Which process is an example of a chemical change?

Chemistry

2 answers:

love history [14]3 years ago

7 0

Answer: A metal railing rusting in damp weather.

Explanation:

A chemical change is one in which a new substance is formed during the process of this change and it's not reversible.

A metal railing rusting in damp weather is an example of a chemical change because a new substance called Rust (Fe2O3) you is formed when iron reacts chemically with air.

Yuliya22 [10]3 years ago

4 0

<span>Chemical Energy is energy stored in the bonds of chemical compounds (atoms and molecules). It is released in a chemical reaction, often producing heat as a by-product (exothermic reaction). Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy.

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2. Balance the equation below, and answer the following question: What volume of chlorine gas, measured at STP, is needed to com

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first, we have to convert grams to molecules using the molar mass, and then use mole to mole ratio from the balanced equation.

molar mass of Na= 23.0 g/mol
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Answer:- Third choice is correct, 17.6 moles

Solution:- The given balanced equation is:

Al_2(SO_4)_3+6KOH\rightarrow 2Al(OH)_3+3K_2SO_4

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From the balanced equation, there is 1:6 mol ratio between aluminium sulfate and potassium hydroxide.

It is a simple mole to mole conversion problem. We solve it using dimensional set up as:

2.94molAl_2(SO_4)_3(\frac{6molKOH}{1molAl_2(SO_4)_3})

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