Answer:
When Iron powder and Sulfur powder are mixed, no chemical reaction will occur, so you will see a physical change. The heterogeneous mixture resulting from mixing Iron powder with Sulfur powder could be easily separated using a magnet. When heating both compounds; however, it is possible to observe a chemical change as Iron Sulfide is formed. This product looks dark, shiny and is solid.
a
quantitative analysis
b
entrophy
c
chemical kinetics
d
stoichiomentry
That would be D Stoichiometry.
Answer:
d
Explanation:
O
A. number of ions
B. number of isotopes
C. number of neutrons
O
D. number of electrons
Answer:
The correct answer is option C.
Explanation:
Atomic number(Z) = Total number of protons present in a nucleus of an atom.
Atomic mass(M) = Sum of protons and neutrons present in the nucleus
M = Z + Total number of neutrons
If we are given with mass number of an element and we are said to determine the atomic number of the compound:
22 = Z + Total number of neutrons
Z = 22 - Total number of neutrons
We will require total number of neutrons to determine the atomic number of an unknown elementthat has a mass number of 22.
Answer:
The force is 19.3N
Explanation:
F = m × a
= 9.2 × 2.1
= 19.3N (3sf)
To understand if the black crust on the silver coins signifies a chemical or physical change, you should determine if the substance's identity is altered. This is because a chemical change transforms the substance into a new material, while a physical change only alters its form. Knowing whether the crust changes the original silver coin's nature can differentiate between the two.
To discern whether the black crust on the silver coins signifies a chemical change or a physical change, you could ask: 'Can the black crust be removed to reveal the original silver coin beneath, without altering the silver coin's composition?'
This question is crucial because the main difference between chemical and physical changes on whether the substance's identity is altered. In a chemical change, substances are transformed into entirely new materials with different properties. An example of this is iron rusting. On the contrary, a physical change, such as ice melting into water, does not change the substance's fundamental nature, only its form.
If the black crust on the silver coins is a result of oxidation (combines with oxygen), similar to that in a rusting process, this would indicate a chemical change. However, if the black crust is merely tarnishing that can be polished off to reveal the same silver beneath, this would be an example of a physical change. Thus, understanding whether the crust alters the fundamental nature of the silver is important to differentiate between a chemical change and a physical change.
#SPJ11
Answer:
It is a easy answer you are a noob in this question the properties of water help by giving them water you fool