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WorksheetsREVIEW for Q2 9WE
Total questions: 10
Worksheet time: 28mins
Name
Class
Date
1.
What is the electron configuration of gallium? (symbol= Ga)
a)
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1
b)
1s2 2s2 2p6 3s2 3p6 4s2 2s2 2p6 3s2 3p6 4s2 4d10 4p1
c)
1s2 2s2 3p6 4s2 3p6 4s2 3d10 4p5
d)
1s2 2s2 2p6 3s2 3p6 4s2 4d5 4p1
2.
Which set of atoms have 3 valence electrons?
a)
hydrogen, lithium, and sodium
b)
boron, aluminum, and galllium
c)
beryllium, magnesium, and calcium
d)
carbon, silicon, and germanium
3.
A white crystalline solid has a very high melting point and conducts a current when dissolved in water.
Which of the following BEST describe the type of bonding within the substance?
Which of the following BEST describe the type of bonding within the substance?
a)
covalent
b)
polar covalent
c)
metallic
d)
ionic
4.
A student is given two white crystalline substances. They must use lab equipment to determine the identity of the different substances. One is sucrose (C12H22O11) and one is sodium chloride (NaCl).
Which two of the following properties would help to differentiate between the two substances?
Which two of the following properties would help to differentiate between the two substances?
a)
Boiling point and density
b)
Conductivity and density
c)
Melting point and conductivity
d)
Solubility and conductivity
5.
An element that is located on the far left side of the periodic table is combined with an element from the far right side of the periodic table.
Which statement correctly describes the bond that would be formed?
Which statement correctly describes the bond that would be formed?
a)
An ionic bond due to the high electronegativity difference
b)
An ionic bond due to the low electronegativity difference
c)
A polar covalent bond due to the high electronegativity difference
d)
A polar covalent bond due to the low electronegativiy difference
6.
A student is trying to predict the formula of a new insoluble ionic compound made from substance A and substance B. He mixes the 2 substances in a variety of ratios shown below and views the results. (see above)
How could the student tell what the formula for the compound is?
How could the student tell what the formula for the compound is?
a)
The 4th test tube with the 1:1 ratio will be the proper ratio
b)
the test tube with the greatest amount of insoluble compound formed is the proper ratio
c)
The 1st test tube with the most of substance A will be the proper ratio.
d)
The 7th test tube with the most of substance B will be the proper ratio
7.
A new element Je has been discovered with 120 protons and 261 neutrons in its nucleus. It forms a compound with chlorine, Cl.
Based on the periodic table trends, which of the following would be the correct chemical formula for the compound?
Based on the periodic table trends, which of the following would be the correct chemical formula for the compound?
a)
JeCl
b)
JeCl2
c)
JeCl3
d)
Je3Cl2
8.
Why is the chemical explanation for why Group I elements on the Periodic Table react explosively?
a)
They are used in fireworks and emit bright lights when reacting.
b)
They only have one valenece electron, and therefore, will most readily give their electron away to another atom.
c)
They are metals.
d)
They make salts like NaCl.
9.
What do the elements beryllium, magnesium, and radium have in common?
a)
They all end in -ium, which indicates a functional relationship.
b)
They all lose two electrons and form anions
c)
They all have 2 valence electrons
d)
They are all alkali metals
10.
Sodium is a highly reactive element, while helium is highly non-reactive. Why is this?
a)
Sodium is an alkali metal and is very soft, which makes if easy to work with in a reaction. Helium is a noble gas, is more difficult to handle in a laboratory
b)
Sodium has a full valence shell already, so it does not need to tain or lose any electrons before a reaction can take place, making it easy to react with other substancs. Helium needs to lose an electron before it can react with anything, so it is difficult to react with other substances.
c)
Sodium is on the third period of the periodic table, and helium is on the first period. This difference in position indicates reactivity, ranging from least to most reactive.
d)
Sodium has only 1 valence electron, which is released easily to have a full valence shell. Helium has a full valence shell already, so therefore it does not gain or lose electrons, making it chemically inert
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