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Grade 12 Chemistry Basics (Mixed) Worksheet with Answers

Grade 12 (US) · Year 13 (UK) · Class 12 (India) · Chemistry

Unit 5: ReviewMixed Chemistry Review

A mixed set on atoms, elements, compounds and chemical reactions. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Chemistry Basics (Mixed)

Grade 12 · Chemistry

Score___ / 12

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Class

Date

Learning goal: Mixed Chemistry Review

Directions: This worksheet has 2 parts. Read the instructions at the start of each part.

Example

Is rusting a physical change or a chemical change?

Answer: a chemical change

RememberAtoms, elements and compounds

H₂O2 hydrogen atoms (the small 2)1 oxygen atom (no number = 1)Atomsmallest pieceElementone kind of atom: OMoleculeatoms bonded: O₂Compounddifferent elements: CO₂Mixturenot bonded: salt water
Part A

Match each clue to the right word. Write the letter in the box.

  1. 1What number on the periodic table tells you the number of protons?
  2. 2What do we call a reaction that releases heat?
  3. 3What gas is produced when vinegar reacts with baking soda?
  4. 4What is the chemical formula for oxygen gas?
  5. 5What do we call atoms of the same element with different numbers of neutrons?
  6. 6Is baking a cake a physical change or a chemical change?
  • AIsotopes
  • BCarbon dioxide
  • CAtomic number
  • DO₂
  • EExothermic
  • FChemical change
Part B

Answer each question. Use full sentences where you can.

  1. 7

    Where are electrons found in an atom?

  2. 8

    Can a compound be separated by physical methods like filtering?

  3. 9

    How many atoms of each element are in one molecule of CO₂?

  4. 10

    Why is a neutral atom uncharged overall?

  5. 11

    How many atoms in total are in one molecule of glucose, C₆H₁₂O₆?

  6. 12

    What do we call a substance made of only one type of atom?

★ Challenge corner for fast finishers

On the Moon (no air), a hammer and a feather are dropped together. Which lands first?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/chemistry/12/chemistry_basics

Answer key (click to show)
  1. 1.C — the atomic number
  2. 2.E — exothermic
  3. 3.B — carbon dioxide
  4. 4.D — O₂
  5. 5.A — isotopes
  6. 6.F — a chemical change
  7. 7.in shells (energy levels) around the nucleus
  8. 8.no, it needs a chemical reaction; mixtures can be separated physically
  9. 9.1 carbon and 2 oxygen
  10. 10.it has the same number of protons and electrons
  11. 11.24
  12. 12.an element
  13. ★they land at the same time (challenge corner)

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