Answer:
2 and 4 if its more than one answerd and if not 2
Explanation:
brainleist would be nice
Answer:the answer is b
Explanation:I took the test and got it right
Answer: 
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here iron is having an oxidation state of +3 called as
cation and oxide
is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral
.
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

<span>'Do all liquids evaporate at the same rate
that would be false
</span>
The enzyme must attract substrates to its active state.
At the end of the reaction, products dissociate from the surface of the enzyme