Unit 5 Reactions and Stoichiometry

What is the percent composition by mass of nitrogen in (NH₄)₂CO₃ (gram-formula mass = 96.0 g/mol)?

• A. 14.6%

• B. 29.2%

• C. 58.4%

• D. 87.5%

In which type of reaction can two compounds exchange ions to form two different compounds?

• synthesis

• decomposition

• single replacement

• double replacement

What is the gram-formula mass of Ca(OH)₂?

• 29 g/mol

• 54 g/mol

• 57 g/mol

• 74 g/mol

Which type of organic reaction produces both water and carbon dioxide?

• addition

• combustion

• esterification

• fermentation

Which two terms represent types of chemical formulas?

• empirical and molecular

• polar and nonpolar

• synthesis and decomposition

• saturated and concentrated

Which sample contains a total of 9.0 x 10²³ atoms?

• 0.50 mole of HCl

• 0.75 mole of H₂O

• 1.5 moles of Cu

• 1.5 moles of H₂

In the reaction N₂ + 3H₂ → 2NH₃, how many grams of H₂ are needed to produce exactly 1 mole of ammonia?

• 1 g

• 2 g

• 3 g

• 4 g

Tags

NGSS.HS-PS1-7

The mass in grams of 1.00 mole of CaSO₄ · 2H₂O is

• 172 g

• 154 g

• 136 g

• 118 g

Tags

NGSS.HS-PS1-7

• synthesis

• decomposition

• single replacement

• double replacement

Which term represents a chemical reaction?

• deposition

• combustion

• sublimation

• vaporization

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5