T2.1.1 Dalton atomic model Quiz: KS3 Chemistry, Unit 2

The 20 questions

1. In Dalton's atomic model, what is an atom?

   • A tiny solid sphere that cannot be divided
   • A particle that changes into other atoms in reactions
   • A nucleus surrounded by orbiting protons
   • A cloud of negative charge with no solid centre

2. According to Dalton's model, what is true of all atoms of the same element?

   • They vary in mass depending on where they are found
   • They always contain different numbers of protons
   • They are all identical in mass and properties
   • They can change into atoms of other elements

3. According to Dalton, how do atoms of different elements differ?

   • They are made of the same material
   • They change size when heated
   • They can be split into smaller particles of the same kind
   • They have different masses and properties

4. What did Dalton propose about compounds?

   • Compounds contain only one type of atom, which is repeated in a random number
   • Atoms of compounds are never joined together and remain separate particles
   • Atoms of different elements combine in fixed whole-number ratios
   • Compounds have atoms that change their identity as the substances are mixed

5. Which statement would Dalton's model NOT support?

   • Atoms of an element are all the same
   • Atoms cannot be created or destroyed in reactions
   • Atoms contain smaller particles called electrons
   • Atoms combine in simple whole-number ratios

6. Why was Dalton's model important?

   • It showed that atoms are mostly empty space with a tiny dense nucleus at the centre
   • It gave a simple particle-based explanation of elements, compounds and reactions
   • It proved that atoms contain protons and neutrons inside a dense central nucleus
   • It explained why atoms are electrically neutral by showing equal charges inside them

7. In Dalton's model, what happens to atoms in a chemical reaction?

   • They split into electrons and protons, which then combine in new ways
   • They are rearranged into new combinations but not destroyed
   • They are destroyed and new atoms are created to make the new products
   • They change into atoms of a different element during the course of the reaction

8. Dalton's model is described as simple because it:

   • shows atoms as mostly empty space surrounded by a cloud of electrons
   • includes a detailed nucleus with protons and neutrons packed together
   • describes atoms as tiny, indivisible spheres
   • explains radioactive decay of unstable atoms in a useful way

9. A student uses Dalton's model to explain why 2 hydrogen atoms and 1 oxygen atom combine to make water. Which statement is consistent with the model?

   • Atoms in water have no fixed ratio, so the water could contain any amount
   • Oxygen atoms split into hydrogen atoms when water is formed in the reaction
   • Water atoms are made only of electrons, so they carry no fixed mass at all
   • Atoms combine in a fixed ratio to form a compound

10. Which feature of Dalton's model explains why compounds have fixed proportions of elements?

    • Atoms can change their mass during reactions, depending on the temperature used
    • Atoms of each element have a fixed mass and combine in fixed ratios
    • Atoms of the same element vary in size, so the proportions also vary greatly
    • Atoms are mostly empty space with no fixed ratio between the elements present

11. A chemist finds that a compound always contains twice as many atoms of element X as element Y. Which idea from Dalton's model explains this?

    • Atoms of X are heavier than atoms of Y, so there are more of them
    • Atoms combine in fixed whole-number ratios
    • Elements mix randomly with no pattern
    • Atoms of X can change into Y during the reaction

12. Dalton's model does not explain which of these?

    • Why atoms are conserved in reactions, so that total mass stays the same
    • Why atoms have a positive charge in a nucleus
    • Why compounds have fixed ratios of atoms, as shown in many experiments
    • Why atoms of one element have the same mass as one another in every sample

13. Which statement about atoms in Dalton's model is correct?

    • Atoms of different elements are identical
    • Atoms always lose mass when they react
    • Atoms cannot be broken into smaller particles by chemical reactions
    • Atoms can be broken into smaller particles in every chemical reaction

14. What is an element according to the particle idea that Dalton used?

    • A solid that contains molecules of water
    • A substance made of two or more types of atom
    • A substance made only of one type of atom
    • A mixture of atoms that can be separated by filtration

15. A student says gold and iron atoms are the same because both are metals. Which Dalton-based reply is correct?

    • They are different because gold atoms have a negative charge and iron atoms do not
    • They are different elements, so their atoms have different masses and properties
    • They are the same because both are solid at room temperature
    • They are the same because all metals have identical atoms

16. Which claim of Dalton's model was later found to be a limitation?

    • Atoms contain smaller particles such as protons, neutrons and electrons
    • Atoms are conserved in chemical reactions, so their total mass never changes
    • Atoms of the same element have the same mass in every sample that is tested
    • Atoms combine in simple whole-number ratios when they form compounds in reactions

17. Why was the discovery of subatomic particles a challenge to Dalton's model?

    • Atoms were shown to have no mass at all, which made them impossible to weigh
    • Atoms were shown to be divisible into smaller particles
    • Atoms were shown to be made only of hydrogen atoms joined together in pairs
    • Atoms were shown to combine randomly, with no fixed ratio in any compound

18. Why did Dalton's ideas help chemists predict the products of reactions?

    • Atoms change at random, so no prediction is possible about the products formed
    • Atoms always produce a gas when they react, so the product is always known
    • Atoms of each element are different sizes, so the products cannot be predicted at all
    • Atoms combine in known fixed ratios, so the formula of a product can be predicted

19. Which statement is consistent with Dalton's atomic model?

    • Elements can be split into atoms of other elements simply by heating them strongly
    • Compounds always contain atoms of only one element, joined in a random pattern
    • Two different elements can combine to form compounds with fixed ratios of atoms
    • Atoms of an element vary widely in mass, so each sample has different atoms

20. Which of these was NOT a claim of Dalton's model?

    • Atoms of each element have the same mass as one another in every sample
    • Atoms join in fixed whole-number ratios to form compounds in every reaction
    • Atoms contain a nucleus made of protons and neutrons
    • Atoms are indivisible in chemical reactions and cannot be broken apart by heat

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