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Sholpan [36]
2 years ago
8

The gas formed when coal is heated in the absence of air_____________

Chemistry
1 answer:
aleksandr82 [10.1K]2 years ago
6 0
The anser is- Carbon dioxide
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How many hydrogen atoms are in each molecule of trisilylamine?
lord [1]

Answer:

  • <u>9</u>

Explanation:

The amine functional group is obtained by subsititution of one or more hydrogen atoms in the ammonia compound.

Ammonia is NH₃.

Then,

  • by substituting one hydrogen you obtain R - NH₂.

  • by substituting two hydrogens you obtain R' - NH - R''

  • by subsituting the three hydrogens you obtain:

                        R'''

                         |

                 R' -  N - R''

In this case, the three subsitutuents are silyl groups. The silyl group is derived form silane and is SiH₃. So, the tcompound <em>trisilylamine</em> is:

                    SiH₃

                      |

          SiH₃ -  N - SiH₃

Thus, you can count 3 hydrogen atoms for every silylgroup for a total of <u><em>9 hydrogen atoms in each molecule of trisilylamine.</em></u>

7 0
3 years ago
Newton's 2nd Law says the acceleration of an object depends on its ______ and the amount of _______ acting on it.
maksim [4K]

Answer:

Newton's 2nd Law says the acceleration of an object depends on its <u>mass </u>and the amount of <u>net force</u> acting on it.

Explanation:

Definition of acceleration:

The acceleration is rate of change of velocity of an object with respect to time.

Formula:

a = Δv/Δt

a = acceleration

Δv = change in velocity

Δt = change in time

Units:

The unit of acceleration is m.s⁻².

Acceleration can also be determine through following formula,

F = m × a

a = F/m

This is the newton's second law:

"The acceleration of an object depends on its <u>mass </u>and the amount of <u>net force</u> acting on it"

The acceleration is depend directly on the force while inversely on the mass.

6 0
3 years ago
PLEASE HELP ME URGENT!!! How do i find mass when not given in chemistry
Arisa [49]

Answer:

It depends what other values you have. Can you give more info? If they give density then you can solve for m.

3 0
2 years ago
Two 0.9mL aliquots of the same specimen are placed in test tubes. To one is added 0.1 mL of water (spec A). To the other is adde
Tanya [424]
We assume that the method that made use of urea was able to recover all of the recoverable substance. The method in question is the method that makes use of water.
The total amount of substance is 43 mg/dl. The recovered amount is 25 mg/dl. The percent recovery is
(25 mg/dl / 43 mg/dl) * 100 = 58.14%
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3 years ago
How are dissolved minerals in water related to sedimentary rocks?
emmasim [6.3K]
Because they are both broke apart over time
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