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3 years ago

For which of the following can the composition vary?

Chemistry

2 answers:

Mice21 [21]3 years ago

6 0

Answer:

Option a. both homogeneous and heterogeneous mixture.

Explanation:

This can be explained as a mixture is the combination of more than one substances mixed together while retaining their identities or chemical properties.

Homogeneous mixtures in which the components are mixed in the same amounts or proportion, i.e., it has uniformity in it.

Heterogeneous mixtures in which the constituents are not mixed in uniform proportion and are separable.
Pure elements are those which have the a stable isotope or the atomic number of which are same.
Thus the composition can only vary in homogeneous and heterogeneous mixtures.

Margarita [4]3 years ago

5 0

Answer: Option (a) is the correct answer.

Explanation:

A homogeneous mixture is defined as a mixture that contains evenly distributed solute particles into the solvent.

For example, NaCl dissolved in water is a homogeneous solution.

On the other hand, a solution in which solute particles are not evenly distributed into the solvent is known as a heterogeneous mixture.

For example, when sand is added to water then it forms a heterogeneous solution.

Thus, we can conclude that for both homogeneous and heterogeneous mixtures the composition vary.

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You make some iced tea by dropping 325 grams of ice into 500.0 mL of warm tea in an insulated pitcher. If the tea is initially a

lora16 [44]

Explanation:

The given data is as follows.

Mass of ice dropped = 325 g

Initial temperature = $30^{o}C$ = (30 + 273) K = 303 K

Final temperature = $0.0^{o}C$ = (0 + 273) K = 273 K

Now, using density of water calculate the mass of ice as follows.

$m_{ice} = \frac{500 ml \times 1.0 g/mol}{1 ml}$

= 500 g

As the relation between heat energy, specific heat and change in temperature is as follows.

Q = $m \times C_{p} \times dT$

= $\frac{500 g}{18 g/mol} \times 75.3 J/K/mol \times (303 - 273)K$

= 62750 J

Also, relation between heat energy and latent heat of fusion is as follows.

Q = m L

= $\frac{325 g}{18 g/mol} \times 6 \times 10^{3}$

= 108300 J

Therefore, we require $\frac{325 g}{18 g/mol} J$ heat but we have 40774.95 J.

So, $mass_{ice} = \frac{m \times C_{p} \times (T_{f} - T_{i})}{\Delta H_{f}}$

= $\frac{62750 J}{333}$

= 188.4 g

Hence, the mass of ice = 325 g - 188.4 g

= 137 g

Therefore, we can conclude that 137 g of ice will still be present when the contents of the pitcher reach a final temperature.

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3 years ago

What type of change is baking a cake?

gladu [14]

Chemical reactions occur when baking a cake, there fore cake baking is a chemical change. Generally, if a change is chemical, the thing or things that have been changed cannot be reverted back to their original state e.g. you cannot separate the ingredients of a cake after it has been baked.

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3 years ago

when applied to a dish, soap makes grease soluble in water. which explanation correctly supports the role of intermolecular forc

ankoles [38]

This is possible because of the emulsifying properties present in soap. This property is caused by the hydrophilic end and hydrophobic end of a soap molecule. Grease is able to be dissolved in the water because it is attracted to the hydrophobic end of the soap molecule.

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The anion formed from an oxygen atom is called a(n)

marta [7]

A. Oxygen ion
I am not sure but that's the right one I think. If I am wrong then I am sorry

6 0

4 years ago

Molar mass of 34.00 g/mol molecular formula

alukav5142 [94]

Multiplying the subscripts within the empirical formula by this number gives you the molecular formula H2O2.

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