Units 1-4

Question 1

What is 0.0000000000235 in scientific notation?

Answer 1

2.35 x 10^-11

Question 2

What is smaller number? A. 1.1 x 10^-7 B.5.76 x 10^-7

Answer 2

A. 1.1 x 10^-7

Question 3

Convert 312 pm to nm…

Answer 3

0.312 nm

Question 4

Convert 4.77nm to A(angstrom)

Answer 4

47.7 A

Question 5

How does the movement of atoms differ between their solid and liquid states?

Answer 5

Solids atoms are in in a fixed postion. Liquid will allow movement from fixed state.

Question 6

What is the Achilles heel of glass and is this a chemical or physical property?

Answer 6

The achilles heel is the BRITLENESS of glass which is a physical property.

Question 7

What is the LEAST dense state of matter

Answer 7

Gas

Question 8

What is the difference between amorphous or crystalline substance?

Answer 8

Crystalline will have an ordered array of molecules that repeats; amorphous is random, disordered arrangement of atoms

Question 9

Is blood : a. substnace b. solution c.heterogenuos mixture d. homogeneous mixture e. element

Answer 9

Homeogenous to naked eye OR heterogeneous under microscope

Question 10

When the element potassium combines with a nonmetal it loses one electron to form a
potassium ion. Determine the number of protons and electrons in a potassium ion, and the charge of the potassium ion:

Answer 10

K+ –> 19 protons and 18 electrons

Question 11

List the following for an oxide ion: formula, proton #, Electron #, charge

Answer 11

O(^-2) , protons: 8, electrons: 10, charge: -2

Question 12

What is an ionic compound? What is cation v anion?

Answer 12

When metals combine with nonmetals (mainly solids w/ high melting point)
Cation: Metal atoms will give up 1-3 electrons to form a positively charged ion ( lost electrons so becomes positive!)
Anion: the nonmetal will gain 1-3 electrons to form negatively charged ion ( gains electrons so becomes more negative!)

Question 13

What is a substance? What is a mixture?

Answer 13

Substance: define and FIXED composition and cannot be separated into other kinds of matter through physical methods (ex: pure water or Salt)
Mixture: a combination of 2 OR MORE substances (phases) that CAN be separated into substances by physical methods

Question 14

What can be classified further as a pure substance?

Answer 14

Compound: can be broken down CHEMICALLY (ex: H2O can be broken into H and O)
Element: cannot be broken down any further (ex: H2- just hydrogen through and through)

Question 15

What is the formula for Barium Sulfide?

Answer 15

BaS

Question 16

What is the name of Na3N

Answer 16

Sodium Nitride

Question 17

What is the name of MgF2

Answer 17

Magnesium Fluoride

Question 18

When are roman numerals used in naming ionic compounds? Think of an example

Answer 18

If the cation can have a VARIETY OF CHARGES
ex: FeCl3 –> Iron (III) Chloride

Ex: Copper (II) Oxide–> CuO
Ex: Copper (I) Oxide —>Cu2O

Question 19

What are polyatomic ions?
(2/6 examples to know)

Answer 19

a group of atoms held together by COVALENT BONDS that overall carry a charge
EX: NO3^(-1) Nitrate
Ex: NH4^(+1) Ammonium

Question 20

What is the formula of Lead(II) Hypochlorite

Answer 20

Pb(ClO)2

Question 21

What are the 2 possible solutions for Tin Sulfide?

Answer 21

SnS or SnS2

Question 22

What is name of Al(NO3)3

Answer 22

Aluminum Nitrate

Question 23

What is name of PF3?

Answer 23

Phosphorous trifluoride

Question 24

What is the formula of FeBr2

Answer 24

Iron (II) Bromide

Question 25

What is formula for CaSO4

Answer 25

Calcium sulfate

Question 26

What is the balanced formula for when sodium metal reacts with chlorine gas to create sodium chloride

Answer 26

2 Na (s) + Cl2 (g) --> 2 NaCl (s)

Question 27

The comustion of octane, C8H18, the major component of gasoline, to produce carbon dioxide and water vapor

Answer 27

2 C8H18 (l) + 25 O2 (g) → 16 CO2 (g) + 18 H2O (g or l)

Question 28

Where does radon come from if found in a house? How can they be reduced?

Answer 28

Soil or bedrock under the house due to DECAY OF Uranium-238 seeping through Can be sealed or depressure basement via vents

Question 29

How many pairs of electrons will be in a lewis structure of CH2F2?

Answer 29

10 pairs- around central carbon atom

Question 30

How many Pairs will ozone have on its Lewis structure?

Answer 30

9 pairs

Question 31

Copper can form several ionic compounds with oxygen. Which of the following ionic compounds is Copper (II) Oxide? A. Cu2O B. CuO C. Cu4O3 D. CuO2

Answer 31

CuO

Question 32

What is the formula for Iron (III) oxide

Answer 32

Fe2O3

Question 33

What is the balanced equation for the combustion of heptane in the presence of oxygen?

Answer 33

1 C7H16 (l) + 11 O2 (g) ----> 7 CO2 (g) + 8 H2O (g)

Question 34

What molecules, that affect air quality indix (AQI) can be produced by cars and lightning?

Answer 34

NO2 and O3

Question 35

From the following description, write the balanced chemical equation that describes the reaction (including physical states): “Iron metal will react with chlorine gas at high temperature to form the ionic solid, iron(III) chloride, as the only product”

Answer 35

2 Fe (s) + 3 Cl2 (g) ---> 2 FeCl3 (s)

Question 36

If a wavelength is 400 nm what will the wavelength be in m?

Answer 36

4.00 x 10^-7

Question 37

If the frequency of a wave is 5.2 x 10^14 Hz what will the wavelength in m be?

Answer 37

5.76 x 10^-7

Question 38

What is the constant for speed of a wave

Answer 38

3 x 10^8 m/s

Question 39

What is name for CuSO4

Answer 39

Copper (II) sulfate

Question 40

What is the relationship between frequency and wavelength? What is the relationship between energy & frequency?

Answer 40

Inverse relationship energy and frequency have an equal relationship

Question 41

If the frequency of a photon is 4.8 x 10^6 what region is it on the EG spectrum? Would it have higher or lower energy than a photon in the IR region

Answer 41

1. Radiowave region 2. It would be lower energy than IR

Question 42

What is the lewis strucutre for SO2 (sulfur dioxide)

Answer 42

O w 2 pairs of dots connected to S with double bond. S has 1 pair of dots. S connected to O with single bond and that O has 3 pairs of dots (OCTECT RULE FOR S)

Question 43

What gas CAN pass through a catalytic converter and reach the atmosphere?

Answer 43

CO2

Question 44

Sodium and potassium ions can be added to silica to create stronger glasses, what is the name of the group of the periodic table these elements belong to?

Answer 44

Alkali metals

Question 45

What is the difference between a covalent and ionic bond?

Answer 45

Covalent: attraction between 2 nuclei and a SHARED PAIR of electrons Ionic: attraction between oppositely charged electrons