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2 years ago

An example of a pure substance is ____.

Chemistry

1 answer:

Vsevolod [243]2 years ago

6 0

Answer: e) all of these

Explanation:

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Copper

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water $(H_2O)$ , carbon dioxide $(CO_2)$

Mixtures are not pure substances as they consist of elements and compounds combined physically and not in any fixed ratio. Example: Air

Thus all given substances are pure substances.

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What is the volume of 1.4 mol of nitrogen gas at STP?

zaharov [31]

Answer:

31.36 Liters

Explanation:

1 mole is equal to 22.4 liters at STP so you can use the equation

1.4 moles * 22.4 liters

to find the volume.

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3 years ago

All organic molecules have what element in common

joja [24]

Every organic molecules/compound contains carbon (c).

Some other very abundant are hydrogen, nitrogen, oxygen, phosphorus, and sulfur.

I learned this with the acronym CHNOPS.

C - Carbon

H - Hydrogen

N - Nitrogen

O - Oxygen

P - Phosphorus

S - Sulfur

Hope this helps!

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3 years ago

Read 2 more answers

Water’s chemical formula is . One atom of bonded to two atoms of . The hydrogen atoms are to one side of the oxygen atom, result

xxTIMURxx [149]

Water’s chemical formula is H2O
One atom of oxygen bonded to two attached atoms of hydrogen.
The hydrogen atoms are to one side of the oxygen atom, resulting in a water molecule having a positive charge on the side where the hydrogens reside and a negative charge on the other side, where the oxygen atom resides. This separation
of charge on opposite ends of the molecule is called polarity

I hope this right and can help you!

7 0

2 years ago

Which reaction type is the following: AgF + CaCl2 --> AgCl + CaF2

nevsk [136]

Explanation:

${\small{\underline{\bf{\red{answer...}}}}} \\ \\$

$\small\mathfrak\purple{Double \: displacement \: reaction} \\ \\ \small\mathfrak\orange{hope \: it \: helps...}$

6 0

2 years ago

At 333 k, which of the pairs of gases below would have the most nearly identical rates of effusion?

rjkz [21]

E. co and n2Effusion is the process where gas escapes through a hole. Gases with a lower molecular mass effuse more speedy than gases with a higher molecular mass. Relative rates of effusion is related to the molecular mass.
a) M(N₂)/M(O₂) = 28/32 = 0,875
b) M(N₂O)/M(NO₂) = 44/46 = 0,956
c) M(CO)/M(CO₂) = 28/44 = 0,636
d) M(NO₂)/M(N₂O₂) = 44/58= 0,758
e) M(CO)/M(N₂) = 28/28 = 1, CO and N₂ have iexact molecular masses and will effuse at nearly identical rates.

8 0

3 years ago