問 1
1 点Calculate the relative formula mass (
\(M_r \)) of magnesium nitrate,
\(Mg(NO_3)_2 \).
(Relative atomic masses:
\(Mg = 24, N = 14, O = 16 \))
Pearson Edexcel IGCSE · Science (Single Award)
Principles of chemistry：練習問題
その場で採点される選択問題 4 問と、解説つきの記述問題 5 問。すべて「Principles of chemistry」からの出題です。
9 問29 点無料・登録不要
問 2
1 点2.3 g of sodium ( \(Na \)) reacts completely with 3.55 g of chlorine ( \(Cl_2 \)) to form sodium chloride ( \(NaCl \)). If the relative atomic mass of Na is 23 and Cl is 35.5, what is the empirical formula of sodium chloride?
問 3
1 点Which statement correctly describes the formation of a covalent bond between two atoms?
問 4
1 点An atom of element X has 17 protons, 18 neutrons, and 17 electrons. Which of the following statements is true regarding element X?
問 5
3 点State the definition of an isotope and provide an example.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 6
6 点Compare and contrast the bonding and structure of a typical metal with a giant covalent structure like silicon dioxide.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 7
4 点Describe the arrangement and movement of particles in a liquid.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 8
4 点The atom is the fundamental building block of all matter, composed of subatomic particles.
(a) Describe the location, relative mass, and relative charge of the three main subatomic particles found in an atom.
(b) An element has an atomic number of 17 and a mass number of 35. Determine the number of protons, neutrons, and electrons in a neutral atom of this element.
(c) Explain what is meant by isotopes, using an example to illustrate your answer. How do isotopes of the same element differ, and how are they similar?
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 9
8 点An element X consists of two main isotopes. One isotope has a mass number of 35 and an abundance of 75.0%. The other isotope has a mass number of 37 and an abundance of 25.0%.
(a) State what is meant by the term isotopes in terms of sub-atomic particles. (2 points)
(b) Calculate the relative atomic mass (\(A_r\)) of element X based on the isotopic data provided. Show your working. (2 points)
(c) Element X reacts with element Y (from Group 1 of the Periodic Table) to form an ionic compound. Describe the process of ionic bonding between X and Y in terms of electron transfer and electrostatic attractions. (3 points)
(d) Explain why the compound formed between X and Y has a high melting point. (1 point)
まず自分で答えを書いてから、解説と照らし合わせましょう。
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