The Nature of Matter-2

Question 1

What are Atoms?

Answer 1

The basic unit of matter
Very small
Contain subatomic particles that are even smaller

Question 2

What are Subatomic Particles? The 3 things they contain

Answer 2

Proton
Neutron
Electron

Question 3

What are Protons and Neutrons?

Answer 3

PROTONS
Have nearly the same charge
Protons are positively charged particles
NEUTRONS
Have no charge
Pro and Neu are bound together by strong forces to create the nucleus of the atom

Question 4

What are Electrons?

Answer 4

Negatively charged particle
Only 1/1840 the mass of a Proton
Electrons are in constant motion
Attracted to positive protons but the energy of their motion keeps them outside the nucleus

Question 5

What is the Charge of an Atom?

Answer 5

Have equal number protons (positively charged) as electrons (negatively charged) and therefore are electrically neutral

Question 6

What are Elements?

Answer 6

A pure substance that consists entirely of on type of atom

Represented by one or two letter symbols

Question 7

What is an Atomic Number?

Answer 7

The number of protons in the nucleus of an element

Question 8

What are Isotopes?

Answer 8

Atoms of the same element that differ in the number of neutrons are known as isotopes

Question 9

What are Radioactive Isotopes?

Answer 9

An isotope that has a unstable nuclei and will break down at a constant rate over time

Question 10

What is the Purpose of Radioactive Isotopes?

Answer 10

Determine the age of the rocks
Detect and Treat Cancer
Kill Bacteria that causes food borne illnesses
Can be used as tracers to follow the movement of substances with organisms

Question 11

What are Chemical Compounds?

Answer 11

A substance formed by the chemical combination of two or more elements in definite proportions
A chemical formula is used to show the composition of a compound