Question

fill in the blank
complete each statement using a term or terms from the list below. write your answers in the spaces provided.
burning helium hydrogen chemical four nuclear one nuclei oxygen energy fusion light

1. burning is a ____________ reaction in which ____________ links up with another substance.
2. the energy that powers stars is not caused by ______________.
3. stars get their energy from ______________ reactions.
4. the kind of nuclear reaction that gives stars their energy is called ______________.
5. fusion joins the ______________ of atoms.
6. the sun is made up mostly of ______________.
7. fusion on the sun joins atoms of hydrogen. ____________ hydrogen atoms fuse to form ____________ atom of helium.
8. ______________ is nearly four times heavier than hydrogen.
9. about 1% of the mass of the hydrogen atoms does not become helium atoms. it changes to ______________.
10. anything that becomes hot enough gives off ______________.

matching
match each term in column a with its description in column b. write the correct letter in the space provided.
column a

1. fuse
2. fusion reactions
3. hydrogen
4. sun
5. helium

column b
a) give the sun its energy
b) nearly four times heavier than hydrogen
c) about 90% of the sun
d) join
e) a star

Explanation:

1. Burning is a chemical reaction where oxygen combines with another substance. Stars' energy comes from nuclear fusion, not chemical reactions. Fusion joins atomic nuclei. The sun is mainly hydrogen, and four hydrogen atoms fuse to form one helium atom. Helium is heavier than hydrogen. Mass - energy conversion occurs in fusion, and hot objects emit light. For the matching part, we match based on the described properties and relationships.

Answer:

1. chemical; oxygen
2. chemical
3. nuclear
4. fusion
5. nuclei
6. hydrogen
7. four; one
8. Helium
9. energy
10. light

Matching:

1. d
2. a
3. c
4. e
5. b