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Gala2k [10]
3 years ago
12

BRAINLIESTT ASAP! PLEASE HELP ME :)

Chemistry
1 answer:
ruslelena [56]3 years ago
7 0

Answer:

See below  

Step-by-step explanation:

Matter is either a <em>pure substance</em> or a <em>mixture. </em>

Pure substances

  • Are composed of one type of atom or molecule.
  • Have a constant chemical composition
  • Have fixed chemical properties
  • Have fixed physical properties

              • For example, melting point, boiling point, density, solubility

Mixtures:

  • Consist of two or more substances not chemically combined
  • Have a variable composition
  • Can be separated into two or more components by physical means

             • For example, filtration, distillation, centrifugation

  • Each component retains its own properties
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Answer:

Gas X

Explanation:

The given reaction can be written in the form of chemical equation as shown below as:

X+2Y\rightarrow 2XY_2

According to law of conservation of mass, the moles of each substance in the reaction must be equal on both reactant and product side.

Also, the question asks for the gas which is diatomic. XY_2 cannot be diatomic as the formula contains 3 atoms.

Between gas X and gas Y , <u>X has to be diatomic for the reaction to balance </u>as:

X_2+2Y\rightarrow 2XY_2

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3 years ago
Which is an example of a polymer?
g100num [7]

Answer:

diamond

Explanation:

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2 years ago
A solution of NaOH has a concentration of 25.00% by mass. What mass of NaOH is present in 0.250 g of this solution? Use the peri
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m_{NaOH}=25.00\%\times m_{solution}\Longrightarrow m_{NaOH}=\dfrac{25}{100}\times 0.250~g\iff\\\\\boxed{m_{NaOH}=0.0625~g}
7 0
3 years ago
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Which mineral can be found in the rocks phyllite, sandstone, and granite?
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Assume you have 4 solids (A, B, C and D) of similar mass. Which of these requires the greatest energy input to melt?
bazaltina [42]

The solid that require the greatest energy input to melt by mass is the option;

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Solution Explanation

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Polar covalent molecular solids have the following characteristics;

a) Soluble in water b) Low melting point, b) Conduct electricity

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Solids of ionic compounds have the following characteristics;

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