Answer:
A model can represent something very large like the solar system, A model can represent something very small like a single cell, A model can represent something that cannot be seen or touched, A model can represent something very complex like the flow of energy in an ecosystem.
Explanation:
Far away from the atom because think of it like a magnet. Nucleus is positive charge while Electron is negative charge. Put opposite charges together like a magnet its going to attract and take some effort to separate them. Now put two opposite charge a foot away from each other, you should be able to move it no problem.
Iron is matter; since the smallest unit of matter is atoms, iron could be brokolen down into atoms. unlike iron, water is a molecule made from atoms that were chemically combined, so water could be broken down into molecules.
Answer:
the modals of arrangement for first periodic table was. increasing atomic mass and grouping together of elements having similar properties
The given question is incomplete. The complete question is :
Gaseous butane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . If 1.31g of water is produced from the reaction of 4.65g of butane and 10.8g of oxygen gas, calculate the percent yield of water. Be sure your answer has the correct number of significant digits in it.
Answer: 28.0 %
Explanation:
To calculate the moles :
According to stoichiometry :
13 moles of require 2 moles of butane
Thus 0.34 moles of will require= of butane
Thus is the limiting reagent as it limits the formation of product and butane is the excess reagent.
As 13 moles of give = 10 moles of
Thus 0.34 moles of give = of
Mass of
The percent yield of water is 28.0 %