A particle model of chemical reactions

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Waxaan sawiri karaa jaantusyada walxaha ee falceliyeyaasha iyo badeecadaha si aan u muujiyo sida ay u habaynayaan falcelinta kiimikada.

Introduction

In this lesson: I can draw particles diagrams of reactants and products to show how they are rearranged by a chemical reaction. Reactants are the chemicals that react in a chemical reaction. Products are the chemicals that are formed in a chemical reaction.

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Reactants are the chemicals that react in a chemical reaction. Products are the chemicals that are formed in a chemical reaction. The products and reactants in a chemical reaction contain exactly the same atoms. The atoms in the products of a chemical reaction are bonded differently to the same atoms in the reactants.

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Quizzes

1. Which of these is true about elements?
- They can have variable boiling points
- Correct answer:They are organised in the Periodic Table
- They are always compounds
- They don't react with other elements
2. What of the following is an example of a molecular element?
- Si
- Correct answer:O₂
- Na
3. What indicates a compound in a chemical formula?
- Presence of a single element
- No subscripts (little numbers)
- Correct answer:Multiple different elemental symbols
- Only gases

1. In a chemical reaction, what happens to the atoms?
- New atoms are created.
- Some atoms are destroyed.
- Correct answer:They are rearranged.
2. In the chemical equation 2H₂ + O₂ → 2H₂O, what are the reactants?
- H₂O
- Correct answer:H₂ and O₂
- H₂ only
- O₂ only
- H₂O and O₂
3. Which of the following is a characteristic of a chemical reaction?
- Changes in state
- Loss of atoms
- Correct answer:formation of new substances
- Gain of atoms
4. After the reaction 2H₂ + O₂ → 2H₂O, what happens to the total number of atoms?
- It increases.
- It decreases.
- Correct answer:It remains the same.
- Not enough information is known, so it cannot be determined.
- Different reaction conditions would lead to different answers.
5. In the equation 2Na + Cl₂ → 2NaCl, what is the simplest ratio of sodium (Na) atoms to chlorine (Cl) atoms in the reactants?
- Correct answer:1:1
- 2:1
- 1:2
- 2:2
- 3:1

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