Chemistry Worksheet - KS3 - Intermediate

Chemistry worksheet for Key Stage 3 / Year 7-9 (Ages 11-14). Intermediate level science practice, aligned to the UK National Curriculum. Print-ready with answer key included.

Science•Key Stage 3 / Year 7-9 (Ages 11-14)•Chemistryintermediate

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Exploring Chemistry: Intermediate Concepts

Key Stage 3 / Ages 11-14 / Intermediate Level

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Instructions: This worksheet will guide you through various chemistry concepts, including atomic structure, the periodic table, and chemical reactions. Work through each activity carefully, using the guidance provided to deepen your understanding.

Understanding Atomic Structure

Review the atomic structure of elements. For each element, identify the number of protons, neutrons, and electrons. Use the periodic table for reference.

1. Helium: Protons , Neutrons , Electrons

2. Carbon: Protons , Neutrons , Electrons

3. Oxygen: Protons , Neutrons , Electrons

4. Sodium: Protons , Neutrons , Electrons

Periodic Table Exploration

Use the periodic table to explore the properties of elements. Identify the group and period for each element listed.

1. Hydrogen: Group , Period

2. Chlorine: Group , Period

3. Argon: Group , Period

4. Potassium: Group , Period

Chemical Bonding Types

Identify the type of chemical bonding present in the following compounds. Write 'ionic', 'covalent', or 'metallic' in the boxes provided.

1. NaCl

2. H₂O

3. Fe

4. CO₂

Balancing Chemical Equations

Balance the following chemical equations. Ensure that the number of atoms for each element is equal on both sides of the equation.

1. H₂ + O₂ → H₂O

2. N₂ + H₂ → NH₃

3. C₃H₈ + O₂ → CO₂ + H₂O

4. Fe + O₂ → Fe₂O₃

Understanding pH and Acidity

Identify whether the following substances are acidic, neutral, or basic. Use the pH scale as a reference.

1. Lemon juice (pH 2)

2. Pure water (pH 7)

3. Soap solution (pH 10)

4. Vinegar (pH 3)

Investigating States of Matter

Describe the state of matter for each substance at room temperature and explain the particle arrangement.

1. Water

2. Carbon dioxide

3. Iron

4. Helium

Identifying Reaction Types

Classify each of the following reactions as combination, decomposition, displacement, or combustion.

1. 2H₂ + O₂ → 2H₂O

2. 2HgO → 2Hg + O₂

3. Zn + CuSO₄ → ZnSO₄ + Cu

4. CH₄ + 2O₂ → CO₂ + 2H₂O

Exploring the Rock Cycle

Describe the processes involved in the rock cycle. Use the terms 'weathering', 'erosion', 'sedimentation', 'metamorphism', and 'melting' to complete the cycle.

1. Weathering and erosion lead to

2. Sedimentation forms

3. Metamorphism transforms rocks into

4. Melting results in

Answer Key

Activity 1: Helium - 2 ; 2 ; 2 ; Carbon - 6 ; 6 ; 6 ; Oxygen - 8 ; 8 ; 8 ; Sodium - 11 ; 12 ; 11

Activity 2: Hydrogen - 1 ; 1 ; Chlorine - 7 ; 3 ; Argon - 0 ; 3 ; Potassium - 1 ; 4

Activity 3: NaCl - ionic ; H₂O - covalent ; Fe - metallic ; CO₂ - covalent

Activity 4: H₂ + ½O₂ → H₂O ; N₂ + 3H₂ → 2NH₃ ; C₃H₈ + 5O₂ → 3CO₂ + 4H₂O ; 4Fe + 3O₂ → 2Fe₂O₃

Activity 5: Lemon juice - acidic ; Pure water - neutral ; Soap solution - basic ; Vinegar - acidic

Activity 6: Water - liquid ; Carbon dioxide - gas ; Iron - solid ; Helium - gas

Activity 7: Combination ; Decomposition ; Displacement ; Combustion