(8) Fall Semester Exam

Front

What is the primary factor that determines the life cycle of a star? Options: the mass of the star, the presence of planets around the star, the location of the star in the galaxy, the amount of helium in the star

Back

the mass of the star

Front

A star is "born" when nuclear ____ begins.

Back

Fusion

Front

Stars spend most of their life in the ___ phase.

Back

main sequence

Front

Inside a nebula are regions where gravity pulls together gas and dust into a ___.

Back

protostar

Front

Which color star is the coolest? Options: red, blue, purple, yellow

Back

red

Front

What is meant by a star's magnitude?

Back

the brightness or luminosity of a star

Front

How does the chemical formula of O₂ indicate that it is an element?

Back

It only has one type of atom.

Front

Which of the following is an example of a homogeneous mixture? Salt dissolved in water, Sand and water, Iron filings and sulfur powder, chocolate chip cookie

Back

Salt dissolved in water

Front

Which statement best supports the argument that fruit salad is a model for a heterogeneous mixture? Options: The different fruits can be easily seen and separated., The fruit salad has a uniform composition throughout., The fruits in the salad are chemically bonded together., The fruit salad contains only one type of fruit.

Back

The different fruits can be easily seen and separated.

Front

How would you model a compound that has 2 atoms of carbon (C) and 6 atoms of hydrogen (H)?

Back

C₂H₆