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Ch.7 - Periodic Properties of the Elements
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232당신이 사용하는 게 아니라요?교과서 변경
7장, 문제 90c

The ionic substance strontium oxide, SrO, forms from the reaction of strontium metal with molecular oxygen. The arrangement of the ions in solid SrO is analogous to that in solid NaCl:
(c) The density of SrO is 5.10 g>cm3. Given your answer to part (b), how many formula units of SrO are contained in the cube shown here?

검증된 단계별 안내
1
Identify the volume of the cube using the given density of SrO and the mass of the cube.
Use the formula for density, \( \text{Density} = \frac{\text{Mass}}{\text{Volume}} \), to find the mass of the cube if not given.
Calculate the volume of the cube using the side length if provided, or rearrange the density formula to find the volume.
Determine the molar mass of SrO by adding the atomic masses of strontium (Sr) and oxygen (O).
Use Avogadro's number to convert the mass of SrO in the cube to the number of formula units, using the relationship between moles, mass, and molar mass.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
5m

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Ionic Compounds

Ionic compounds, such as strontium oxide (SrO), are formed through the transfer of electrons from metals to nonmetals, resulting in the formation of positively charged cations and negatively charged anions. In SrO, strontium donates two electrons to oxygen, creating Sr²⁺ and O²⁻ ions. The electrostatic attraction between these oppositely charged ions leads to the formation of a crystalline lattice structure, which is characteristic of ionic compounds.
추천 영상:
가이드 코스
02:11
Ionic Compounds Naming

Density and Volume Calculations

Density is defined as mass per unit volume (density = mass/volume) and is a crucial property for understanding the arrangement of particles in a substance. In the context of the question, knowing the density of SrO allows us to calculate the mass of SrO in a given volume, which can then be used to determine the number of formula units present in that volume. This relationship is essential for solving problems involving the quantification of substances in chemistry.
추천 영상:
가이드 코스
01:56
Density Concepts

Unit Cell and Formula Units

A unit cell is the smallest repeating unit in a crystal lattice that reflects the symmetry and structure of the entire crystal. In ionic solids like SrO, the unit cell contains a specific number of formula units, which can be determined based on the arrangement of ions. Understanding how to relate the volume of the unit cell to the number of formula units is key to answering questions about the composition of solid ionic compounds.
추천 영상:
가이드 코스
01:27
Simple Cubic Unit Cell
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교과서 질문

The ionic substance strontium oxide, SrO, forms from the reaction of strontium metal with molecular oxygen. The arrangement of the ions in solid SrO is analogous to that in solid NaCl: (a) Write a balanced equation for the formation of SrO(s) from its elements.

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교과서 질문

(a) Use orbital diagrams to illustrate what happens when an oxygen atom gains two electrons

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In the chemical process called electron transfer, an electron is transferred from one atom or molecule to another. (We will talk about electron transfer extensively in Chapter 20.) A simple electron transfer reaction is A(g) + A(g) → A+(g) + A-(g) For a representative nonmetal such as chlorine, is this process exothermic?

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교과서 질문

The ionic substance strontium oxide, SrO, forms from the reaction of strontium metal with molecular oxygen. The arrangement of the ions in solid SrO is analogous to that in solid NaCl:

(b) Based on the ionic radii in Figure 7.8, predict the length of the side of the cube in the figure (the distance from the center of an atom at one corner to the center of an atom at a neighboring corner).

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Explain the variation in the ionization energies of carbon, as displayed in this graph:

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