Answer:
ok
Explanation:
Which of the following is NOT a possible clue that a chemical change has
taken place? *
A change of color
O A change of state
Production of gas
Formation of a precipitate
The scientific tool that measures the change in the temperature during a phase change is a thermometer. Thus, option B is correct.
The scientific tools are the instruments that are used for the analysis and the measurement in scientific studies.
<h3>Which instrument do measures change in temperature?</h3>
The temperature is the degree of hotness and coolness for a substance. The transfer of energy results in the change in temperature between the surroundings and the substance.
The phase change is demonstrated with the change in energy between the sample and the environment. The tool that is used to measure temperature is a thermometer. Thus, option B is correct.
Learn more about scientific tool, here:
brainly.com/question/24449513
1) You will need to use the atomics masses of the elements. So list them:
K: 39 g/mol
C: 12 g/mol
O: 16 g/mol
2) Your base is 100 grams, so you have:
K: 52.1 g
C: 15.8 g
O: 32.1 g
3) Convert grams to moles (dividing each element by its atomic mass)
K: 52.10g / 39 g/mol = 1.336 mol
C: 15.8 g / 12 g/mol = 1.317 mol
O: 32.1 g / 16 g/mol = 2.006 mol
4) Divide all the mol numbers by the least mol number:
K: 1.336 / 1.317 = 1.01
C: 1.317 / 1.317 = 1.00
O: 2.006 / 1.316 = 1.52
5) To have only whole numbers multiply by 2 and round to the nearest whole number
K = 2
C = 2
O = 3
So the empirical formula is K2C2O3
6) Find the molar mass of the empirical formula:
2*39 + 2*12 + 3*16 = 150.
7) Find the number of times that the molecular formula containd the mass of the empirical formula:
150 / 150.22 = 1
Then the molecular formula is the same empirical formula.
Answer: K2C2O3.
The answer is Boron
hope this helps
