Answer:
The electron configuration for a
Mn3+ ion is [Ar]3d4
Explanation:
Answer:
The determination of the nature of the combination of the two separate materials in the original material that looks pure is based on the characteristic of the change process they undergo to become two separate materials.
Therefore, they can know if they initially had a mixture or a compound by the following steps;
1) If the two separated materials can be easily remixed to form the original material, then they likely have a mixture of the two separate materials
2) If the process that results in the formation of the two separate materials, involves the absorption or evolves heat or other forms of energy, then the original substance was a compound
3) If the two newly formed materials is seen to be a permanent change, then the original material was a compound
Explanation:
Answer:
The number of valence electrons in an atom is reflected by its position in the periodic table of the elements (see the periodic table in the Figure below). Across each row, or period, of the periodic table, the number of valence electrons in groups 1–2 and 13–18 increases by one from one element to the next
Answer:
Disagree
Agree
Agree
Disagree
Explanation:
A chemical change is one in which a new kind of substance is formed. It is always accompanied by energy changes.
- It is wrong to assert that all chemical changes are dangerous. In our body system, chemical changes are constantly happening.
- Chemical changes shows the law of conservation of mass in that the amount of reactants and products are always the same.
- Chemical reactions occur when two substances are chemically combined together.
- Not all dissolution reaction are chemical changes. For example, when sugar dissolves in water, it is not a chemical change.
