8th Grade Chemistry Test: Ultimate Quiz
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Hydrogen is located in what group of the periodic table?
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Group 2
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Group 3
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Group 1
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Group 4
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Have you learned chemistry well during school? To test your knowledge, take this chemistry quiz for class 8. Can you pass this 8th-grade chemistry test? Chemistry is the study of matter and its properties. One way to understand chemistry is to pay close attention to different elements, atoms, and chemical processes. What are electrons? In this quiz, you will get to show just how much you understand atoms and the atomic numbers of different elements. Take up the task and see how well you do!
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- 2.
The atomic number for hydrogen is?
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1
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2
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3
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4
Correct Answer
A. 1Explanation
The atomic number for an element represents the number of protons in its nucleus. Hydrogen has an atomic number of 1, indicating that it has one proton. This is the smallest possible atomic number, as hydrogen is the lightest element on the periodic table.Rate this question:
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- 3.
What is the complete reaction between an acid and a base called?
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Sedimentation
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Crystallization
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Neutralization
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Evaporation
Correct Answer
A. NeutralizationExplanation
The reaction between an acid and a base is called neutralization. This process involves the combination of hydrogen ions from the acid and hydroxide ions from the base, resulting in the formation of water and a salt. The term "neutralization" is used because the resulting solution is neither acidic nor basic, but rather neutral in nature. This reaction is commonly used in various applications, such as in the production of fertilizers, pharmaceuticals, and household cleaning products.Rate this question:
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- 4.
How many electron shells does oxygen have?
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1
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2
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3
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4
Correct Answer
A. 2Explanation
Oxygen has two electron shells. The electron shells are energy levels or orbits where electrons are found around the nucleus of an atom. The first shell can hold a maximum of 2 electrons, while the second shell can hold a maximum of 8 electrons. Since oxygen has 8 electrons, it fills the first shell with 2 electrons and the second shell with 6 electrons. Therefore, the correct answer is 2. You can easily tell that oxygen has two electron shells since oxygen is in the second row of the period table in the p-block.Rate this question:
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- 5.
How many neutrons are present in 1 atom of chlorine-35?
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18
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32
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16
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25
Correct Answer
A. 18Explanation
Chlorine has an atomic number of 17, which represents the number of protons in its nucleus. The atomic mass of chlorine is approximately 35.5, and chlorine-35 is a common isotope. Since the atomic mass is the sum of protons and neutrons, we can subtract the atomic number from the atomic mass to find the number of neutrons. Therefore, 35 - 17 = 18 neutrons are present in 1 atom of chlorine.Rate this question:
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- 6.
Oxygen is best described as a?
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Rare Element
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Noble Gas
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Halogen
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Nonmetal
Correct Answer
A. NonmetalExplanation
Oxygen is best described as a nonmetal because it is a chemical element that lacks metallic properties. Nonmetals are typically poor conductors of heat and electricity, have low melting and boiling points, and tend to gain or share electrons in chemical reactions. Oxygen fits these characteristics as it is a gas at room temperature, does not conduct electricity, and readily forms covalent bonds with other elements.Rate this question:
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- 7.
What term describes the chemical processes that occur in cells to release energy?
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Oxidation
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Cellular Respiration
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Perspiration
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Nutrition
Correct Answer
A. Cellular RespirationExplanation
Cellular Respiration is the correct answer because it is the chemical process that occurs in cells to release energy. During respiration, glucose is broken down in the presence of oxygen to produce ATP (adenosine triphosphate), which is the energy currency of the cell. This process occurs mainly in the mitochondria of the cell and is essential for the survival and functioning of all living organisms.Rate this question:
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- 8.
Chlorine has how many electron shells?
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5
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7
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2
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3
Correct Answer
A. 3Explanation
Chlorine has three electron shells. The electron shells are the energy levels or orbitals where electrons are found in an atom. Chlorine has an atomic number of 17, which means it has 17 electrons. These electrons are distributed among the three electron shells, with the first shell holding a maximum of 2 electrons, the second shell holding a maximum of 8 electrons, and the third shell holding the remaining 7 electrons. Therefore, chlorine has three electron shells. You can easily tell that chlorine has three electron shells because it is in the third row of the period table in the p-block.Rate this question:
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- 9.
There are how many valence electrons in a neutral oxygen atom?
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3
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8
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12
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6
Correct Answer
A. 6Explanation
The neutral oxygen atom has 6 valence electrons. Valence electrons are the electrons in the outermost energy level of an atom, and they are responsible for the atom's chemical properties and ability to form bonds with other atoms. In the case of oxygen, the electron configuration is 1s2 2s2 2p4, meaning there are 2 electrons in the 1s orbital, 2 electrons in the 2s orbital, and 4 electrons in the 2p orbital. The 2s and 2p orbitals are considered the valence orbitals, so there are a total of 6 valence electrons in a neutral oxygen atom.Rate this question:
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- 10.
There are how many electrons in 1 neutral atom of copper?
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18
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29
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34
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26
Correct Answer
A. 29Explanation
Copper is an element with atomic number 29, which means it has 29 protons in its nucleus. In a neutral atom, the number of electrons is equal to the number of protons. Therefore, there are 29 electrons in 1 neutral atom of copper.Rate this question:
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Oct 24, 2024Quiz Edited by
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