Chemistry Quiz For 11 Year Old
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How many neutrons are in potassium-40?
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19
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40
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21
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27
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Test your knowledge with this chemistry quiz created for an 11-year-old student. Chemistry is a subject that can make you go insane with its formulas and rules. However, it is one of the most entertaining subjects if you study correctly and understand it. The quiz here may cover Isotopes, Lewis diagrams, naming compounds, balancing equations, and other things. Make sure See moreyou try your best and get a very good score. Best of luck to you!
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- 2.
What is the electron configuration for Sulphur?
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(2, 8, 7)
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(2, 6, 5)
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(2, 8, 6)
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(2, 6, 8)
Correct Answer
A. (2, 8, 6)Explanation
The electron configuration for an atom indicates the arrangement of electrons in its energy levels. Sulphur has an atomic number of 16, meaning it has 16 electrons. The electron configuration of Sulphur is 1s2 2s2 2p6 3s2 3p4. This can be simplified as (2, 8, 6), which represents the number of electrons in each energy level.Rate this question:
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- 3.
What are the coefficients for the following equation when it is balanced? ___SiO2 + ___HF --> ___SiF4 + ___H2O
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2, 3, 2, 2
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1, 4, 1, 2
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2, 4, 1, 3
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1, 3, 2, 3
Correct Answer
A. 1, 4, 1, 2Explanation
The balanced equation is 1 SiO2 + 4 HF -> 1 SiF4 + 2 H2O. This means that for every 1 molecule of SiO2, 4 molecules of HF are required to produce 1 molecule of SiF4 and 2 molecules of H2O.Rate this question:
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- 4.
How is a mixture different from a compound?
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Particles of a mixture are combined chemically.
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Components of a mixture can be separated by physical means.
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Components of a mixture can only be separated chemically.
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The composition of a mixture may be constant.
Correct Answer
A. Components of a mixture can be separated by physical means.Explanation
A mixture is different from a compound because the components of a mixture can be separated by physical means. In a mixture, the different substances are combined together but they retain their individual properties and can be easily separated. This is in contrast to a compound where the elements are chemically bonded together and cannot be separated by physical means. The ability to separate the components of a mixture is a key characteristic that distinguishes it from a compound.Rate this question:
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- 5.
Potassium is a chemical element with which symbol?
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P
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T
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S
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K
Correct Answer
A. KExplanation
Potassium is a chemical element that is represented by the symbol K. This symbol is derived from the Latin word "kalium." Potassium is an essential mineral for the human body and is involved in various physiological processes. It is commonly found in bananas, potatoes, and other fruits and vegetables.Rate this question:
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- 6.
If a certain mixture is homogeneous, you would properly conclude that the physical properties and the composition are:
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Vary smoothly from top to bottom of the sample
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Are different from one part of the sample to another
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Are the same in every small volume element of the sample
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None of these
Correct Answer
A. Are the same in every small volume element of the sampleExplanation
If a certain mixture is homogeneous, it means that the components are evenly distributed throughout the sample. This implies that the physical properties and composition of the mixture will be the same in every small volume element of the sample. Therefore, the correct answer is "are the same in every small volume element of the sample."Rate this question:
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- 7.
What is the most correct Lewis Diagram for Helium?
Correct Answer
A.Explanation
Potassium-40 is an isotope of potassium, which means it has the same number of protons but a different number of neutrons. The atomic number of potassium is 19, indicating that it has 19 protons. The atomic mass of potassium-40 is 40, so subtracting the number of protons (19) from the atomic mass gives us the number of neutrons. Therefore, there are 21 neutrons in potassium-40.Rate this question:
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- 8.
Name this compound: Hint: this is the reaction between a non-metal and a non-metal
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Nitrogen oxide
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Dinitrogen tetroxide
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Tetraoxygen dinitride
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Oxygen nitride
Correct Answer
A. Dinitrogen tetroxideExplanation
Dinitrogen tetroxide is the correct answer because it is a compound formed by the reaction between two non-metals, nitrogen and oxygen. The prefix "di-" indicates that there are two nitrogen atoms, and the name "tetroxide" indicates that there are four oxygen atoms. Therefore, the compound is correctly named as dinitrogen tetroxide.Rate this question:
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- 9.
What is the name for the compound CuOH?
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Copper hydroxide
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Copper(I) hydrogen oxide
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Copper(I) hydroxide
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Copper hydrogen oxide
Correct Answer
A. Copper(I) hydroxideExplanation
The correct answer is Copper(I) hydroxide. This compound is named using the Stock system for naming compounds with transition metals. In this system, the Roman numeral in parentheses indicates the oxidation state of the metal ion, which in this case is copper(I) or cuprous. The hydroxide ion (OH-) is a polyatomic ion, so its name remains unchanged. Therefore, the compound is named Copper(I) hydroxide.Rate this question:
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- 10.
Balance the following: ___BF3 + ___Li2SO3 + ___B2(SO3)3 + ___LiF What will the coefficients be for the balanced reaction?
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2, 4, 1, 5
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1, 2, 1, 3
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2, 3, 1, 6
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1, 3, 2, 6
Correct Answer
A. 2, 3, 1, 6Explanation
The balanced reaction for the given equation is 2BF3 + 3Li2SO3 + B2(SO3)3 + 6LiF. This is determined by ensuring that the number of atoms of each element is the same on both sides of the equation. In this case, by adjusting the coefficients, we can see that there are 2 boron (B) atoms, 6 fluorine (F) atoms, 3 lithium (Li) atoms, and 1 sulfur (S) atom on both sides of the equation. Therefore, the coefficients for the balanced reaction are 2, 3, 1, and 6.Rate this question:
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