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Aneli [31]
3 years ago
11

A student believes she is observing a chemical reaction when pure sugar is burned and caramelizes. How can the student tell that

a chemical change has really occurred?
1. by comparing whether each is in the solid, liquid, or gas phase
2. by comparing their volumes
3. by comparing their masses
4. by comparing the solubility of each in water
Chemistry
1 answer:
svlad2 [7]3 years ago
7 0

Answer:

The solubility of a solute in a particular solvent is the maximum concentration that may be achieved under given conditions when the dissolution process is at equilibrium. Referring to the example of salt in water:

Explanation:

We will know that caramelizing sugar is a chemical change because it changes the sugar's color. A chemical change involves the forming of new substances from specific substances called reactants. Caramelizing sugar releases volatile chemicals that cause its caramel flavor.V = 4/3 πr^3

The melting points of crystalline solids cannot be categorized in as simple a fashion as boiling points. The distance between molecules in a crystal lattice is small and regular, with intermolecular forces serving to constrain the motion of the molecules more severely than in the liquid state.

(radius of sphere B)^3 / (radius of sphere A)^3

= 4^3 / 2^3

= 64/8

= 8

have a good Day T-T

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Anna11 [10]

Answer:

If you contact water with a gas at a certain temperature and (partial) pressure, the concentration of the gas in the water will reach an equilibrium ('saturation') according to Henry's law.

Explanation:

This means: if you increase the pressure (e.g. by keeping the vial closed), the CO2 concentration will increase. So it simply depends what concentration you need for your assay: 'CO2-saturated' water at low pressure or 'CO2-saturated' water at high pressure.

3 0
3 years ago
One crystalline form of silica (SiO2) has a cubic unit cell, and from X-ray diffraction data it is known that the cell edge leng
Sav [38]

Answer:

8 Silicon atom are present in unit cell.

16 oxygen atoms are present unit cell.

Explanation:

Number of atoms in unit cell = Z =?

Density of silica = tex]2.32 g/cm^3[/tex]

Edge length of cubic unit cell = a  = 0.700 nm = 0.700\times 10^{-7} cm

1 nm=10^{-7} cm

Molar mass of Silica  = 28.09 g/mol+16.00\times 2=60.09 g/mol

Formula used :  

\rho=\frac{Z\times M}{N_{A}\times a^{3}}

where,

\rho = density

Z = number of atom in unit cell

M = atomic mass

(N_{A}) = Avogadro's number  

a = edge length of unit cell

On substituting all the given values , we will get the value of 'a'.

2.32 g/cm3=\frac{Z\times 60.09 g/mol}{6.022\times 10^{23} mol^{-1}\times (0.700\times 10^{-7}cm)^{3}}

Z = 8

1 silicon is 2 oxygen atoms. then 8 silicon atoms will be 16 oxygen atoms.

5 0
4 years ago
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. it is often called the
Tema [17]

Water is often referred as a <span>universal solvent </span>because it is capable dissolving much more solutes as compared to any other solvent.  This is because, water is a high polar molecule. In water, H has partial positive charge while O has partial negative charge. 


Due to this, water favors dissociation of molecules into positively and negatively charged ions. Positively charge ions gets attracted  towards oxygen i.e. negatively charges, while negatively charged ions get attracted towards positive end of water molecule. 


However, it is worth nothing that, despite water being referred as universal solvent, many compounds are insoluble or partially soluble in water. For instance, most of the hydroxide displays poor solubility in water.

6 0
3 years ago
Read 2 more answers
The Avogadro constant is so large it is normally written in scientific notation. To get an idea of the enormity of the Avogadro
ch4aika [34]

Answer:

602214085700000000000000

Explanation:

The scientific notation form for the avogadro constant is given as;

6.022140857 × 10^23

The standard form with a lot of zeros is given as;

602214085700000000000000

4 0
3 years ago
The periodic table notation for nitrogen (N) is shown below. An atom of nitrogen has how many neutrons?
pashok25 [27]
The answer would be c because nitrogen has 14 as the atomic mass and 7 as the atomic number and you subtract the 14 minus 7
3 0
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