Here is a quick answere: The charge of a strontium ion is +2. The charge of an ion is determined by the amount of electrons compared to the number of protons, so a charge of +2 indicates that the ion has two more protons than electrons.
The whole Activity , poem and paragraph is missing in the question.
Answer:
(1) Liquid A
(2) Solid A
Explanation:
Using this part of the given poem
Substances and mixtures behave differently,
During boiling and melting most especially
Boiling point of substance is fixed while mixture is not
Substance melts completely but mixture does not
The boiling point of the Pure substance remain fixed after reaching its boiling point this is shown by Liquid A
Solid A is melting completely so Solid A is a pure substance.
Answer:Flouride it creates enamel.
Explanation:
enamel (that's the tooth's hard outer surface) more resistant to acids produced by the bacteria living on the teeth and gums.
1. How do the different stages of development affect a person’s ability to react to situations? Explain briefly.
A temperature change in a reaction indicates a chemical change
