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3 years ago

Which of the following substances has

2 answers:

4 0

D. all of the above, although I do find it hard to believe something like flour would have a melting point, I looked up my answer to double check.

alina1380 [7]3 years ago

3 0

Answer:

D all of the above

Explanation:

Melting point represents the exact temperature at which the solid state changes to the liquid of a given substance. Water is one of the most commonly used elements to exemplify the melting point principle. For this solid state (ice) to take the form of liquid water, it must be exposed to a temperature of at least 0 °C. Thus, the melting point of water is equal to 0 °C.

The salt has a melting point of 801 ° C, the melting point of sugar is 185 ° C and the melting point of flour is 264 ° C. From this we can see that all these products have a higher melting point than water.

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You need to determine the specific gravity of a sample. After putting the sample on a lab scale, you know it has a mass of 85 gr

BlackZzzverrR [31]

Answer:

Specific gravity of the sample = 8.947

Explanation:

Specific gravity of a substance is defined as the density of that substance divided by the density of water.

Density of water = 1000g/l

Density of substance = mass/volume

= 85/9.5 x 10^-3

= 8947.37 g/l

SG = 8947.37/1000

= 8.947

3 0

3 years ago

Alum is a compound used in a variety of applications including cosmetics, water purification, and as a food additive. It can be

vlabodo [156]

Answer:

The theoretical yield of alum is 19.873 grams and percent yield for this alum synthesis is 45.33%.

Explanation:

Mass of bottle = 10.221 g

Mass of bottle with aluminium pieces = 11.353 g

Mass of aluminium = 11.353 g - 10.221 g = 1.132 g

Mass of alum and bottle = 19.230 g

Mass of alum = 19.230 g - 10.221 g = 9.009 g

Experimental yield of alum = 9.009 g

Theoretical yield of alum:

$2Al(s) +2 KOH(aq) +4H_2SO_4(aq)+10 H_2O(l) \rightarrow 2 KAl(SO_4)_2.12 H_2O(s)+3H_2(g)$

Moles of aluminium = $\frac{1.132 g}{27 g/mol}=0.041926 mol$

According to reaction, 2 moles of aluminum gives 2 moles of alum.

Then 0.041926 mol aluminium will give :

$\frac{2}{2}\times 0.041926 mol=0.041926 mol$ of alum.

Mass of 0.041926 moles of alum:

0.041926 mol × 474 g/mol= 19.873 g

Theoretical yield of alum = 19.873 g

Percentage yield:

$\% Yield =\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100$

Percentage yield of the alum:

$\% Yield =\frac{ 9.009 g}{19.873 g}\times 100=45.33\%$

The theoretical yield of alum is 19.873 grams and percent yield for this alum synthesis is 45.33%.

7 0

3 years ago

What are the four body systems that are involved of getting oxygen in our cells ?

Alex17521 [72]

Answer: The cells that make up the digestive, muscular, skeletal, reproductive, and excretory systems all need oxygen from the respiratory system to function, and the cells of the respiratory system—as well as all the other systems—need nutrients and must get rid of metabolic wastes.

Explanation:

8 0

3 years ago

Which common material is an example of a polyamide?

Vlad1618 [11]

Nylon 6,6 is a common example of a polyamide.

Polyamides are polymers that contain repeating amide (-CO-NH-) linkages.

The structure of Nylon 6,6 is

[-NH-(CH_2)_6-NH-CO-(CH_2)_4-CO-]_n

where n is a large number.

The numbers in the name showow that there are six carbon atoms on either side of an amide linkage.

5 0

3 years ago

Clary ran 20 miles in four hours. What was her average speed?

Nady [450]

5 miles per hour

20/4=5

4 0

3 years ago

Read 2 more answers