4,347 Answered Questions for the topic Science
Science Chemistry
02/19/23
Explain the significance of the black bands that are found in the emission spectra
Follows
•
1
Expert Answers
•1
![]()
Science Chemistry
02/19/23
Can you tell which out of hydrogen, white light or fluorescent light has the greatest number of electron transitions (ie: quantum leaps) based on their emission spectra? Explain why or why not!
Follows
•
0
Expert Answers
•1
![]()
Science
02/14/23
Where is the energy in the products of photosynthesis?
A) The bonds of a glucose molecule store chemical energy.B)The bonds of an oxygen molecule store electric energy.C)The oxygen has a lot of kinetic energy.D)Glucose has a lot of mechanical energy.
Follows
•
1
Expert Answers
•1
![]()
The experiment is repeated at 500˚C. How would the following change (qualitatively) at the new temperature (explain your answer)?
This reaction was originally done at a temperature of 250K, but now it is being done at 500K.4PH3 (g) ➞ P4 (g) + 6H2 (g)a. The half-life of phosphine. b. The rate law for phosphine decomposition....
more
Follows
•
2
Expert Answers
•1
![]()
Assume the rate of disappearance of PH3 is 2.5 x 10^-3 M/s at 20 seconds.
4PH3 (g) ➞ P4 (g) + 6H2 (g)a. What is the rate of appearance of P4 at 20 seconds?b. How will the rate of P4 appearance change (qualitatively) as the reactionprogresses?Justify each answer!
Follows
•
2
Expert Answers
•1
![]()
Where will this image be located?
The equation connecting s, p, and f for a simple lens can be employed for spherical mirrors, too. A concave mirror with a focal length of 6 cm forms an image of a small object placed 11 cm in front...
more
Follows
•
1
Expert Answers
•1
![]()
A camera is equipped with a lens with a focal length of 31 cm. When an object 1.9 m (190 cm) away is being photographed, what is the magnification?
Follows
•
2
Expert Answers
•1
![]()
A camera is equipped with a lens with a focal length of 21 cm. When an object 1.7 m (170 cm) away is being photographed, how far from the film should the lens be placed?
Follows
•
2
Expert Answers
•1
![]()
What is the magnification of the image?
The focal length of a diverging lens is negative. If f = −18 cm for a particular diverging lens, where will the image be formed of an object located 43 cm to the left of the lens on the optical axis?
Follows
•
1
Expert Answers
•1
![]()
Compute the frequency (in MHz) of an EM wave with a wavelength of 1.4 in. (0.0356 m).
Follows
•
1
Expert Answers
•1
![]()
The blackbody radiation emitted from a furnace peaks at a wavelength of 7.3 10-6 m (0.0000073 m). What is the temperature inside the furnace?
Follows
•
1
Expert Answers
•1
![]()
how many turns must there be in the output coil?
The generator at a power plant produces AC at 26,000 V. A transformer steps this up to 355,000 V for transmission over power lines. If there are 2,250 turns of wire in the input coil of the...
more
Follows
•
1
Expert Answers
•1
![]()
02/11/23
Provide the structures of the 1,2- and 1,4- addition products obtained from the following reaction.
Provide the structures of the 1,2- and 1,4- addition products obtained from the following reaction. Make sure to label which is 1,2- and which is 1,4-, which is kinetic and which is the...
more
02/11/23
What is the major organic product obtained from the following reaction?
What is the major organic product obtained from the following reaction?
Follows
•
1
Expert Answers
•1
![]()
02/11/23
Provide a brief explanation of why the dianion (below) is antiaromatic.
Provide a brief explanation of why the dianion (below) is antiaromatic. Your answer should identify the hybridization of each carbon atom and account for which electrons are in the pi system.
Follows
•
1
Expert Answers
•2
![]()
02/11/23
What is the product of the following Diels-Alder Reaction?
What is the product of the following Diels-Alder Reaction? Make sure to include the stereochemistry in your answer.
02/11/23
What is the major organic product obtained from the following reaction?
What is the major organic product obtained from the following reaction?
Follows
•
1
Expert Answers
•1
![]()
02/11/23
Why is the structure provided aromatic?
Provide a brief explanation of why the structure below is aromatic. Your answer should identify the hybridization of the oxygen atom and the carbon with the + charge, and account for which...
more
02/11/23
Drawing of resonance structures
Please help with the following problem - Draw two resonance structures of the reactive intermediate that accounts for the formation of 1,2- and 1,4-addition products upon the reaction of...
more
Follows
•
1
Expert Answers
•1
![]()
02/11/23
Which has the greatest heat of hydrogenation?
Which of 1,3-cyclohexadiene and 1,4-cyclohexadiene has the greatest heat of hydrogenation (i.e., the most exothermic reaction with H2 in the presence of a catalyst). Provide a brief explanation for...
more
Follows
•
2
Expert Answers
•1
![]()
Science Chemistry
02/10/23
Propane (C3H8) Burns in the presence of oxygen to produce carbon dioxide and water. what mass of propane will combust using 8.35 moles of oxygen?
C3H8 + 5O2 --> 3CO2 + 4 H2O
Follows
•
2
Expert Answers
•1
![]()
What is the size of the smallest feature observable in human tissue when examined with 10-MHz ultrasound?
Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of the ultrasound waves themselves. What is the size of the smallest feature observable in human...
more
Follows
•
1
Expert Answers
•1
![]()
Approximately how many times louder is a 170-dB sound than a 90-dB sound?
Follows
•
1
Expert Answers
•1
![]()
Science Chemistry
02/09/23
Can you help me with this enthalpy problem?
The overall reaction in a commercial heat pack can be represented as shown below.4 Fe(s) + 3 O2(g) 2 Fe2O3(s) ΔH = -1652 kJ(a) How much heat is released when 3.56 mol iron is reacted with...
more
Follows
•
1
Expert Answers
•1
![]()
Still looking for help? Get the right answer, fast.
Ask a question for free
Get a free answer to a quick problem.
Most questions answered within 4 hours.
OR
Find an Online Tutor Now
Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.
