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Effectus [21]
3 years ago
11

This is how fluorine appears in the periodic table.9 F Flourine 19.00 What information does “9” give about an atom of fluorine?

the atomic number
the atomic mass
the number of protons
the number of electrons
the number of neutrons
Check all that apply.
Chemistry
2 answers:
siniylev [52]3 years ago
8 0
The atomic number, the number of protons and the number of electrons.
Nataliya [291]3 years ago
8 0

Answer:

atomic number

number of protons

number of electrons

Explanation:

Fluorine is the first member of the halogen group. It has an atomic number, Z = 9 and atomic mass (A) = 19. The element is represented as:  ₉F¹⁹

Atomic number (Z) = number of protons = number of electrons for a neutral atom

Atomic mass (A) = number of protons + number of electrons

Thus the number 9 represents:

-The atomic number

-number of protons

-number of electrons

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Which property of metals allows aluminum to be flattened into thin sheets of aluminum foil?
Gnoma [55]

Answer:

malleability

Explanation:

3 0
3 years ago
How do you preform water displacement
malfutka [58]
<span>1. Fill a beaker or graduated cylinder with enough water to completely immerse the sphere in. 2. Record the baseline initial measurement. 3. Drop the sphere in. 4 <span>Record final measurement.</span></span>
6 0
3 years ago
the reaction of aluminum with chlorine gas is shown 2Al + 3Cl2 -&gt; 2AlCl3 based on this equation how many molecules of chlorin
Vanyuwa [196]

45 molecules of chlorine gas (Cl₂) are needed to react with 30 atoms of aluminum (Al)

The balanced equation for the reaction is given below:

2Al + 3Cl₂ —> 2AlCl₃

From the balanced equation above,

2 atoms of Al required 3 molecules of Cl₂.

With the above information, we can determine the number of molecules of Cl₂ needed to react with 30 atoms of Al. This can be obtained as follow:

From the balanced equation above,

2 atoms of Al required 3 molecules of Cl₂.

Therefore,

30 atoms of Al will require = \frac{30 * 3}{2}\\ = 45 molecules of Cl₂.

Thus, 45 molecules of chlorine gas (Cl₂) are needed to react with 30 atoms of aluminum (Al)

Learn more: brainly.com/question/24918379

3 0
2 years ago
Choose the aqueous solution below with the highest freezing point. These are all solutions of nonvolatile solutes and you should
GrogVix [38]

Answer:

0.200 m K3PO3

Explanation:

Let us remember that the freezing point depression is obtained from the formula;

ΔTf = Kf m i

Where;

Kf = freezing point constant

m = molality

i = Van't Hoff factor

The  Van't Hoff factor has to do with the number of particles in solution. Let us consider the  Van't Hoff factor for each specie.

0.200 m HOCH2CH2OH - 1

0.200 m Ba(NO3)2 - 3

0.200 m K3PO3 - 4

0.200 m Ca(CIO4)2 - 3

Hence, 0.200 m K3PO3 has the greatest van't Hoff factor and consequently the greatest freezing point depression.

8 0
3 years ago
How many molecules are in 4.00 x 10^2mg of ibuprofen?
Serggg [28]
Start by converting mg to g. There is .001g in every miligram, so there is 0.4g in this sample.

Then find the molar mass of ibuprofen (C13H18O2) which is 206.3g/mol

Then divide grams by the molar mass to get moles of C13H18O2: (0.4g)/(206.3g/mol) = 1.94x10^-3mol C13H18O2

Then multiply moles by Avogadro's number to get molecules: (1.94x10^-3mol)/(6.02x10^23) = 1.17x10^21 molecules of ibuprofen (C13H18O2)
3 0
3 years ago
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