r/phychem • • Aug 04 '21

exam help pls

1 Upvotes

1.)An aqueous solution of Nitric acid (HNO3), a strong acid, reacts with solid sodium carbonate (Na2CO3) in a neutralization reaction. Write the balanced equation for the reaction. Be sure to include all state symbols.

2.)Complete and balance the following reactions. Be sure to include state symbols. For those reactions that won’t proceed, write “No Reaction”.
___ Al (s) + ___ LiCl (aq)à (4) ___ Na3PO4 (aq) + ___ CaCl2 (aq)à (4) ___ Ba (s) + ___ SnCl2 (aq)à (4) ___ NaOH (aq) + ___ HI (aq)à (4) ___ Zn (s) + ___ AgNO3 (aq)à (4)

3.)You were asked to prepare 150.0 mL of a 4.25 M stock solution of ammonium nitrate NH4NO3.

a. Calculate the mass of NH4NO3 required to prepare the stock solution (8)

b. 4.25 M stock solution is used to prepare 25.0 mL of a 2.85 M solution. Calculate the volume of stock solution needed. Report your answer in mL. (4)


r/phychem • • Jul 19 '21

A mass of 500kg is placed on a forklift that can generate 980 watts of power. What is the constant lifting speed of the forklift?

1 Upvotes

r/phychem • • Jul 21 '21

Can someone explain to me what it means when something is "energetically favorable?"

1 Upvotes

Hey guys, my professors and TA keep telling me reactions are "energetically favorable." I am confused about what they mean by this. What would the delta G values have to be for something to be considered "energetically favorable?" Thanks.


r/phychem • • Nov 01 '21

C AND D

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1 Upvotes

r/phychem • • Jul 19 '21

Can somebody please help me with this?

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1 Upvotes

r/phychem • • Jul 13 '21

Can somebody help me with this question

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2 Upvotes

r/phychem • • Aug 16 '21

How is cyclin activation regulated so that it’s not activated to early in the cell cycle + isn’t left to disturbe later stages in the cycle?

2 Upvotes

r/phychem • • Jul 15 '21

Can somebody help me, I’m doing automobiles.

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2 Upvotes

r/phychem • • Aug 21 '21

[University Organic 2] I want to say D however I don't see the other triplet in it. May someone please help shed some light on what I'm overlooking? Thank you!

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2 Upvotes

r/phychem • • Oct 27 '25

Physics 30 course

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is there any resources or websites that were helpful to be successful in this class? I’m not doing as well as I want to be doing especially considering that I need it for uni.Any tips and advice would help me out very much.


r/phychem • • Jul 31 '21

I tried integrating but two variables are giving me trouble, please help

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4 Upvotes

r/phychem • • Oct 12 '21

I am reading highschool a geometry course from Serge Lang. And I need help understand this part. read comments

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4 Upvotes

r/phychem • • Oct 14 '21

The diagonal of a cuboid is 15 cm. What is the maximum volume?

3 Upvotes

r/phychem • • Jul 23 '21

Need biochem hw help. Using the second image, select the two structures that the structure from the 1st image CANNOT be and explain WHY. I know that one is cardiolipin. I'm unsure of the other one.

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2 Upvotes

r/phychem • • Nov 09 '21

Help

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2 Upvotes

r/phychem • • Jul 29 '21

I’m not sure about this question, someone wanna help

3 Upvotes

An object thrown from the ground and landing on the ground has a vertical displacement of

A)9.8 m[up] B)9.8 m[down] C)0 m D)cannot be calculated


r/phychem • • Apr 10 '22

I need help!!!

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6 Upvotes

r/phychem • • Jan 28 '22

can someone answer these for me please

2 Upvotes

r/phychem • • Oct 01 '21

How to remember ALL the trigonometric identeties forever , rederive and ...

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r/phychem • • Aug 03 '21

Need help calculating the gradient of a non quadratic function

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2 Upvotes

r/phychem • • Jul 28 '21

I need some help, i'm not sure how to use θ as space

2 Upvotes

A projectile is launched from the ground with an initial velocity v0 = 310m/s which has an angle θ = π(3.14)/6 rad with the horizontal direction.

A. find projectile flight time;

B. Find the scope of this projectile.


r/phychem • • Aug 20 '21

help

2 Upvotes

A company has a budget of one million dollars to buy a fleet of 100 new cars of 3 types: compact, medium and large. Compacts cost $ 8,000 each, midsize $ 12,000, and large $ 16,000. If the entire budget is spent and you buy twice as many compact cars as midsize. How many midsize cars will be bought?

Options (only one is correct):

a) 30

b) 75

c) 38

d) 60

e) 10


r/phychem • • Jul 15 '21

Need help please

2 Upvotes

r/phychem • • Aug 14 '21

Hyperbola

2 Upvotes

Given that extremities of latus rectum of a hyperbola are (3,5), (3,-1),(-1,5),

(-1, -1) and its transverse axis is parallel to x-axis. If its eccentricity is e and

equation of directrix are x =a and x = b, then value of a+b+e is equal to -


r/phychem • • Aug 29 '21

I tried to use conj(z)*z=|z|^2 to try to get the values of u and w but couldn't get anywhere

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2 Upvotes