Answer:
When they like engage their students at a high level
Probably do some hands on experiments with their students so that the kids can actually have some fun.
When they know their students learning styles .
Explanation:
I don't know it just came to my mind. This is what I'd expect from a good science teacher.
Answer:
Cu + Fe 3 Pb 2 +
Explanation:
the most reactive metal is the strongest reducing agent but weakest oxidizing agent. And therefore copper being the least reactive turns to be the strongest oxidizing agent followed by iron then lead.
A colloid is a mixture in which one substance of microscopically dispersed insoluble particles are suspended throughout another substance. However, some definitions specify that the particles must be dispersed in a liquid, and others extend the definition to include substances like aerosols and gels.
The types of colloids includes sol, emulsion, foam, and aerosol.
- Sol is a colloidal suspension with solid particles in a liquid.
- Emulsion is between two liquids.
- Foam is formed when many gas particles are trapped in a liquid or solid.
- Aerosol contains small particles of liquid or solid dispersed in a gas.
Answer:The percent composition by mass of hydrogen in is 6.32 %.
Explanation:
Molecular mass of the = 79 g/mol
Mass of the hydrogen atom present in one formula unit of :
The percent composition by mass of hydrogen in is 6.32 %.
Answer:
a) 64.27%
b) 58%
c) ethanol is the limiting reactant
d) ethanol is the limiting reactant
Explanation:
We have to note that the expected yield is the theoretical yield while the actual mass or amount of product formed is the actual yield.
a) theoretical yield=68.3g
Actual yield= 43.9 g
Percentage yield= 43.9/68.3 ×100
Percentage yield= 64.27%
b) theoretical yield= 0.0722 moles
Actual yield = 0.0419
Percentage yield= 0.0419/0.0722 × 100
Percentage yield= 58%
c) note that the limiting reactant yields the least number of moles of product
Ethanol will be the limiting reactant since it is not present in excess.
d) from the reaction equation;
1 mole of acetic acid produces 1 mole of ethyl acetate
0.58 moles of ethanol produces 0.58 moles of ethyl acetate
1 mole of acetic acid yields 1 mole of ethyl acetate
Hence 0.82 moles of acetic acid yields 0.82 moles of ethyl acetate
Hence ethanol is the limiting reactant.