What is Dalton's Atomic Theory?

Exploring Atomic Models

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7th Grade
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15 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Atoms are the smallest units of matter and cannot combine with others.
Atoms can be created and destroyed in chemical reactions.
Dalton's Atomic Theory is a scientific theory that describes the nature of matter as being composed of atoms, which are indivisible and combine in fixed ratios to form compounds.
All matter is made up of molecules, not atoms.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
List the main postulates of Dalton's Atomic Theory.
Atoms can be created and destroyed in reactions.
All matter is composed of molecules.
Atoms of the same element can have different charges.
1. All matter is composed of atoms. 2. Atoms are indivisible and indestructible. 3. Atoms of a given element are identical in mass and properties. 4. Atoms of different elements differ in mass and properties. 5. Compounds are formed by the combination of different atoms in fixed ratios. 6. Chemical reactions involve the rearrangement of atoms.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What did Thomson's Plum Pudding Model propose about atoms?
Electrons are the only components of atoms.
Atoms are made entirely of positively charged particles.
Atoms consist of a solid core surrounded by a cloud of protons.
Atoms consist of a positively charged 'pudding' with negatively charged electrons embedded in it.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How did Thomson discover the electron?
Thomson discovered the electron by observing the deflection of cathode rays in a vacuum tube.
Thomson discovered the electron by studying the behavior of light in a prism.
Thomson discovered the electron by analyzing the properties of metals.
Thomson discovered the electron through chemical reactions in a lab.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the significance of the nucleus in Bohr's Model?
The nucleus contains only neutrons and has no effect on electron attraction.
The nucleus is responsible for the movement of electrons around the atom.
The nucleus provides the positive charge that attracts electrons and defines the structure of the atom.
The nucleus is a source of energy that powers the atom's reactions.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Describe the main features of Bohr's Model of the Atom.
Electrons are located in a cloud around the nucleus.
Energy levels are continuous and not quantized.
Bohr's Model features a central nucleus, fixed electron orbits, quantized energy levels, and photon emission/absorption during electron transitions.
The nucleus is composed of only electrons.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the Quantum Mechanical Model of the atom emphasize?
The fixed orbits of electrons around the nucleus.
The existence of protons and neutrons only.
The ability of electrons to be in multiple places at once.
The probabilistic nature of electron positions and behaviors.
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