Answer:
Chloride ion
Explanation:
The anion present in the unknown solution would be chloride ions.
A white precipitate of silver chloride is usually formed when drops of silver nitrate are added to a solution containing chloride ions. The ionic equation is as below:
b. False
Answer: The given statement is false.
Explanation:
A chemical reaction is a reaction which brings change in chemical composition of reactants resulting in formation of new compounds which have different chemical properties.
For example,
So, when gas is produced in a chemical reaction then it means new compounds are formed due to breakage of old bonds and formation of new bonds.
Thus, we can conclude that the given statement gas produced from a reaction is a phase change and not a chemical change, is false.
B) Polaris
C) Both A & B
D) The north pole
Mass of oxygen : 54 g
Conservation of mass applies to a closed system, where the masses before and after the reaction are the same
Reaction
mass before reaction = mass after reaction
mass C + mass O₂= mass CO₂
The measurement 0.020 km has two significant figures, which are '2' and '0' after '2'.
The number of significant figures in a number refers to the digits that carry meaning and contribute to the accuracy of the measurement. In the given measurement of 0.020 kilometers, there are two significant figures. These are the digits '2' and '0' located immediately after the '2'.
The zeros before these numbers, such as in '0.020 km', are not significant figures because they simply indicate the position of the decimal point, and they do not contribute to the precision of the measurement.
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