Chemistry Homework Help

Browse Homework Solutions

73 solutions

Unit Cell

Q. Calcium is a nontoxic metal that is used in supplements to maintain strong bones. Under high pressure conditions, over about 320,000 atm, it has a simple cubic unit cell. How many atoms of Ca are present in each unit cell?

Solved • Jan 28, 2020

Unit Cell

Q. Which of the following is correct for the unit cell shown below: a) Four atoms per unit cell b) Most efficient c) Edge length = 2r d) Coordination number = 8

Solved • Jan 27, 2020

Unit Cell

Q. Which type of packing is shown by the layer representation given below: a) Face-centered cubic b) Cubic closet packing c) Hexagonal d) Cubic closet packing or face-centered cubic.

Solved • Jan 27, 2020

Unit Cell

Q. The face-centered gold crystal has an edge length of 407 pm. Based on the unit cell, calculate the density of gold. Express your answer numerically in grams per cubic centimeter.

Solved • Jan 27, 2020

Unit Cell

Q. The atoms of crystalline solid pack together into a three-dimensional array to many small repeating units called units cells. The simplest of the unit cells are those that have cubic symmetry, with atoms positioned at the corners of a cube. Atoms can also be found in the sides (faces) of the cube, or centered within the body of the cube. It is important to realize that a unit cell is surrounded by other unit cells in every direction. Therefore, face and corner atoms are shared whith neighboring unit cells. The fraction varies with the typed of atom as shown in the followingn table. The size of a unit cell in any given solid can be calculated by using its density. This and the reverse calculation are common test equation in general chemistry courses. Identify the three types of unit cells shown. Drag the item to the appropriate bin.

Solved • Jan 27, 2020

Unit Cell

Q. Gallium crystallizes in a primitive cubic unit cell. The length of an edge of this cube if 362pm. What is the radius of a gallium atom? Express your answer numerically in picometers.

Solved • Jan 27, 2020

Unit Cell

Q. You are a researcher for a golf club manufacturer. You are given two identical looking cubes of a metal alloy. You are informed that they are made of the exact same material, but one is crystalline, whereas the other is amorphous. It is your job to determine which ones is amorphous because this one is more stress-resistant ans is useful in reinforcing golf clubs. Which of the following is the best way to determine which is which?

Solved • Jan 27, 2020