Answer:
Independent variables are ones that can be controlled and dependent variables are results of these changes. So, in question a, an independent variable is amount of a released energy, in these case in form of heat. We reduced that amount and as a result we get a dependent variable as high temperature of chocolate for longer time, so we changed time of a heat releasing from chocolate. In question b, an independent variable is temperature of water, and a dependent variable is amount of produced oxygen. In question c, an independent variable is an intensity of exercise. When we change the intensity of exercise, as a results, breathing rate is changed, which is dependent variable.
Explanation:
So technicaly the answer is D
Answer:
The mass spectroscopy is most consistent with the element Gd
Explanation:
Here we have the average atomic mass given by the weighted average found by multiplying the abundance in nature of the various isotopes by their observed atomic masses followed by the summation of the multiplication results as follows;
Based on approximate measurement of the chart, we have the values for the relative abundance given as follows;
Isotope, I Relative abundance, A I×A
154 1 154
155 6 930
156 8 1248
157 6.2 973.4
158 10 1580
160 8.5 1360
Sum 39.7 6245.5
Average atomic mass = 6245.5/39.7 = 157.314 atomic mass unit
Atomic mass of Eu = 151.964 u
Atomic mass of Gd = 157.25 u
Atomic mass of Tb = 158.92535 u
Atomic mass of Dy = 162.5 u
Therefore, the mass spectroscopy is most consistent with the element Gd.
Answer:
This isotope of fluorine has 9 protons, 9 electrons and 10 neutrons.
Explanation:
A atom is a basic element
