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tester [92]
3 years ago
9

Whats the pure substance that cannot be separated into any other substances

Chemistry
2 answers:
777dan777 [17]3 years ago
8 0
A pure substance that cannot be separated into simpler substances by physical or chemical means. A pure substance composed of two or more elements that are chemically combined.
ryzh [129]3 years ago
8 0
An element is a pure substance that cannot be separated into any other substances.
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Which words or phrases identify layers of groundwater?
____ [38]

The ground water refers to water present in the under earth in the cracks or pores or similar spaces.We majorly depends upon this sources of water specially in rural area.

It helps in irrigation and also serve as drinking water supply.

The words or phrases which identify layer of ground water are:

a) water table: the uppermost water saturated layer

b) kettle lake: it is an underground lake (not ground water)

c) Saturation zone : this is the zone of water below the water table

d) undergound lake: this is kettle lake (not ground water)

e) sink hole: Not a layer of ground water

So the layers of ground water are

a) water table

b) saturation zone

5 0
3 years ago
Read 2 more answers
If a plant produces 3.21 mol of c6h12o6, how many moles of co2 are needed?
xenn [34]
Photosynthesis is the process by which CO₂ is converted to an organic compound. The complete reaction is as follows;
6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂
stoichiometry of CO₂ to C₆H₁₂O₆ is 6:1
For 1 mol of C₆H₁₂O₆ to be formed - 6 mol of CO₂ is required 
Therefore for 3.21 mol of C₆H₁₂O₆ to be formed - 6 x 3.21 mol of CO₂ required 
Number of moles required are - 19.26 mol of CO₂ 
3 0
3 years ago
PLEASE HELP ME ASAP THANK YOU!
fomenos

Answer:

The activation energy was reached was 10:45 a.m. The additional energy did not affect the reaction.

Explanation:

7 0
3 years ago
Read 2 more answers
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
4 years ago
6.02 X 10 to the 24th molecules of CuF is equal to how many moles of CuF?
oee [108]

Answer:

9.9 moles of CuF

Explanation:

Given data:

Number of molecules of CuF = 6.02×10²⁴

Number of moles of CuF = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

For CuF:

6.02×10²⁴ molecules× 1 mol / 6.022 × 10²³ molecules

0.99 ×10¹ mol

9.9 moles of CuF

5 0
3 years ago
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