General Chemistry Video Tutorial & Practice

1. Intro to General Chemistry

Classification of Matter

16 videos48 questions

VIDEOS 16

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PRACTICE 48

Multiple Choice
Which of the following statements is true?
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Multiple Choice
Choose the homogeneous mixture from the list below.
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Open Question
Classify each of the following as an element, compound or mixture.
a) Ammonia, NH3
b) Gold bar
c) Orange juice
d) Wine
e) Saline solution
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Multiple Choice
Consider the following data obtained by decomposing samples of carbon dioxide, CO₂, into its component elements.

Mass of CO₂ and Components

Sample Mass CO₂ Mass C Mass O₂

1 44.00 g 12.00 g 32.00 g

2 22.00 g 6.00 g 16.00 g

3 88.00 g 24.00 g 64.00 g

Which of the following statements is consistent with this data?
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Multiple Choice
Atoms __________ .
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Multiple Choice
Which of the following is an example of a pure substance?
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Textbook Question
Which of the following statements is a hypothesis about the synthesis of gold nanoparticles? (LO 1.1) (a) Adding a salt solution to gold nanoparticles causes the color to change from red to blue. (b) To examine the effect of salt on gold nanoparticles, variable concentrations of salt are added to the nanopar-ticles and the results are measured (c) A solution of gold nanoparticles with an average diam-eter of 30 nm has a wavelength of maximum absorption of 450 nm and is a reddish-orange color. (d) Adding a substance with a negative charge to the surface of the nanoparticles creates repulsive forces that stabilize small particle size
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Textbook Question
Which of the following figures represents (d) a mixture of an element and a compound? (More than one picture might fit each description.)
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Textbook Question
Which of the following figures represents (a) a pure element, (More than one picture might fit each description.)
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Textbook Question
Which of the following figures represents (c) a pure compound, (More than one picture might fit each description.)
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Textbook Question
Which of the following figures represents (b) a mixture of two elements, (More than one picture might fit each description.)
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Textbook Question
Musical instruments like trumpets and trombones are made from an alloy called brass. Brass is composed of copper and zinc atoms and appears homogeneous under an optical microscope. The approximate composition of most brass objects is a 2:1 ratio of copper to zinc atoms, but the exact ratio varies somewhat from one piece of brass to another. (a) Would you classify brass as an element, a compound, a homogeneous mixture, or a heterogeneous mixture?
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Textbook Question
Is the separation method used in brewing a cup of coffee best described as distillation, filtration, or chromatography?
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Textbook Question
The molecular illustration represents (LO 2.18) (a) a pure element (b) a mixture of two elements (c) a pure compound (d) a mixture of an element and a compound
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Textbook Question
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (d) iodine tincture.
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Textbook Question
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (c) aluminium
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Textbook Question
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (d) mayonnaise.
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Textbook Question
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (c) diamond
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Textbook Question
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (b) beer
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Textbook Question
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (a) milk
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Textbook Question
A solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B and a gas C. The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen. Based on these observations, can we determine whether solids A and B and gas C are elements or compounds?
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Textbook Question
Millikan determined the charge on the electron by studying the static charges on oil drops falling in an electric field (Figure 2.5). A student carried out this experiment using several oil drops for her measurements and calculated the charges on the drops. She obtained the following data: Droplet Calculated Charge (C) A 1.60 * 10-19 B 3.15 * 10-19 C 4.81 * 10-19 D 6.31 * 10-19 (c) What value should she report for the electronic charge?
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Textbook Question
The following statements pertain to the development of the theory of combustion by the French chemist Lavoisier in the eighteenth century. Match the statement with the appro-priate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method (c) Combustion of a metal in a closed container ceases after a length of time.
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Textbook Question
The following statements pertain to the development of the theory of combustion by the French chemist Lavoisier in the eighteenth century. Match the statement with the appro-priate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method (b) Oxygen gas combines with a substance during its combustion.
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Textbook Question
The following statements pertain to the development of the theory of combustion by the French chemist Lavoisier in the eighteenth century. Match the statement with the appro-priate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method (a) A metal is burned in a closed container, and the change in mass of the solid and volume of the gas is measured.
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Textbook Question
The following statements pertain to the development of the theory of the structure of DNA. Match the statement with the appropriate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method. (b) In a sample of DNA, there are equal amounts of the bases A and T and equal amounts of the bases C and G.
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Textbook Question
The following statements pertain to the development of the theory of the structure of DNA. Match the statement with the appropriate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method. (a) Two strands of DNA wind around one another in a helical structure.
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Textbook Question
The following statements pertain to the development of the theory of the structure of DNA. Match the statement with the appropriate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method. (c) Direct X rays at a sample of crystallized DNA, and inter-pret the diffraction pattern for structural information.
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Textbook Question
Classify each statement as an observation, a law, or a theory. a. All matter is made of tiny, indestructible particles called atoms. b. When iron rusts in a closed container, the mass of the container and its contents does not change. c. In chemical reactions, matter is neither created nor destroyed. d. When a match burns, heat is released
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Textbook Question
Classify each statement as an observation, a law, or a theory. a. Chlorine is a highly reactive gas. b. If elements are listed in order of increasing mass of their atoms, their chemical reactivities follow a repeating pattern. c. Neon is an inert (or nonreactive) gas. d. The reactivity of elements depends on the arrangement of their electrons.
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Textbook Question
Refer to Figure 1.2. What is developed when numerous observations support a hypothes
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Textbook Question
What is the difference between a hypothesis and theory? (a) A hypothesis provides an explanation for a phenomenon, but a theory does not. (b) A theory provides an explanation for a phenomenon, but a hypothesis does not. (c) Both a theory and a hypothesis provide an explanation for a phenomenon, but a theory has been upheld by experi-mental observations
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Textbook Question
Classify each substance as a pure substance or a mixture. If it is a pure substance, classify it as an element or a compound. If it is a mixture, classify it as homogeneous or heterogeneous. a. sweat b. carbon dioxide c. aluminum d. vegetable soup
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Textbook Question
Classify each substance as a pure substance or a mixture. If it is a pure substance, classify it as an element or a compound. If it is a mixture, classify it as homogeneous or heterogeneous. a. wine b. beef stew c. iron d. carbon monoxide
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Textbook Question
Determine whether each molecular diagram represents a pure substance or a mixture. If it represents a pure substance, classify the substance as an element or a compound. If it represents a mixture, classify the mixture as homogeneous or heterogeneous.
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Textbook Question
In the following drawings, red and blue spheres represent atoms of different elements. Match the molecular pictures (a)–(c) with the following descriptions: (i) a pure substance consisting of a compound (ii) a pure substance consisting of an element (iii) a mixture of element
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Textbook Question
Determine whether each molecular diagram represents a pure substance or a mixture. If it represents a pure substance, classify the substance as an element or a compound. If it represents a mixture, classify the mixture as homogeneous or heterogeneous.
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Textbook Question
Classify each of the following as a pure substance, a solution, or a heterogeneous mixture: (b) a 999 gold bar
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Textbook Question
Classify each of the following as a pure substance, a solution, or a heterogeneous mixture: (c) stainless steel.
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Textbook Question
(b) A(n) _________ reliably predicts the behavior of matter, while a(n) _________ provides an explanation for that behavior.
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Textbook Question
(a) Which is more likely to eventually be shown to be incorrect: an hypothesis or a theory?
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Textbook Question
Which of the following would you characterize as pure or nearly pure substance? (a) stomach acid; (b) dry ice; (c) ice-cream; (d) stainless steel; (e) petroleum; (f) distilled water; (g) carbon monoxide gas; (h) compressed air in balloon.
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Textbook Question
The water supply for a midwestern city contains the following impurities: coarse sand, finely divided particulates, nitrate ions, trihalomethanes, dissolved phosphorus in the form of phosphates, potentially harmful bacterial strains, dissolved organic substances. Which of the following processes or agents, if any, is effective in removing each of these impurities: coarse sand filtration, activated carbon filtration, aeration, ozonization, precipitation with aluminum hydroxide?
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Textbook Question
Judge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (i) Compounds always contain at least two different elements.
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Textbook Question
Judge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (b) All mixtures contain at least one element and one compound.
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Textbook Question
Judge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (a) Air and water are both elements.
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Textbook Question
Judge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (c) Compounds can be decomposed into two or more other substances; elements cannot.
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Textbook Question
Judge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (f) A hypothesis is more weakly supported by experimental evidence than a theory.
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Mass of CO₂ and Components
Sample	Mass CO₂	Mass C	Mass O₂
1	44.00 g	12.00 g	32.00 g
2	22.00 g	6.00 g	16.00 g
3	88.00 g	24.00 g	64.00 g

Physical & Chemical Changes

14 videos17 questions

VIDEOS 14

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PRACTICE 17

Chemical Properties

9 videos1 question

VIDEOS 9

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PRACTICE 1

Multiple Choice
Which of the following represents a chemical property of hydrogen gas?
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Physical Properties

9 videos7 questions

VIDEOS 9

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PRACTICE 7

Intensive vs. Extensive Properties

9 videos9 questions

VIDEOS 9

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PRACTICE 9

Temperature

12 videos32 questions

VIDEOS 12

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PRACTICE 32

Scientific Notation

11 videos12 questions

VIDEOS 11

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PRACTICE 12

SI Units

10 videos18 questions

VIDEOS 10

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PRACTICE 18

Metric Prefixes

10 videos48 questions

VIDEOS 10

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PRACTICE 48

Significant Figures

9 videos49 questions

VIDEOS 9

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PRACTICE 49

Trial 1	2.125 g
Trial 2	2.123 g
Trial 3	2.127 g

Significant Figures: In Calculations

10 videos25 questions

VIDEOS 10

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PRACTICE 25

Conversion Factors

9 videos7 questions

VIDEOS 9

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PRACTICE 7

Dimensional Analysis

8 videos119 questions

VIDEOS 8

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