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crimeas [40]
3 years ago
8

How can you tell if a chemical reaction has occurred?

Chemistry
1 answer:
qwelly [4]3 years ago
7 0
Gas formation, precipitate formation, color change, temperature change, or odor 
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Which of the following is an example of a decomposition reaction?
Flura [38]

Answer:

A simple example of decomposition reaction is hydrolysis of water where a water molecule is broken down into hydrogen and oxygen gas.

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2 years ago
In which state do molecules have the highest kinetic energy? in the liquid state in the solid state in the gaseous state during
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It depends on the substance,but for most substance it is in the gaseous state.
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3 years ago
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Calculate the number of liters in 3.25 g of ammonia
il63 [147K]

 The liters in   3.25 g   of  ammonia  4.28 L


  <u><em>calculation</em></u>

 Step 1: find moles of ammonia

 moles = mass÷ molar  mass

 From  periodic    table  the molar mass  of ammonia (NH₃)  =  14 +(1×3 ) = 17  g/mol

3.25 g÷ 17 g/mol = 0.191   moles

Step 2: find the number of liters of ammonia

 that is at STP  1  moles = 22.4 L

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<em>by cross  multiplication</em>

 ={( 0.191   moles  ×22.4 L) / 1 mole}  = 4.28 L



8 0
3 years ago
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Which changes occur when Pt2+ is reduced?
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The correct answer is option 2. When Pt2+ is reduced it loses electrons, oxidizing it. The oxidation number is the charge of the atom. Adding an electron, decreases the net charge consequently the oxidation number.
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Which atom tends to gain 1 electron when it combines with another atom?
swat32
Any of the Halogens (second to last vertical column going down)
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