What is the structure of a hydrocarbon that has $\mathrm{M}^{+}=120$ in its mass spectrum and has the following $1 \mathrm{H}$ NMR spectrum? 7.25 $\delta(5 \mathrm{H}, \text { broad singlet); } 2.90 \delta(1 \mathrm{H}, \text { septet, } J=7 \mathrm{Hz}) ; 1.22 \delta(6 \mathrm{H},\text { doublet, }$ $J=7 \mathrm{Hz})$
Answer:
False
Explanation:
it is very rare to get hyposmia
Answer:
white
Explanation:
This experiment causes lines of different colors because the constructive interference depends on the wavelength, so for different wavelength, the position of the maximum will be different.
Now, in diffraction fo a single slit we always have a central maximum (for all the colors)
This means that after the diffraction, we will have that all the colors have a maximum in the center, which will produce white light again, then the color of the central image is white
Answer:
22 N
Explanation:
The box is moving, so there is kinetic friction.
The speed is constant, so there is no acceleration.
Draw a free body diagram of the box. There are four forces.
Normal force Fn pushing up.
Weigh force mg pulling down.
Applied force F pushing right.
Friction force Fn μk pushing left.
Sum the forces in the y direction:
∑F = ma
Fn − mg = 0
Fn = mg
Sum the forces in the x direction:
∑F = ma
F − Fn μk = 0
F = Fn μk
F = mg μk
F = (11.2 kg) (9.8 m/s²) (0.200)
F = 22.0 N
Answer: Independent variable: The amount of coffee grounds.
Dependent variable: The taste of the coffee.
Controlled variables: The kind of coffee, the same percolator, the same amount and type of water, the same perking time, and the same electrical sources.
Explanation: In an experiment the independent variable is the variable that you change, the dependent variable is the variable that you are testing to see if it will change because of the change you made, and the controlled variables are the variables that stay the same.
