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
Olin [163]
3 years ago
10

Early people observed their surroundings and relied on...

Chemistry
2 answers:
Damm [24]3 years ago
6 0
Either instinct or observation
PolarNik [594]3 years ago
4 0
Each Other and the sun but now a days we relied on our phones
You might be interested in
If 20.0 ml of glacial acetic acid (pure hc2h3o2) is diluted to 1.40 l with water, what is the ph of the resulting solution? the
Y_Kistochka [10]

By using the formula, mass = density x volume, we calculate mass in grams

 20.0 mL CH₃COOH x (1.05 g / mL) = 21.0 g CH₃COOH 

To find the moles, molar mass of CH₃COOH = 60.05g/mol<span>

21.0 g </span>CH₃COOH x (1 mole CH₃COOH / 60.05 g CH₃COOH) = 0.350 moles CH₃COOH 

To find molarity,<span>

[</span>CH₃COOH] = moles CH₃COOH / L of solution = 0.350 / 1.40 = 0.250 M CH₃COOH<span> 

When </span>CH₃COOH is dissolved in water, it produces small and equal amounts of H₃O⁺+ and C₂H₃O₂⁻. 

<span>
Molarity ,         </span>CH₃COOH<span> + H</span>₂O <==> H₃O⁺ + C₂H₃O₂⁻ 

<span> <span>Initial                      0.250                          0           0 </span>
Change                      -x                            x            x 
Equilibrium            0.250-x                        x            x 

K</span>ₐ = [H₃O⁺][C₂H₃O₂⁻] / [HC₂H₃O₂] = (x)(x) / (0.250-x) = 1.8 x 10⁻⁵

<span>Since K</span>ₐ is relatively small, we can neglect the -x term after 0.250 to simplify 

<span>x</span>² / 0.250 = 1.8 x 10⁻⁵ 

x² = 4.5 x 10⁻⁶ 

<span> x = 2.1 x 10</span>⁻³<span> = [H</span>₃O⁺] 

pH = -log [H₃O⁺] = -log (2.1 x 10⁻³) = 2.68

8 0
3 years ago
2.107 × 10^24 calculate the number of moles​
bulgar [2K]
2.1070000000000003e+24
3 0
3 years ago
Is a polyatomic ion electrically neutral?
marin [14]

No "ion" is electrically neutral.  If it's an ion, then it's charged.


7 0
3 years ago
Read 2 more answers
WILL GIVE OUT BRAINLIEST..
pogonyaev
Iron-Metal
Boron, Carbon- Same period
Cobalt,Iron- Same family
Hydrogen- smallest atomic number
If C is 20 D should be 21
3 0
3 years ago
A 4.52 l sample of nitrogen gas at a temperature of −25°c has a pressure of 723 mm hg. what will be the volume of this sample at
LenKa [72]
Do you have answer choices?
8 0
3 years ago
Other questions:
  • When Na and Cl combine to form a compound, which atom(s) will become a cation?
    11·2 answers
  • CS2 (s) + 3 O2 (g) → CO2 (g) + 2 SO2 (g)
    7·1 answer
  • HBr + H₂SO₄ SO₂ + Br₂ + H₂O<br><br> whats the oxidizing agent and whats the reducing agent?
    13·2 answers
  • Which of the following is a correct formula unit? PbCl AlP Li3Al ClO
    14·2 answers
  • How is clay deposited to form shale?
    9·1 answer
  • What volume of 10,0 M H2SO4 is required to prepare 4.0 L of 0.50 M H2SO4?
    10·1 answer
  • Write the minumum volume of 6 m of hcl necessary to neutralize completely the hydroxide in 750.0 ml of .107 m naoh
    6·1 answer
  • A sentence with the word atom
    13·2 answers
  • Help asap plz thank you!
    7·2 answers
  • Show all work and units cancellation. 1000mL = 1 L, 1000 g = 1kg
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!