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mote1985 [20]
3 years ago
13

This is how fluorine appears in the periodic table.

Chemistry
2 answers:
Aleksandr-060686 [28]3 years ago
6 0

Answer:

A

Explanation:

irina1246 [14]3 years ago
4 0
9 is the atomic number of fluorine
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What are the two rules for deciding the number of significant digits in the answer to a calculation?
8090 [49]
<span>(1) For multiplication and division, you determine the number of significant digits in each number in your problem. The significant digits of your answer is determined by the number with fewer digits. (2) For addition and subtraction, you determine the place value of each number in your problem. The significant digits of the answer is determined by the number that is least precise.</span>
8 0
3 years ago
Describe the changes in energy that occur when a marshmallow is burned over a fire?
boyakko [2]

Answer:

When marshmallows are toasted, a chemical change occurs. The sugar molecules in the marshmallow are being changed into carbon (1). Sugar can be changed into water molecules. ... The flame on stage - oxygen diffuses to the surface of the marshmallow from the surrounding air.

6 0
4 years ago
Do pressure and temputer remain consant in earth interior
hjlf

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no

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3 0
3 years ago
Enter your answer in the provided box. what is the emf of a cell consisting of a pb2 / pb half-cell and a pt / h / h2 half-cell
sp2606 [1]

Answer:

The emf of the electrochemical cell has been calculated to be <u>3.364.</u>

in order to calculate the emf we need to apply Nernst equation.

The emf has been the potential of the cell in the reaction with the change in the electrons in the reaction. The emf of the cell has been given by the Nernst equation as -

                            emf= E⁰ cell - 0.059/n. log 1/concentration

Computation for the emf of the cell

  The given cell has the number of electrons transfer, n= 2

  The concentration of   Pb2= 0.57 M

  The concentration of   H= 0.090 M

The cell potential of the reaction has been= -0.126

Substituting the values for the emf of the cell:

                  emf= -0.126- 0.059/2 * log 1/ [0.57]x [0.090] ²

                  emf= 1.555* 2.337

                  emf=3.634 v

The emf of the electrochemical cell has been calculated to be 3.634 v.

Learn more about emf here-

brainly.com/question/9425530

#SPJ4

4 0
2 years ago
The nitrogenous base adenine is found in all members of which group?
svetoff [14.1K]

Answer:

<h2>ATP, RNA, NAD and DNA.</h2>

Explanation:

A nitrogenous base; it is an organic molecule containing a nitrogen, carbon and other atoms that has the chemical properties of a base that is why they are called as bases. The nitrogenous bases are;  i) adenine, ii) guanine, iii) thymine, iv)  uracil  and v)cytosine.

Adenine is a nitrogenous base which is found in ATP, RNA. NAD, FAD and DNA. adenine pairs with thymine in DNA synthesis.

3 0
3 years ago
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