight be the correct answer

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

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Which of the following is not a characteristic of most ionic compounds?

a) they are com...

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