8140

Chemistry Inorganic Chemistry Level: Misc Level

How many molecules of water are produced by the combustion of 40.00 g of butane?


8136

Physics Radioactivity Level: Misc Level

When an alpha particle is ejected from a nucleus,the nucleus then has less

A.mass.

B.charge.

C.both of these.

D.neither of these.


8134

Physics Radioactivity Level: Misc Level

When a beta particle is ejected from a nucleus, the nucleus then has a greater

A.charge.

B.mass.

C.both of these.

D.neither of these.


8133

Physics Modern Physics Level: Misc Level

Electric forces within an atomic nucleus tend to

A.hold it together.

B.push it apart.

C.neither of these.


8132

Physics Doppler Effect Level: Misc Level

On a day when the wind is blowing 39.5 km/hr from east to west, a fire engine is headed toward you from the west at 105 km/hr and you are headare headed toward the fire engine at 92.4 km/hr. If the engine has a 1460 Hz siren and the speed of sound is 340 m/s, what frquency do you hear?Answer in units of Hz.


8131

Physics Doppler Effect Level: Misc Level

Assume the speed of sound in air to be 344 m/s.A bat moving at 6.3 m/s is chasing a flying insect.The bat emits a 55 kHz chirp and receives back an echo at 55.22 kHz.At what speed is the bat gaining on its prey?Answer in units of m/s.


8130

Physics Doppler Effect Level: Misc Level

An ambulance is traveling North at 60.7 m/s, approaching a car that is also traveling North at 30.6 m/s. The ambulance driver hears his siren at a frequency of 959 cycles/s.At what freqency does the driver of the car hear the siren?Answer in units of m.


8129

Physics Waves And Oscillations Level: Misc Level

Earthquakes produce two kinds of seismic waves; The longitudinal primary waves(called p waves) and transverse secondary waves(called s waves).Both s waves and p waves travel through Earth,s crust and mantle, but at different speeds; the p waves are faster than s waves, but their exact speeds depend on depth and location.Assume the p waves speed to be vp=8580 m/s while the s waves travel at a slower speed of vs=5570 m/s. suppose a seismic station detects a wave and then ^t=93.5 s later detects an s wave.How far away is the earthquake center?Answer in units of km.


8128

Physics Waves And Oscillations Level: Misc Level

What is the frequency of the wave?Answer in units of Hz.


8127

Physics Waves And Oscillations Level: Misc Level

What is the period of the wave?Answer in units of s.


8116

Chemistry Organic Chemistry Level: Misc Level

What is the major product in each of the following reactions?


8115

Chemistry Organic Chemistry Level: Misc Level

Complete the following drawings to show (a) 1R,2R-difluorcyclohexane and (b) meso-1,2-dichloro-1,2-diphenylethane;


8114

Chemistry Organic Chemistry Level: Misc Level

Draw complete structures for;

(a) isopropyl fluoride 

(b) cis-1,3- dichlorocyclohexane


8113

Chemistry Organic Chemistry Level: Misc Level

For the SN2 reaction,draw the transition state. Pay attention to the geometry and the partial charges.


8112

Chemistry Organic Chemistry Level: Misc Level

For the SN1 reaction, draw the structure of the intermediate, Pay attention to the geometry.


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