Some compounds such as CO_2, CO, carbonates and bicarbonates are studied in _______________ chemistry.

• Organic

• Inorganic

• Industrial

• Nuclear

A compound with a chemical formula Na₂CX₃ has a formula mass 106 amu. What is the atomic mass of X? (atomic mass C=12. Na = 23 )

• 106

• 23

• 12

• 16

How many atoms are there in 1.25 moles of Zn?

•  $6.53\ \times10^{23}$  

•  $7.59\ \times10^{23}$  

•  $8.53\ \times10^{23}$  

•  $9.53\ \times10^{23}$  

The empirical formula of for caffeine is ( C₈H₁₀N₄O₂ )

• C₅H₅N₂O

• C₄H₅N₂O

• C₄H₅NO

• C₄H₅NO₂

Acetic acid is ____________ compound.

• organic

• Inorganic

• nuclear

• metallic

The empirical formula of glucose is ­­­­­­­­­­­­­­_____________.

• C₆H₁₂O₆

• C₂H₄O

• CH₂O

• CHO

The chemical reactions occurs in photosynthesis are studied in ____________ chemistry.

• Industrial

• inorganic

• biochemistry

• environmental

Which of the following is a molecular ion?

• CN⁰

• H₂

• N₂⁺

• He⁺

Positively charged ions are obtained when

an atom ________________.

• gain electron

• lose proton

• Lose electron

• gain neutron

Which of the following is a formula unit?

• NaCl

• H₂O

• O₂

• NH₃