WorksheetsREVIEW QUIZ-2ND QUARTER
Total questions: 29
Worksheet time: 15mins
1. According to the Bohr model, how many electrons can the first orbital hold?
2
4
6
8
2. What happens to the energy of an electron when it jumps from an outer to an inner orbit?
A. It is absorbed
B. It remains constant
C. It is emitted/released
D. It could either increase or decrease
3. In an Ionic bond, electrons are ____.
A. lost or gain
B.shared
C.both a and b
D.none of the above
4. A type of bond that results from equal sharing of electron is________.
A. ionic bond
B. nonpolar covalent bond
C.polar covalent bond
D.None of the above
5. Which of the following is an example of polar covalent bond?
A.S-C-S
B.H-H
C. O-O
D. Na-O
6. What do you call the ion which carry positive charge in its atom?
A.Anions
B.Cations
C.Polyatomic ions
D.Polymers ion
7. The name of each anions is obtained by adding the suffix ____ to the root of the atom name.
A.–ine
B.–ane
C.–ide
D.-ede
8. It is very important to remember that a chemical compound must have a net charge of _______.
A. 0
B. 1
C. 2
D. 3
9. It is the fourth most abundant element in the universe and is the building block of life on earth
A. Nitrogen
B.Carbon
C.Oxygen
D. Hydrogen
10. Amedeo Avogadro is an Italian scientist who used a constant number torepresent the mole of a substance. Which of these represents the number of units in one mole of any substance?
A.3.01 x 10'23
B. 6.02 x 10'23
C.3.01 x 10'24
D. 6.02 x 10'24
10. Amedeo Avogadro is an Italian scientist who used a constant number torepresent the mole of a substance. Which of these represents the number of units in one mole of any substance?
A.3.01 x 10'23
B. 6.02 x 10'23
C.3.01 x 10'24
D. 6.02 x 10'24
11. Which of the following units is used in expressing the amount of substance in terms of the number of particles?
A. Celsius
B. gram
C. liter
D. mole
12. It is obtained by summing the masses of the component atoms
A. Mole
B. Molar Mass
C. Molecules
D. Percent Composition
1. Which is the electron configuration of Oxygen (8e-)?
A.1s2-2s2-2p6
B. 1s2-2s2-2p4
C. 1s2-2s3-2p3
D. 1s1-2s2-2p3
2. Nitrogen has 5 valence electrons, and it is a diatomic. How many bonds are there in a N2 molecule?
A.single
B. double
C.triple
D. quadruple
3. The bonding of Calcium and Oxygen produce _______compound and the chemical formula for calcium oxide is _______.
A.covalent, CaO2
B. Ionic, CaO
C.Ionic, Ca2O3
D.Covalent, Ca2O2
4. Why do atoms react with one another to form chemical bonds?
A. to attain stability
B. to form molecules
C. to form compounds
D. to produce ions
5. What is the correct chemical formula for the ionic compound containing Calcium ion and Chlorine ion?
A.CaCl
B. Ca2Cl
C.CaCl3
D. CaCl2
6. These are elements which are chemically identical, but they differ markedly in their physical properties.
A.Diamond
B. Amorphous
C. Graphite
D.Allotropes
7. These are organic compounds that contain carbon and hydrogen atoms only.
A.Saturated
B. Isomers
C. Hydrocarbons
D. Acrogens
9. Which are TRUE about the uses of ethyl alcohol?
I. medicine II. Fuel III. Disinfectant IV. Fertilizer
A.I and II only
B.II and III only
C.III and IV only
D.I and IV only
10. Organisms use ____________ as energy sources, structural units, and for other purposes and are the largest class of organic compounds found in organisms.
A.Carbohydrates
B.Lipids
C.Proteins
D.Nucleic Acid
11. Which represents a mole?
A.6 g of NaCl
graphite, C-atom
B.6.02 x 1023 F atoms
C.3.01 x 1023 CH4 molecules
D.25 g
12. How is molar mass of a substance calculated?
A.Atomic mass of an element minus the number of atoms as indicated by
chemical formula.
B. Number of atoms as indicated by chemical formula divided by atomic weight.
C. Atomic mass of an element multiplied by the number of each atom of each element as indicated by chemical formula then add all the products of all the elements.
D. Number of atoms as indicated by chemical formula divided by atomic mass of an element.
13. How many percent of hydrogen (H) is present in water (H2O)?
A.12%
B.11%
C.13%
D.10%
14. Why is mole concept important?
A.It is useful when converting between grams and atoms or molecules.
B. It gives us a convenient way to express large numbers.
C. It can be applied to any type of particle representative.
D. All of the above
13. Who proposed the probability that electrons will be found in certain regions around the nucleus of an atom?
A. Niels Bohr
Thomson
B. Ernest Rutherford
C. Erwin Schrodinger
D. Joseph John
14. After ionic bonding metals tends to ______electrons to become _____ions
A. lose, positive
B. gain, negative
C. lose, neutral
D.gain, neutral
15. Why can metals be hammered without breaking?
A.They are ductile
B.They are malleable
C. They are not brittle
D.Their particles are strong
