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AURORKA [14]
1 year ago
9

A first-order reaction has a half-life of 20.0 minutes. Starting with 1.00 x 10^20 molecules

Chemistry
1 answer:
blsea [12.9K]1 year ago
7 0

Answer:

E

Explanation:

100 minutes is   5 half lives  ( 100 min/20 min/half life)

         = (1/2 )^5

1 x 10^20    *    (1/2)^5 =   3.125 x10^18   molecules

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Find the grams in 1.26 x 10^-4 mole of HC2 H3O2
ivolga24 [154]
Molar mass :

HC₂H₃O₂ = 1 + 12*2 + 1 * 3 + 16 * 2 = 60 g/mol

1 mole <span>HC₂H₃O₂ -------------- 60 g
</span>1.26x10-⁴ mole ----------------- mass

mass =  1.26x10-⁴ * 60

mass = 0.00756 g of <span>HC₂H₃O₂</span>

hope this helps!


7 0
3 years ago
Does percent error measure accuracy or precision?
Nesterboy [21]

Answer:

Precision

Explanation:

It figures out how close all of the data numbers are.

4 0
3 years ago
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Which six elements are generally considered metalloids
chubhunter [2.5K]

Answer:

boron, silicon, germanium, arsenic, antimony, and tellurium

4 0
3 years ago
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Why does cesium have a positive 1 charge​
Sidana [21]

Answer:

1+1=5

Explanation:

5

4 0
3 years ago
Completion
Snowcat [4.5K]

Answer:

  1. Compress
  2. Fixed
  3. Melts
  4. Melting Point
  5. Freezing Point
  6. High
  7. Crystalline
  8. Lattice
  9. Unit cell
  10. Amorphous solids

Explanation:

Solids tend to be dense and difficult to <u>compress.</u>

They do not  flow or take the shape of their containers, like liquids do, because  the particles in solids vibrate around <u>fixed</u> points.

When a solid  is heated until its particles vibrate so rapidly that they are no longer  held in fixed positions, the solid <u>melts</u>.  

<u>Melting point</u> is the  temperature at which a solid changes to a liquid. The melting and <u>freezing point</u>  of a substance are at the same temperature.

In general,  ionic solids tend to have relatively <u>high</u>  melting points, while  molecular solids tend to have relatively low melting points.

Most  solids are <u>crystalline</u>

The particles are arranged in a pattern known  as a crystal <u>lattice</u>

The smallest subunit of a crystal lattice is the <u>unit cell</u>  

Some solids lack an ordered internal structure   and are called <u>amorphous solids.</u>

7 0
3 years ago
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