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Questions and Answers
Which of the following are examples of a chemical change? (Select all that apply)
Which of the following are examples of a chemical change? (Select all that apply)
If an object has a density of 8.65 g/cm^3, what is its density in units of kg/m^3?
If an object has a density of 8.65 g/cm^3, what is its density in units of kg/m^3?
8.65 x 10^3 kg/m^3
Which of the following are examples of physical change? (Select all that apply)
Which of the following are examples of physical change? (Select all that apply)
Which of the following statements about energy is false?
Which of the following statements about energy is false?
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How many significant figures are in 3.408 x 10^4?
How many significant figures are in 3.408 x 10^4?
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What answer should be reported, with the correct number of significant figures, for the calculation (25.26 + 4.8)/0.700?
What answer should be reported, with the correct number of significant figures, for the calculation (25.26 + 4.8)/0.700?
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Which of the following statements about the phases of matter is true?
Which of the following statements about the phases of matter is true?
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Which of the following are examples of intensive properties? (Select all that apply)
Which of the following are examples of intensive properties? (Select all that apply)
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Which of the following are examples of physical change? (Select all that apply)
Which of the following are examples of physical change? (Select all that apply)
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Choose the pure substance from the list below:
Choose the pure substance from the list below:
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Which of the following are examples of a chemical change? (Select all that apply)
Which of the following are examples of a chemical change? (Select all that apply)
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How many significant figures are in 1009.630 mL?
How many significant figures are in 1009.630 mL?
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A student performs an experiment to determine the density of a sugar solution. If the actual value for the density of the sugar solution is 2.73 g/mL, which statement best describes her results?
A student performs an experiment to determine the density of a sugar solution. If the actual value for the density of the sugar solution is 2.73 g/mL, which statement best describes her results?
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A pure substance composed of 2 or more kinds of element atoms in a fixed, definite proportion is considered?
A pure substance composed of 2 or more kinds of element atoms in a fixed, definite proportion is considered?
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An element can be described as?
An element can be described as?
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Which of the following represents a physical property?
Which of the following represents a physical property?
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Which of the following represents a chemical property of hydrogen gas?
Which of the following represents a chemical property of hydrogen gas?
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Study Notes
Chemical Changes
- Leaves turning color in the fall is an example of a chemical change.
- Chemical changes involve alterations in the fundamental composition of a substance.
Density Conversions
- A density of 8.65 g/cm³ translates to 8.65 x 10³ kg/m³.
Physical Changes
- Brewing coffee, melting ice, and subliming dry ice are all examples of physical changes.
- Physical changes do not alter the composition but may change the state of matter.
Energy Properties
- Potential energy is incorrectly defined as motion-related; it actually refers to stored energy due to position.
- The total energy of a system remains constant, and energy can transform between types.
Significant Figures
- The number 3.408 x 10⁴ contains 4 significant figures.
- Correct significant figures must be adhered to in calculations, e.g., (25.26 + 4.8)/0.700 results in 43.0.
Phases of Matter
- In solids and liquids, atoms pack more closely compared to gases, which influences compressibility.
Intensive vs. Extensive Properties
- Density is an intensive property, meaning it does not depend on the amount of substance.
- Mass and volume are extensive properties that change with the quantity of material.
Identification of Physical Changes
- Dew forming on grass is a physical change, while cooking an egg is not.
Pure Substances
- Carbon monoxide is classified as a pure substance as it contains one kind of molecule.
More on Chemical Changes
- Building materials developing a green patina and burning matches are both chemical changes.
Precision and Accuracy in Measurements
- A set of measurements can be precise but inaccurate, as in the case of the density of a sugar solution.
Compounds and Elements
- A compound consists of two or more types of atoms in fixed ratios.
- An element is defined as a pure substance made up of identical atoms.
Physical Properties
- Mercury being a liquid at room temperature exemplifies a physical property.
- Sodium's reactivity and the flammability of butane are considered chemical properties.
Chemical Properties
- Hydrogen gas's explosive reaction with oxygen demonstrates its chemical property.
Studying That Suits You
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Description
Test your knowledge with this Chemistry MC Quiz covering fundamental concepts from chapters 1-6 through 1-8. Each question is designed to assess your understanding of chemical changes, density, and more. Perfect for students looking to reinforce their chemistry skills.
