Chemistry Concepts Quiz

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Questions and Answers

Which indicator is NOT one of the observable signs of a chemical reaction?

Change in color
Change in state of matter (correct)
Change in temperature
Formation of a precipitate

Which form of electromagnetic radiation has the highest frequency?

Ultraviolet
Gamma rays (correct)
Microwaves
Radio waves

What is the primary characteristic used to define the trend of ionization energy across a period on the periodic table?

Increases due to increasing atomic radius
Decreases due to increasing nuclear charge
Increases due to increasing nuclear charge (correct)
Remains constant across periods

Which of the following items is NOT required for exam day?

<p>Textbook (A)</p> Signup and view all the answers

Which of the following options describes how electronegativity trends change down a group in the periodic table?

<p>Electronegativity decreases down a group (C)</p> Signup and view all the answers

Flashcards

What are the observable indicators of a chemical change?

A chemical change is a process that creates new substances with different chemical properties than the original substances. It can be observed by changes such as gas production, color change, precipitate formation, energy release or absorption, odor change, and change in temperature.

What is a heating curve graph?

Heating curve graphs show the relationship between temperature and heat energy added to a substance. The flat regions on the curve represent phase changes, where energy is used to break bonds rather than increasing temperature.

What are the relationships between frequency, wavelength, and energy of EM radiation?

Frequency, wavelength, and energy are fundamental properties of electromagnetic radiation. Frequency is the number of waves passing a point per second, wavelength is the distance between two crests, and energy is directly proportional to frequency.

What is the periodic table and what are the trends it represents?

The periodic table arranges elements by increasing atomic number. It contains a total of 7 periods and 18 groups or families. Trends in atomic radius, ionization energy, and electronegativity can be observed across periods and groups.

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What is atomic radius and how does it change on the periodic table?

Atomic radius is the distance from the nucleus to the outermost electron shell of an atom. It tends to decrease across a period and increase down a group.

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