science help?

Question

Which of the following statements is NOT true of covalent compounds?

a.they form when atoms of two elements share electrons.

b.they have weaker bonds than ions in crystal lettuce

c.they are composed of independence particles called molecules.

d.they have a higher melting point than ionic compounds.

Why dont water and oil mix?


Most soltions that contain molecules of covalent compounds do not conduct an electric current. True or False

Lemon changes the color of tea because the lemon contains a substances called a(n) ________. (acid or base)

Answer 1

This is better in the "Chemistry" catagory.
a. they form when atoms of two elements share electrons.
b. they have weaker bonds than ions in crystal lettuce
Not true: intra-molecular covalent bonding is not necessarily weaker than ionic bondings
c. they are composed of independence particles called molecules.
d. they have a higher melting point than ionic compounds.
DEFINITELY Not true: it is otherway.

Why dont water and oil mix?
Hydrogen bonding can be formed in water-water molecular interaction, but not in oil molecules---mix them would reduce intermolecular interaction.

Most soltions that contain molecules of covalent compounds do not conduct an electric current. True

Lemon changes the color of tea because the lemon contains a substances called a(n) citric acid

Answer 2

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