WorksheetsChemistry - Grade 9 Unit 2 (2)
Total questions: 20
Worksheet time: 10mins
Our sun is composed mainly of these two gaseous elements. They are:
oxygen and nitrogen
carbon dioxide and helium
nitrogen and hydrogen
hydrogen and helium
This element is added to steel to make it exceptionally strong. This type of steel is now used in jewelry and stainless steel, The element added is:
nickel
molybdenum
silver
titanium
Which of these elements when added to water creates the largest explosion?
Na
K
Li
Cs
Which of the following symbols is gold?
Ag
Au
Ga
Ge
Which element is used in nuclear bombs?
U
C
Pu
He
What is the symbol for copper?
C
Cu
Co
Cr
Which gas is a Noble Gas?
Ne
O
N
H
What is the atomic number of uranium?
17
32
65
92
Which metal is more valuable than gold?
Pt
Ag
Cu
Zn
Which metal is liquid at room temperature?
Br
Hg
Mo
none of the above
Which element is a metalloid?
Cu
K
Si
Br
The number of groups or families is:
7
17
18
2
The metal used in planes to make them lighter is?
steel
aluminum
balsa
gallium
What is the atomic mass of Tl ?
204.4
286
200.6
207.2
Once used extensively in plumbing this element has been replaced because it was found to be toxic.
Cu
Pb
Cn
W
This element appears widely in the gases of volcanoes and hot springs as well as a impurity in coal and natural gas.
carbon dioxide
nitrogen
sulfur
chlorine
Used in world war 1 in chemical warfare.
nitrogen
chlorine
neon
hydrogen
Which gas produced this explosion in the Hindenburg?
He
Ne
O
H
How many periods are there in the periodic table?
6
7
8
9
What is the last naturally occurring element on the periodic table?
Pu
U
Pa
Lr
