Unit 2 ReviewUnit 2 Review

TRUE or FALSETRUE or FALSE

Salt (NaCl) is a pure substance and an Salt (NaCl) is a pure substance and an element.element.

ANSWERANSWER

False… pure substance and compound. False… pure substance and compound. Two elements combined = compoundTwo elements combined = compound

Which state of matter would take the Which state of matter would take the shape of it’s container and has a shape of it’s container and has a fixed/definite volume?fixed/definite volume?

ANSWERANSWER

LiquidLiquid

A popsicle melting on the sidewalk is an A popsicle melting on the sidewalk is an example of what type of change?example of what type of change?

ANSWERANSWER

Physical…all phase changes (solid Physical…all phase changes (solid liquid liquid gas) are physical changes. gas) are physical changes.

““A shiny piece of steel rusted from sitting A shiny piece of steel rusted from sitting out in the rain.”out in the rain.”

Which part of this statement represents a Which part of this statement represents a physical property? Which part represents physical property? Which part represents a chemical property?a chemical property?

ANSWERANSWER ““A shiny piece of steel rusted from sitting A shiny piece of steel rusted from sitting

out in the rain.”out in the rain.”

““SHINY” is physical, describing what it SHINY” is physical, describing what it looks likelooks like

““RUSTING” is chemical, because rust has RUSTING” is chemical, because rust has a different composition than steel.a different composition than steel.

Matter changing from its liquid state to its Matter changing from its liquid state to its gaseous state is called ______.gaseous state is called ______.

ANSWERANSWER

VaporizationVaporization BoilingBoiling EvaporationEvaporation

What is an ion?What is an ion?

ANSWERANSWER

An atom with a positive or negative An atom with a positive or negative charge.charge.

An atom that has lost or gained electrons.An atom that has lost or gained electrons.

If at ion has a positive charge, did it GAIN If at ion has a positive charge, did it GAIN electrons or LOSE electrons?electrons or LOSE electrons?

ANSWERANSWER

LOSE electrons so that the there are now LOSE electrons so that the there are now more positive protons than there are more positive protons than there are negative electrons.negative electrons.

What charge would group 7 most likely What charge would group 7 most likely have?have?

ANSWERANSWER

-1-1

What charge would group 2 most likely What charge would group 2 most likely have?have?

ANSWERANSWER

+2+2

How many neutrons does Carbon-14 How many neutrons does Carbon-14 have?have?

ANSWERANSWER

14 is the mass number of that particular 14 is the mass number of that particular isotope of Carbon and the atomic number isotope of Carbon and the atomic number of Carbon is 6, so of Carbon is 6, so

14-6= 8 neutrons. 14-6= 8 neutrons.

TRUE or FALSETRUE or FALSE

To get an isotope, you fluctuate the number To get an isotope, you fluctuate the number of electrons.of electrons.

ANSWERANSWER

FALSE. You would fluctuate the number of FALSE. You would fluctuate the number of neutrons to change the mass.neutrons to change the mass.

Who discovered protons and how? FIRST Who discovered protons and how? FIRST AND LAST NAME, BE DETAILED.AND LAST NAME, BE DETAILED.

ANSWERANSWER

Ernest Rutherford by shooting alpha Ernest Rutherford by shooting alpha particles (positive particles) at a piece of particles (positive particles) at a piece of foil. The alpha particles deflected, which foil. The alpha particles deflected, which showed they were hitting something else showed they were hitting something else that was positive (protons). that was positive (protons).

Who came up with the first atomic theory? Who came up with the first atomic theory? FIRST AND LAST NAME.FIRST AND LAST NAME.

ANSWERANSWER

John DaltonJohn Dalton

Who discovered electrons and how? Who discovered electrons and how? FIRST AND LAST NAME. BE DETAILED.FIRST AND LAST NAME. BE DETAILED.

ANSWERANSWER

JJ Thomson- cathode ray tube showed JJ Thomson- cathode ray tube showed electrons are emitted. Negative side of electrons are emitted. Negative side of magnet repelled (or positive side attracted) magnet repelled (or positive side attracted) so proved they were negative.so proved they were negative.

What part of the atom gives it it’s identity?What part of the atom gives it it’s identity?

ANSWERANSWER

ProtonsProtons

Would spaghetti be a pure substance or a Would spaghetti be a pure substance or a mixture?mixture?

ANSWERANSWER

Mixture (heterogeneous)Mixture (heterogeneous)

What are the 3 particles of the atom and What are the 3 particles of the atom and their respective charges?their respective charges?

ANSWERANSWER

Proton +Proton + Neutron (neutral)Neutron (neutral) Electron -Electron -

Why isn’t the mass of strontium-52 on the Why isn’t the mass of strontium-52 on the periodic table reported as 52?periodic table reported as 52?

ANSWERANSWER

The periodic table shows The periodic table shows average atomic average atomic massesmasses of all isotopes present of all isotopes present

How many electrons fit on energy level 1, How many electrons fit on energy level 1, 2,& 3?2,& 3?

ANSWERANSWER

11stst holds 2 holds 2 22ndnd holds 8 holds 8 33rdrd holds 8 holds 8

Who created the atom model where Who created the atom model where electrons are found on energy levels?electrons are found on energy levels?

ANSWERANSWER

Niels BohrNiels Bohr

Draw the Bohr diagram for phosphorus.Draw the Bohr diagram for phosphorus.

ANSWERANSWER

15 P15 P 16 N16 N 15 E15 E

Write the following info in isotopic notationWrite the following info in isotopic notation Protons- 26Protons- 26 Neutrons- 31Neutrons- 31 Electrons- 23Electrons- 23

ANSWERANSWER

5757FeFe3+3+

26

Atomic NumberAtomic Number Mass NumberMass Number NeutronsNeutrons ElectronsElectrons

ANSWERANSWER

Atomic Number- 16Atomic Number- 16 Mass Number- 33Mass Number- 33 Neutrons- 17Neutrons- 17 Electrons -18Electrons -18

Who discovered the neutron? FIRST AND Who discovered the neutron? FIRST AND LAST NAME.LAST NAME.

ANSWERANSWER

James ChadwickJames Chadwick

Protons-20Protons-20 Electrons-20Electrons-20 Neutrons-22Neutrons-22

Isotope name?Isotope name?

ANSWERANSWER

Calcium-42Calcium-42

Protons-20Protons-20 Electrons-20Electrons-20 Neutrons-22Neutrons-22

Give the correct notation.Give the correct notation.

ANSWERANSWER

What is the name of the element if the only What is the name of the element if the only information you have is there are 35 information you have is there are 35 protons?protons?

ANSWERANSWER

BromineBromine

List techniques for physically separating a List techniques for physically separating a mixture (think about our lab)mixture (think about our lab)

ANSWERANSWER

FilteringFiltering Using a magnetUsing a magnet BoilingBoiling Dissolving Dissolving