8th grade final exam

Front

What is the difference between coefficients and subscripts in chemical reactions?

Back

Subscripts show the number of atoms, coefficients show the number of units of a substance.

Front

What layer of the Sun’s atmosphere extends into space for millions of kilometers and looks like a white halo?

Back

Corona

Front

What are the two main elements that make up the Sun?

Back

Hydrogen and Helium

Front

What is the Big Bang?

Back

The initial explosion that resulted in the formation and expansion of the universe.

Front

Why does the chromosphere appear reddish and when is it most easily observed?

Back

It glows red due to its temperature and is seen during the beginning and end of a total solar eclipse.

Front

What is a coefficient in a chemical equation?

Back

A number placed before a chemical formula to indicate how many molecules or atoms of that substance are involved in the reaction.

Front

What is a subscript in a chemical formula?

Back

A small number written after an element symbol to indicate the number of atoms of that element in a molecule.

Front

What is the photosphere?

Back

The visible surface of the Sun that emits light and is the layer we see from Earth.

Front

What is the chromosphere?

Back

A layer of the Sun's atmosphere above the photosphere, visible during solar eclipses, and appears reddish.

Front

What is nuclear fusion?

Back

The process by which two light atomic nuclei combine to form a heavier nucleus, releasing energy, and is how stars produce energy.