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3 years ago

An unknown or changeable quantity is called a(n)...

Chemistry

2 answers:

Natali [406]3 years ago

7 0

<h2>Answer:</h2>

An unknown and changeable quantity is known as an variable.

<h3>Explanation:</h3>

There are two types of quantities:

Constant quantities:

Quantities which can not be changed by changing physical parameters and their value is normally known.

Variable quantities:

These quantities can be changed by changing the physical parameters or conditions. Due to which they are unknown for particular conditions and have to be measured.

givi [52]3 years ago

6 0

It is called a variable

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IceJOKER [234]

Answer:

*2Kl+Pb(NO3)2=PbI2+2KNO3: double replacement.

*2Al+3CuSO4=Al2(SO4)3+3Cu: single replacement.

*C2H5OH+3O2=2CO2+3H2O: combustion.

Explanation:

Hello there!

In this case, according to the required, it turns out necessary for us to recall the five types of reactions, combination, decomposition, single and double replacement and combustion as shown on the attached figure.

In such a way, since the first reaction follows the pattern AB+CD-->AD+CB we infer it is double replacement; the second reaction follows the patter A+BC-->AC+B and therefore it is single replacement; and the last one follows the pattern of combustion reaction due to the presence of CO2 and H2O on the products side.

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