apart making it less stable. 18. Which of the following would be expected to have the lowest vapor pressure at 25°C? (A) N2 (B) Cl2 (C) Br, (D) 2 llame a o bolrdhete od meo.0 ol o g mos La boanam
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
![antaneous attractions than ethane,
cloud and more surface area available for
(C) Heptane's longer chain with more C-H bonds has more opportunities for hydrogen bonding to
form than ethane.
(D) Heptane has a carbon chain that is further apart making it less stable.
18. Which of the following would be expected to haye the lowest vapor pressure at 25°C?
(A) N2
(B) Cl,
(С) Br,
(D) I,
llame
19. In which of the following pairs of substances is the substance with the higher expected melting point
listed first?
(A) KCl or NaCl
(B) Mg or Al
(C) Ba or Cs
(D) Ar or Kr
boy
20. Which of the substances below would be expected to have the lowest boiling point at 1 atm pressure?
(A) (bent) F-O-F
(B) H-F
m) KO
O=0(
(D) [Li*][CH]
Combonue
21. Which factor(s) account for the observed difference in boiling points for the compounds below?
Compound
Ethane CH,CH3
Propane CH,CH,CH,
Boiling point
-89°C
-42°C
(A) stronger dipole-dipole attractions between propane molecules
(B) a larger number of covalent bonds within the propane molecule
a larger molar mass and more internal bonding in propane molecules
(D) a larger surface area and larger electron cloud in propane molecules](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5e3eb5b9-70f9-4c46-81e8-c844c47acf22%2F0124fb78-697c-4af4-9cf2-ea25d4c108aa%2Fk7ajrw.jpeg&w=3840&q=75)
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