Chapter 3 Test Review

Front 1

1. What did Rutherford´s gold foil experiment show?

Back 1

It proved the existance of a small massive center to atoms, which would later be noticed as a nucleus of an atom.

Front 2

2. Know the different models of atoms and the scientists who came up with it.

Front 3

3. What is the atomic mass number?

Back 3

It is the number of protons plus the number of neutrons it contains.

Front 4

4. What is the atomic number?

Back 4

It tells you the number of protons in the nucleus of each atom in that element.

Front 5

5. How do you find the number of neutrons in an atom?

Back 5

To determine the number of neutrons in an atom, you subtract the number of protons from the mass number.

Front 6

6. What charge does each particle of an atom have?

Back 6

Protons,neutrons, and electrons are the three main subatomic particles found in an atom. A proton has a positive charge, and neutrons have no electrical charge.

Front 7

7. What´s an isotope?

Back 7

Atoms of the same element that have different numbers of neutrons.

Front 8

8. What are the different classifications of elements?

Back 8

On the periodic table, the elements are classified by whether they are a metal, nonmetal, or a metalloid.

Front 9

9. What is a substance?

Back 9

Matter that has the same composition and properties throughout.

Front 10

10. What is a mixture?

Back 10

When two or more substances come together but don´t combine to make a new substance.

Front 11

11. What is the difference between a mixture and a compound?

Back 11

Each substance in a mixture keeps its own properties. The compound has properties different from the element it contains. Each substance is easily separated from the mixture.

Front 12

12. Compare and contrast a heterogeneous and homogeneous mixture.

Back 12

A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly different substances or phases. The three phases or states of matter are gas, liquid, and solid.

Front 13

13. What information does a chemical formula give you?

Back 13

A chemical formula can tell you the amount of each individual element that makes up that compound.

Front 14

Matter

Back 14

anything that has mass and takes up space.

Front 15

atom

Back 15

a small particle that makes up most types of matter.

Front 16

law conservation of matter

Back 16

this states that matter is not created or destroyed--it only changes form.

Front 17

electrons

Back 17

invisible,negatively charged particles.

Front 18

nucleus

Back 18

the positively charged, central part of the atom.

Front 19

proton

Back 19

positively charged particles in the nucleus.

Front 20

neutron

Back 20

uncharged particles.

Front 21

element

Back 21

matter made up of only one kind of atom.

Front 22

atomic number

Back 22

tells you the number of protons in the nucleus of each atom in that element.

Front 23

isotopes

Back 23

atoms of the same element that have different numbers of neutrons.

Front 24

mass number

Back 24

tells the number of protons plus the number of neutrons it contains.

Front 25

atomic mass

Back 25

weighted average mass of isotopes in an element.

Front 26

metals

Back 26

have a shiny or metallic luster and are good conductors of heat and electricity.

Front 27

nonmetals

Back 27

elements that are usually dull in appearance, and most are poor conductors of heat and electricity.

Front 28

metalloid

Back 28

elements that have characteristics of metals and nonmetals, and some are shiny and are conductors, but they are not as good of conductors as metals.

Front 29

substance

Back 29

matter that has the same composition and properties throughout.

Front 30

compound

Back 30

a substance whose smallest unit is made up of atoms of more than one element bonded together.

Front 31

mixture

Back 31

when two or more substances come together but do not combine to make a new substance.