1 Uma is calculating the gram atomic mass of sodium. She knows that the atomic mass of Na is 23 amu. What is the gram atomic mass of sodium? A 23 g B 46 g C 11.5 g D 6.022 × 10^23 g
2 The reactant that limits the amount of product formed is called: A Excess reagent B Catalyst C Limiting reagent D Product
3 Which statement about equilibrium is correct? A Equilibrium means reaction stops B Equilibrium can occur in open systems C Equilibrium is dynamic D Equilibrium favors reactants always
5 Zara is studying the characteristic properties of acids. She knows that acids have a sour taste and turn blue litmus red. What is the pH of a typical acid solution? A Less than 7 B Greater than 7 C Equal to 7 D Between 8 and 10
6 Ahmed is balancing the equation: Na + Cl2 → NaCl. What is the correct balanced equation? A 2Na + Cl2 → 2NaCl B Na + Cl2 → NaCl C Na + 2Cl2 → NaCl2 D 2Na + 2Cl2 → 2NaCl
7 Omar is learning about coating with a thin layer of another metal. He understands that tinning is coating iron with tin. What is the purpose of tinning? A To make the metal shiny B To prevent rusting and corrosion C To increase the metal's strength D To decrease the metal's weight
8 Vera is studying the rules for assigning oxidation states. She learns that the sum of oxidation states in a neutral compound is zero. In H2O, what is the sum of oxidation states? A 0 B +1 C -1 D +2
10 Fatima is studying endothermic reactions. She knows that photosynthesis is an endothermic process. What happens to the enthalpy (ΔH) in an endothermic reaction? A ΔH is negative B ΔH is positive C ΔH is zero D ΔH is undefined
11 Lara has 10 grams of calcium (Ca). She wants to calculate the number of moles. The atomic mass of Ca is 40 g/mol. How many moles does she have? A 0.25 moles B 0.5 moles C 1.0 moles D 2.0 moles
12 Tina is learning about redox reactions in photography. She understands that the developer reduces silver halide to silver. What is the role of the developer in the photographic process? A It oxidizes the silver halide B It is a reducing agent C It is an oxidizing agent D It dissolves the silver halide
13 Samir is learning about the formula of ionic compounds. He knows that the formula must be electrically neutral. What is the formula of the ionic compound formed between sodium (Na+) and sulfate (SO4^2-)? A NaSO4 B Na2SO4 C Na(SO4)2 D Na3SO4
14 Photosynthesis is an example of: A Exothermic reaction B Endothermic reaction C Neutral reaction D Decomposition
15 In dynamic equilibrium: A No reaction occurs B Only forward reaction occurs C Both reactions continue at equal rates D Only reverse reaction occurs
16 Lara is calculating the number of molecules in 0.5 moles of CO2. How many molecules? A 3.011 × 10^23 molecules B 6.022 × 10^23 molecules C 1.204 × 10^24 molecules D 1.806 × 10^24 molecules
17 Waseem is studying the empirical formula of a compound. He analyzes a compound and finds its mass composition: 32% sulfur and 48% oxygen. What is the empirical formula? (S=32, O=16) A SO B SO2 C SO3 D S2O3
18 Uma is studying the role of catalysts in industrial processes. She knows that catalysts are used in the Haber process and contact process. What is the catalyst used in the contact process for making sulfuric acid? A Iron B Vanadium pentoxide C Platinum D Nickel
19 Quinn is learning about alkalis. He knows that all alkalis are bases, but not all bases are alkalis. Which of the following is a base but not an alkali? A NaOH B KOH C Cu(OH)2 D Ca(OH)2
20 Hina is learning about redox in photography. She learns that the photographic process uses silver halides. What happens to the silver ions during the development of a photograph? A They are oxidized to silver metal B They are reduced to silver metal C They are dissolved in water D They are converted to silver nitrate
22 Chloe is studying the neutralization reaction. She knows that when an acid reacts with a base, salt and water are formed. What is the salt formed when hydrochloric acid reacts with sodium hydroxide? A NaCl B Na2SO4 C CH3COONa D NaNO3
24 Tina is studying the properties of bases. She knows that bases react with ammonium salts to release ammonia gas. What gas is released when sodium hydroxide reacts with ammonium chloride? A Hydrogen B Chlorine C Ammonia D Carbon dioxide
25 Removal of products shifts equilibrium toward: A Reactants B Products C No change D Stopping reaction