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
geniusboy [140]
3 years ago
13

How many neutrons do (k) potassium-39 and potassium-40 have, respectively?

Chemistry
1 answer:
Maurinko [17]3 years ago
7 0
Potassium’s atomic number in periodic table is 19, Potassium can only have a mass numbers of 41, 40 and 39. Potassium 39, 40, and 41 are all different isotopes of the element potassium. Each of the isotopes has 19 electrons and 19 protons but the number of neutrons vary. So, in your question Potassium-39 has twenty (20) neutrons, and potassium-40 has 21 neutrons.
You might be interested in
______________Helps the earth continue to go around the sun
pashok25 [27]
Inertia is your answer
4 0
2 years ago
It takes 93.75 mL of a 0.200 M NaOH to neutralize 75.0 mL of an unknown
borishaifa [10]

Answer:

the answer is the second option

5 0
2 years ago
In a lab, the mass of object A is 2.5 kg. Object A weighs:
zzz [600]
24.5 N hope it helps
4 0
3 years ago
Read 2 more answers
What is the pH of a solution with an [H+] of (a) 5.4 x 10-10, (b) 4.3 x 10-5, (c) 5.4 x 10-7?
IgorLugansk [536]

Answer:

a. 9.2

b. 4.4

c. 6.3

Explanation:

In order to calculate the pH of each solution, we will use the definition of pH.

pH = -log [H⁺]

(a) [H⁺] = 5.4 × 10⁻¹⁰ M

pH = -log [H⁺] = -log 5.4 × 10⁻¹⁰ = 9.2

Since pH > 7, the solution is basic.

(b) [H⁺] = 4.3 × 10⁻⁵ M

pH = -log [H⁺] = -log 4.3 × 10⁻⁵ = 4.4

Since pH < 7, the solution is acid.

(c) [H⁺] = 5.4 × 10⁻⁷ M

pH = -log [H⁺] = -log 5.4 × 10⁻⁷ = 6.3

Since pH < 7, the solution is acid.

3 0
2 years ago
What is the main source of energy in a clear water stream in an open area
solniwko [45]

Answer:

c.sunlight

Explanation:

4 0
2 years ago
Read 2 more answers
Other questions:
  • In the unit 2 lab, what combination produced a brown bubbly liquid that looks like root-beer? (Select the two parts of the combi
    8·1 answer
  • Scientific predictions based on laws are formulated using:
    7·2 answers
  • Corey Bayer is a 15-year-old patient at Inner City Health Care. He sustained an injury to his right wrist today during soccer pr
    8·1 answer
  • Aaleyah learned that astronomers use different properties, such as their
    6·1 answer
  • The chemical equation below shows the reaction between carbon dioxide (CO2) and lithium hydroxide (LiOH). CO2 + 2LiOH mc011-1.jp
    13·2 answers
  • How do you explain density column?
    8·1 answer
  • What is the action of a catalyst
    12·1 answer
  • Which detail shows ways that people can help stop Asian carp from spreading?
    12·1 answer
  • How much O2 could be produced from 2.59 g of KO2 and 4.56 g of CO2?
    9·1 answer
  • Does the pH increase or decrease, and does it do so to a large or small extent, with each of the following additions?(a) 5 drops
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!