Midterm Exam Practice
Flashcard
•
Chemistry
•
11th Grade
•
Practice Problem
•
Easy
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15 questions
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1.
FLASHCARD QUESTION
Front
What are the two phases of a compound represented in particle diagrams?
Back
The two phases of a compound can be represented by different particle diagrams, such as solid and gas phases.
2.
FLASHCARD QUESTION
Front
What is the balanced chemical equation for the reaction of magnesium and nitrogen?
Back
3Mg(s) + N₂(g) → Mg₃N₂(s)
3.
FLASHCARD QUESTION
Front
How do alkali metals compare to halogens in terms of electrical conductivity at STP?
Back
Alkali metals have higher electrical conductivity than halogens at STP.
4.
FLASHCARD QUESTION
Front
What is the relationship between volume, pressure, and temperature for gases?
Back
According to the ideal gas law, PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature.
5.
FLASHCARD QUESTION
Front
What is the significance of STP in gas calculations?
Back
STP (Standard Temperature and Pressure) is defined as 0°C (273.15 K) and 1 atm pressure, providing a reference point for gas behavior.
6.
FLASHCARD QUESTION
Front
How can you determine the number of atoms in a gas sample?
Back
The number of atoms in a gas sample can be determined using the ideal gas law and Avogadro's number.
7.
FLASHCARD QUESTION
Front
What are endangered elements, and why are they important?
Back
Endangered elements are those that are rare or at risk of depletion; they are important for various industrial and technological applications.
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