Chemistry of Life Pretest

1.     In the following reaction, name the reactant(s)?  LiCl + K₂S → Li₂S + KCl

• Li₂S + KCl     

• LiCl + K₂S

• LiCL and Li₂S

• all of them are reactants

In the following reaction, name the product(s)?  LiCl + K₂S → Li₂S + KCl

• Li₂S + KCl     

• LiCl + K₂S

• LiCL and Li₂S

• all of them are reactants

Which of the following is characteristic of a base?

• Bitter taste

• Has a pH less than 7

• Turns litmus red

• All of the above

Which of the following equations follows the Law of Conservation of Mass?

• Fe + O₂ → Fe₂O₃

• Ca + H₂O → Ca(OH)₂ + H₂

• P + O₂ → P₂O₅

• H₂CO₃ → CO₂ + H₂O

Which of the following elements are all major components in forming the molecules in all living things (the big six)?

• neon, sulfur, fluorine

• carbon, chlorine, aluminum

• iodine, potassium, bromine

• carbon, oxygen, nitrogen

The following chemical reaction H₂CO₃ → H₂O + CO₂ is a

• synthesis reaction   

• single-replacement reaction

• decomposition reaction

• double-replacement reaction

The following chemical reaction Ca + 2H₂O → Ca(OH)₂ + H₂ is a

• synthesis reaction

• single-replacement reaction

• decomposition reaction

• double-replacement reaction

How many atoms are there in one molecule of calcium nitrate, Ca(NO₃)₂?

• 5

• 8

• 7

• 9

The following chemical reaction 4Fe + 3O₂ → 2Fe₂O₃ is a

• synthesis reaction   

• single-replacement reaction

• decomposition reaction

• double-replacement reaction

The following chemical reaction HCl + NaOH → NaCl + H₂O is a

• synthesis reaction   

• single-replacement reaction

• decomposition reaction

• double-replacement reaction