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2 years ago

Pls help with these question because I don't understand what are pure substance and how to tell

Chemistry

2 answers:

Papessa [141]2 years ago

5 0

Answer:

i am pretty sure its A

Explanation:

they are etheir together like black and white or some sort of pattern if notice.

If they are like B,C,D like that they are mixtures which are NOT PURE SUBSTANCE'S.

Romashka [77]2 years ago

5 0

Answer:

option A is your answer.

Explanation:

Reason being is because that for the diagram if all of the little dots are connected another single dot then it is a pure but if one little dot isn't connected to another one then it isn't a pure substance.

Hope this helps!!!

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The diagram below shows the Moon at four positions in its orbit around Earth

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Answer:

They all react with acids.

Explanation:

Thus, they decrease the concentration of stomach acid and provide heartburn relief.

The equations for the reactions are:

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3 years ago

The term “ sea of electrons “ refers to

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Answer:

Explanation:

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3 years ago

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2 years ago

Lactic acid, C3H6O3, is a monoprotic acid that is available in solid form. Determine the concentration of an unknown solution of

Andreas93 [3]

Answer:

0.497 moles/L

Explanation:

The reaction that takes place is:

C₃H₆O₃ + NaOH → C₃H₅ONa + H₂O

First we c<u>alculate the moles of lactic acid in 0,821 g</u>, using its molar mass:

0,821 g ÷ 90 g/mol = 9,122x10⁻³mol lactic acid

<em>One mole of lactic acid reacts with one mole of sodium hydroxide</em> (it is a monoprotic acid), so in 18,34 mL of NaOH solution there are 9,122x10⁻³moles of NaOH:

18.34 mL ÷ 1000 = 0,01834 L

9,122x10⁻³mol ÷ 0,01834 L = 0.497 moles/L

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3 years ago

Pls help with these question because I don't understand what are pure substance and how to tell ​

Pls help with these question because I don't understand what are pure substance and how to tell