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WorksheetsChemistry NCFE 2018-19 #1-15
Total questions: 15
Worksheet time: 15mins
1) Which isotope has the greatest number of protons?
Pa-238
U-240
Np-238
Pu-239
2) A neutral atom of a certain element has the electron configuration 1s22s22p63s23p4. How many valence electrons does the atom have?
4
6
11
16
3) What color of light does a hydrogen atom emit when an electron transitions from the n=6 energy level to the n=2 energy level?
orange
yellow
blue
violet
4) The equation below represents the radioactive decay of a gold isotope.
174 79 Au →17077 Ir + ?
Which choice correctly completes this equation?
alpha particle
beta particle
photon
neutron
5) A neutral atom has a ground state electron configuration of 1s22s22p63s2. The neutral atom becomes an ion during a chemical reaction. Which is the most likely charge of the ion?
2+
1+
2-
6-
6) How many electrons are in the outermost energy level of a neutral carbon atom?
2
4
6
8
7) The compound sodium chloride is placed in water and separates into ions. What are the correct names for these ions?
The chloride and sodium ions are cations.
The chloride and sodium ions are anions.
The sodium ion is the anion, and the chloride ion is the cation.
The sodium ion is the cation, and the chloride ion is the anion.
8) Which element will form covalent bonds with chlorine?
carbon
aluminum
magnesium
potassium
9) Which type of bonding or intermolecular forces is/are weakest?
London dispersion forces
hydrogen bonding
dipole-dipole forces
covalent bonding
10) What is the chemical formula for chromium(III) oxide?
CrO
CrO2
Cr2O3
Cr3O2
11) Based on the information in the table, what can be concluded?
Both solids contain only ionic bonds.
Both solids contain only covalent bonds.
Solid X contains only covalent bonds, and Solid Y contains only ionic bonds.
Solid X contains only ionic bonds, and Solid Y contains only covalent bonds.
12) What is the name of the compound with the chemical formula CoF3?
fluorocobalt
cobalt trifluoride
cobalt(III) fluoride
fluorine(III) cobalt
13) Which statement best compares how bond strengths affect the physical properties of iron and lead?
Iron has a higher melting point because the bonds in iron are stronger.
Iron has a higher melting point because the bonds in iron are weaker.
Lead has a higher density because the bonds in lead are stronger.
Lead has a higher density because the bonds in lead are weaker.
14) How is copper (Cu) classified based on its location on the periodic table?
a nonmetal
an alkaline earth metal
a transition metal
an alkali metal
15) What is the order of the elements from smallest to largest atomic radius?
Element 1, Element 2, Element 3
Element 1, Element 3, Element 2
Element 2, Element 1, Element 3
Element 2, Element 3, Element 1
