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meriva
3 years ago
7

Which statement below BEST describes the difference between mixtures and pure substances? Group of answer choices Mixtures are m

ade of a single kind of matter but a pure substance is two or more substances that are chemically bonded. Pure substances can be physically separated but mixtures cannot be physically separated. Pure substances are not created through a chemical reaction and mixtures are the result of a chemical reaction. Mixtures can be physically separated but pure substances cannot be physically separated.
Chemistry
1 answer:
lianna [129]3 years ago
6 0

Answer:  <u>Mixtures can be physically separated but pure substances cannot be physically separated.</u>

Explanation: Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography. A pure substance, any compound or element, can't be separated into different atoms by physical methods. Pure substances are compounds and elements (made up of the same atom or same molecule respectively), while mixtures are an assortment of different substances put together. Hope this helps ^-^.

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Given the following equation: 8 Fe + S 8  8 FeS
sleet_krkn [62]

Answer:

Explanation:

so u can work out the amount of moles of S8 by using

moles=mass/mr

=16/32.1=0.498moles

then use the molar ratio of

S : Fe

1:1 so the moles of Fe is the same 0.498

The use the equation

mass = mr x moles

=55.8 x 0.498

=27.78

so 27.8 g

hope this make sense :)

8 0
3 years ago
Convert a volume of 3.5 m3 to cubic centimeters.
Xelga [282]

Answer:

3.5 cubic centimeters

Explanation:

1 mL is equal to 1 cubic centimeter.

If you had one small counting cube that was worth 1 and you melted it down you would get a cubic centimeter.

7 0
4 years ago
(b) What property do all elements in the same column of the Periodic Table as
Shalnov [3]
Well the group fluorine is in is known as Halogens. Halogens all have seven valence electrons in their outer shell. They exist as diatomic molecules. Furthermore they readily combine with metals to form salts
7 0
3 years ago
Read 2 more answers
Calculate the mass of NaCl needed to make 40% solution from 3kg of water ? Could you explain step by step please :-)
earnstyle [38]
Ok so 40 percent of 3000 grams which is 3 kg is 1200 grams 
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3 0
3 years ago
The current scientific verdict on the phlogiston theory demonstrates which two of the following principles?
masha68 [24]

Answer:

The two valid principles are:

  • Scientific theories can be replaced by better theories.
  • An experiment can disprove a theory that scientists have accepted.

Explanation:

The scientific knwoledge is not inmutable; it may (and does) change with new discoveries.

In fact, scientific theories cannot be proved right, instead they are constantly tested to try to  disprove them. This is what the principle that theories are falsiable means.

As long as a scientific theory is not disproved it remains valid, but new discoveries may lead, eventually, to its disprovement.

Scientific knowledge evolves because new procedures, new technologies, and new evidence leads to a better understanding and better explanations.

5 0
3 years ago
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