Study Guide TEST DAY: DEC 4TH 7TH

Study Guide

Calculate the total heat

energy needed to convert 20 g

of ice at -100°C to -60°C.

Specific Heat(SOLID-ICE) = 2.1 Joules/g°C Specific Heat(LIQUID-WATER) = 4.2 Joules/g°C Specific Heat(GAS-VAPOR) = 2.02 Joules/g°C Heat of Fusion = 340 Joules/g

Answer

Q=mCAT

AT= Change in Temp = Final – Initial

AT = -60C - (-100C) = -60C + 100C = 40C

(20g)(2.1J/gC)(40C) =

1,680J

List all the

properties of water

and why they are

essential for life on

Earth.

Answer

Cohesion: Allows water to stick together and makes Surface tension

Adhesion: Allows water to stick to other things and makes Capillary Action

Moderate Temperature: Allows water not to boil in the summer or freeze in the

winter

Density: Allows ice to float creating a protective barrier for aquatic life

Universal Solvent: Allows water to dissolve MOST substances and transport

Calculate the total heat energy needed to convert 100 g of

ice at -50°C to steam at 110°C.

Specific Heat(SOLID-ICE) = 2.1 Joules/g°C

Specific Heat(LIQUID-WATER) = 4.2 Joules/g°C Specific Heat(GAS-VAPOR) = 2.02 Joules/g°C Heat of Fusion = 340 Joules/g

Answer

 1. q=mCAT AND q=mHf AND q=mHv

 2. AT(change in Temp.) = Final Temp. - Initial Temp.

Solid: 0C - (-50C) = 50C Liquid: 100C – 0C = 100C Gas: 110C – 100C = 10C  3. Solid: (100g)(2.1J/gC)(50C) = 10,500J Heat of Fusion: (100g)(340J/g) = 34,000J Liquid: (100g)(4.2J/gC)(100C) = 42,000J Total of Top 3: 10,500J + 34,000J + 42,000J = 86,500J Heat of Vap.: (100g)(2270J/g) = 227,000J Gas: (100g)(2.02J/gC)(10C) = 2020 J Overall Total: 86,500J + 227,000J + 2020J = 315,520J

What is happening to hydrogen bonds at

the two plateaus and why is temperature

not increasing even though heat is?

Answer

Volume Definite Volume

Compressibility Not compressible

Density High

Conductivity Conducts Electricity

Reactivity Very Reactive

Melting Point High

Boiling Point High

Lily is given an unknown substance in class and her teacher has asked her to figure out

whether it is a metal or nonmetal. Doing some tests, she discovers some information about the substance:

With the information listed in the table what is the substance likely to be, metal or nonmetal? Explain why.

Which subatomic particles in an atom contribute to its atomic mass and which of them have little or no impact ?

▪a. Electrons contribute to the atomic mass of an atom while

protons and neutrons have little or no impact on the atom's atomic mass.

▪b. Protons and neutrons contribute to the atomic mass of an

atom while electrons have little or no impact on the atom's atomic mass.

▪c. Protons and electrons contribute to the atomic mass of an

atom while neutrons have little or no impact on the atom's atomic mass.

▪d. Electrons and neutrons contribute to the atomic mass of an

atom while protons have little or no impact on the atom's atomic mass.

Which statement below is true?

▪a. The subatomic particles with a negative charge are

electrons, those with a positive charge protons and those with no charge neutrons.

▪b. The subatomic particles with a negative charge are

electrons, those with a positive charge neutrons and those with no charge protons.

▪c. The subatomic particles with a negative charge are

protons, those with a positive charge electrons and those with no charge neutrons.

▪d. The subatomic particles with a negative charge are

neutrons, those with a positive charge protons and those with no charge electrons.

1. How many electrons are in the atom in the picture?

a. 1 b. 4 c. 5 d. 3

2. How many neutrons are in the atom in the picture?

a. 1 b. 4 c. 5 d. 3

3. How many protons are in the atom in the picture?

a. 3 b. 5 c. 4 d. 1

4. How many neutrons are in the atom in the picture?

a. 6 b. 5 c. 7 d. 0

5. How many Protons are in the atom in the picture?

a. 5 b. 6 c. 0 d. 1

6. How many electrons are in the atom in the picture?

How does a theory differ

from a law?

▪ Theory: Explanation ▪ Law: Observation

▪ Electron: JJ Thomson, Cathode Ray Tube ▪ Neutron: Chadwick, Gold Foil

Bell Ringer

Given the following Isotope: How many Neutrons does it have?

Questions

2. Calculate the energy (E) and wavelength of a photon of

light with a frequency(v) of 6.165 x 10

Hz.

Answers

E=hv

c/v=wavelength

E = (6.63 x 10

_{Js)(6.165 x 10}

_Hz)

W = (3.0 x 10

_{m/s)/(6.165 x 10}

_Hz)

Bell Ringer

Exit Slip

Given the following Isotope:

Name the Following

Compounds:

Identify the type of reaction(Ionic, Molecular, Transition) 1.CuF 2.CdI₂ 3.KO 4.NO 5.NF₃

Answer

1. CuF : Copper (I) Fluoride(Transition) 2. CdI₂ : Cadmium (II) Iodine (Transition) 3. KO : Potassium Oxide (Ionic)

4. NO : Nitrogen Monoxide (Molecular) 5. NF₃ : Nitrogen Triflouride (Molecular)

Write the

Formula for

the

following

Compounds

Answer

C

₄

H

₁₀

O+O

₂

→ CO

₂

+H

₂

O

EXAMPLES

1. How many moles are present in 34 grams of Cu(OH)₂?

2. How many moles are present in 2.45 x 1023 molecules of CH₄?

ANSWER

1. Mass(g) / Molar Mass = 0.35 moles

2. Particles, molecules, or Atoms / Avogadro's Number (6.02 x 1023) = 0.41

moles

3. Particles, molecules, or Atoms / Avogadro's Number (6.02 x 1023) = moles x

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