Mr. Johnson challenged his students to see which group could dissolve salt the fastest in 100 ml of water. The students could ch
ange any variable(s) except the volume of water used. Group 1 changed the water temperature. They used tap water at 22oC and then three other temperatures: 32, 42, and 52 oC. They did not stir the mixture and they kept the volume of the water constant, just like Mr.Johnson directed. The salt dissolved fastest in the warmest water. In their conclusions, Group 1 wanted to include a line graph of their data. What label(s) should they place on the X axis?
A)rate of dissolving. B)volume of water used. C)time to dissolve (sec). D)temperature of water
To understand why the "water temperature" would be plotted on the X axis, we must first understand what the dependent variables and the independent variables are.
Dependent variables are those that are influenced by another variable to happen. This type of variable can be measured and is usually the basis of the result of the experiment. On the other hand, the independent variable is the one that influences the dependent variable to show a result. In the case shown in the question above, the independent variable is the water temperature, because it influences the dissolution rate (dependent variable) of the salt.
In the graphical representation of the association between two variables, the independent variable is plotted on the X axis. The dependent variable is plotted on the Y axis.
The elements most likely to be found free in nature are the noble gasses. By 'free' we can assume that the question is referring to elements that are not chemically bound. The most chemically inactive elements are the noble gasses, making them the most likely solution.
The big bang theory explained that the universe started as a single entity which was created by massive explosion and it create most of the matter i.e galaxies were moving away from the universe in all directions with great speed which then cause massive explosion and bring about cosmos creation.
The statement "<span>Forces always act alone" is false. Force do not always act alone. It is always accompanied by another force that is always opposite to it. </span>
