Front

What is a Hertzsprung-Russell (H-R) diagram?

Back

A graphical representation of stars plotted according to their luminosity and temperature, used to classify stars and understand their evolution.

Front

What type of star has a high luminosity and high temperature?

Back

Blue giant.

Front

What is the chemical reaction that occurs when baking soda is mixed with hydrochloric acid?

Back

The reaction produces carbon dioxide gas, which is observed as bubbles.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the best evidence of a chemical reaction?

Back

The formation of bubbles when baking soda and hydrochloric acid combine.

Tags

NGSS.MS-PS1-2

Front

What position of Earth represents summer in the United States?

Back

Position 2, when the Northern Hemisphere is tilted towards the sun.

Tags

NGSS.MS-ESS1-1

Front

What are the energy transformations in a hand generator?

Back

Mechanical energy is transformed into electrical energy, which is then transformed into light energy.

Front

What is Newton's third law of motion?

Back

For every action, there is an equal and opposite reaction.

Tags

NGSS.MS-PS2-1

Front

What is an example of an action-reaction pair involving a bird and a fence post?

Back

Action: The force of the bird on the fence post. Reaction: The force of the fence post on the bird.

Tags

NGSS.MS-PS2-1

Front

What is luminosity in the context of stars?

Back

Luminosity is the total amount of energy emitted by a star per unit of time, often measured in watts.

Tags

NGSS.HS-ESS1-1

Front

What is the significance of temperature in the H-R diagram?

Back

Temperature helps classify stars and indicates their stage in the stellar lifecycle.