Sphalerite contains about 30% zinc. Calculate the maximum amount of zinc that could be obtained from 1000kg sphalerite.

Methanol and ethanol are said to be miscible in one another. What does this tell you?

sasho [114]

Answer:

That they are miscible in one another

4 0

3 years ago

Match the following aqueous solutions with the appropriate letter from the column on the right. Assume complete dissociation of

Serhud [2]

Answer: 0.17 m $CH_3COONH_4$ : Highest freezing point

0.20 m $CoSO_4$ : Second lowest freezing point

0.18 m $MnSO_4$ : Third lowest freezing point

0.42 m ethylene glycol: Lowest freezing point

Explanation:

Depression in freezing point is a colligative property which depend upon the amount of the solute.

$\Delta T_f=i\times k_f\times m$

where,

$\Delta T_f$ = change in freezing point

i= vant hoff factor

$k_f$ = freezing point constant

m = molality

a) 0.17 m $CH_3COONH_4$

For electrolytes undergoing complete dissociation, vant hoff factor is equal to the number of ions it produce. Thus i =2 for $CH_3COONH_4$ , thus total concentration will be 0.34 m

b) 0.18 m $MnSO_4$

For electrolytes undergoing complete dissociation, vant hoff factor is equal to the number of ions it produce. Thus i = 2 for $MnSO_4$ , thus total concentration will be 0.36 m

c) 0.20 m $CoSO_4$

For electrolytes undergoing complete dissociation, vant hoff factor is equal to the number of ions it produce. Thus i = 2 for $CoSO_4$ , thus total concentration will be 0.40 m

d) 0.42 m ethylene glycol

For non electrolytes undergoing no dissociation, vant hoff factor is equal to 1 . Thus i = 1 for ethylene glycol, thus concentration will be 0.42 m

The more is the concentration, the highest will be depression in freezing point and thus lowest will be freezing point.

4 0

3 years ago

Which color of light has the greatest energy

ozzi

Answer:

violet

Explanation:

Waves with a short wavelength have the most energy. Red waves have a relatively long wavelength (in the 700 nm range), and violet waves are much shorter - roughly half that. Because violet waves have the shortest wavelength of the visible light spectrum, they carry the most energy (google)

4 0

3 years ago

Which is a disadvantage of using chemical indicators? they are expensive to use. they measure ph directly. they must be selected

dexar [7]

Chemical indicators are the chemical reagents that show the change in reaction by changing color. Chemical indicators must be chosen with a narrow pH range.

<h3>What are indicators?</h3>

Indicators are the solutions or the substances used for the qualitative and the quantitative measurement by a change in color because of the absence or the presence of the sample concentration.

The chemical indicators cannot detect the exact pH and should be used with a narrow range of pH.

Therefore, option C. the narrow range of pH is the disadvantage of chemical indicators.

Learn more about chemical indicators here:

brainly.com/question/15114406

4 0

2 years ago

Which statement related to particle and wave properties of matter is correct? a. Interference patterns are observed when a wave

DerKrebs [107]

Answer:

a. Interference patterns are observed when a wave passes through a barrier with two slits

Explanation:

Interference is a situation where two waves superimpose to form a new wave of a different amplitude. This amplitude can be greater, same or lower.

the diagram attached below shows the movement of a wave through a barrier with two slits.

you can notice the portions of the wave that overlap. This overlapping of waves is the interference.

Thus, option A is correct.

The other options however, are not correct. as shown below:

Option B is wrong as waves exhibit diffraction <em>(it is diffraction of the light wave that produces the rainbows we see in the sky)</em>

Option C is wrong as waves do not travel straight through slits always.

Option D is wrong as waves can also interfere constructively and destructively.

7 0

4 years ago