Great question!
Physical changes change the appearance of something or someone.
For example, let's say 2 cats get into a fight. One is left clean in the end of this, with no scratches or bites anywhere, so nothing has happened to it as a physical change.
However, the other cat is left scarred and with bite marks everywhere. All this has left the cat's once-beautiful coat now ragged and torn up. This is an example of a physical change.
↑ ↑ ↑ Hope this helps! :D
Answer:
affect the size, shape, and phase of a substance
Explanation:
Answer:
growing food and selling items
Explanation:
Answer:
(a) Avoid parallax error
(b) To ensure that almost all the SCN⁻ has reacted.
Explanation:
(a) Avoiding bias
A Mohr pipet is a graduated pipet. To avoid bias, you should always hold the pipet so the meniscus is at eye level.
If your eye is above or below the meniscus, you will get an incorrect reading of the volume.
(b) Excess Fe³⁺
I am guessing that you are adding different volumes of SCN⁻ to Fe³⁺ to generate a Beer's Law plot of the concentration of FeSCN²⁺.
The problem is that the reaction is an equilibrium It does not go to completion.
Fe³⁺ + SCN⁻ ⇌ FeSCN²⁺
You use a large excess of Fe³⁺ to drive the position of equilibrium to the right and make sure that almost all the added SCN⁻ is converted to FeSCN²⁺.
Answer:
1258 grams of AgN03
Explanation:
We calculate the weight of 1 mol of AgN03:
Weight 1 mol AgN03= Weight Ag + Weight N +( Weight 0)x3=108g+ 14g+16gx3=170 g/mol
1 mol----170 g AgN03
7,4mol---x= (7,4 mol x170 g AgN03)/1 mol=1258 g AgN03
Answer: 2HCl + CaCO3 => CaCl2+ CO2 + H2O
Explanation:
The equation is now balanced.
2 atoms H in both reactant and product side.
Cl have 2 atoms on both sides.
Ca have 1 atom in both sides.
C have 1 atom on both sides and
O have 3 atoms on both reactant and product side
b. products, reactants
c. elements, atoms
d. reactants, products
The answer is letter D. Reactants, Products