Answer:
change of color
Explanation:
when a substance undergoes a change of color it is an indication that it was chemical
We have to look for safe and non - hazardous characterstics when trying to find new propellants.
<h3>What are propellants ?</h3>
Propellants are any gas, liquid, or solid the expansion of which can be used to impart motion to another substance or object.
The Desirable properties for propellant combinations are ;
- low molecular mass and high temperature of reaction products (for high exhaust velocity),
- high density (to minimize tank weight),
- low hazard factor (e.g., corrosivity and toxicity),
- low environmental impact,
- low cost.
Learn more about propellants here ;
brainly.com/question/1395855
#SPJ1
My main reason would be momentum – it depends on the mass as
well as the speed of the colliding objects. For example if two sedans
travelling in a low speed bump each other, then probably the damage would be
minimal scratches. However, if a high speed car crashes unto a heavy truck also
travelling fast, then the result would be catastrophic.
Most of metallic elements prefer being oxidized. At this form, they are most stable. In the case of aluminum metal, its stable form is aluminum oxide. Aluminum ion has +3 charge while an oxygen ion has -2 charge. By cross interaction, it will form Al2O3.
The mixture of phenol and benzoic acid is separated by adding 
to produce brisk effervescence with sodium benzoate .
When benzoic acid react with then sodium benzoate is produced which is soluble in water and separated from non aqueous solvent . Organic compounds are soluble in organic solvent and inorganic compound mainly soluble in inorganic solvent like water.
What is brisk effervescence?
Brisk effervescence is when continuous gas evolution occurs in a chemical reaction like CO2. When HCl is added in then CO2 evolved.
Read more about brisk effervescence:
brainly.com/question/16994956
#SPJ4
