El Niño = the boy, La Niña = the girl. You can tell from the ending and the first word.
Answer:
The answer to your question is Isotope
Explanation:
Isotopes are atoms with the same number of protons and electrons but their atomic mass is different due to their number of neutrons is different.
In this kind of elements, the number of protons stays the same.
Some isotopes are radioactive but others do not.
Some isotopes are used to know the age of fossils or ancient things.
Answer:
(a) An experiment was conducted, response variable is the concentrations of the chemical
Explanation:
According to Oxford dictionary; an experiment is; "a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact."
The aim of the entire study is to discover the concentration of a certain chemical at various depths of the river. This means that the entire procedure was undertaken for the purpose of discovery. Hence it is an experiment.
The independent variable here is the depth of the river while the response variable is the concentration of the chemical of interest at each depth.
A responding variable changes as changes are made in the independent variable. The variable that is manipulated in an experiment is the independent variable.
The reactivity of the halogens increases the group. This is because chlorine is more reactive than bromine. However, if chlorine is bubbled through potassium bromide solution a displacement reaction occurs.
