1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Masja [62]
3 years ago
8

Among the elements magnesium, sodium and silicon, which hås the highest second ionisation

Chemistry
1 answer:
FinnZ [79.3K]3 years ago
3 0

Answer:

Explanation:

silicon has highest ionization energy ionization energy increases from left to right in a period because electron are added to same shell and increase in added electron shield each other poorly from the nuclear attraction

You might be interested in
A piece of fossilized wood has a carbon-14 radioactivity that is 1/4 that of new wood. the half-life of carbon-14 is 5730 years.
Marizza181 [45]

Answer:

1.146 x 10⁴ year.

Explanation:

  • The decay of carbon-14 is a first order reaction.
  • The rate constant of the reaction (k) in a first order reaction = ln (2)/half-life = 0.693/(5730 year) = 1.21 x 10⁻⁴ year⁻¹.
  • The integration law of a first order reaction is:

<em>kt = ln [A₀]/[A]</em>

<em></em>

k is the rate constant = 1.21 x 10⁻⁴ year⁻¹.

t is the time = ??? years.

[A₀] is the initial percentage of carbon-14 = 100.0 %.

[A] is the remaining percentage of carbon-14 = 1/4[A₀] = 25.0 %.

∵ kt = ln [Ao]/[A]

∴ (1.21 x 10⁻⁴ year⁻¹)(t) = ln (100.0%)/[25.0 %]

(1.21 x 10⁻⁴ year⁻¹)(t) = 1.386.

∴ <em>t </em>= 1.386/ (1.21 x 10⁻⁴ year⁻¹) =  <em>1.146 x 10⁴ year.</em>

3 0
3 years ago
If you had a 0.800 L solution containing 0.0240 M of Fe3+(aq), and you wished to add enough 1.38 M NaOH(aq) to precipitate all o
guapka [62]

Answer:

0.041 L = 41.3 mL

Explanation:

This problem we will solve by considering the stoichiometry of the reaction and the definition of molarity.

Number of moles in .800 L solution:

0.800 L x 0.0240 M = 0.800 L x .0240 mol/L = 0.0192  mol Fe³⁺

to form the precipitate Fe(OH)₃ we will need 3 times .0192

mol NaOH required = 0.057

given the concentration of 1.38 mol M NaOH we can calculate how many milliliters of NaOH will contain 0.057 mol:

1.L/1.38 mol NaOH x 0.057 mol NaOH = 0.041 L

0.041 L x 1000 mL/1L = 41.3 mL

7 0
3 years ago
A food web is
Allushta [10]
A food web is a graphic representation of all possible energy pathways through an ecosystem.
8 0
3 years ago
0.630 moles of sodium chloride are how many grams (with calculation)
ipn [44]

Answer:

Heyaa!! Im Pinky and Im here to inform you that your answer is...

Explanation:

!!! 36.8189451 Grams !!!

  Have an amazing day!!!

~Pinky~!!

5 0
3 years ago
Read 2 more answers
What mass of NaOH do you need to dissolve in 500ml of solution to obtain a 0.6mol / l solution?
lara31 [8.8K]

Mass of NaOH required = 12 g

<h3>Further explanation</h3>

Given

500 ml solution = 0.5 L

Molarity = 0.6 mol / L

Required

mass of NaOH

Solution

Molarity = moles of solute per liter of solution

M = n / V

solute = NaOH

moles of solute = n  =  M x V

n = 0.6 x 0.5

<em>n = 0.3 moles</em>

Mass of NaOH = mol x MW

mass = 0.3 x 40 = 12 g

3 0
3 years ago
Other questions:
  • Element that has two isotopes has an average atomic mass of 199.7. if 75.56% of the atoms of the element have an atomic mass of
    14·1 answer
  • How much energy is required to raise the temperature of 3 kg of aluminum
    9·1 answer
  • In the following reaction, how many grams of oxygen will react with 10.47 grams of benzene (C6H6)? 2C6H6 + 1502 12CO2 + 6H2O The
    8·1 answer
  • PLEASE ANSWER BOTH QUESTIONS I WILL MARK YOU BRAINLIEST IF IT IS CORRECT!!
    9·1 answer
  • 13 protons , 14 neutrons, and 10 electrons what is the overall charge
    12·2 answers
  • Complete the following single replacement reaction. If they don’t react, just write “NR”
    11·1 answer
  • Will give brainliest
    12·1 answer
  • A sample of potassium has an average atomic mass of 39.0983amu. There are three isotopic forms of potassium element in the sampl
    9·1 answer
  • A gas mixture contains oxygen, nitrogen, and carbon dioxide. It has a pressure of 250 mmHg. If the pressure of oxygen is 50 mmHg
    9·1 answer
  • A piece of string is found to be 35.9 meters long. How long is the string in inches?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!