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.
![11. The ground state electron configuration of 29Cu atom is:
eHAr] 4s' 3de
b) [Ar] 4s' 4d
c) [Kr] 4s' 3dl0
d) [Kr) 4s 3d
e) [Ar] 4s' 3d
12. Which of the following isoelectronic ions has the smallest radius:
a) Ca
b) Mg
c) O
13. Which of the following compounds would be expected to bave the highest melting point?
d) S-
a) NCI,
c) MgCla
d) LICI
e) CCl.
14. Which of these species have two resonance structures?
a) CH,
b) CH;O
e) H2O
d) NO,CI
e) H;S
15. The formal charge on N in the Lewis structure of NO, is:
a) +2
b) +1
d) – 1
-2
16. which of the following compounds does not obey the octect rule?
a) SiCL
b) XeCle
c) PH,
d) H;S
O NO:
17.What is the molecular geometry (shape) of BrF, ?
a) T-shaped
d) trigonal pyramidal
b) tetrahedral
e) seesaw or distorted tetrahedral
square planar
18.
The hybridization of the central atom, P, in PCla is:
O sp
b) sp
c) sp
d) sp'd?
e) sp' d
19.
Which of the felowing compounds is polar (has a dipole moment)?
a) CF.
E) BeF,
d) XeF,
e) BF,
20. According to valence-bond theory, the bonding in ketene, H,CCO, is best described as
6 five a bonds.
c) four o bonds and two n bonds.
e) five a bonds.
b) three o bonds and two a bonds.
d) four o bonds and one x bond.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9ef2a955-c9e2-4072-907d-40ad84e26ad3%2Fcb27c38e-d786-4661-bf3f-e9327e52dded%2Fjgw1e6_processed.jpeg&w=3840&q=75)
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