oo T-Mobile LTE 9:43 AM Touch to return to call 06:48 bbhosted.cuny.edu 89% . (7
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oo T-Mobile LTE 9:43 AM Touch to return to call 06:48 bbhosted.cuny.edu 89% . (7) The green color of the Statue of Liberty is due to a A) elemental B)chemicalCanalytcal D molecular E) physical change to the copper metal Answer( (8) Which of the following is an imensive propernty? A)assB) length C) volume D)meing point E)eat capacity Answer ( 9) What ase the two classes of pure substances? A) elements and atoms D) chemical and physical bomogencous and heterogencous B) compounds and molecules C) elements and compounds Answer( (10) How many significant figures does the namber 5.06305 x 10 contain? Answer( (11) Which o the Sollowing measured volumes has the most uncertainty? A) 10 ml. B) 100 mL C) 1000 ml D) 10.000 ml E) All values harve the same degroe of uncertainty Answer( (12) What is the number 0 0062985632 writlen in scientific notation to three significant figes B) 6.00 x 10 C16.29 × 10', D)6.299 10 E)630x 10 Answer( 13) Select the answer that best expresses the resul efdhe Sollowing calculation 1.86 +2464-79.9208-? A) 168 B) 1683 C)16834 D) 168.339 E 168.3392 Answer( (14) Select the answer that best expresses the result of the ollowing caloulation: 186 x 2464-7458.304 A) 458304 x 102 B) 4.58304 x 10' C) 438 x 10"D) 4.58 x 10, E) 45004 Answer( (15) What are the three primary particles Sound in an atom A) ncutron, positron, and electron B) electron, scutron, and proton C) electron, proton, and nocleon D) positron, electron, and nuclcon E) peoton, electron, and meutrinoExplanation / Answer
7. B) Chemical change in copper metal
Chemical change is a change that result in the formation of new compound. Here the green color of statute is due to corroded copper.
Cu metal on liberty statue reacts with O2 present in the oxygen and correded to copper oxide (green).
8) D) Melting point
Intensive property: If the property of sample doesn't change when we take away some sample from it then that property is said to be intensive property.
9) C) Elements and compounds
10) The given value is in scientific notation (Value is getting blurred if i zoom it)
5.06605*104 (whateve be the 10 power value) we have to count only digits in the value
so 5.06605 have 6 so number of significant figures =6
11) a)
Less the number of decimal places after decimal more the uncertainity
In option A) there are no decimal places so it will have most uncertainity
12)
0.0062985632 = 6.30*10-3
First let us round given value to 3 sig fig = 0.00630
then we have to write in scientific notation
So answer is E) 6.30*10-3
13) 1.86+246.4-79.9208 = 168.3392 we are getting this value, but this not the answer
We have to write in correct significant figures
In the question least number of significant figures present in 1.86 which is equal to 3
So our answer has to contain 3 sig figures
So answer will be 168.3392 by rounding to 3 sig. fig = 168
It is A)
14) C)
1.86*246.4 =458.304 = 4.58x102
It is just like previous example
15) B) Primary particles in an atom is electron, proton and neutron
16) B)
17) E) is false
Elements in the same group has similar propeties
18) A)
loss of an electron K gives the positive charge on K (K+)
19) A)
Columns in the periodic table are called groups
20) B) is false. They have difference atomic numbers so they will have different electronic configurations
21) A) transitional elments.
22) B) is false
The three p orbitals have same energy
23) E)
The electrons must have opposite spin
24) C) is false
Chlorine atom has 7 valence electrons 3s2 3p5
25) C)
Cl- ion: negative charge indicates addition of single electron in the valence shell
We have seen that Cl atom has 7 valence electron now one electron is added
So Cl- ion has 8 valence electrons.
26) C)
Br- is from 4 th period so its valence electron configuration is : 4s2 4p6
Not equal to Ar
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