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DochEvi [55]
3 years ago
10

Help me please it’s all due soon

Chemistry
2 answers:
trapecia [35]3 years ago
7 0

Omg we did this but i forgot how to do it oh and i failed the test so um try to type the same problem on google that's how i got all the right answer on my homework. Watch this video tells you the answer https://youtu.be/S8GjkD296gg

taurus [48]3 years ago
5 0
1,2,1,2. Fill the number in in order
You might be interested in
Define and explain the causes of climate change
fiasKO [112]

Answer:

The primary cause of climate change is the burning of fossil fuels, such as oil and coal, which emits greenhouse gases into the atmosphere—primarily carbon dioxide. Other human activities, such as agriculture and deforestation, also contribute to the proliferation of greenhouse gases that cause climate change

7 0
3 years ago
Calculate the number of milliliters of 0.753 M KOH required to precipitate all of the Pb2+ ions in 135 mL of 0.775 M Pb(NO3)2 so
MrRa [10]

Answer:

278 ml of KOH.

Explanation:

The equation for the reaction is: Pb(NO3)2(aq) + 2KOH(aq) --> Pb(OH)2(s) + 2KNO3(aq)

Pb(NO3)2:

Half ionic equation:

Pb(NO3)2(aq) --> Pb2+ + 2NO3^-

Pb(OH)2 --> Pb2+ + 2OH-

Volume = 135 mL

Molar concentration = 0.775 M

Number of moles = molar concentration * volume

= 0.775 * 0.135

= 0.105 mol of Pb(NO3)2

Since 1 mole of Pb(NO3)2 reacted with 2 moles of KOH to give 1 mole of Pb2+ (Pb(OH)2).

By stoichiometry,

Number of moles of KOH = 0.105 * 2

= 0.21 mol

Molar concentration = number of moles/volume

Volume = 0.21/0.753

= 0.278 l

To ml, 0.278 l * 1000 ml/1l

= 278 ml of KOH.

3 0
3 years ago
Can you please answer the question shown below?​
Yuki888 [10]

Answer:

Nothing is shown below!!!

6 0
3 years ago
Read 2 more answers
How does the equation F= ma tell you that it is easier to push a small chair than a large couch
Reika [66]

Explanation:

\boxed{ \mathsf{F = ma}}

The <u>Newton's Second law of motion,</u> also known as The <em>Law of mass and acceleration,</em> derives the given equation in terms of mass, acceleration and force.

It actually states that Force applied on a body is equal to the time rate of change of it's momentum.

Momentum of a body, is the product of it's mass and velocity with which its moving.

This clarifies that objects at rest have zero momentum since they have zero velocity.

If a "source" applies force on an object, it's magnitude would depend on its rate of change of momentum with time.

Since, mass of an object is a fixed entity, so change in momentum would be caused due to change in velocity.

Now, if we happen to have two objects of different mass,

(As, in here, a chair and a large couch) and we have to push them so as to produce the same change in momentum, the force applied on a couch would be more than that applied on the chair.

<h3>Answer:</h3>

This is simply because,

<u>Force = mass × acceleration </u>

If acceleration for both the objects is fixed, the force applied differs due to theur difference in mass.

Note here that Force I'd directly proportional to mass.

The greater the mass is, the higher is the force required to produce same acceleration.

Thus, objects with higher mass will require a greater amount of force to have the same acceleration as the object of light weight.

7 0
2 years ago
The technetium-99 isotope has a half-life of 6.0 hours. If 100.0 mg were injected into a
BartSMP [9]

Answer:

12.5mg of technetium-99 remain

Explanation:

When a radioactive isotope decays in the time, its concentration follows the equation:

ln[A] = -kt + ln[A]₀

<em>Where [A] could be taken as the mass of radioactive isotope after time t (18h), </em>

<em>k is rate constant = ln 2 / Half-Life = ln 2 / 6hours = 0.1155hours⁻¹ </em>

<em>[A]₀ is initial amount of the isotope = 100.0mg</em>

<em />

Replacing:

ln[A] = -0.1155hours⁻¹ *18hours+ ln[100.0mg]

ln[A] = 2.5257

[A] =

<h3>12.5mg of technetium-99 remain</h3>

8 0
3 years ago
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