| 1 |
The total number of protons and neutrons present in the nucleus of an atom is called. |
- A. Mass number
- B. Atomic number
- C. Molecular mass
- D. Relative atomic mass
|
| 2 |
CO+ is an example of. |
- A. Free radical
- B. Cationic molecular ion
- C. Anionic molecular ion
- D. Stable molecule
|
| 3 |
Calcium has isotopes |
|
| 4 |
The Number of moles of CO2 which contain 8.0 of oxygen. |
- A. 0.25
- B. 0.15
- C. 0.35
- D. 1.45
|
| 5 |
Stoichiometric calculations cannot applied to reversible reactions because. |
- A. Product again changes to reactant
- B. Less product is formed
- C. Reaction goes only in one direction
- D. Products do not disappear.
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| 6 |
How many moles of AgCI are produced by combination of 1.0 mole of AgNO<sub>3</sub>and 2.0 mole of NaCI |
- A. 1.0
- B. 2.0
- C. 3.0
- D. 4.0
|
| 7 |
Cadmium has isotopes. |
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| 8 |
27g of Al will react completely with how much mass of O2, to produce Al2O3. |
- A. 8 g of oxygen
- B. 16 g of oxygen
- C. 32 g of oxygen
- D. 24 g of oxygen
|
| 9 |
Which statement about a molecule is incorrect. |
- A. It exist independently
- B. Molecules of a substances are similar
- C. Hemoglobin is a homoatomic molecules
- D. Oxygen molecule is a macromolecule
|
| 10 |
In stoichiometric calculations |
- A. The reaction can be reversile
- B. Side products can be formed
- C. Law of conservation of mass may not be obeyed
- D. Law of definite proportions is definitely obeyed
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