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yKpoI14uk [10]
2 years ago
9

What is an accurate description of a period in the periodic table

Chemistry
2 answers:
crimeas [40]2 years ago
7 0

Answer:

period is a horizontal row of the periodic table

Explanation:

A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor

Feel free o copy and paste

Brrunno [24]2 years ago
3 0

Answer:

The periods of the periodic table are the horizontal rows.

Explanation:

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A solution is prepared by mixing 200.0 g of water, H2O, and 300.0 g of
VikaD [51]

Answer:

Mole Fraction (H₂O)  =  0.6303

Mole Fraction (C₂H₅OH)  =  0.3697

Explanation:

(Step 1)

Calculate the mole value of each substance using their molar masses.

Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol

Molar Mass (H₂O): 18.014 g/mol

200.0 g H₂O            1 mole
---------------------  x  ------------------  =  11.10 moles H₂O
                                 18.014 g

Molar Mass (C₂H₅OH): 2(12.011 g/mol) + 6(1.008 g/mol) + 15.998 g/mol

Molar Mass (C₂H₅OH): 46.068 g/mol

300.0 g C₂H₅OH              1 mole
----------------------------  x  --------------------  =  6.512 moles C₂H₅OH
                                         46.068 g

(Step 2)

Using the mole fraction ratio, calculate the mole fraction of each substance.

                                            moles solute
Mole Fraction  =  ------------------------------------------------
                               moles solute + moles solvent

                                                  11.10 moles H₂O
Mole Fraction  =  -------------------------------------------------------------
                               11.10 moles H₂O + 6.512 moles C₂H₅OH

Mole Fraction (H₂O)  =  0.6303

                                             6.512 moles C₂H₅OH
Mole Fraction  =  -------------------------------------------------------------
                               11.10 moles H₂O + 6.512 moles C₂H₅OH

Mole Fraction (C₂H₅OH)  =  0.3697

7 0
1 year ago
Check the statement(s) that is(are) true. Check All That Apply An excited atom can return to its ground state by absorbing elect
Natalija [7]

Answer:

The energy of electromagnetic radiation increases as its frequency increases.

The frequency and wavelength of electromagnetic radiation are inversely proportional.

Explanation:

According to Max Plank's equation, the energy of electromagnetic radiation is given by E=hf where h= Plank's constant and f= frequency of the electromagnetic radiation. This means that the energy and frequency of electromagnetic radiation and its energy are related by a direct proportion. As frequency of the electromagnetic radiation increases, the energy of the radiation increases also.

However, frequency and wavelength of electromagnetic radiation are inversely related. The frequency decreases with increasing wavelength of electromagnetic radiation.

5 0
3 years ago
(08.04 MC)
Veronika [31]

Answer:

Both have a pH greater than 7, but NH₃ has a lower pH than KOH.

Explanation:

  • Both of NH₃ and KOH are bases (can produce OH⁻), so both have a pH greater than 7.
  • NH₃ is considered as a weak base (not completely ionized), while KOH is a strong base (completely ionized).
  • If both NH₃ an KOH has the same concentration, KOH produces OH⁻ higher than that of NH₃.
  • So, NH₃ has a lower pH than KOH.

  • Thus the right choice is:

<em>Both have a pH greater than 7, but NH₃ has a lower pH than KOH.</em>

<em></em>

5 0
2 years ago
A 55.50 g gas sample of a gas, at stp, has a volume of 15.0 l. calculate the molecular mass of the gas
natta225 [31]
Answer is: the molar mass of gas is 82.83 g/mol.
m(gas) = 55.50 g; mass of gas.
V(gas) = 15.0 L; volume of gas.
Vm = 22.4 L/mol; molar volume of gas on STP.
n(gas) = V(gas) ÷ Vm.
n(gas) = 15 L ÷ 22.4 L/mol.
n(gas) = 0.67 mol; amount of gas.
M(gas) = m(gas) ÷ n(gas).
M(gas) = 55.5 g ÷ 0.67 mol.
M(gas) = 82.83 g/mol.


3 0
3 years ago
Read 2 more answers
What will happen when additional reactants are added to a system at equilibrium ?
Pachacha [2.7K]
Additional reactants would break equilibrium
5 0
3 years ago
Read 2 more answers
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