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Two charges of +8.0mC and -6.0 mC attract each other with a force of 3.0x103 N in a vacuum. What is the distance between the charges.
Find the electrostatic force between charges of +2.0 C and +5.0 C separated by a distance of 75m in a vacuum.
A lead pellet is propelled vertically upward by an air rifle with an initial speed of 50 ft/s. Find its maximum height ?
A stone is thrown upward with an initial speed of 48 ft/s.
A. what will its maximum height be ?
B. where will it be after 1 s ?
A stone is dropped into a well and 4 seconds later the sound of the splash is heard. If sounds travel at a speed of 340 m/s, how deep is the well ?
The temperature rises by 20°F what is the rise in Celsius scale
14. 32. Atoms with unpaired electrons are called _________.
a. Lone pair
b. Fake atoms
c. Single atoms
d. Paramagnetic
15. 34. Short chain alkanes are prepared through ________.
a. Saponification
b. Catalytic cracking
c. Hydration
d. Oxidation
16. 38. Which of the following represents a non-polar covalent bond?
a. Hydrogen - Oxygen
b. Carbon - Carbon
c. Carbon - Nitrogen
d. Lithium - Fluorine
17. 39. The reaction of water with alkene to produce an alcohol is a/an ____ reaction.
a. Saponification
b. Combustion
c. Condensation
d. Addition
18. 40. Which one of the formulas for ionic compounds below is incorrect?
a. SrCl2
b. Al3P2
c. AlCl3
d. Cs2S
9. 19. In the ground state of a cobalt atom there are ___ unpaired electrons and the atom is ___.
a. 3, paramagnetic
b. 2, diamagnetic
c. 5, paramagnetic
d. 0, diamagnetic
10. 20. Which of the following bond is the strongest?
a. carbon – hydrogen bond
b. carbon – carbon triple bond
c. carbon – nitrogen bond
d. carbon – carbon single bond
11. 25. Saponification of fats needs a strong ________ to proceed to completion.
a. halogen
b. acid
c. catalyst
d. base
12. 28. Which of the following elements can only form one bond (alkane) in a Lewis structure?
a. Oxygen
b. Hydrogen
c. Carbon
d. Aluminum
13. 29. Which element will have 18 electrons in its Lewis dot symbol?
a. Argon
b. Carbon
c. Boron
d. Phosphorus
The resonant frequency of a closed air column is known to depend on the pressure and density of the air and length of the air column. How do these quantities relate?
A body of volume 36cc floats with ¾ of its volume submerged in water. The density of body is
a) 0.25 g/cc
b) 0.75 g/cc
c) 0.9 g/cc
d) 0.1 g/cc
