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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:

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write the names of the following compounds. 1) iron + sulphur . 2) manganese + oxygen. aluminium + sulphur​
Vlada [557]

Answer:

  1. FeS
  2. MnO₂
  3. Al₂S₃

Explanation:

<u>1) Iron + Sulphur = ?</u>

→ Iron sulfide

<u>2) Manganese + Oxygen = ?</u>

→ Manganese dioxide

<u>3) Aluminium + Sulphur = ?</u>

→ Aluminium sulfide

8 0
2 years ago
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Use the periodic table to answer the following questions.
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True or false in a chemical reaction some of the atoms will be changed into different type of atoms​
Anika [276]

Answer:

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2 years ago
What is the pH of a solution with a concentration of 1.8 × 10-4 molar H3O+?
Andre45 [30]
PH is defined as the negative log of Hydrogen ion concentration. Mathematically we can write this as:

pH=-log[H^{+}]=-log[H_{3}O]

We are given the concentration of H_{3}O. Using the value in formula, we get:

pH=-log[1.8*10^{-4}]=3.745

Therefore, the pH of the solution will be 3.745
8 0
3 years ago
3,010,000 into scientific notation
skelet666 [1.2K]

Answer:

3.01 x 10 to the power of 6

Explanation:

Step 1

To find a, take the number and move a decimal place to the right one position.

Original Number: 3,010,000

New Number: 3.010000

Step 2

Now, to find b, count how many places to the right of the decimal.

3 0
3 years ago
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