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Gridlocks: 101 printable chemistry puzzles

  • 2 Puzzles for 11-14 year olds: from acids to states of matter
  • 3 Puzzles for 14-16 year olds: from atoms to units of volume
  • 4 Puzzles for 16-18 year olds: from aqueous ions to subshells

101 sudoku-style chemistry puzzles with printable worksheets and answers to engage your students and consolidate their knowledge about key topics

Gridlocks are a fun and stimulating way for students to learn the facts they need in chemistry. Discover 101 printable puzzles with answer sheets, covering core topics for ages 11–14, 14–16 and 16+.

Download the puzzles for each age group below, or read on to find out:

  • How gridlock puzzles work
  • How you can use the puzzles in your teaching
  • What your students can learn

Download the puzzles

Browse, print and download the puzzles for your students’ age group:

11–14 years | 14 –16 years | 16–18 years

Each download includes a series of puzzles focusing on a particular topic, with a printable student worksheet and answers.

How do gridlock puzzles work?

  • Students begin by filling in a table to review the key ideas they need to complete the puzzles. The table contains information about a group of objects, concepts or things related to the chosen topic. To complete the table, students identify items in this group or match them with further information, data or examples.
  • After filling in the table, students use this information to complete the gridlock puzzles that follow in the worksheet.

Completing the puzzles

  • Each puzzle features a 4 x 4 grid divided into rows, columns and four 2 x 2 boxes.
  • The objective is to fill in the grid using information from the table at the top of the worksheet, so that each row, column and 2 x 2 box contains only one reference to any single item (or row) from the table.
  • Each 2 x 2 box is labelled using headings from the information table. These headings tell students what type of information should be used in that box.
  • Each puzzle includes instructions telling students whether to use the whole information table, or only a part of it.

How can I use these puzzles in my teaching?

You can use gridlock puzzles during lessons or set them as homework. They are designed as follow up activities to consolidate students’ knowledge, rather than as introductions to a topic. Ideally, students should have met at least some of the data the gridlock puzzles are based on already.

The worksheets are simple to set and can readily be peer or self assessed. During lessons, the puzzles can be used flexibly as part of an individual, group or class-based activity. You can also add an extra element of competition or challenge. For example, set a target time and invite students to try to beat the clock, or encourage groups of students to see who can solve the most.

What will my students learn?

Topic knowledge.

Each puzzle focuses on a topic appropriate to 11–14, 14–16 or 16–18 year old students. To solve the puzzle, students need to engage with the factual information the gridlock is based on, recalling the relationships between ideas and data established in the first part of the activity. For example, they need to recall that three electron pairs corresponds to trigonal planar geometry, or that sulfuric acid forms sulfate salts.

As they work on the puzzles, students will find themselves referring to the initial data repeatedly, gradually consolidating their knowledge of the relevant facts.

Problem-solving and thinking skills

Gridlock puzzles give students a problem-solving context for their learning, promoting engagement and offering students a sense of satisfaction in completing the grid. The puzzles also develop some important thinking skills, as students must use logical reasoning to survey the data given in the gridlock and determine which squares can be filled in.

Additional information

This resource was originally part of the Gridlocks microsite, produced by the Royal Society of Chemistry with support from the Wolfson Foundation.

A collage of screenshots of completed gridlock puzzles

Puzzles for 11-14 year olds: from acids to states of matter

A screenshot showing a completed gridlock puzzle, with a grid containing the names and formulas of four alkanes

Puzzles for 14-16 year olds: from atoms to units of volume

A screenshot showing a completed gridlock puzzle, with a grid containing information about hybrid orbitals in molecular geometry

Puzzles for 16-18 year olds: from aqueous ions to subshells

  • 11-14 years
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  • 16-18 years
  • Elements and the periodic table
  • Equations, formulas and nomenclature

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Chemistry Problems

Use chemistry problems as a tool for mastering chemistry concepts. Some of these examples show using formulas while others include lists of examples.

Acids, Bases, and pH Chemistry Problems

Learn about acids and bases. See how to calculate pH, pOH, K a , K b , pK a , and pK b .

  • Practice calculating pH.
  • Get example pH, pK a , pK b , K a , and K b calculations.
  • Get examples of amphoterism.

Atomic Structure Problems

Learn about atomic mass, the Bohr model, and the part of the atom.

  • Practice identifying atomic number, mass number, and atomic mass.
  • Get examples showing ways to find atomic mass.
  • Use Avogadro’s number and find the mass of a single atom .
  • Review the Bohr model of the atom.
  • Find the number of valence electrons of an element’s atom.

Chemical Bonds

Learn how to use electronegativity to determine whether atoms form ionic or covalent bonds. See chemistry problems drawing Lewis structures.

  • Identify ionic and covalent bonds.
  • Learn about ionic compounds and get examples.
  • Practice identifying ionic compounds.
  • Get examples of binary compounds.
  • Learn about covalent compounds and their properties.
  • See how to assign oxidation numbers.
  • Practice drawing Lewis structures.
  • Practice calculating bond energy.

Chemical Equations

Practice writing and balancing chemical equations.

  • Learn the steps of balancing equations.
  • Practice balancing chemical equations (practice quiz).
  • Get examples finding theoretical yield.
  • Practice calculating percent yield.
  • Learn to recognize decomposition reactions.
  • Practice recognizing synthesis reactions.
  • Practice recognizing single replacement reactions.
  • Recognize double replacement reactions.
  • Find the mole ratio between chemical species in an equation.

Concentration and Solutions

Learn how to calculate concentration and explore chemistry problems that affect chemical concentration, including freezing point depression, boiling point elevation, and vapor pressure elevation.

  • Get example concentration calculations in several units.
  • Practice calculating normality (N).
  • Practice calculating molality (m).
  • Explore example molarity (M) calculations.
  • Get examples of colligative properties of solutions.
  • See the definition and examples of saturated solutions.
  • See the definition and examples of unsaturated solutions.
  • Get examples of miscible and immiscible liquids.

Error Calculations

Learn about the types of error and see worked chemistry example problems.

  • See how to calculate percent.
  • Practice absolute and relative error calculations.
  • See how to calculate percent error.
  • See how to find standard deviation.
  • Calculate mean, median, and mode.
  • Review the difference between accuracy and precision.

Equilibrium Chemistry Problems

Learn about Le Chatelier’s principle, reaction rates, and equilibrium.

  • Solve activation energy chemistry problems.
  • Review factors that affect reaction rate.
  • Practice calculating the van’t Hoff factor.

Practice chemistry problems using the gas laws, including Raoult’s law, Graham’s law, Boyle’s law, Charles’ law, and Dalton’s law of partial pressures.

  • Calculate vapor pressure.
  • Solve Avogadro’s law problems.
  • Practice Boyle’s law problems.
  • See Charles’ law example problems.
  • Solve combined gas law problems.
  • Solve Gay-Lussac’s law problems.

Some chemistry problems ask you identify examples of states of matter and types of mixtures. While there are any chemical formulas to know, it’s still nice to have lists of examples.

  • Practice density calculations.
  • Identify intensive and extensive properties of matter.
  • See examples of intrinsic and extrinsic properties of matter.
  • Get the definition and examples of solids.
  • Get the definition and examples of gases.
  • See the definition and examples of liquids.
  • Learn what melting point is and get a list of values for different substances.
  • Get the azeotrope definition and see examples.
  • See how to calculate specific volume of a gas.
  • Get examples of physical properties of matter.
  • Get examples of chemical properties of matter.
  • Review the states of matter.

Molecular Structure Chemistry Problems

See chemistry problems writing chemical formulas. See examples of monatomic and diatomic elements.

  • Practice empirical and molecular formula problems.
  • Practice simplest formula problems.
  • See how to calculate molecular mass.
  • Get examples of the monatomic elements.
  • See examples of binary compounds.
  • Calculate the number of atoms and molecules in a drop of water.

Nomenclature

Practice chemistry problems naming ionic compounds, hydrocarbons, and covalent compounds.

  • Practice naming covalent compounds.
  • Learn hydrocarbon prefixes in organic chemistry.

Nuclear Chemistry

These chemistry problems involve isotopes, nuclear symbols, half-life, radioactive decay, fission, fusion.

  • Review the types of radioactive decay.

Periodic Table

Learn how to use a periodic table and explore periodic table trends.

  • Know the trends in the periodic table.
  • Review how to use a periodic table.
  • Explore the difference between atomic and ionic radius and see their trends on the periodic table.

Physical Chemistry

Explore thermochemistry and physical chemistry, including enthalpy, entropy, heat of fusion, and heat of vaporization.

  • Practice heat of vaporization chemistry problems.
  • Practice heat of fusion chemistry problems.
  • Calculate heat required to turn ice into steam.
  • Practice calculating specific heat.
  • Get examples of potential energy.
  • Get examples of kinetic energy.
  • See example activation energy calculations.

Spectroscopy and Quantum Chemistry Problems

See chemistry problems involving the interaction between light and matter.

  • Calculate wavelength from frequency or frequency from wavelength.

Stoichiometry Chemistry Problems

Practice chemistry problems balancing formulas for mass and charge. Learn about reactants and products.

  • Get example mole ratio problems.
  • Calculate percent yield.
  • Learn how to assign oxidation numbers.
  • Get the definition and examples of reactants in chemistry.
  • Get the definition and examples of products in chemical reactions.

Unit Conversions

There are some many examples of unit conversions that they have their own separate page!

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1 05 quiz problem solving in chemistry

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Chemistry Steps

Chemistry Steps

Hess's law state function diagram explanation

General Chemistry

Thermochemistry.

In this set of practice questions, we will go over the main types of questions on calorimetry including the heat capacity, the heat of reaction, finding the final temperature of a mixture, constant pressure calorimetry, and constant-volume calorimetry.

A few important concepts and formulas you will need to solve these questions. 

Heat capacity and specific heat are correlated by the following formula: 

1 05 quiz problem solving in chemistry

When solving a problem related to heat capacity and heat transfer, remember that most of the time, it is assumed the heat is not lost, and it only flows from the object with a higher temperature to the colder one:

1 05 quiz problem solving in chemistry

The heat transfer to/from the calorimeter is determined by its temperature change and the heat capacity:

q cal  = C cal  x Δ T

The heat capacity of the calorimeter is determined experimentally and is already known when measuring the heat/enthalpy of a reaction.

Remember, the enthalpy change  ( Δ H)  is equal to the heat  when the  pressure is constant :

1 05 quiz problem solving in chemistry

On the other hand, a bomb calorimeter  is an equipment that measures  Δ E  for combustion reactions . This can be seen in the equation of internal energy change:

Δ E = q + w

w =  P Δ V  and Δ V  is zero when the volume is constant. So, for a constant volume,  Δ E  =  q , and therefore, the  bomb calorimeter measures the energy change  of a chemical reaction.

1 05 quiz problem solving in chemistry

The experiment is carried out in an insulated sealed vessel called a  bomb  which is designed to withstand high pressures. The bomb is placed in a water container and by measuring its temperature change caused by the reaction, we determine the heat of the calorimeter.

1 05 quiz problem solving in chemistry

The links to the corresponding topics are given below:

  • Energy Related to Heat and Work
  • Endothermic and Exothermic Processes
  • Heat Capacity and Specific Heat
  • Heat Capacity Practice Problems
  • What is Enthalpy
  • Constant-Pressure Calorimetry
  • Bomb calorimeter – Constant Volume Calorimetry
  • Stoichiometry and Enthalpy of Chemical Reactions
  • Hess’s Law and Enthalpy of Reaction
  • Hess’s Law Practice Problems
  • Standard Enthalpies of Formation
  • Enthalpy of Reaction from Enthalpies of Formation

How much heat in kJ is required to warm 1.50 L of water from 25.0 o C to 100.0 °C? (Assume a density of 1.0 g/mL for the water.)

What is the final temperature when a 40 g sample of water at 90 °C is mixed with a 60 g sample at 25 °C?

How much heat does it take to increase the temperature of a 540.6-g sample of Fe from 20.0 °C to 84.3 °C? The specific heat of iron = 0.450 J/g °C.

Calculate the specific heat capacity of a metal if a 17.0 g sample requires 481 J to change the temperature of the metal from 25.0 °C to 67.0 °C?

Calculate the energy of combustion for one mole of butane if burning a 0.367 g sample of butane (C 4 H 10 ) has increased the temperature of a bomb calorimeter by 7.73 °C. The heat capacity of the bomb calorimeter is 2.36 kJ/ °C.

How many joules of energy is required to melt 40.0 g of ice at 0 °C? The heat of fusion (Δ H fus ) for ice is 334.0 J/g.

How many kJ of energy does it take to change 36.0 g of ice at -15.0 °C to water at 0. °C ? The specific heat of ice is 2.10 J/g°C and the heat of fusion (Δ H fus ) for ice is 334.0 J/g. Ignore the significant figures for this problem.

The enthalpy change for the reaction is given below:

2CH 3 OH( l ) + 3O 2 ( g ) → 4H 2 O( l ) + 2CO 2 ( g ) Δ H = -1452.8 kJ

a) What quantity of heat is released for each mole of water formed?

b) What quantity of heat is released for each mole of oxygen reacted?

How much heat will be released if 44.8 g of SO 2  is reacted with an excess of oxygen according to the following chemical equation?

2SO2( g ) + O 2 ( g ) → 2SO 3 ( g ), Δ H ° = –198 kJ

What is Δ H ° for the following reaction

2C 6 H 6 ( l ) + 15O 2 ( g ) → 12CO 2 ( g ) + 6H 2 O( l ), Δ H ° = ? kJ

if the consumption of 27.3 g of benzene (C 6 H 6 ) produces 1144 kJ of heat?

Based on the heat of reaction for the chlorination of methane, how much heat will be released if 233.6 grams of hydrochloric acid are formed?

CH 4 ( g ) + 3Cl 2 ( g ) → CHCl 3 ( l ) + 3HCl( g ), Δ H ° = -334 kJ

Calculate how many kJ of heat-energy will be released when 12.65 g of magnesium carbonate reacts with 650. mL of 0.400  M  hydrochloric acid?

MgCO 3 ( s )   +   2HCl( aq )    →    MgCl 2 ( aq )   +   H 2 O( l )   +   CO 2 ( g ), Δ H °   =   –112   kJ

2 thoughts on “Calorimetry Practice Problems”

This was so helpful,thank you so much!

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