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
Alex73 [517]
3 years ago
11

Why do Man holes(road) build by use only circular type??

Chemistry
1 answer:
sashaice [31]3 years ago
7 0

Answer: Manholes are usually round, primarily because roundness is the best shape to resist the compression of the earth; covers are round because they are easier to manufacture than square or rectangular shapes, they are easier to move by rolling, and they can't fall into the opening.

Explanation:

You might be interested in
. Which piece of safety equipment is least likely to be at Jerome's lab station? A. Goggles B. A fire extinguisherC. Heat-proof
charle [14.2K]
D a lab coat
hsjjdjjfdh

5 0
3 years ago
HURRY DONT HAVE MUCH TIME LEFT. Vegetarians do not eat animal products but rather derive their protein from plant sources. Which
Leokris [45]

Answer:

b12 and d3

Explanation:

5 0
2 years ago
Integrated Problem 01.69 With current spectroscopic techniques, chemists are generally able to determine the structure of an unk
Gnesinka [82]

a or c becuse it means you should answer it very wiseley

5 0
3 years ago
HNO3 + H2O → H3O^+ + NO3<br> which ones are acids and which ones are bases
nlexa [21]

Answer:

  • HNO₃ and  H₃O⁺ are acids
  • H₂O and  NO₃⁻ are bases

Explanation:

The chemical equation is:

  • HNO₃ + H₂O → H₃O⁺ + NO₃⁻

There are several definitions of acid and bases: Arrhenius', Bronsted-Lowry's and Lewis'.

Bronsted-Lowry model defines and <em>acid</em> as a donor of protons, H⁺.

In the given equation HNO₃ is such substance: it releases an donates its hdyrogen to form the H₃O⁺ ion.

On the other hand, a <em>base</em> is a substance that accepts protons.

In the reaction shown, H₂O accepts the proton from HNO₃ to form H₃O⁺.

Thus, H₂O is a base.

In turn, on the reactant sides the substances can be classified as acids or bases.

H₃O⁺ contain an hydrogen that can be donated and form H₂O; thus, it is an acid (the conjugated acid), and NO₃⁻ can accept a proton to form HNO₃; thus it is a base (the conjugated base).

4 0
3 years ago
Which of the following is an example of kinetic energy?
deff fn [24]

Answer:

A. The energy of moving particles near a fire

Explanation:

7 0
3 years ago
Other questions:
  • Which group on the periodic table would have zero electronegativity because they have a full octet?
    6·1 answer
  • How do you label the delta E, on an energy diagram
    13·1 answer
  • Which of the following substances can be decomposed by chemical change?
    14·1 answer
  • The compound potassium nitrate is a strong electrolyte. Write the transformation that occurs when solid potassium nitrate dissol
    6·1 answer
  • You just measured a metal cylinder and obtained the following information: mass - 3.543 g diameter -0.53 cm height = 4.40 cm. 26
    8·1 answer
  • How many electrons are transferred in the iconic bond between sodium abd chlorine in naci?
    15·1 answer
  • A sample of pure NO2 is heated to 335 ∘C at which temperature it partially dissociates according to the equation 2NO2(g)⇌2NO(g)+
    10·1 answer
  • Balance the equation
    8·1 answer
  • Which statement correctly compares what occurs when molecules absorb photons in the microwave region with what occurs when molec
    6·2 answers
  • What are the names of the elements symbolized by Ba , Na , and Fe , respectively? Spelling counts!
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!