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3 years ago

A sample of water has a volume of 24.0 millimeters and a mass of 23.8 grams. what is the density

Chemistry

1 answer:

victus00 [196]3 years ago

3 0

24.0mm^3=24÷10÷10÷10cm^3
density=Mass÷Volume

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Consider a piece of gold jewelry that weighs 9.85 g and has a volume of 0.675 cm3 . The jewelry contains only gold and silver, w

AlekseyPX

Answer:

61.5096 %

Explanation:

Let the amount of gold in the jewelry = x g

Let the amount of silver in the jewelry = y g

Total mass of jewelry = 9.85 g

So,

x + y = 9.85 g .................................1

Density = Mass / Volume

Given that:

Density of gold = 19.3 g/cm³

Thus, volume is:

Volume = Mass / Density = x / 19..3 cm³

Given that:

Density of silver = 10.5 g/cm³

Thus, volume is:

Volume = Mass / Density = y / 10.5 cm³

The total volume of the jewelry = 0.675 cm³

So,

$\frac {x}{19.3}+\frac {y}{10.5}=0.675$

Or,

10.5 x + 19.3 y = 136.78875 ................2

Solving 1 and 2, we get that:

x = 6.0587 g

y = 3.7913 g

So, mass % of gold:

Mass % = (6.0587 / 9.85)×100 = 61.5096 %

7 0

3 years ago

Different ____ of an element have different numbers of neutrons

goldenfox [79]

Answer:

different elements have different numbers of neutrons.

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4 years ago

Which example best shows conservation of resources?

Inessa05 [86]

Answer:

Recycling aluminum cans and glass bottles

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3 years ago

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The element lead (pb) consists of four naturally occurring isotopes with atomic masses 203.97302,205.97444,206.97587, n 207.9766

Marina CMI [18]

The method of determining the most common isotope of lead is by determining the average atomic mass. The formula for determining the average atomic mass is:

$average atomic mass = \Sigma {percent abundance}\times {atomic mass}$

Substituting the values in the formula:

$average atomic mass = \frac{{203.97302}\times {1.4}+{205.9744}\times {24.1}+{206.97587}\times {22.1}+{207.97663}\times {52.4}}{100}$

$average atomic mass = \frac{285.562228+4963.984004+4574.166727+10897.975412}{100}$

$average atomic mass = \frac{20721.688371}{100} = 207.22 amu$

The most common isotope of lead is:

Lead - 207.22 amu

The atomic symbol of lead is $Pb$ . The atomic number of $Pb$ is 82.

So, the the most common isotope of lead can be written as:

$_{207.22}^{82}Pb$ and Lead - 207.22 amu.

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3 years ago

You get a can of soda from the vending machine and your “friend” maliciously shakes it when you’re not looking. You open the can

vaieri [72.5K]

Physical Change because a new substance was not created and if it was a chemical change, a new substance would have to be created.

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4 years ago

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