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Quizzes > Science > Chemistry

Practice Regents Chemistry Questions - Start the Quiz!

Kickstart Your Prep with a Free Regents Chemistry Practice Test!

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art chemistry quiz with test tubes molecule models periodic table and Regents chemistry title on dark blue background

Ready to tackle practice regents questions chemistry and boost your confidence for the big day? This engaging regents chemistry quiz online challenges your understanding, sharpens problem-solving, and highlights your strengths and gaps. You'll even review key topics like atomic structure, chemical bonding, and stoichiometry with exam-style items. Whether you're gearing up for ny regents chemistry practice or aiming for a top score on our comprehensive regents chemistry practice test, you'll get instant feedback and valuable tips. Dive into our chemistry regents practice exercises, explore official strategies with chemistry regents examinations , and reinforce key concepts with a chemistry regents flashcards review. Ready to ace it? Start now!

Which subatomic particle has a negative charge?
Neutron
Positron
Proton
Electron
Electrons carry a negative charge and orbit the nucleus of an atom. Protons are positively charged, neutrons are neutral, and positrons are the antimatter counterparts to electrons with a positive charge. Understanding subatomic charges is fundamental to chemistry concepts such as bonding and conductivity. ChemLibreTexts
What is the formula for sodium chloride?
ClNa
NaCl2
NaCl
Na2Cl
Sodium (Na) has a +1 charge and chloride (Cl) has a ?1 charge, so they combine in a 1:1 ratio to form NaCl. This yields an electrically neutral ionic compound. The formula reflects the simplest whole-number ratio of the ions. Chemicool
At STP, one mole of an ideal gas occupies what volume?
22.4 L
24.0 L
1.0 L
0.0821 L
Standard temperature and pressure (0°C and 1 atm) conditions define the molar volume of an ideal gas as 22.4 L. This value is derived from the ideal gas law (PV=nRT). It is used frequently in stoichiometric calculations involving gases. LibreTexts
What is the oxidation state of oxygen in H2O?
?2
+1
?1
0
In most compounds, oxygen has an oxidation state of ?2. In water, each hydrogen has +1, so to balance two hydrogens (+2 total), oxygen must be ?2. This convention helps in balancing redox reactions. MasterClass
Which process represents the physical change from gas to liquid?
Evaporation
Ionization
Condensation
Sublimation
Condensation is the phase change from a gas to a liquid when vapor loses energy. Evaporation is the reverse, liquid to gas. Sublimation is solid to gas, and ionization refers to forming ions. Understanding these helps explain weather phenomena and industrial processes. Sciencing
What is the pH of a neutral aqueous solution at 25°C?
14
7
1
0
pH is the negative logarithm of hydrogen ion concentration. At 25°C, pure water has [H?]=1×10?? M, giving a pH of 7. This is defined as neutral on the pH scale of 0 to 14. Britannica
How many molecules are in 2 moles of CO2?
3.01×10^23
1.204×10^24
1.204×10^23
6.02×10^22
Avogadro's number (6.02×10²³) is the number of particles per mole. For 2 moles, multiply by 2 to get 1.204×10²? molecules. This constant underpins mole-to-particle conversions. LibreTexts
Which formula represents a covalent compound?
NaCl
CO2
CaCl2
KBr
Covalent compounds form between nonmetals sharing electrons. CO? involves carbon and oxygen, both nonmetals. Ionic compounds like NaCl involve metal and nonmetal ions. Recognizing these distinguishes bonding types. Chemicool
What mass of NaOH is required to prepare 250 mL of a 0.10 M solution?
0.25 g
1.00 g
10.0 g
2.50 g
Molarity (M) is moles per liter. 0.250 L × 0.10 mol/L = 0.025 mol NaOH. The molar mass of NaOH is approximately 40.0 g/mol, so 0.025×40.0 = 1.0 g. ChemTeam
Which of the following is the correct empirical formula of a compound with 40% C, 6.7% H, and 53.3% O by mass?
C2H4O2
C3H6O3
CHO2
CH2O
Assume 100 g sample: 40 g C (3.33 mol), 6.7 g H (6.63 mol), 53.3 g O (3.33 mol). Divide by smallest (3.33) to get ratios 1:2:1, giving CH?O. Empirical formula shows simplest ratio. Purdue
A gas occupies 5.0 L at 1.0 atm. What will its pressure be at 2.0 L if temperature is constant?
10 atm
0.40 atm
1.0 atm
2.5 atm
Boyle's law states P?V?=P?V? for constant temperature. (1.0 atm×5.0 L)/2.0 L =2.5 atm. Doubling pressure halves volume. LibreTexts
Which molecule has a trigonal planar geometry?
CH4
H2O
BF3
NH3
BF? has three bonding pairs around boron and no lone pairs, giving trigonal planar geometry. NH? is trigonal pyramidal, H?O is bent, CH? is tetrahedral. VSEPR theory predicts shapes based on electron pairs. LibreTexts
In a titration of 25.0 mL of 0.10 M HCl with 0.10 M NaOH, what is the pH at the equivalence point?
8.7
14
7
1
Strong acid - strong base titrations reach equivalence at pH 7 because the resulting solution is neutral (NaCl in water). Neither ion hydrolyzes to change pH. This is characteristic of strong acid - strong base titrations. Chemguide
Which one of the following molecules exhibits hydrogen bonding?
HF
HCl
HI
HBr
Hydrogen bonding occurs when H is bonded to highly electronegative atoms like F, O, or N. HF forms strong hydrogen bonds. HCl, HBr, and HI do not form significant hydrogen bonds because Cl, Br, and I are less electronegative. LibreTexts
What is the rate law for a reaction that is second order with respect to A and zero order with respect to B?
Rate=k[A]^2
Rate=k[A]
Rate=k[A][B]
Rate=k[B]^0
If a reaction is second order in A (exponent 2) and zero order in B, the rate law is Rate = k[A]²[B]^0. B^0 equals 1, so it does not affect rate. The rate law shows how concentration changes affect reaction speed. Chemguide
Calculate the pH of a buffer solution containing 0.1 M acetic acid and 0.1 M sodium acetate. (pKa of acetic acid = 4.76)
5.76
3.76
4.76
7.00
Using Henderson - Hasselbalch: pH = pKa + log([A?]/[HA]) = 4.76 + log(1) = 4.76. Equal concentrations of acid and conjugate base give pH equal to pKa. Buffer calculations are essential in analytical chemistry. LibreTexts
Which half-reaction occurs at the cathode in an electrochemical cell?
Reduction of Cu²? to Cu
Oxidation of Cu to Cu²?
Reduction of Zn²? to Zn
Oxidation of Zn to Zn²?
The cathode is where reduction occurs; electrons are gained. Cu²? + 2e? ? Cu is a reduction half-reaction. Zn ? Zn²? + 2e? is oxidation at the anode. This distinction is fundamental to electrochemistry. Chemguide
What is the equilibrium constant (Kc) expression for the reaction: N2(g) + 3H2(g) ? 2NH3(g)?
[N2][H2]^3/[NH3]^2
[NH3]^2/[N2][H2]^3
[NH3]/[N2][H2]^3
[N2][H2]/[NH3]^2
For aA + bB ? cC, Kc = [C]^c/([A]^a[B]^b). Here a=1,b=3,c=2. So Kc = [NH?]²/([N?][H?]³). The expression predicts reaction direction and yield. LibreTexts
Which process increases entropy the most?
Condensation of a gas
Formation of a liquid solution
Sublimation of a solid
Freezing of a liquid
Entropy increases with disorder. Sublimation converts a solid to gas, giving maximum molecular freedom. Freezing and condensation decrease disorder. Recognizing entropy changes is key in thermodynamics. LibreTexts
In a galvanic cell, the cell potential is 1.10 V. If the reaction quotient Q = 0.01, what can be said about ?G? (R=8.314 J/mol·K, T=298 K, n=2, F=96485 C/mol)
?G is negative
Cannot determine
?G is positive
?G is zero
?G = ?nFEcell + RT ln Q. Since Ecell is positive and Q<1, ln Q is negative, making RT ln Q negative. The sum remains negative, so ?G is negative. This indicates spontaneity. LibreTexts
Which graph correctly represents the potential energy vs reaction coordinate for an endothermic reaction?
Flat line
Products same as reactants
Products higher than reactants
Products lower than reactants
Endothermic reactions absorb energy, so products end at higher potential energy than reactants. The activation energy hump remains above reactants. Energy diagrams visualize energy changes. Chemguide
Which element has the highest electronegativity?
Oxygen
Chlorine
Nitrogen
Fluorine
Electronegativity increases across a period and decreases down a group. Fluorine, at top right of the periodic table, has the highest value. This property influences bond polarity and reactivity. LibreTexts
Which molecular orbital diagram explains why O2 is paramagnetic?
It has unpaired electrons in bonding orbitals only
It has two unpaired electrons in antibonding orbitals
Its bonding orbitals are empty
It has all electrons paired
O? has the configuration with two unpaired electrons in the ?* antibonding orbitals, causing paramagnetism. Paired electrons in bonding orbitals would yield diamagnetism. Molecular orbital theory predicts magnetic properties. LibreTexts
In an SN1 reaction mechanism, what is the rate-determining step?
Leaving group departure after attack
Nucleophile attack
Formation of the carbocation intermediate
Proton transfer
In SN1 mechanisms, the slow, rate-determining step is the unimolecular formation of a carbocation when the leaving group departs. Nucleophile attack is faster once the carbocation is formed. This two-step process is characteristic of SN1. Chemguide
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Study Outcomes

  1. Balance Chemical Equations -

    Demonstrate the ability to balance chemical equations accurately, ensuring the law of conservation of mass is upheld in every reaction scenario.

  2. Analyze Reaction Rates -

    Evaluate how concentration, temperature, and catalysts influence reaction rates, and apply these principles to solve practice Regents chemistry questions.

  3. Apply Regents Chemistry Concepts -

    Use core topics such as atomic structure, periodic trends, and mole calculations to tackle regents chemistry practice test problems effectively.

  4. Interpret Experimental Data -

    Read and analyze tables, graphs, and charts commonly found in NY Regents chemistry practice materials to draw accurate conclusions.

  5. Reinforce Knowledge with Instant Feedback -

    Utilize instant scoring and feedback to identify strengths and target areas for improvement, building confidence for the actual Regents chemistry quiz.

Cheat Sheet

  1. Balancing Redox Reactions with the Half-Reaction Method -

    Use the half-reaction approach endorsed by NYSED to separate and balance oxidation and reduction steps before recombining them, a staple in regents chemistry practice test materials. For example, balance MnO4❻ + Fe²❺ → Mn²❺ + Fe³❺ in acidic solution by equalizing electrons transferred. Practicing this method on practice regents questions chemistry builds confidence for your Regents chemistry quiz online.

  2. Mastering the Combined Gas Law -

    The Combined Gas Law (P₝V₝/T₝ = P₂V₂/T₂) unifies Boyle's, Charles's, and Gay-Lussac's laws into one formula for sample changes. Plug in initial and final pressures (P), volumes (V), and absolute temperatures (T) to solve problems quickly during your NY Regents chemistry practice sessions. Visualizing gas behavior through animations on a regents chemistry quiz online can reinforce this concept.

  3. Interpreting Rate Laws and Collision Theory -

    Memorize that Rate = k[A]^m[B]^n and determine orders (m, n) experimentally, as highlighted in university kinetics modules and Regents chemistry practice test guidelines. Recall "slow step controls rate," meaning the rate-determining step's molecularity appears in the rate law. Try sample problems or chemistry regents flashcards review to identify first- vs. second-order reactions confidently.

  4. Using the Henderson-Hasselbalch Equation for Buffers -

    Apply pH = pKa + log([A❻]/[HA]) to calculate buffer pH and design solutions that resist pH shifts, a frequent question in NY regents chemistry practice. For instance, determine the pH of a 0.1 M acetic acid/acetate buffer (pKa = 4.76) by plugging concentrations into the equation. Regular chemistry regents flashcards review can help you remember key pKa values.

  5. Leveraging Mnemonics for Periodic Trends -

    Use the mnemonic "FONClBrISCHP" to recall electronegativity order (F > O > N > Cl > Br > I > S > C > H > P) and remember that atomic radius decreases across a period while ionization energy increases. Refer to NCERT or ACS periodic tables, as recommended in regents chemistry practice test resources, to visualize trends. Flashcards and digital quizzes make ny regents chemistry practice more interactive when mastering these patterns.

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