2.3 - How can matter change?

Question 1

Physical Change

Answer 1

the arrangement of a substance’s atoms or ions within molecules does not change.

Question 2

Chemical Change/Reaction

Answer 2

there is a change in the arrangement of atoms or ions
within molecules of the substances involved.

Question 3

Nuclear Fission

Answer 3

a nuclear change in which the nuclei of certain isotopes with large mass numbers (such as uranium-235) are split apart into lighter nuclei when struck by neutrons. Each fission can release two or more neutrons pls energy, leading to more fission reactions.

Question 4

Chain Reaction

Answer 4

Large amounts of energy produced from a loop of nuclear fission.

Question 5

Nuclear Fusion

Answer 5

a nuclear change in which two isotopes of light elements, such as hydrogen, are forced together at extremely high temperatures until they fuse to form a heavier nucleus

Question 6

Law of conservation of matter

Answer 6

when a physical or chemical change occurs, no atoms are created or destroyed

Question 7

Nuclear Changes

Answer 7

Changes in the nuclei of atoms

Question 8

Types of Nuclear Changes

Answer 8

Natural Radioactive Decay
Radioactive isotopes
Radioisotopes

Question 9

Natural Radioactive Decay

Answer 9

isotopes spontaneously emit fast-moving subatomic particles, high-energy radiation such as gamma rays, or both