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Physical Science Notes 416-436
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Answers to Review Questions and Practice Test

If you have any questions on the questions or answers supplied here, or have questions feel free to contact us on the "Contact Us" page.
 
1) Answer: B) Perform the litmus paper test on each liquid
Not the answers: A), C), D)
Because: A)> Physical propertie
              C)> Density
              D)> H2O present = aqueous
 
2) Answer: C) 2.8 g/ml
Not the answers: A), B), D)
Because: To find density you use the equation: D= M/V, in this case you FIRST have to subtract: 19.4ml- 15.0ml then with then answer: 4.4ml which is your volume. Your mass is 12.32g, so fill in the Equation: D= 12.32g/4.4ml, your answer is 2.8 g/ml.
 
3) Answer: D)This substance was formed by the reaction of oxygen gas and magnesium
Not the answers: A), B), C)
Because: A)> A lot of things have high densities
              B)> Chemical Change
              C)> Solubility
 
4) Answer: D) A pond freezes over
Not the answers: A), B), C)
Because: A)> Chemical Change
              B)> Chemical Change
              C)> Chemical Change
 
5) Answer: C) The number of neutrons
Not the answers: A), B), D)
Because: A)> Not affected by isotopes
              B)> Not affected by isotopes
              D)> Not affected by isotopes
 
6) Answer: C) Is it a compound because the mass has increased
Not the answers: A), B), D)
Because: A)> If mass increases it is a compound, NOT an element
              B)> Colour change does not help e.g: Red hair, Red shirt etc.
              D)> Colour change does not help e.g.: Red hair, Red shirt etc.
 
7) Answer: A) Water is formed from hydrogen gas and oxygen gas
Not the answers: B), C), D)
Because: B)> Electrons were discoverd by J.J. Thomson, he came after Dalton
              C)> The nucleus was discoverd by Ernest Rutherford, after Dalton
              D)> Static Electricity was discovered by J.J. Thomson
 
8) Answer: B) 1 and 3
Not the answers: A), C), D)
Because: Element 1=  Beryllium(Be) is the Alkaline Earth Metals
              Element 2= Sodium (Na) is the Alkali Metals
              Element 3= Calcium (Ca) is the Alkali Metals
              Element 4= Silicon (Si) is in group 4A (IVA)
 

9) Answer: B)   All alkali metals react with water.

Not the answers: A), C), D)

Because: A) Halogens only have 7 valence electrons

C) The Elements in VIIA are the Noble/Inert gasses, they have a full last electron shell (8 valence e-) therefore they do not react

D) Alkaline earth metals have two (2) electrons in their outer most shell

 

 

 

Periodic Table Test

 

1) Answer: C) Only on the right side

Not the answers: A), B), D)

Because: Nonmetals are found only on the right side of the Periodic Table of the elements.

 

2) Answer: C) 2

Not the answers: A), B), D)

Because: A) The last energy level contains 32 electrons

C) The third energy level contains 18 electrons

D) The second energy levels contains 8 electrons

 

3) Answer: B) Mendeleeve

Not the answers: A), C), D)

Because: A) Theory of the Atom

C) Atomic Model

   D) Radiation research

 

4) Answer: D) Protons, neutrons

Not the answers: A), B), C)

Because: A) Electrons move around the Atom

   B) Electrons move around the Atom

   C) Atoms are the particles

 

5) Answer: D) Alkali Metals

Not the answers: A), B), C)

Because: A) 7A group (F, Cl, Br, I, At)

   B) 8A group (He, Ne, Ar, Kr, Xe, Ra)

   C) 2A group (Be, Mg, Ca, Sr, Ba, Ra)

 

6) Answer: B) Noble/Inert Gasses

Not the answers: A), C), D)

Because: A) 2A group (Be, Mg, Ca, Sr, Ba, Ra)

   C) 6A group (O, S, Se, Te, Po)

   D) 1A group (H, Li, Na, K, Rb, Cs, Fr)

 

7) Answer: A) Lustrous, ductile, malleable

Not the answers: B), C), D)

Because: B) Properties of nonmetals

   C) Properties of nonmetals

   D) Nonmetals are on the right side of the table

 

8) Answer: D) Number of electrons in last energy level

Not the answers: A), B), C)

Because: A) Dependant on the number of neutrons

   B) Told by periods

   C) Atomic mass Atomic number

 

9) Answer: C) Number of energy levels

Not the answers: A), B), D)

Because: A) Not relevant

B) Told by groups

D) Electrons in last energy level

 

10) Answer: A) Without cuts

Not the answers: B), C), D)

Because: B) Is a molecule

   C) Not many pieces

               D) Aristotles theory

 

 

Balancing Chemical Equations

Zn + 2HCl ==> ZnCl2 + H2

Cu + 2AgNO3 ==> Cu(NO3)2 + 2Ag

2Fe + 3Cl2 ==> 2FeCl3

2H2 + O2 ==> 2H2O

3Fe + 2O2 ==> Fe3O4

CaO + H2O ==> Ca(OH)2 Already Balanced!!

3Mg + 2P ==> Mg3P2

Na2O + H2O ==> 2NaOH

CoCO3 ==> CoO + CO2 Already Balanced!!

2K3N ==> 6K + N2

NaOH + HCl ==> NaCl + H2O Already Balanced!!

2CuS + 3O2 ==> 2CuO + 2SO2

2Bi + 3Cl2 ==> 2BiCl3

2Al + 6HCl ==> 2AlCl3 + 3H2

Al2(SO4)3 + 3BaCl2 ==> 3BaSO4 + 2AlCl3

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