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
baherus [9]
3 years ago
10

Enter a balanced chemical equation for the reaction between potassium metal and liquid water.

Chemistry
1 answer:
Oksanka [162]3 years ago
6 0

Answer:

  • 2K (s) + 2H₂O (l) → 2KOH (aq) + H₂(g)↑

Explanation:

<u>1) Word equation (given)</u>

  • Potassium + water → ?

<u>2) Kind of reaction</u>

  • <em>Potassium</em> is an alkali metal.

This is a single replacement reaction.

Alkali metals is the group of metals in the group 1 of the periodic table. These are the most active metals, meaning that they react violently with water releasing hydrogen gas.

  • Alkali metals can lose an electron to form compounds with oxidation number +1.

  • The general equation for the reaction of an alkali metal and water is:

         Metal + Water → hydroxide + gaseous hydrogen

            X + H₂O → XOH(aq) + H₂ (g) ↑

<u>3) Chemical equation</u>

  • K (s) + H₂O (l) → KOH(aq) + H₂(g)↑

<u>4) Balance</u>

  • 2K (s) + 2H₂O (l) → 2KOH(aq) + H₂(g)↑

There is the same number of each atom on both sides: 2 K in the left and in the right, 4 H in the left and in the right, and 2 oxygen in the left and in the right. So, the equation is balanced.

You might be interested in
4.8 moles of Kl are dissolved in 850 mL of water. What is the molarity of the solutions?
AURORKA [14]
Hey there!

Molarity = 4.8/850 x 1000 =5.647mol/lit or 5.65M

Hope this helps you dear :)
Have a good day :)
4 0
1 year ago
Purest form of carbon is
vladimir2022 [97]

Answer:

Obtención. El carbono se encuentra - frecuentemente muy puro - en la naturaleza, en estado elemental, en las formas alotrópicas diamante y grafito. El material natural más rico en carbono es el carbón (del cual existen algunas variedades). Grafito: Se encuentra en algunos yacimientos naturales muy puro.

4 0
3 years ago
Read 2 more answers
Maria wants to determine which type of disinfectant kills the most bacteria.
murzikaleks [220]

Answer:

well she can test both of the soap by putting one on and plate and another on the other plate and which ever is cleaner is your answer

6 0
3 years ago
Read 2 more answers
Neutralizing an olympic size swimming pool is conceptually very similar to performaing a massive titration experiment. Suppose a
MrRissso [65]

Answer:

6,97x10⁻³ gallons

Explanation:

pH is defined as:

pH = -log [H⁺]

Thus, you need to have, in the end:

10⁻⁷ = [H⁺]

And you have, in the first:

10^{-9,33} = [H⁺]

The volume of swimming pool is:

700'000 galllons ×\frac{3,78541 L}{1 gallon} = 2649787 L

Thus, the moles of H⁺ in the first and in the end are:

First:

10^{-9,33}mol/L × 2649787L = 1,24x10⁻³ moles

End:

10^{-7}mol/L × 2649787L = 0,265 moles

Thus, the moles of H⁺ you need to add are:

0,265 - 1,24x10⁻³ = <em>0,26376 moles</em>

These moles comes from 10M HCl, thus, the volume in gallons you need to add are:

0,26376moles*\frac{1L}{10moles}* \frac{1gallon}{3,78541L} =

<em>6,97x10⁻³ gallons</em>

<em></em>

I hope it helps!

7 0
3 years ago
Uranium-238 decays to lead-206 with a half-life of 4.5 x 109 yr. Determine how much uranium-238 decays in milligrams (to three s
Mamont248 [21]

Answer:

2.15 mg of uranium-238 decays

Explanation:

For decay of radioactive nuclide-

                        N=N_{0}.(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}

where N is amount of radioactive nuclide after t time, N_{0} is initial amount of radioactive nuclide and t_{\frac{1}{2}} is half life of radioactive nuclide

Here N_{0}=4.60 mg, t=4.1\times 10^{9}yr and t_{\frac{1}{2}}=4.5\times 10^{9}yr

So,N=(4.60mg)\times (\frac{1}{2})^{\frac{4.1\times 10^{9}}{4.5\times 10^{9}}}

so, N = 2.446 mg

mass of uranium-238 decays = (4.60-2.446) mg = 2.15 mg

3 0
3 years ago
Other questions:
  • After raining when do rain drops dry away easily on a cloudy day or on a sunny day? explain
    5·2 answers
  • Can you measure tenths if a gram with confidence using balance?
    12·1 answer
  • What are the three keys to keeping water clean? effective cleanup of oil and gasoline spills adding sediment to the water to red
    10·2 answers
  • Which of the following four senses experience transduction?
    12·1 answer
  • The emission spectrum for an element is? Select all that apply
    8·1 answer
  • Beaches along the eastern and western coasts of North America are composed chiefly of quartz grains.
    14·1 answer
  • By studying a star's spectrum, scientists can work out its chemical make-up and temperature. What instrument do astronomers' use
    6·2 answers
  • Meterologists track the location of Jet Streams. How do jet streams influence the weather? *
    8·1 answer
  • The soil of the rainforest is nutrient poor. How do plants that have roots in the rainforest floor obtain the nutrients they nee
    8·2 answers
  • Convert each of the measurements given to the new unit stated using the factor label method (dimensional analysis). Show all wor
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!