Ents 5. Sodium hydrogen carbonate, NaHCO,, can be converted into sodium carbonate,
Na Coz, by heating. This is a thermal decomposition reaction in which carbon
dioxide and water vapour are also produced. A student started with 10g of
sodium hydrogen carbonate and collected 5.4g of sodium carbonate.
Calculate the percentage yield the student obtained.

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

sure im new too!

explanation: