1.2 Phases and Classification of Matter

Solids, liquids, and gases; mass against weight; conservation of matter; and sorting samples into elements, compounds, and homogeneous or heterogeneous mixtures.

Chemistry 2e, 1.2 Phases and Classification of Matter

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9 exercises

1.2 Exercise 2

What properties distinguish solids from liquids? Liquids from gases? Solids from gases?

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1.2 Exercise 4

How does a homogeneous mixture differ from a pure substance? How are they similar?

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1.2 Exercise 6

How do molecules of elements and molecules of compounds differ? In what ways are they similar?

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1.2 Exercise 8

Many of the items you purchase are mixtures of pure compounds. Select three of these commercial products and prepare a list of the ingredients that are pure compounds.

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1.2 Exercise 10

Classify each of the following as an element, a compound, or a mixture:

(a) iron

(b) oxygen

(d) pancake syrup

(e) carbon dioxide

(f) a substance composed of molecules each of which contains one hydrogen atom and one chlorine atom

(g) baking soda

(h) baking powder

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1.2 Exercise 12

How are the molecules in oxygen gas, the molecules in hydrogen gas, and water molecules similar? How do they differ?

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1.2 Exercise 14

Prepare a list of the principal chemicals consumed and produced during the operation of an automobile.

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1.2 Exercise 16

When elemental iron corrodes it combines with oxygen in the air to ultimately form red brown iron(III) oxide called rust. (a) If a shiny iron nail with an initial mass of 23.2 g is weighed after being coated in a layer of rust, would you expect the mass to have increased, decreased, or remained the same? Explain. (b) If the mass of the iron nail increases to 24.1 g, what mass of oxygen combined wi…

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1.2 Exercise 18

Yeast converts glucose to ethanol and carbon dioxide during anaerobic fermentation as depicted in the simple chemical equation here:

\text{glucose} \rightarrow \text{ethanol} + \text{carbon dioxide}

(a) If 200.0 g of glucose is fully converted, what will be the total mass of ethanol and carbon dioxide produced?

(b) If the fermentation is carried out in an open container, would you expect the mass of the container and contents after fermentation to be less than…

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