A(n) _____ is a natural object that orbits another object in the solar system besides the Sun.

Chemistry

1 answer:

Stolb23 [73]3 years ago

4 0

The answer is the moon

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if the percent by volume is 2% and the volume of solution is 250 mL what is the volume of solute and solution

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Answer:

Solute = 5 mL; solution = 250 mL

Explanation:

The formula for percent by volume is

$\text{Percent by volume} = \dfrac{\text{Volume of solute}}{\text{Volume of solution}}\times 100 \, \%$

If you have 250 mL of a solution that is 2 % v/v,

$\begin{array}{rcl}2 \, \% & = & \dfrac{\text{Volume of solute}}{\text{250 mL}}\times 100 \, \%\\\\2 \times \text{ 250 mL} & = & \text{Volume of solute} \times 100\\\text{Volume of solute} & = & \dfrac{2 \times 250\text{ mL}}{100}\\\\ & = & \textbf{5 mL}\\\end{array}$

If there is no change of volume on mixing,

Volume of solution = 250 mL

-Volume of solute = 5

Volume of solvent = 245 mL

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Ethyne (C2 H2 (g), Hf = 226.77 kJ/mol) undergoes complete combustion in the presence of oxygen to produce carbon dioxide

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C₂H₂ + O₂ --> CO₂ + H₂O

when balanced

2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

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Write the formula for the polyatomic ion in KOH. Express as an ion..

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KOH is a compound containing two ions, K+ and OH-.
The polyatomic ion present is OH- which is called hydroxide. 
The compound is named potassium hydroxide.

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Comare and contrast physical property and chemical property

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A physical property is a quality or condition of a substance that can be observed or measured without changing the substance's composition. a chemical property is the ability of a substance to undergo a specific chemical change.

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Name the following alkyne:

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There isn't any picture for me to see

have a good day :)

Explanation:

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