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
IRINA_888 [86]
3 years ago
6

PLSSS I GIVE BRAINLIEST

Chemistry
2 answers:
tatiyna3 years ago
7 0

Answer:

b

Explanation:

the angular distance of a place east or west of the meridian at Greenwich, England, or west of the standard meridian of a celestial object, usually expressed in degrees and minutes

Elina [12.6K]3 years ago
4 0
B is correct because long is left to right which is west to east
You might be interested in
determine the ph of a buffer that is 0.55 M HNO2 and 0.75 M KNO2. tha value of Ka for HNO2 is 6.8*10^-4
Mariana [72]

Answer:

pH = 3.3

Explanation:

Buffer solutions minimize changes in pH when quantities of acid or base are added into the mix. The typical buffer composition is a weak electrolyte (wk acid or weak base) plus the salt of the weak electrolyte. On addition of acid or base to the buffer solution, the solution chemistry functions to remove the acid or base by reacting with the components of the buffer to shift the equilibrium of the weak electrolyte left or right to remove the excess hydronium ions or hydroxide ions is a way that results in very little change in pH of the system. One should note that buffer solutions do not prevent changes in pH but minimize changes in pH. If enough acid or base is added the buffer chemistry can be destroyed.

In this problem, the weak electrolyte is HNO₂(aq) and the salt is KNO₂(aq). In equation, the buffer solution is 0.55M HNO₂ ⇄ H⁺ + 0.75M KNO₂⁻ . The potassium ion is a spectator ion and does not enter into determination of the pH of the solution. The object is to determine the hydronium ion concentration (H⁺) and apply to the expression pH = -log[H⁺].

Solution using the I.C.E. table:

              HNO₂ ⇄    H⁺   +   KNO₂⁻

C(i)        0.55M       0M      0.75M

ΔC            -x            +x          +x

C(eq)  0.55M - x       x     0.75M + x    b/c [HNO₂] / Ka > 100, the x can be                                    

                                                             dropped giving ...

           ≅0.55M        x       ≅0.75M        

Ka = [H⁺][NO₂⁻]/[HNO₂] => [H⁺] = Ka · [HNO₂]/[NO₂⁻]

=> [H⁺] = 6.80x010⁻⁴(0.55) / (0.75) = 4.99 x 10⁻⁴M

pH = -log[H⁺] = -log(4.99 x 10⁻⁴) -(-3.3) = 3.3

Solution using the Henderson-Hasselbalch Equation:

pH = pKa + log[Base]/[Acid] = -log(Ka) + log[Base]/[Acid]

= -log(6.8 x 10⁻⁴) + log[(0.75M)/(0.55M)]

= -(-3.17) + 0.14 = 3.17 + 0.14 = 3.31 ≅ 3.3

3 0
3 years ago
The name of the galaxy we live in is ______________.
Leni [432]

Answer:

Milky way

Explanation:

It has the shape of spilled milk

3 0
3 years ago
What is the difference between a continuous spectrum and a line spectrum? Give a source of each
natima [27]
Continuous spectrum and line spectrum are two types of spectra; their main difference is that continuous spectrum contains no gaps whereas line spectrum contains many gaps.
7 0
3 years ago
A qué llamamos fluido en reposo
Svetach [21]

Answer:

Lo llamas hidrostática

Explanation:

7 0
2 years ago
Read 2 more answers
Which combination(s) of alkyl bromide and carbonyl compound can be used to prepare the following product by reaction of the Grig
Fiesta28 [93]

Answer:

D. only 2 and 3

Explanation:

The Grignard compound or reagent is a highly reactive compound formed from the reaction between an ether solvent containing magnesium and a haloalkane. This compound can also be used to create a C-C bond (carbon-carbon). Based on the properties and structure of a Grignard compound, the answer is option D.

7 0
3 years ago
Other questions:
  • How does vegetation slow and prevent sediment loss?
    8·1 answer
  • Methanol has a density of 0.79g/ml. Calculate the mass of 589ml of methanol.
    9·1 answer
  • Which is the metric root for length?<br> a. gram<br> b. liter<br> c. meter<br> d. second
    5·1 answer
  • In addition to decreasing the amount of fat in a dish, salsa can also increase the amount of
    15·1 answer
  • Why do people put rain gutters on the edges of the roofs of their homes?
    15·2 answers
  • Select the correct answer.
    13·2 answers
  • Gas particles moving through the air due to random motion is called what??
    14·1 answer
  • 6. This part of Earth's atmosphere blocks the sun's harmful rays. (4 points)
    5·2 answers
  • I need yall help with this one and i can make yall brilientist if u get it right plus yall get 50 points
    8·2 answers
  • PLS HELP QUICK ALOTTT OF POINTS
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!