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3 years ago

Which statements below are an appropriate hypothesis in response to this question? Check all that

1 answer:

5 0

The correct statements are b, c, and e.
A hypothesis is defined as a tentative or proposed explanation for the occurrence of any phenomenon.
It is usually based on a very less number of pieces of evidence and provides the first step for further classification.
The hypothesis must be testable so that it can be accepted or rejected on the basis of scientific methods.
Thus, the correct statements are b, c, and e.

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(6 pt) Match each word from Column A with the correct definition from Column B. Column A Column B 1. element 2. compound 3. reac

Marat540 [252]

1. D
2. C
3. F
4. E
5. A
6. B

3 0

2 years ago

In IR spectroscopy, we normally talk about "frequencies" when in reality we are referring to wavenumbers. What is the mathematic

Svetach [21]

Answer:

Here's what I get.

Explanation:

(b) Wavenumber and wavelength

The wavenumber is the distance over which a cycle repeats, that is, it is the number of waves in a unit distance.

$\bar \nu = \dfrac{1}{\lambda}$

Thus, if λ = 3 µm,

$\bar \nu = \dfrac{1}{3 \times 10^{-6} \text{ m}}= 3.3 \times 10^{5}\text{ m}^{-1} = \textbf{3300 cm}^{-1}$

(a) Wavenumber and frequency

Since

λ = c/f and 1/λ = f/c

the relation between wavenumber and frequency is

$\bar \nu = \mathbf{\dfrac{f}{c}}$

Thus, if f = 90 THz

$\bar \nu = \dfrac{90 \times 10^{12} \text{ s}^{-1}}{3 \times 10^{8} \text{ m$\cdot$ s}^{-1}}= 3 \times 10^{5} \text{ m}^{-1} = \textbf{3000 cm}^{-1}$

(c) Units

(i) Frequency

The units are s⁻¹ or Hz.

(ii) Wavelength

The SI base unit is metres, but infrared wavelengths are usually measured in micrometres (roughly 2.5 µm to 20 µm).

(iii) Wavenumber

The SI base unit is m⁻¹, but infrared wavenumbers are usually measured in cm⁻¹ (roughly 4000 cm⁻¹ to 500 cm⁻¹).

8 0

3 years ago

In chemistry, what varies with the number of molecules present in a sample of a particular substance?

Neko [114]

Answer: concentration

Explanation:

Concentration refers to the amount of a substance present in a sample. The more molecules of a substance present in a sample, the greater its concentration. The less molecules of a substance in a sample, the lesser the concentration. We are often concerned about analytically determining the concentration of a substance using diverse analytical methods in chemistry.

3 0

3 years ago

A man weighing 48 N climbs 82.0 meter ladder how much work is done

Karolina [17]

Heeeyyyyyyyy........

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3 years ago

What mass of copper is consumed in the reaction with hydrochloric acid if 10.0 g of gas is collected?

brilliants [131]

Answer:

317 g

Explanation:

Cu + 2HCl --> CuCl2 +H2

1 : 2 1 : 1

1 mole of Cu = 63.5 g

1 mole of H2 = 2g

1 mole Cu produces = 1 mole of H2

63.5 g of Cu produces = 2 g of H2

10 g of H2 will be produced from = (63.5/2)*10 = 317 g of Copper

4 0

3 years ago