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AlladinOne [14]
3 years ago
8

Riley is doing an experiment working with friction. He wants to find two ways to modify an object that could increase or decreas

e the same type of friction.
Which methods could he use to perform his experiment?
Chemistry
2 answers:
Shtirlitz [24]3 years ago
5 0
Riley can either change the surface area of the object or can change the slipperiness of the material.
valentina_108 [34]3 years ago
5 0

Answer:the answer is B increasing the surface area and areodynamic design. Just took the test .

Explanation:

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What could cause a less than 100% yield?
Phantasy [73]
That’s a dumb question, because It depends on the experiment. I would guess “a” or “d” because in most cases running out of time during a lab, or getting impatient, etc can give you a lower yield.

Unless I’m misreading “d”, it just seems like a more in-depth version of “a”. So it wouldn’t hurt to try that one.
8 0
4 years ago
Solid potassium chlorate decomposes into solid potassium chloride and oxygen gas. If 2.00 g potassium chlorate decomposes in a c
abruzzese [7]

Answer : The final chamber pressure is 0.746 atm.

Explanation:

First we have to calculate the moles of KClO_3.

Molar mass of KClO_3 = 122.5 g/mole

\text{ Moles of }KClO_3=\frac{\text{ Mass of }KClO_3}{\text{ Molar mass of }KClO_3}=\frac{2.00g}{122.5g/mole}=0.0163moles

Now we have to calculate the moles of O_2.

The balanced chemical reaction will be:

2KClO_3\rightarrow 2KCl+3O_2

From the balanced reaction we conclude that,

As, 2 moles of KClO_3 react to give 3 moles of O_2

So, 0.0163 moles of KClO_3 react to give \frac{3}{2}\times 0.0163=0.0244 moles of O_2

Now we have to calculate the pressure of gas.

Using ideal gas equation:

PV=nRT

where,

P = pressure of gas = ?

V = volume of gas = 0.800 L

T = temperature of gas = 25.0^oC=273+25.0=298K

R = gas constant = 0.0821 L.atm/mole.K

n = number of moles of gas = 0.0244 mole

Now put all the given values in the ideal gas equation, we get:

P\times (0.800L)=0.0244mole\times (0.0821L.atm/mole.K)\times (298K)

P=0.746atm

Therefore, the final chamber pressure is 0.746 atm.

3 0
4 years ago
Identify each of the following household substances as a strong electrolyte, weak electrolyte, or non-electrolyte: salt solution
wolverine [178]

Answer:

Electrolytes are substances that can ionize in water. They could be acids, bases or salts as long as they give ions when they dissolve in water.

Explanation:

  • <em>Strong electrolytes</em> completely ionize when dissolved in water, leaving no neutral molecules. The strong electrolytes here are:<u> salt water</u>, <u>baking soda (NaHCO3) solution.</u>
  • <em>Weak electrolytes</em> do not completely dissociate in solution, and hence have a low ionic yield. Examples of this would be<u> vinegar </u>and <u>bleach </u>(which could be sodium hypochlorite or chlorine, which are weakly dissociated).
  • <em>Non-electrolytes </em>will remain as molecules and are not ionized in water at all. In this case, <u>sugar solution is a non-electrolytes</u>, even though sugar dissolves in water, but it remains as a whole molecule and not ions.

8 0
4 years ago
Is Explosion of nitroglycerin a chemical or physical change
Fynjy0 [20]
It's a chemical change beacause elements are combining to make something new! :)
8 0
4 years ago
Read 2 more answers
If you have 6 moles of reactant A and excess of B and C, how much product E would be formed
pychu [463]
B and C are in excess so amount of E will be determined by A. 

Amount of product is determined by limiting reagents - Always.

Hence 6 moles of E will be formed.

Hope this helps!
3 0
4 years ago
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