Chemistry - Grade 9 Unit 2 (2)

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