Consider the Wittig reaction of p‑anisaldehyde with excess chloride in base to make (Z)‑p‑methoxystilbene. chloride (388.9 grams per moles) and p-anisaldehyde (136.2 grams per mole, density equals 1.12 grams per milliliter) react to form p-methoxystilbene (210.1 grams per mole). A reaction was performed in which 0.300 mL of p‑anisaldehyde was reacted with a slight excess of chloride to make 0.449 g of p‑methoxystilbene. Calculate the theoretical yield and percent yield for this reaction.

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answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.