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3 years ago

13

A chemical reaction in which two or more substances undergo a chemical union to form a more complex substance is a _______ react

ion.
A. substitution
B. combination
C. decomposition
D. double replacement

2 answers:

Georgia [21]3 years ago

7 0

I believe the correct answer is B. Combination.

Andreas93 [3]3 years ago

7 0

The answer is B. combination

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3 years ago

In NMR if a chemical shift(δ) is 211.5 ppm from the tetramethylsilane (TMS) standard and the spectrometer frequency is 556 MHz,

Vika [28.1K]

Answer:

The answer is: 11759 Hz

Explanation:

Given: Chemical shift: δ = 211.5 ppm, Spectrometer frequency = 556 MHz = 556 × 10⁶ Hz

In NMR spectroscopy, the chemical shift (δ), expressed in ppm, of a given nucleus is given by the equation:

$\delta (ppm) = \frac{Observed\,frequency (Hz)}{Frequency\,\, of\,\,the\,Spectrometer (MHz)} \times 10^{6}$

$\therefore Observed\,frequency (Hz)= \frac{\delta (ppm)\times Frequency\,\, of\,\,the\,Spectrometer (MHz)}{10^{6}}$

$Observed\,frequency= \frac{211.5 ppm \times 556 \times 10^{6} Hz}{10^{6}} = 11759 Hz$

<u>Therefore, the signal is at 11759 Hz from the TMS.</u>

6 0

3 years ago

Help asap thank u!!!!

9966 [12]

I think the answer is the last answer at the bottom

5 0

2 years ago