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choli [55]
3 years ago
13

9. Apply: Atoms are most stable when their outermost shell is full. If their outermost shell is not

Chemistry
1 answer:
bixtya [17]3 years ago
3 0

Answer:

helium and neon are both noble gases their outermost shells are full or stable the elements will agree with the statement s above

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The density of a liquid can be determined by weighing a known volume of the liquid in a graduated cylinder. the data from the ex
Kipish [7]

Answer:- density of the liquid is 0.21 gram per mL.

Solution:- density=\frac{mass}{volume}

From given data, mass of cylinder = 10.4 g

mass of cylinder along with liquid = 11.7 g

So, mass of liquid = 11.7 g - 10.4 g = 1.3 g

Volume of liquid = 6.2 mL

Let's divide the mass by the volume to get the density of the liquid:

density=\frac{1.3g}{6.2mL}

density = 0.21\frac{g}{mL}

So, the density of the liquid is 0.21 gram per mL.

4 0
3 years ago
ASAP Two different atoms have four protons each and the same mass. However, one has a negative charge while the other is neutral
Vinvika [58]

Answer:

Explanation:

Just a little fundamental knowledge:

   Protons are positively charged particles

   Neutrons do not carry any charges

  Both protons and neutrons are located in the nucleus of an atom. They determine the mass of any atom.

 Atoms having the same mass will have the same number of protons and neutrons. Collectively, the number is called mass number.

 Electrons are negatively charged particles orbiting round the nucleus of an atom. They take up the the bulk volume of the atom. They do not add to the weight of an atom.

The protons, neutrons and electrons are the three fundamental particles in an atom.

Two given atoms:

    A = 4 protons and negatively charge

    B = 4 protons and neutral

Location:

  • By default, in all atoms, the protons and neutrons resides in the nucleus.
  • The electrons are located in the orbitals round the nucleus

Possible number of subatomic particles:

For atom A;

     Protons  = 4

     Electrons  = 4

    Neutrons  cannot be determined.

Note: in a neutral atom, the number of protons and electrons are the same

For atom B:

    Protons = 4

    Electrons = 4 + x where x is the number of electrons gained

    Neutrons  cannot be determined.

When an atom becomes charged, it has lost or gained electrons. A negative charge depicts an atom the has gained additional electrons.

The value of x, is always a positive integer greater than 0 and less than 7

   Electrons can be 5, 6, 7, 8, 9 or 10

When the number of electrons reaches 10, the atom is stable.

4 0
3 years ago
Four research teams measured the length of a rare whale, and what each team wrote in its team notebook is shown in the table bel
vovikov84 [41]

Answer:

Explanation:

Precision relates to instruments of measurement or scale . A scale measuring upto cm is less precise than an instrument measuring upto mm .

Here the first measurement appears to have been taken with an instrument measuring up to metre and the second measurement appears to have been taken with an instrument measuring up to decimeter . So second measurement is most precise .

Third measurement is closest to the actual measurement that is 45.0 m , so it is most accurate measurement .

6 0
3 years ago
Wenzhou prepares 200 mL of a solution of SnCl4in which the concentration ofchloride ions is 0.240M.a) What is the molarity of th
nalin [4]

Answer:  a) 0.06 M

b) 3.13 grams.

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

Molarity=\frac{moles}{\text {Volume in L}}

Moles of  Cl^-=Molarity\times {\text {Volume in L}}=0.240\times 0.2L=0.048moles

The balanced reaction for dissociation will be:

SnCl_4\rightarrow Sn^{4+}+4Cl^{-}

Thus for 4 moles of Cl^-, there is 1 mole of SnCl_4

Thus moles of SnCl_4=\frac{1}{4}\times 0.048=0.012

Molarity of SnCl_4=\frac{moles}{\text {Volume in L}}=\frac{0.012}{0.2L}=0.06M

Thus the molarity of the  SnCl_4 solution = 0.06 M

b) Mass of SnCl_4= moles\times {\text {Molar mass}}=0.012mol\times 260.522g/mol=3.13g

Thus mass of  SnCl_4 Wenzhou use is 3.13 grams.

7 0
3 years ago
Read 2 more answers
Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. Which word equation best represents this chemical reaction
Marianna [84]
<h3>Answer:</h3>

                      2 C₃H₈O  +  9 O₂    →    6 CO₂  +  8 H₂O

<h3>Explanation:</h3>

This is the combustion reaction in which Isopropanol, an organic compound is burnt in the presence of Oxygen to produce Carbon dioxide and water vapors.

The General reaction is as,

                Isopropanol  +  Oxygen    →    Carbon dioxide  +  Water

Chemical formulae of above compounds and molecule are,

Isopropanol =  C₃H₈O

Oxygen  =  O₂

Carbon Dioxide  =  CO₂

Water  =  H₂O

Hence, the balance chemical equation can be written as,

                      2 C₃H₈O  +  9 O₂    →    6 CO₂  +  8 H₂O

4 0
3 years ago
Read 2 more answers
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