Which statement is FALSE? O Pure water (H20) is always composed of 2 hydrogen atoms to 1 oxygen atom chemically bonded. O Silver (Ag) is only made up of silver atoms Gold (Au) is made up of gold, brass and tin atoms O Soft drinks, such as cola or cherry soda, are mixtures of such substances as carbon dioxide, sugars and water and flavors and maybe caffeine O Elements and compounds are both examples of pure substances.

Which statement is FALSE? O Pure water (H20) is always composed of 2 hydrogen atoms to 1 oxygen atom chemically bonded. O Silver (Ag) is only made up of silver atoms Gold (Au) is made up of gold, brass and tin atoms O Soft drinks, such as cola or cherry soda, are mixtures of such substances as carbon dioxide, sugars and water and flavors and maybe caffeine O Elements and compounds are both examples of pure substances.

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 7ALQ: You may have noticed that when water boils, you can see bubbles that rise to the surface of the...

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Copper: (a) Suppose you have a cube of copper metal that is 0.236 cm on a side with a mass of 0.1206 g. If you know that each copper atom (radius = 128 pm) has a mass of 1.055 1022 g (you will learn in Chapter 2 how to find the mass of one atom), how many atoms are there in this cube? What fraction of the cube is filled with atoms? (Or conversely, how much of the lattice is empty space?) Why is there empty space in the lattice? (b) Now look at the smallest, repeating unit of the crystal lattice of copper. Knowing that an edge of this cube is 361.47 pm and the density of copper is 8.960 g/cm3, calculate the number of copper atoms in this smallest, repeating unit.
If we classify substances as ionic, molecular, macromolecular, or metallic, in which if any categories are all the members a. soluble in water? b. electrical conductors in the melt? c. insoluble in all common solvents? d. solids at room temperature?
1f a piece of hard, white blackboard chalk is heated strongly in a flame, the mass of the piece of chalk will decrease, and eventually the chalk will crumble into a white dust. Does this change suggest that the chalk is composed of an element or a compound?
Which part of the description of a compound or element refers to its physical properties and which to its chemical properties? (a) The colorless liquid ethanol bums in air. (b) The shiny metal aluminum reacts readily with orange-red bromine
a Which of the following substances would you expect to be elements and which would you expect to be compounds? 1 aluminum sulfate; 2 osmium; 3 radon; 4 lithium carbonate; 5 dimethylhydrazine. b On what general rule do you base your answers to part a? Can you name any exceptions to this general rule for compounds?
Sketch a magnified view (showing atoms and/or molecules) of each of the following, and explain why the specified type of mixture is a heterogeneous mixture of two different compounds. a homogeneous mixture of an element and a compound.
¡n a sample of a gaseous substance, more than 99% of the overall volume of the sample is empty space. How is this fact reflected in the properties of a gaseous substance compared with the properties of a liquid or solid substance?
A mixture contains the following five pure substances: Cl2, C2Cl6, H2CO3, H2SO4, and HC1. a. How many different kinds of diatomic molecules arepresent in the mixture? b. How many different kinds of atoms are present in themixture? c. How many total atoms are in a mixture samplecontaining four molecules of each component? d. How many total carbon atoms are present in a mixturesample containing three molecules of each component?
If the combination of iron filings and sulfur in Question 25 is heated strongly, the iron reacts with the sulfur to form a solid that is no longer attracted by the magnet. Would this still represent a “mixture”? Why or why not?
You may have noticed that when water boils, you can see bubbles that rise to the surface of the water. Which of the following is inside these bubbles? Explain. a. air b. hydrogen and oxygen gas c. oxygen gas d. water vapor e. carbon dioxide gas