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olga nikolaevna [1]
4 years ago
8

A centrifuge was used to separate a sample into its components. What conclusion about the sample can be formed based on the tech

nique used? It was a pure substance. It was a compound. It was a heterogeneous mixture. It was a homogeneous mixture
Chemistry
2 answers:
Komok [63]4 years ago
8 0

Its Homogenous Centrifuges are used to speed up the process of separating Homogeneous mixtures.

tatiyna4 years ago
3 0

Answer is: It was a homogeneous mixture.

For example, a centrifuge is used to separate components from blood.

This technique is also used for heterogeneous mixtures.

Centrifugation is a technique using centrifugal force to separate particles from a mixture according to their size, shape and density.

The principle is that the denser particles are forced to the bottom and the lighter particles stay at the top.

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Why are fossils found mainly in sedimentary rock? choose all that apply
jeka94

<em>"Sedimentary rocks are formed by the pressure over millions of years of organic material, inorganic material, sediment of course , and earth piling up over itself. Metamorphic rock and igneous rock originate either below the surface where plants lived and creatures roamed, or the heat from volcanic activity transformed everything. Sedimentary rock formation is the only geologic activity that permits and allows organic material preservation and hence fossil formation." </em>- <u>Charles Snider, Co-Founder of American Geode (on Quora.com)</u>

3 0
3 years ago
Determine the enthalpy for the reaction A+B --&gt; C If we know the following:
PolarNik [594]

Explanation:

here is the answer to the question

7 0
3 years ago
A 0.875-g sample of anthracite coal was burned in a bomb calorimeter. The temperature rose from 22.50 to 23.80°C. The heat capac
kherson [118]

Answer:

a) 26.65 kJ was the heat evolved by the reaction.

b) 3.046\times 10^7 kJ is the energy released on burning 1 metric ton  of this type of coal

Explanation:

Heat capacity of the calorimeter = C = 20.5 kJ/°C

Initial temperature of the calorimeter,T_1 = 22.50°C

Final temperature of the calorimeter,T_2 = 23.80°C

The heat evolved by the reaction = Q

Q=C(T_2-T_1)

Q=20.5 kJ/^oC\times (23.80^oC-22.50^oC)

Q=26.65 kJ

26.65 kJ was the heat evolved by the reaction.

0.875 g sample of anthracite coal was burned in a bomb calorimeter

0.875 g sample of anthracite coal gives 26.65 kJ of heat.

1 metric ton= 1000 kg

1000 kg = 1000 × 1000 g = 1,000,000 (1 kg =1000 g)

Then burning 1,000,000 g coal will give:

=\frac{26.65 kJ }{0.875}\times 1,000,000 g=3.046\times 10^7 kJ

3.046\times 10^7 kJ is the energy released on burning 1 metric ton  of this type of coal

8 0
3 years ago
Iodine pentafluoride gas reacts with iodine fluoride gas producing iodine heptafluoride gas and iodine gas. What is the maximum
dybincka [34]

Answer:

63.45g of I₂ can be produced

Explanation:

IF₅ reacts with IF to produce IF₇ and I₂. The reaction is:

IF₅ + 2 IF → IF₇ + I₂

Moles of 10.0g of IF₅ (221.89g/mol):

10.0g IF₅ × (1mol / 221.89g) = <em>0.0451 moles of IF₅</em>

Using PV / RT = n, it is possible to find moles of 11.20L of IF, thus:

1atm×11.20L / 0.082atmL/molK × 273K = 0.500 moles of IF.

<em>At STP, pressure is 1atm, temperature is 273K and gas constant R is 0.082atmL/molK</em>

For a complete reaction of IF₅ you need:

0.0451 moles of IF₅ × (2 moles IF / 1 mole IF₅) = 0.902 moles of IF. As you have just 0.500 moles of IF, the IF is the limiting reactant.

2 moles of IF produce 1 mole of I₂. 0.500 moles of IF produce:

0.500mol IF ₓ ( 1 mol I₂ / 2 mol IF) = 0.250 mol I₂

As molar mass of I₂ is 253.81g/mol, mass of 0.250 mol I₂ are:

0.250mol I₂ ₓ (253.81g / mol) =

<h3>63.45g of I₂ can be produced</h3>
3 0
4 years ago
All of the elemnts in groups of 17 of the modern periodic table are classfied as
viktelen [127]

Answer:

Halogens

Explanation:

All the elements in Group 17 on the periodic table are classified as halogens. The members of this group are:

  • Fluorine
  • Chlorine
  • Bromine
  • Iodine
  • Astatine

They are also known as the group VIIA

Their general outer energy level structure is ns² np⁵

  • The first four members of the group are common. Fluorine is the most reactive non-metal and iodine is less reactive.
  • Due to lack of one electron to complete their outermost shell, they are good oxidizing agents and are univalent.

3 0
4 years ago
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