________ investigations allow for the control of variables
2 answers:
Continuous investigation of the research is expected so that the control variables specified are not out of the problem boundary
Chemistry is the study of structures, properties, and changes in matter, and the energy that accompanies them
The material structure includes the forming components and their comparisons, the process of forming bonds or combining components/elements forming them
The nature of the material including the changes in physics and chemical changes
The energy produced or needed and where the source includes the quantity.
The development of chemistry begins with experiments that consist of chemical stages/processes. This process is applied in the form of a scientific method that is commonly used by scientists in carrying out experiments.
This scientific method is carried out in several stages:
1. Observation, grouping, describing or distinguishing subjects that will be carried out research
2. Determine the problem, what limits and how the research process will be carried out
2. Data, collect information either directly or through text/book references
3. Hypothesis, taking conclusions from information collected data
4. Experiments, looking for causes, root causes of the subject under study, through a process of experimentation either on a lab or industrial scale
5. Analysis, making images either graphically or table, qualitatively (general symptoms in observed objects such as colors, textures, shapes) quantitatively (measurement data such as area, weight, volume)
6. Conclusion, based on experiments and data, the hypothesis can be rejected or accepted
7. Compilation of laws or theories, hypotheses that have been tested through various experiments can be compiled a theory
Variables, which are objects in the study can be determined in 2:
1.Independent variable, which is a variable that can be changed according to the purpose of the experiment
2. Fixed variable, i.e. variable whose value is constant and observed to determine changes in independent variables
We can control the independent variables according to the results of the experiment to find conditions that have the most optimal results so that the expected goals of the boundaries of the problems that have been set will be achieved.
Continuous investigation of the research is expected so that the control variables specified are not out of the problem boundary
the scientific method steps and process
the Scientific Method
scientists use the scientific method
the purpose of the scientific method
Keywords: scientific method, fixed variable, an independent variable
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Answer:
206 mL
Explanation:
In the annexed picture you can see your same question, just in another format.
First we <u>calculate the total moles of CuF₂ that are required in the working solution</u>:
1967 μM ⇒ 1967 / 10⁶ = 1.967 x10⁻³M
1.967 x10⁻³M * 0.275 L = 5.409x10⁻⁴ mol
Now we divide those moles by the concentration of the stock solution, to <u>calculate the volume</u>:
5.409x10⁻⁴ mol ⇒ 5.409x10⁻⁴ * 1000 = 0.5409 mmol
0.5409 mmol ÷ (2.63 mmol/L) = 0.206 L
0.206 L ⇒ 0.206 * 1000 = 206 mL
