ACT Science 2
Flashcard
•
Science
•
11th - 12th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the pH level at which phenolphthalein undergoes a color change?
Back
Phenolphthalein undergoes a color change at a higher pH level because it reacts in more basic solutions.
2.
FLASHCARD QUESTION
Front
In a light curve, what does a deeper primary minimum indicate about the stars in a system?
Back
A deeper primary minimum indicates a more extreme difference between the magnitudes of the two stars.
3.
FLASHCARD QUESTION
Front
What happens to the light curves of a system when viewed from a line of sight that is perpendicular to the orbital plane?
Back
The light curves would indicate no difference in magnitude over time.
4.
FLASHCARD QUESTION
Front
What color change indicates the completion of a reaction in a basic solution when using bromocresol green?
Back
The addition of bromocresol green results in a blue color.
5.
FLASHCARD QUESTION
Front
How does the orbital period of a star system relate to the depth of its primary minimum?
Back
A shorter orbital period can lead to a shallower primary minimum if the stars have similar magnitudes.
6.
FLASHCARD QUESTION
Front
What is the role of indicators like bromothymol blue in acid-base reactions?
Back
Indicators change color at specific pH levels, signaling the acidity or basicity of a solution.
7.
FLASHCARD QUESTION
Front
What does a light curve represent in astrophysics?
Back
A light curve represents the brightness of a star system over time, often indicating eclipses or transits.
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