18 Questions
What was the plum pudding model of the atom?
Atom is a ball of positive charge with negative electrons embedded in it.
Describe the findings of the alpha particle scattering experiment.
The experiment concluded that the mass of an atom was concentrated at the centre (nucleus) and that the nucleus was charged.
What is the smallest part of an element that can exist?
Atom
According to Neil Bohr, how do electrons behave in an atom?
Bohr suggested electrons orbit the nucleus at specific distances.
How are compounds different from mixtures?
Compounds are chemically combined, while mixtures are not chemically combined.
What did James Chadwick's work contribute to the atomic model?
Chadwick's work provided evidence for the existence of neutrons within the nucleus.
What process can be used to separate mixtures that involve physical processes, not chemical reactions?
Filtration, crystallisation, simple distillation, fractional distillation, and chromatography.
How can compounds be separated into elements?
By chemical reactions.
What is the difference between compounds and mixtures?
Compounds are chemically combined in fixed proportions, while mixtures are not chemically combined and can be separated by physical processes.
Explain the concept of chemical symbols in relation to atoms.
Chemical symbols represent atoms of elements, for example, Na represents an atom of sodium.
How can compounds be separated into elements?
Compounds can be separated into elements by chemical reactions.
In what way do mixtures differ from compounds in terms of separation methods?
Mixtures can be separated by physical processes like filtration, crystallisation, simple distillation, fractional distillation, and chromatography, while compounds can only be separated by chemical reactions.
What does a compound contain and how is it represented?
A compound contains two or more elements chemically combined in fixed proportions and is represented by formulae using the symbols of the atoms from which they were formed.
What was the key conclusion drawn from the alpha particle scattering experiment?
The mass of an atom was concentrated at the centre (nucleus) and that the nucleus was positively charged.
How did Neil Bohr contribute to the model of the atom?
He suggested that electrons orbit the nucleus at specific distances.
What did later experiments reveal about the positive charge in a nucleus?
The positive charge of any nucleus could be subdivided into a whole number of smaller particles, each having the same amount of positive charge (protons).
How did James Chadwick's work contribute to the atomic model?
He provided evidence for the existence of neutrons within the nucleus.
What is the significance of the atomic number of an element?
The atomic number is the number of protons in an atom of an element. All atoms of a particular element have the same number of protons.
Learn about the basic concepts of atoms, elements, and compounds. Understand how atoms make up elements, how chemical symbols represent elements, and how compounds are formed from elements through chemical reactions.
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