Podcast
Questions and Answers
Which statement best describes a chemical change?
Which statement best describes a chemical change?
- The appearance of matter changes without changing its composition.
- The kind of matter changes, producing new substances. (correct)
- Only physical properties are altered.
- No new substances are formed.
A wave's frequency is inversely related to its energy.
A wave's frequency is inversely related to its energy.
False (B)
What is the speed of light in meters per second?
What is the speed of light in meters per second?
3 x 10^8
To convert Celsius to Kelvin, you add _____ to the Celsius temperature.
To convert Celsius to Kelvin, you add _____ to the Celsius temperature.
Match the following scientists with their contributions to atomic theory:
Match the following scientists with their contributions to atomic theory:
Flashcards
Physical Change
Physical Change
A change in the appearance or form of matter, but not the type of matter.
Chemical Change
Chemical Change
A change where the type of matter changes, forming a new substance with new properties.
Wavelength
Wavelength
Distance between identical points on a wave, like crest to crest or trough to trough.
Wave Frequency
Wave Frequency
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Atomic Theory: Democritus
Atomic Theory: Democritus
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Study Notes
Physical vs. Chemical Changes
- Physical changes alter the appearance or form of matter without changing the underlying substance.
- Chemical changes result in new substances with distinct properties.
Waves
- Wavelength is the separation between equivalent points on a wave.
- Frequency measures the number of wave crests or troughs passing a point in a given time.
- Higher frequency equates to greater energy.
- Doubling frequency results in doubling energy.
- Speed of light is approximately 3 x 10⁸ m/s.
- 1 nanometer (nm) = 10⁻⁹ meters.
Temperature Conversions
- Celsius to Kelvin: Add 273.15 to the Celsius temperature.
Atomic Theory
Democritus (400 BCE)
- Proposed that matter consists of indivisible atoms.
John Dalton (1803)
- Developed atomic theory, stating that atoms are indivisible and combine in fixed ratios.
J.J. Thomson (1897)
- Discovered electrons; proposed a "plum pudding" model with electrons embedded within a positively charged sphere.
Ernest Rutherford (1911)
- Discovered the atomic nucleus; established that atoms are mostly empty space with a dense central nucleus.
Niels Bohr (1913)
- Proposed that electrons orbit the nucleus in fixed energy levels.
Erwin Schrödinger (1926)
- Developed the quantum model; electrons are described as probability clouds rather than fixed orbits.
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Description
This quiz covers key concepts related to physical and chemical changes, the properties of waves, temperature conversions, and atomic theory. Test your knowledge on the fundamental differences between physical and chemical alterations, delve into wave properties, and explore the historical development of atomic theory.
