Hydrazine, N₂H₄(aq), is used in the preparation of polymers, pharmaceuticals and rocket fuel.  Hydrazine has alkaline properties similar to ammonia and will act as a weak base.  Given that a 100 mL sample of 0.10 mol/L hydrazine solution has a pH of 10.55 at 25.0 ^oC, write the formula for the conjugate acid and calculate the Ka of the conjugate acid.

Calculate the pH of a 0.025 mol/L solution of sodium nitrite.

A 1250 kg car slams on the brakes and skids on the icy road. If the car has to apply just 562N to get moving again, then 250N to maintain a constant speed (assume air resistance is negligible), what are the coefficients of static friction and kinetic friction of the road. 

You attach a force scale to a toboggan resting in the snow:

-what is the min value of static friction and under what conditions would you observe that value on your force scale

-what happens when you start to pull on the force scale but it remains stationary

-what happens when your applied force exceeds the mas static force

-what happens to the number on the force scale in the moment the toboggan begins to move

-what 2 forces (equal in magnitude opposite in direction) is the scale measuring when you pull on the toboggan and it moves at a constant speed

H2O2(l)+Cu2+(aq)→Cu(s)+O2(g)+2H+(aq)

can someone help me with this question is really confusing and I don't understand, I need it by Tuesday, please... I'm desperate

Calculate the average speed and the average velocity for a ball that is moved according to the following instructions.

the ball (x,y)i=(10.0,-5.0)m

the ball along any curved path somewhere near (x,y)f=(-20.0,-10.0)m.

a.the average speed calculations

b.the average velocity calculations 

c.why the average speed always greater than the magnitude of the average velocity?

can you please show the procedure so I can understand how to do this equation. thank you 

A jet weighs 3260kg and can withstand a max acceleration of "plus 7.33 g's". what is the net force acting on the jet? 

would I put g as (-9.81) or just (9.81)

So my essential question is: how does an individuals perspective of, and response to, a crisis define him or her?

is it okay if I challenge it and write about how their response and perspective of the crisis actually doesn’t define them. Speaking on how it all depends on circumstances and other factors around a persons life therefore that response doesn’t define them. 

can someone help me with this question is really confusing and I don't understand, please.... I'm desperate

a ball along a straight path with the following velocity and time intervals:

-3.0s at 15.0m/s

-7.0s at 20.0m/s

-6.0s at -30.0m/s

-4.0s at 3.5m/s

a.total displacement?

b.displacement in the first 10s?

c.displcement in the last 10s?

d.displacement in the 5.0 - 15.0s time interval?

can you please show the procedure so I can understand how to do this equation. thank you