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ELEN [110]
3 years ago
7

Which actions will change an object’s weight, but not it’s mass?

Chemistry
1 answer:
Anni [7]3 years ago
6 0

Answer:

D

Explanation:

The weight of an object will change if the object is brought farther away from Earth, or placed on a different planet since the force of gravity on the object will change. However, the mass of the object will remain the same regardless of whether the object is on Earth, in outer space, or on the Moon. hope this helps have a good day :)

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A 100.0 mL solution containing 0.864 g of maleic acid (MW=116.072 g/mol) is titrated with 0.276 M KOH. Calculate the pH of the s
Lilit [14]

Answer:

pH = 1.32

Explanation:

                 H₂M + KOH ------------------------ HM⁻ + H₂O + K⁺

This problem involves a weak diprotic acid which we can solve by realizing they amount  to buffer solutions.  In the first  deprotonation if all the acid is not consumed we will have an equilibrium of a wak acid and its weak conjugate base. Lets see:

So first calculate the moles reacted and produced:

n H₂M = 0.864 g/mol x 1 mol/ 116.072 g  =  0.074 mol H₂M

54 mL x  1L / 1000 mL x 0. 0.276 moles/L = 0.015 mol KOH

it is clear that the maleic acid will not be completely consumed, hence treat it as an equilibrium problem of a buffer solution.

moles H₂M left = 0.074 - 0.015 = 0.059

moles HM⁻ produced = 0.015

Using the Henderson - Hasselbach equation to solve for pH:

ph = pKₐ + log ( HM⁻/ HA) = 1.92 + log ( 0.015 / 0.059) = 1.325

Notes: In the HH equation we used the moles of the species since the volume is the same and they will cancel out in the quotient.

For polyprotic acids the second or third deprotonation contribution to the pH when there is still unreacted acid ( Maleic in this case) unreacted.

           

3 0
3 years ago
An unknown or changeable quantity is called a(n)...
alexgriva [62]
I think the answer would be dependent variable. An unknown or changeable quantity is called a dependent variable. It <span>is what you measure in the experiment and what is affected during the experiment. Hope this answers the question. Have a nice day.</span>
6 0
3 years ago
What is the Formula for sodium chlorate
FrozenT [24]
T<span>he Formula for sodium chlorate is- </span>NaClO3. 
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3 years ago
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The space race was between
Leviafan [203]

Answer:

the United States and the Soviet Union.

Explanation:

Basically we were in toe to toe with the russians for space explorations like who's gonna get to space first or moon or do such explorations

4 0
2 years ago
What are six traits of a good scientific observer
Ratling [72]
1. Curiosity-They love to learn                                                                                      2. Open-mindedness- he accepts criticisms fairly well 
3. Rationality- he does not believe in superstitions and think that everything has a scientific explanation 
4. Critical Mindedness & Correct Judgement- he does not easily jump to conclusions but tries to verify his results by (if possible) repeating the experiment 
5. Intellectual Honesty- does not alter his observations and writes the correct observations he has seen 
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Hope This Helped :D</span>
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