Quiz Chemical Kenetics and Chemical Reactions

Which of the following statements best describes the difference between an element and a compound?

• Elements are composed of two or more atoms bonded together, while compounds contain only one type of atom

• Compounds cannot be broken down into simpler substances by chemical means, while elements can

• Elements are pure substances consisting of only one type of atom, while compounds are substances made from two or more types of atoms chemically bonded together

• Compounds are found on the periodic table, while elements are not.

What is the molar mass of CO₂ (carbon dioxide)?

(Use the following atomic masses: C = 12.01 g/mol, O = 16.00 g/mol)

• 28.01 g/mol

• 32.01 g/mol

• 44.01 g/mol

• 48.01 g/mol

Which of the following correctly describes how the concentration of a solution is calculated?

• By dividing the amount (in moles) of solute by the volume (in liters) of solution

• By dividing the mass of solute by the mass of solvent

• By dividing the volume of solute (in liters) by the volume of solvent

• By multiplying the volume of solute (in liters) by the volume of solution

Which of the following represents a single replacement reaction?

• HCl + NaOH → NaCl + H₂O

• 2H₂ + O₂ → 2H₂O

• AgNO₃ + NaCl → AgCl + NaNO₃

• Zn + 2HCl → ZnCl₂ + H₂

Which of the following is a mixture of both man-made and naturally occurring compounds?

• Table salt (NaCl) — naturally occurring only

• Pure water (H₂O) — naturally occurring only

• Air — contains a mix of gases, some of which are man-made and some naturally occurring

• Carbon dioxide (CO₂) — both naturally occurring and man-made

What does the Michaelis-Menten equation describe in enzyme kinetics?

• It describes the rate of non-enzymatic reactions based on temperature

• It explains how pH levels affect the reactivity of enzyme structures

• It measures the energy required to initiate a chemical reaction in enzyme systems

• It models the rate of enzyme-catalyzed reactions based on substrate concentration

How many moles of water are in 36 grams of H₂O?

(Use: molar mass of H₂O = 18.02 g/mol)

• 1 mole

• 2 mole

• 3 moles

• 4 moles

Tags

NGSS.HS-PS1-7

Which of the following best describes a synthesis reaction?

• A single compound breaks into two or more simpler substances

• An element replaces another in a compound

• Two or more reactants combine to form a single product

• Compounds exchange parts to form new compounds

Why is water known as the “universal solvent”?

• It can dissolve many polar and ionic substances due to its polarity

• It dissolves metals easily

• It dissolves all types of substances

• It is nonpolar and interacts with all compounds equally

Tags

NGSS.HS-ESS2-5

If a solution has [H⁺] = 1 × 10⁻³ M, what is the pH?

• 2

• 2.3

• 3

• 3.5