Answer:
0.1 mol
Explanation:
Number of mole= mass/molar mass
lithium have a mass number of 7 and oxygen have a mass number of 16.
so, (7x2) + 16
= 30
therefore, number of moles = 2.93/30
= 0.10
Answer:
If this is that MC question then the answer is D.
Explanation:
The correct answer is D. The energy needed for a chemical reaction is called the activation energy. This energy is to be present in order for the reaction to happen. This can be achieved by supplying or releasing heat from a system of reactants. This can achieved faster by using a catalyst.
((|Vtrue-Vobserved|) / (Vtrue)) x 100
1.77777%error
<u>Answer:</u> The given reaction is a chemical change and equation for rust is given below.
<u>Explanation:</u>
A chemical change is defined as the change where a change in the chemical composition takes place and results in the formation of a new substance. These reactions are usually an irreversible reaction.
A physical change is defined as the change in the shape and size of a substance. No change in the composition of a substance takes place as no new substance is formed. These reactions are usually reversible reaction.
For the given reaction:
The given reaction is a chemical change because new substances are being formed. This is an example of double displacement reaction because exchange of ions is taking place.
The formation of rust is also a chemical change because a reddish-brown coating on iron metal is being formed which is the rust. The equation for the following chemical change is:
Pure substances can be categorize into "Elements" and "Compounds"
Hope this helps!