Will Be On The Quiz Atoms & Isotopes
Isotopes are atoms of the same element that contain different numbers of neutrons and thus have different mass numbers. The test below was prepared to help you get an idea of thaw to expect in the quiz that is coming up on atoms. Give it a shot and all the best!
Questions and Answers
- 1.
Came up with the idea that all matter is made up of tiny particles called atoms
- A.
Chadwick
- B.
Aristotle
- C.
Democritus
- D.
Odysseus
Correct Answer
C. DemocritusExplanation
Democritus is the correct answer because he was the philosopher who first proposed the concept that all matter is composed of small, indivisible particles called atoms. This idea was revolutionary at the time and laid the foundation for modern atomic theory. Chadwick, Aristotle, and Odysseus are not associated with this concept and therefore are not the correct answers.Rate this question:
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- 2.
Aristotle believed that all matter is made up of which 4 elements
- A.
Earth, glass, rock, fire
- B.
Wind, water, fire, earth
- C.
Electricity, fire, earth, rock
- D.
Water, wind, sun, trees
Correct Answer
B. Wind, water, fire, earthExplanation
Aristotle believed that all matter is made up of the four elements: wind, water, fire, and earth. He proposed that these elements combine and transform to create all substances in the physical world. This concept of the four elements was influential in ancient Greek philosophy and continued to shape scientific thinking for centuries.Rate this question:
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- 3.
JJ Thompson discovered __________.
- A.
Electron
- B.
Proton
- C.
Neutron
- D.
Isotope
Correct Answer
A. ElectronExplanation
JJ Thompson discovered the electron.Rate this question:
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- 4.
Rutherford discovered the nucleus using which experiment
- A.
Cathode ray
- B.
Bohr model
- C.
Gold foil
- D.
Plum pudding
Correct Answer
C. Gold foilExplanation
Rutherford discovered the nucleus using the gold foil experiment. In this experiment, Rutherford directed a beam of alpha particles at a thin sheet of gold foil. According to the prevailing plum pudding model, the positive charge in an atom was thought to be spread evenly throughout the atom. However, Rutherford's observations showed that some alpha particles were deflected at large angles, and a few even bounced back. This led him to conclude that the positive charge and most of the mass of an atom were concentrated in a small, dense region called the nucleus, which was surrounded by mostly empty space.Rate this question:
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- 5.
Rutherford and Chadwick discovered both _______________ & ___________
Correct Answer
Protons & Electrons
Protons & Quarks
Nucleus & Neutrons
Protons & NeutronsExplanation
Rutherford and Chadwick discovered both protons and neutrons. They conducted experiments that led to the discovery of the nucleus of an atom, which contains protons and neutrons. Additionally, Rutherford's gold foil experiment provided evidence for the existence of the positively charged particles called protons. However, electrons were not discovered by Rutherford and Chadwick, but rather by J.J. Thomson through his experiments with cathode rays. Quarks were not discovered by Rutherford and Chadwick either, but by Murray Gell-Mann and George Zweig in the 1960s.Rate this question:
- 6.
Atoms of the same element have different numbers of neutrons, which changes the mass of an atom
- A.
Quark
- B.
Idotope
- C.
Neutrons
- D.
Isotope
Correct Answer
D. IsotopeExplanation
Isotopes are atoms of the same element that have different numbers of neutrons. Neutrons are subatomic particles that contribute to the mass of an atom. Therefore, when the number of neutrons in an atom changes, the mass of the atom also changes. This is because neutrons have a mass of approximately one atomic mass unit (amu). So, the presence of different isotopes of an element leads to variations in the mass of the atoms of that element.Rate this question:
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- 7.
Explain each of the following laws1. Law of Conservation of Mass2.Law of Multiple Proportions3. Law of Definite proprtions
- 8.
The atomic number of an element tells us the number of protons and neutrons in a specific isotope
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The atomic number of an element only tells us the number of protons in the nucleus, not the number of neutrons. The number of neutrons can vary for different isotopes of the same element. Therefore, the statement is false.Rate this question:
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- 9.
The atomic number is the number of protons in the nucleus and also identifies the element
- A.
False
- B.
True
Correct Answer
B. TrueExplanation
The statement is true because the atomic number of an element is indeed the number of protons in its nucleus. Each element has a unique atomic number, which determines its position on the periodic table and identifies the element. Therefore, the statement accurately describes the relationship between the atomic number, protons, and element identification.Rate this question:
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- 10.
Atoms cannot be subdivided, created, or destroyed
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement "atoms cannot be subdivided, created, or destroyed" is not true. Atoms can indeed be subdivided into smaller particles, such as protons, neutrons, and electrons. Additionally, atoms can be created or destroyed through various processes, such as nuclear reactions or radioactive decay. Therefore, the correct answer is False.Rate this question:
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- 11.
If you have two different isotopes of the same element will have the same atomic number?
- A.
Yes
- B.
No
Correct Answer
A. YesExplanation
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The atomic number of an element represents the number of protons in its nucleus. Since isotopes of the same element have the same number of protons, their atomic numbers will be the same. Therefore, the correct answer is "Yes".Rate this question:
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- 12.
What does the acronym "amu" stand for?
- A.
Average mass unit
- B.
Atomic mole unit
- C.
Atomic mass unit
Correct Answer
C. Atomic mass unitExplanation
The acronym "amu" stands for atomic mass unit. This unit is used to measure the mass of atoms and molecules. It is defined as one-twelfth the mass of a carbon-12 atom. The atomic mass unit is commonly used in chemistry and physics to express the relative masses of atoms and molecules.Rate this question:
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