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
pav-90 [236]
3 years ago
13

Can someone help? this is hard .​

Chemistry
1 answer:
Natali [406]3 years ago
4 0
Drawing something can be pretty hard but with a little practice you should be able to draw anything.
You might be interested in
Drag each label to the correct location. An element’s position in the periodic table provides information about its atomic struc
Mekhanik [1.2K]

Answer:

Wa hatjejr jdbdj aldvdid so ini

4 0
3 years ago
Read 2 more answers
Determine the resulting pH when 75 mL of 0.05M HBr is reacted with 74 mL of 0.075 M KOH
Sunny_sXe [5.5K]

Answer:

pH = 12.08

Explanation:

  • H⁺ + OH⁻ → H₂O

First we <u>calculate how many moles of each substance were added</u>, using <em>the given volume and concentration</em>:

  • HBr ⇒ 0.05 M * 75 mL = 3.75 mmol HBr
  • KOH ⇒ 0.075 M * 74 mL = 5.55 mmol KOH

As HBr is a strong acid, it dissociates completely into H⁺ and Br⁻ species. Conversely, KOH dissociates completely into OH⁻ and K⁺ species.

As there are more OH⁻ moles than H⁺ moles (5.55 vs 3.75), we <u>calculate how many OH⁻ moles remain after the reaction</u>:

  • 5.55 - 3.75 = 1.8 mmoles OH⁻

With that<em> number of moles and the volume of the mixture</em>, we <u>calculate [OH⁻]</u>:

  • [OH⁻] = 1.8 mmol / (75 mL + 74 mL) = 0.0121 M

With [OH⁻], we <u>calculate the pOH</u>:

  • pOH = -log[OH⁻] = 1.92

With the pOH, we <u>calculate the pH</u>:

  • pH = 14 - pOH
  • pH = 12.08
6 0
3 years ago
What is the chemical formula of trisilicon tetranitride? A. Si3N4 B. Si4N3 C. Si3N6 D. Si6N3 E. Si4N6 Reset Next
kherson [118]

The answer is Si3N4 (A).

5 0
3 years ago
Read 2 more answers
How do you make Nitrogen become Oxygen? <br><br> add protons, add electrons or add neutrons
sasho [114]

Answer:

electrons

Explanation:

im not totaly sure

3 0
3 years ago
What is the main purpose of patent attorneys?
Yakvenalex [24]

the answer is: protect rights to new products and processes

7 0
3 years ago
Read 2 more answers
Other questions:
  • Determine the molality of a solution of methanol dissolved in ethanol for which the mole fraction of methanol is 0.135. Give you
    9·1 answer
  • You are trying to determine the volume of the balloon needed to match the density of the air in the lab. You know that if you ca
    14·1 answer
  • An unknown compound has the empirical formula CH2O and a molecular mass of 180 amu. What is the molecular formula of the compoun
    13·1 answer
  • What effect does a catalyst have on a system in equilibrium?
    6·2 answers
  • Which orbital is the first to fill with electrons in a given principal energy level?
    6·2 answers
  • Why are scientific method important in the study of science
    6·1 answer
  • 9. The prefix oct- means
    9·1 answer
  • Please help me with this
    10·1 answer
  • When talking about volume, milliliters is used for
    14·2 answers
  • How does the appearance of<br> the protist differ from that of the onion sample?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!