Which of the following statements about atoms are true? Atoms are always joined directly to other atoms.

Atoms may be joined together in well-defined molecules.

Atoms may be arranged in repeating crystal patterns.

All ordinary substances are made of atoms.

All known substances are made of molecules.​

Number 6 is correct all substances are made of molecules.

Explanation:

A molecule is a formation of atoms or a chemical and all substances are made of chemicals.

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24