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4 years ago

What is the chemical formula for sodium sulfate?

Chemistry

1 answer:

yan [13]4 years ago

5 0

Hello!

When finding the chemical formula of a compound, we will need to find the charges of each element/bond.

Looking at our period table, sodium has a +1 charge, written as Na 1+, and sulfate has a charge of -2, and it is written as SO4 2-.

Now, we need to make the charges equivalent. To do this, we need to "criss-cross" the charges. This means that sodium will need to additional atoms to make the charges equal, and sulfate will need one.

Therefore, the chemical formula for sodium sulfate is: Na2SO4.

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3 years ago

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All of the atoms of argon have the same?

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A 5.00 gram sample of an oxide of lead PbxOy contains 4.33 g of lead. Determine simplest formula for the compund

Harrizon [31]

Answer: The empirical formula is $PbO_2$

Explanation:

Mass of Pb = 4.33 g

Mass of O = (5.00-4.33) g = 0.67 g

Step 1 : convert given masses into moles

Moles of Pb = $\frac{\text{ given mass of Pb}}{\text{ molar mass of Pb}}= \frac{4.33g}{207g/mole}=0.021moles$

Moles of O = $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{0.67g}{16g/mole}=0.042moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For Pb = $\frac{0.021}{0.021}=1$

For O = $\frac{0.042}{0.021}=2$

The ratio of Pb O= 1: 2

Hence the empirical formula is $PbO_2$

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3 years ago

Consider this reaction mechanism:

marusya05 [52]

C. rate = k[C4H9Br]

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3 years ago

Properties volume to solid

Elan Coil [88]

4 States of Matter Properties - Solid, Liquid, Gas, Plasma

4 States of Matter Solid Liquid Gas Plasma
Volume/ Mass/
Density Definite Volume
Definite Mass
Definite Density Definite Volume
Definite Mass
Definite Density Changes volume
Definite mass
Changes density Changes volume
Definite mass
Changes density
Shape
Definite shape

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00000
00000

Changes shape

..000...
0000000

0 .......0...... 0
.....0
..............0 0 0

Changes shape

0.... ..0... 0
0 ..................0 0

.......0......
.....0
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Changes shape

0... ... 0
0 .............. 0

Relative position of atoms Fairly stationary
Locked in place
Tightly packed Not fixed, not locked
Free flowing
Loosely packed Relatively distant to other atoms Relatively distant to other atoms
Movement and collisions Vibrate in place Roll or slide over each other.
A few collisions Bounce and collide Fairly fast
Electrons stripped
Energy Low

Medium High Extremely high
Examples Rock Rock, paper, scissors Water, juice, tea Oxygen, hydrogen, water vapor Star, lightening, incandescent bulb
Compressibility force or pressure required High Little extreme pressure - stars - gravity, magnetic
Measured with Cubic meters... Liter, ml, qt. Gal. Cubic ...

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3 years ago