I’m pretty sure it’s d, please let me know !
1.) Which of the following is a molecule but not a compound?
A.He
"He" or helium is an initial for a single element and a compound has more than one element.
2.) What is a physical combination of substances?
A.a mixture
When two substances are combined they result in a compound.
3.) What is a chemical combination of substances?
A. they form a compound
When two chemical elements are combined they form a compound.
4.) What is the relationship between the solute and solvent in a solution?
B.they form a mixture
Solutes are dissolved into the solvent which results in a mixture.
Answer:
The temporary hardness of water can be removed by boiling. The bicarbonates get converted to insoluble carbonates and settle down at the bottom.
Calcium bicarbonate -------> Calcium carbonate [insoluble] + Water + Carbon dioxide.
Ca[HCO3]2 -----> Ca CO3 + H2O + CO2
The classifying of organisms is called "Taxonomy" or the second option. Taxonomy mainly takes place with organisms although it could be used to classify anything. Taxonomy consists of a graph with eight categories all used to classify a living organism.
Hope this helps!
