The element from those four that is a noble gas is krypton.
Answer:
MgSo4 : 7H2O
Mr 120 : Mr 126
mass 80: x
then cross multiply
Explanation:
making x the subject of the formula then you will get 84 as the mass of water
The answers include:
- A loaf of risen but unbaked bread - chemical change.
- Photo by Elinor D - chemical change.
- Bread dough rising - chemical change.
<h3>What is a Chemical change?</h3>
This involves the formation of a new products from substances. In this scenario, a rising bread contains alcohol which evaporates.
Photographs also fall under this category and is therefore an irreversible chemical change.
Read more about Chemical change here
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Reactant + reactant = product
C + O2 = CO2
carbon dioxide is what's being made is product
Answer : The formula that represent hydrogen ions in an aqueous solution is, 
Explanation :
As we know that the formula of water is, 
.
In an aqueous solution, it dissociates to give hydrogen ion and hydroxide ion.
The dissociation reaction is:
The formula of hydrogen ion is,
The formula of hydroxide ion is, 
Hence, the formula that represent hydrogen ions in an aqueous solution is,
