3 years ago

Please explain the relationship between the terms: Element, atom, molecule, and compound.

Chemistry

1 answer:

umka2103 [35]3 years ago

4 0

An element is made up of an atom, a molecule is a bunch of elements, and a comping is a bunch of molecules

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A crystallographer measures the horizontal spacing between molecules in a crystal. The spacing is

Brilliant_brown [7]

But what is the width of the molecule

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3 years ago

If 45.0 mL of ethanol (density =0.789g/mol) initially at 6.0°C mix with 45.0 mL of water (density =1.0 g/mol) initially at 28.0°

Likurg_2 [28]

The final temperature of the mixture : 21.1° C

<h3>Further explanation </h3>

The law of conservation of energy can be applied to heat changes, i.e. the heat received / absorbed is the same as the heat released

Q in(gained) = Q out(lost)

Heat can be calculated using the formula:

Q = mc∆T

Q = heat, J

m = mass, g

c = specific heat, joules / g ° C

∆T = temperature difference, ° C / K

Q ethanol=Q water

mass ethanol=

$\tt mass=\rho\times V\\\\mass=0.789\times 45=35.505~g$

mass water =

$\tt mass=1~g/ml\times 45~ml=45~g$

then the heat transfer :

$\tt 35.505\times 2.42~J/g^oC\times (t-6)=45\times 4.18~J/g^oC\times (28-t)\\\\85.922t-515.533=5266.8-188.1t\\\\274.022t=5782.33\rightarrow t=21.1^oC$

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3 years ago

Which elements are considered metals? Non-metals? Metalloids?

kolbaska11 [484]

The answer is in the photo.

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3 years ago

Pl help me, i need a good grade on this.

Blizzard [7]

1. Option A. Temperature and Salinity
2. Option D. (I think)
3. Option D.
Hope your test goes well!

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3 years ago

Why did mendeleev leave blank spaces in his version of the periodic table?.

Leviafan [203]

<h2>Answer: He left blank spaces for <em>undiscovered</em> elements to be added to the table.</h2>

Explanation:

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2 years ago

Read 2 more answers