ACT Science 2

Front

What is the pH range where bromocresol green changes color?

Back

Bromocresol green changes color from yellow to blue between pH 4.0 and pH 5.6.

Front

What does a blue color indicate when using bromothymol blue as an indicator?

Back

A blue color indicates a basic solution, typically with a pH above 7.6.

Front

What is the significance of phenolphthalein turning colorless?

Back

Phenolphthalein is colorless in acidic solutions (pH < 8.2) and turns pink in basic solutions (pH > 8.2).

Front

Define the term 'orbital period' in the context of binary star systems.

Back

The orbital period is the time it takes for one star to complete a full orbit around another star in a binary system.

Front

What is the relationship between the magnitudes of stars in a binary system and their orbital characteristics?

Back

A greater difference in magnitudes between two stars can lead to a deeper primary minimum in their light curve.

Front

What is the typical pH of a neutral solution?

Back

The typical pH of a neutral solution is 7.

Front

What color does phenolphthalein turn in a basic solution?

Back

Phenolphthalein turns pink in a basic solution.

Front

What is the color change of bromothymol blue at pH 7?

Back

At pH 7, bromothymol blue is green.

Front

How does the pH scale range from acidic to basic?

Back

The pH scale ranges from 0 (acidic) to 14 (basic), with 7 being neutral.

Front

What is the significance of a star's orbital period in a binary system?

Back

The orbital period can provide insights into the masses and distances of the stars in the system.