Chemistry Concepts Quiz

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Questions and Answers

Determine the correct answer to the following operation with correct significant figures: $16 + 33.35 / 5.2$

9.5

9.42 (correct)

9.4

9.49

Which of the following is not correct regarding periodic table and periodicity?

Transition metals are located in the center of the periodic table (Groups 3-12).

Elements in the same group have similar chemical properties.

Noble gases in Group 18 are mostly inert under standard conditions.

Nonmetals are found only in Groups 1 and 2 of the periodic table. (correct)

Which of the following is not correct regarding electrolytes?

A higher concentration of non-electrolytes increases conductivity. (correct)

Weak electrolytes partially dissociate into ions in water.

Electrolyte strength depends on the extent of ionization or dissociation in water.

Strong electrolytes completely dissociate into ions in water.

A plane is descending at a rate of 2200 feet per minute. How many meters does the plane descend in a second?

3.1 Signup and view all the answers

According to the trends in the periodic table, predict the charge of the stable ion(s) of manganese:

There are multiple possible stable ions. Signup and view all the answers

Name the following compound: Fe2O3

Iron (III) oxide Signup and view all the answers

Calculate the moles of oxygen atom in 1.00 × 10^27 O2 molecules

6.64 × 10^3 Signup and view all the answers

A compound contains 82.66% C and 17.34% H by mass. Which of the following is the empirical formula of the compound?

C2H4 Signup and view all the answers

Balance the equation for following photosynthesis reaction. What is the correct coefficient for C (s)? Fe3O4 (s) + C (s) → Fe (s) + CO2 (g)

4 Signup and view all the answers

In the unbalanced reaction below: H2 (g) + O2 (g) → H2O (g) What is the mass of water generated when 15.0 g O2 is consumed?

16.9 g Signup and view all the answers

In an acid-base reaction, 15.0 g sulfuric acid is mixed with 20.0 g potassium hydroxide. In this reaction,

Potassium hydroxide is the limiting reactant. Signup and view all the answers

Sodium hydroxide solution can absorb carbon dioxide by the reaction below. When 35.0 g CO2 (g) is bubbled into a solution containing 95.0 g NaOH, how many grams of sodium carbonate will be obtained? 2 NaOH (aq) + CO2 (g) → Na2CO3 (aq) + H2O (l)

84.3 g Signup and view all the answers

When performing scuba diving, it is dangerous for a diver if they ascend quickly without breathing multiple times. When a diver is at a depth of 25 meters, the air pressure in lung is approximately 2.50 atm, and the volume of air in lung is 5.00 L. If the diver surface immediately without breathing (without changing the amount of air in lung) where the air pressure is 1.00 atm, how will the volume of air change in lung?

It expands to 10.0 L, causing rupture to lung tissues and muscles. Signup and view all the answers

A chemistry reactor with a constant volume of 1.0 L is sealed with an internal pressure of 350.0 psi at 27.0 °C. When the reactor is heated to 120 °C, what will the pressure become?

458 psi Signup and view all the answers

A chemistry reactor with a constant volume of 3.35 L is sealed. The reactor is filled with 6.00 mol oxygen gas at 27.0 °C. What is the pressure of this reactor?

44.1 atm Signup and view all the answers

Hydrazine (N2H4) is used as a rocket propellant in certain cases. The combustion reaction is: N2H4 (l) + O2 (l) → N2 (g) + 2 H2O (g) A small test rocket is filled with 32.00 kg hydrazine and 36.00 kg oxygen. The combustion of the propellent releases massive amount of heat, with a temperature of 2500 °C and a pressure of 40.0 atm for the gas produced. After the complete combustion of the propellent, what is the total volume of nitrogen produced under this condition?

5.68 × 10^3 L Signup and view all the answers

A patient is prescribed for 150 mg of a drug to be administered by IV injection. The drug manufacturer advised the drug to be delivered at a concentration of 0.50 g/L. What volume of IV pack should be used for the drug?

0.33 L Signup and view all the answers

Which of the statements below is not correct regarding acid ionization constant Ka?

To write the expression of Ka, water should not be included. Signup and view all the answers

A solution has a pH value of 4.53 at 25 °C. What is the concentration of hydroxide in this solution?

3.4 × 10^-10 M Signup and view all the answers

Match the following programming languages with their primary usage:

Python = General-purpose programming JavaScript = Client-side scripting for web applications SQL = Database queries CSS = Styling web pages Signup and view all the answers

Study Notes

Exam Instructions

The exam has 28 questions, each worth 1 point.
It's a closed-book exam; notes, papers, and electronic devices are not allowed.
Do not turn the pages before instructed.
Do not continue writing after instructed to stop.
Answer in the designated area; answers outside the area may not be graded.
For multiple choice, use a pencil to fully darken the bubble. Erase completely if needing to change an answer. Only bubble one answer per question. Unbubbled or incorrect bubbles may not receive credit.

Chemistry Concepts (Page 2)

Significant Figures: Calculation 16 + 33.35 / 5.2 = 9.5
Periodic Table: Nonmetals are not limited to Groups 1 and 2. Elements in the same group share similar properties. Noble gases (Group 18) are largely inert under normal conditions. Transition metals are in the center (Groups 3-12).
Electrolytes: Strong electrolytes completely dissociate into ions in water, weak electrolytes partially dissociate, and higher concentrations of non-electrolytes don't increase conductivity. Conductivity depends on the extent of ionization/dissociation.
Plane Descent: A plane descending at 2200 feet per minute descends 72 meters in one second. (2,200 feet/min * 1min/60sec* 0.3048meters/foot = 11 meters/sec)

Chemistry Concepts (Page 3)

Chemical Compounds: Fe₂O₃ is Iron (III) oxide, PCl₅ is Phosphorus pentachloride.
Moles of Oxygen: 1.00 × 10²⁷ 0₂ molecules contain 1.66 × 10²³ oxygen atoms. (1.00 x 10^27 molecules * 2 atoms O/ molecule * 1.66 X 10^-23 atoms/ mol)
Empirical Formula: A compound with 82.66% carbon and 17.34% hydrogen has an empirical formula of C₂H₄.

Chemistry Concepts (Page 4)

Mass of Water: 15.0 g of O₂ results in the formation of 16.9 g of water. (15g O2/ 16g O2/mole O2/2 moles H2)
Limiting Reactants: Insufficient information is provided to determine the limiting reactant in a reaction of 15.0 grams of sulfuric acid mixed with 20.0 grams of potassium hydroxide.
Sodium Carbonate: In the reaction of 35.0 g of CO₂ and 95.0 g of NaOH, 84.3 g of sodium carbonate will be produced.
Scuba Diving: Ascent can impact lung pressure; the volume of air increases.

Chemistry Concepts (Page 5)

Pressure Change: A 1.0-L reactor with an initial internal pressure of 350.0 psi at 27.0 °C will have a pressure of 458 psi at 120 °C.
Oxygen Gas Pressure: The pressure in a 3.35-L reactor with filled with 6.00 moles of oxygen gas at 27.0 °C is 44.1 atm.
Nitrogen Volume: A reaction of 32.00 kg of hydrazine (N₂H₄) and 36.00 kg of oxygen (O₂) produces a total volume of nitrogen of 5.77 x 10³ L.
IV Injection: 150 mg of the drug requires 0.30 L of the IV pack.

Chemistry Concepts (Page 6)

Solubility Rules: Most alkali metal and ammonium compounds are soluble; nitrates and acetates are generally soluble. Most sulfates are soluble, with exceptions. Chlorides, bromides, and iodides are mostly soluble, with a few exceptions. Silver compounds (except AgNO₃ and AgClO₄) are mostly insoluble. Oxides and hydroxides are mostly insoluble, with exceptions for alkali metals and some alkaline earth metals. Sulfides are mostly insoluble, with exceptions. Chromates are mostly insoluble, and carbonates, phosphates, sulfites, and silicates are usually insoluble, with exceptions for Na+, K+, and NH₄+.
Reaction of Ions: Ag+, NO₃⁻, K⁺, Cl⁻ ions in solution will NOT react.

Chemistry Concepts (Page 7)

Equilibrium Constant: The equilibrium constant (K) expression for a reaction may vary based on the balanced equation. The addition of a catalyst will not change the equilibrium constant in a chemical equation.
Methanol Synthesis: The synthesis of methanol through a reversible reaction can be influenced by changing the temperature, volume, and reactant concentration.
Acids and Bases: In the reaction of HPO4⁻(aq) + H₂O(l) = H₂PO₄⁻ (aq) + OH⁻(aq), the H₂PO₄⁻ is the conjugate acid of the HPO4⁻2. The HPO4⁻2 acts as a Brønsted-Lowry base.

Chemistry Concepts (Page 8)

Acid Ionization Constant: Different acids have different acid ionization constants (Kₐ values). A stronger acid has a larger Kₐ value. Polyprotic acids (like carbonic acid) often have successively smaller Kₐ values for the stepwise loss of protons. Water concentration is not included in the calculations of Kₐ.
Hydroxide Concentration: A solution with pH 4.53 at 25 °C has a hydroxide concentration of 3.0 x 10⁻¹⁰ M.

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Description

Test your understanding of significant figures, the periodic table, and electrolytes in this chemistry concepts quiz. Each question will challenge your knowledge and application of these foundational topics. Prepare to demonstrate your skills in a closed-book format.