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
Stolb23 [73]
3 years ago
14

Which of the following statements is true?

Chemistry
2 answers:
Darya [45]3 years ago
7 0
B. The nucleus of an atom contains protons and neutrons.
jeka57 [31]3 years ago
3 0
B. The nucleus of an atom contains protons and neutrons. 
You might be interested in
What refers to the body’s inability to maintain a stable internal environment.
dalvyx [7]
One term could be allostasis, the opposite of homeostasis.

Other antonyms of homeostasis, the body's ability to maintain a stable internal environment, include imbalance, instability, etc.
8 0
3 years ago
Read 2 more answers
Determine the pHpH of an HFHF solution of each of the following concentrations. In which cases can you not make the simplifying
PIT_PIT [208]

The question is incomplete, complete question is :

Determine the pH of an HF solution of each of the following concentrations. In which cases can you not make the simplifying assumption that x is small? (K_a for HF is 6.8\times 10^{-4}.)

[HF] = 0.280 M

Express your answer to two decimal places.

Answer:

The pH of an 0.280 M HF solution is 1.87.

Explanation:3

Initial concentration if HF = c = 0.280 M

Dissociation constant of the HF = K_a=6.8\times 10^{-4}

HF\rightleftharpoons H^++F^-

Initially

c          0            0

At equilibrium :

(c-x)      x             x

The expression of disassociation constant is given as:

K_a=\frac{[H^+][F^-]}{[HF]}

K_a=\frac{x\times x}{(c-x)}

6.8\times 10^{-4}=\frac{x^2}{(0.280 M-x)}

Solving for x, we get:

x = 0.01346 M

So, the concentration of hydrogen ion at equilibrium is :

[H^+]=x=0.01346 M

The pH of the solution is ;

pH=-\log[H^+]=-\log[0.01346 M]=1.87

The pH of an 0.280 M HF solution is 1.87.

6 0
3 years ago
Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that
victus00 [196]

Answer:

D

Explanation:

the production of an odor would indicate that the heat ignited a chemical reaction

6 0
3 years ago
Read 2 more answers
Where does cellular respiration
Svetradugi [14.3K]

Answer:

Number 2

Explanation:

3 0
3 years ago
Read 2 more answers
NEED ASAP
schepotkina [342]
Non of these bc it makes the most likely
5 0
3 years ago
Read 2 more answers
Other questions:
  • A student dissolved 3.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution
    5·1 answer
  • In 2005, a Nevada silver mine exported 200 tons of silver. In 2008, as the silver supply became exhausted, it only exported 25 t
    10·2 answers
  • CHEMISTRY HELP PLEASE *answer all questions please*
    7·1 answer
  • Describe the interconnection between photosynthesis and cellular respiration.
    11·1 answer
  • Please help I’m torn between A and B. I’ve asked many and people say A, but I asked my science teacher and she said B. And also
    9·1 answer
  • A man is traveling on a camel through the desert. The Camel travels 25 miles in 5 hours. What is the average speed of the camel?
    12·2 answers
  • From the list of substances selected, Naci and NH4CL are good electrolytes because they will form ions in soluti True False​
    11·1 answer
  • Kinetic energy CANNOT be converted into potential energy<br> True<br> False
    6·2 answers
  • Which of the following lists contain ONLY metals?
    14·1 answer
  • Real life example of when temperature increases, then the pressure increases.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!