# Posts by katie

Total # Posts: 2,096

**chemistry**

Thank you so much that cleared up a lot!

**chemistry**

A 20.0 mL sample of 0.687 M HBr is titrated with a 0.216 M NaOH solution. The pH after the addition of 10.0 mL of NaOH is __________.

**History.**

How did the role of the federal government change during the Progressive Era of the early 1900s. Include specific progressive legislation, discuss presidents and the enhanced power of the federal I need some help with finding some information and understanding

**Math**

What is the length of each side of a square that has the same area as a rectangle that is 12 mm long and 18 mm wide?

**physics**

A block is initially sliding along a horizontal surface with 24.6 J of kinetic energy. Friction causes the block’s speed to be halved in a distance of 3.20 m. a) What is the kinetic energy of the block after traveling the 3.20 m? b) What is the magnitude of the kinetic ...

**biology**

What are biomes and how are they influenced by latitude and elevation? Give Examples

**divission**

how do i do a 7 by 10 array look like

**Physics**

You (65 kg) are standing in an elevator traveling upward that passes the 3rd floor at 3.5 m/s and then passes the 4th floor at 4.5 m/s one second later. Find the normal force exerted on your feet by the elevator while it is passing between these floors. I got 6565 N, because ...

**math**

(35) + (-13) + (8) - (-6) = 35 -13 +8 + 6 = 49 - 13 = 36

**math**

4p + 9 + (-7p) +2 = 4p -7p + 9 + 2 = -3p +11 = 11-3p

**math**

4m + 9 + 5m -12 = 42 9m - 3 = 42 9m = 45 m = 5

**math**

y/9 + 5 = 0 y/9 = -5 y = -5 * 9 y = -45

**math**

3q+ 5 + 2q - 5 =65 5q = 65 q =13

**math**

-282 -(+1,017) -282 - 1017 = -1299

**Physics**

At time t = 0, you shoot a cannonball horizontally from the roof of a building at a velocity of 10 m/s. The building has a height of 80 m. Assume g = 10 m/s2 and that there is no air resistance. Write down the algebraic velocity equation for the y-direction of the ball with ...

**Physics**

At time t = 0, you shoot a cannonball horizontally from the roof of a building at a velocity of 10 m/s. The building has a height of 80 m. Assume g = 10 m/s2 and that there is no air resistance. Write down the algebraic velocity equation for the y-direction of the ball with ...

**College Math**

What is number of representatives in MS and what is the ratio of citizens to representatives?

**UPDATE to Ms Sue**

Thanks! I got it right the first time ,but I wasn't shure Thanks a ton!

**UPDATE to Ms Sue**

If JKL is similiar to DEF and JKl has sides that are 11 times greater than those of DEF what is the relationship between the perimeters of the triangles A. They are equal. B.The perimeter of DEF is 11 times greater than the perimeter of JKL. C. The perimeter of JKL is 11 times...

**Update**

If JKL is similiar to DEF and JKl has sides that are 11 times greater than those of DEF

**Update**

what is the relationship between the perimeters of the triangles A. They are equal. B.The perimeter of DEF is 11 times greater than the perimeter of JKL. C. The perimeter of JKL is 11 times greater then DEF. D. The perimeter of JKL is 121 times greater that DEF.

**geometry**

What is the area of a regular pentagon with a side length of 10 inches and a distance from the center to a vertex of 10 inches? Round your answer to the nearest tenth.

**MATH**

what is the relationship between the perimeters of the triangles A. They are equal. B.The perimeter of DEF is 11 times greater than the perimeter of JKL. C. The perimeter of JKL is 11 times greater then DEF. D. The perimeter of JKL is 121 times greater that DEF.

**Update Geometry Question**

What is the probability of a randomly tossed bean bag landing in the yellow target area? Gray is 2m and yellow 0.75m Use 3.14 for pi and round to nearest whole percent. A. 38 B.14 C.36 D.3

**Math**

I am a 4 digit number with 6 hundreds and 5 ones. The sum of all my digits is 15 .What number am I

**physics- please respond**

thank you !

**physics- please respond**

A 0.130kg baseball pitched at 35.5 m/s is hit on a horizontal line drive straight back at the pitcher at 50.5 m/s . Part a: If the contact time between bat and ball is 4.25×10^−3 , calculate the magnitude of the force (assumed to be constant) between the ball and ...

**physics- please respond !**

A 0.130kg baseball pitched at 35.5 m/s is hit on a horizontal line drive straight back at the pitcher at 50.5 m/s . Part a: If the contact time between bat and ball is 4.25×10^−3 , calculate the magnitude of the force (assumed to be constant) between the ball and ...

**ALGEBRA II**

Using a standard deck of cards, find the probability that: 1) You choose two cards and one is a face card and the other is black 2) A black jack and then an ace are drawn

**Social Studies**

It's B - he was really rich and his monopoly just kept getting bigger and bigger, which meant there was essentially no competition and the idea of 'survival of the fittest' became less and less hopeful for other companies. Please answer my question id=1338522681 :)

**physics- MC QUESTION!**

Question: A particle is initially traveling to the right when it hits a wall and turns around to the left. The momentum after the collision is less than the initial momentum. a-the impulse on the particle is to the right b-the impulse on the particle is to the left c-there is ...

**PHYSICS!**

Two blocks are connected by a massless cord and are being pulled to the right by an external force F. They are accelerating at 2 m/s2. If needed, use g = 10 m/s2. With a coefficient of kinetic friction of 0.3, the external force acting on the 8 kg block is most nearly A.55 N B...

**Chemistry**

I did a rough answer to this question with my tutor earlier today and I see what you're saying with the switching, I'm having issues understanding how to do this one properly.

**Chemistry**

4. 5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: 2A + B --> 3C I 2.8x10-5 M 2.5x10-4 0 C -2x -x +3x E 2.8x10-5-2x 2.5x10-4-x 3x10-5 B = 2.5x10-4-x = 2.4x10-4 x = 1x10-5 A = 2.8x10-5-2(1x10-5) = 8x10-6 C = ...

**Chemistry**

3x = 0.006, x = 0.002 A = 0.004 B = 0.006 A2B3 = 0.01-0.002 = 0.008 (0.004)2(0.006)3/(0.008) = 4.32x10-10

**Chemistry**

A2B3 --> 2A + 3B I 0.001 0 0 C –x 2x 3x E 0.001-x 2x 3x 3x = 0.006, x = 0.002 A = 0.004 B = 0.006 A2B3 = 0.001-0.002 = (0.004)2(0.006)3/ Am I close?

**Chemistry**

oh shoot, sorry.. 4. 2A + B --> 3C 3. A2B3 --> 2A + 3B

**Chemistry**

PLEASE fully explain these...I've already tried to figure them out and failed terribly... thanks so much 4. 5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: At equilibrium, there is 4.8 x 10-5 mol of B. ...

**chem**

At what temperature will a 1.0 g sample of neon gas exert a pressure of 500 torr in a 5.0 L container ? or At what temperature will a 0.0470 mol of a gas fill a balloon to 1.20 L under 0.988 atm pressure ?

**social studeis**

why do people celebrate when its kosovo's independence day?

**Chemistry**

25 mL of NaOH 0.16 M is added to 50 mL of 0.1 M HCl. What is the concentration of hydroxide ions in the solution?

**Chemistry**

Calculate the volume of NaOH 0.5 mol/L necessary to neutralize 300 mL of HCl 0.2 M.

**Chemistry**

Calculate the [H+] of a solution obtained by mixing 1 L of hydrochloric acid 1.0 M with 1 litre of sodium hydroxide 0.990 M.

**Chemistry**

What mass of NaOH(s) must be added to 300 mL of HCl 0.25 M in order to completely neutralize this acid?

**Chemistry**

The Kc for the following reaction at 940oC is 1.38. Given the concentrations [CO2] = 0.500 M, [H2] = 0.425 M, [CO] = 0.610 M and [H2O] = 0.695 M, one can conclude that: H2(g) + CO2(g) ↔ CO(g) + H2O(g) Question 8 options: A) the system is not at equilibrium and the ...

**Chemistry**

Which of the following pairs of compounds will give a precipitate in a diluted solution? Question 4 options: A) Cu(NO3)2 and Na2CO3 B) KNO3 and NaCl C) MgCl2 and Ba(NO3)2 D) NH4Cl and Al2(SO4)3

**Chemistry**

A solution contains I-, Br- and OH- ions. If Ag+ is added, what will the precipitate(s) be?

**Chemistry**

Is it 3.9 x 10^-7 M?

**Chemistry**

What is the maximum concentration of Ca2+ ions in a solution containing 0.010 M of F- ions?

**Chemistry**

A mixture of lead, magnesium, nitrate and chromate ions are present in a solution. What will the precipitate be? Question 2 options: A) MgPb B) Pb(NO3)2 C) PbCrO4 D) MgCO3

**chemistry**

You work with the following system: 2X(g) <--> Y(g) At, equilibrium, [Y]=3[X]. If K=10, calculate the [Y] at equilibrium.

**Trig**

If you are dealt 3 cards from a shuffled deck of 52 cards, find the probability that all 3 cards are picture cards.

**Probability**

If you are dealt 3 cards from a shuffled deck of 52 cards, find the probability that all 3 cards are picture cards.

**OSU**

For the equation f(9.5)=P(2.5)^9.5 solve for P.

**Calc 2**

Find the area of the region inside r=19sin(theta) but outside r=3

**algebra**

Mrs Acres will draw a circle on the playground for a game in gym class.The circle will havw a diameter of 16 feet.What is the circumference of the circle that Mrs Acres will paint?

**physics**

A 2.8 kg rectangular air mattress is 2 meters long,.5 meters wide, and .1 meter thick what mass can't support 50% submerged.

**physics**

The driver of a 1,450kg car, whose iron brake calipers mass is 3kg endures a brain malfuction at the top of a 20 degree parking ramp 20 meters long. It approaches the ramp going 20m/s and the driver recovers just as the car reaches the bottom. If the driver captures all the ...

**physics**

Fruity Florida farmers fecklessly fling flying fountains of water on the fruit during cold snaps. Explain why they do this

**Physics**

Suppose an electron was bound to a proton as in the hydrogen atom, but by the gravitational force rather than by the electric force. What would be the radius and energy of the first Bohr orbit?

**physical**

how many time outs do you get in a middle school backetball game. how many fouls have you gotten when you foul out of a middle school basketball game. what does B.E.E.F stand for? how long is a full time out. what is the size OF a girls basketball how high is the basketball ...

**physical science**

Sarah lifts a 345 g shopping bag a distance of 1.2 meters onto a shelf. How much work was done?

**Algebra**

What is the solution set to 8x + 11 = 8x + 8

**physics**

A horizontal water main with a cross-sectional area of 206 cm2 necks down to a pipe of area 42.4 cm2. Meters mounted in the flow on each side of the transition coupling show a change in gauge pressure of 71.0 kPa. Determine the flow rate through the system, taking the fluid to...

**physics**

thank you!!!

**physics**

an isolated quantity of an ideal gas at 297.2 K has a volume of 14.96 L at a pressure of 1.63 atm. What is the volume of this gas sample when the absolute temperature is reduced to one third and the pressure is divided by five?

**TRIG**

Factor 4cos^2x+4cosx-1=0

**Trig**

Factor 4cos^2x+4cosx-1=0

**Alg1, Factoring**

how to factor x^2+2x-3=0

**Alg1**

how to factor x^2+2x-3=0

**math**

Imagine making a tent in the shape of a right prism whose cross-section is an equilateral triangle (the door is on one of the triangular ends). Assume we want the volume to be 2.2 m3, to sleep two or three people. The oor of the tent is cheaper material than the rest: assume ...

**physics**

A recreational (open) hot air balloon (i.e., Pinside is approximately the same as Poutside) has a volume of 2227 m3 when fully inflated. The total weight of the balloon, basket, ballast and pilot is 1775.6 N (399 lb). How much less dense must the air in the balloon be than the...

**English**

("Hannibal" p.16-17)

**statistics**

A researcher wishes to estimate the mean weekly wage of the several hundreds of workers employed by a certain firm within plus or minus 20USD and with a 99% degree of confidence.&...

**Two Multiple Choice American Government Questions**

The chief way the federal government raises revenue is from borrowing money foreign aid individual income taxes corporate taxes This concept means that the total federal budget changes only a little from one year to the next. reconciliation fiscal policy money economy ...

**MATH HELP!**

i have write the equation as a single logarithm 2 lnx-3 lny+1/2 lnz

**physics please help:)**

A car misses a turn and sinks into a shallow lake to a depth of 8.9 m. If the area of the car door is 0.51 m2, what is the force exerted on the outside of the door by the water? Note: 1 atm = 101.325 kPa. What is the force exerted on the inside of the door by the air, assuming...

**Math**

the height, at a given time, of a child above the ground when the child is on the trampoline is shown in the table. determine a algebraic model for the data. Then use the model to predict when the child will reach a height of 3m Time height in metres 0 1m 0.5 4.5 1 6 1.5 4.5 2 1

**chemistry**

Construct the octahedral crystal-field splitting diagram for the metal in each species. Cr4+ Mn(H2O)6^2+

**chemistry**

Which of these ions have one d electron in the outmost d subshell? Zn2+ Fe2+ y2+ Cd2+ Sc2+ Hg2+ Tc2+

**chemistry**

ok thanks

**chemistry**

Which of these ions have five d electrons in the outermost d subshell? Mn2+ Fe2+ Re2+ Y2+ Tc2+ Zn2+ Ru2+

**chemistry**

what are the chemical formula for sodium tetrachloroplatinate(II) and tris(ethylenediamine)cobalt(III) bromide

**chemistry**

How many outer-shell d electrons are there in each of the following transition-metal ions? Re(III) Sc(III) Ru(IV) Hg(II)

**chemistry**

Give the chemical formula for trans-dichlorobis(ethylenediamine)platinum(IV). Use (en) as the symbol for ethylenediamine.

**6th grade math**

35/(2+5)(2^3)-15

**physics**

A mass of 0.7 kg is attached to the end of a massless spring of spring constant 0.35 N/m. It is released from rest from an extended position. After 0.8 s, the speed of the mass is measured to be 1.5 m/s. What is the amplitude of oscillation? What is the total energy (relative ...

**physics**

A 390.0 g block is dropped onto a vertical spring with a spring constant k = 252.0 N/m. The block becomes attached to the spring, and the spring compresses 0.15 m before momentarily stopping. While the spring is being compressed, what work is done by the block's weight? ...

**physics**

A cylinder of mass M=58 kg, radius R=1.3 m and moment of inertia I=(1/2)MR2 is initially rotating around its central axis with an angular velocity ωi= 1.8 rad/s. A tangential force F of constant magnitude applied to the edge of the cylinder during 5.9 s brings it to rest...

**physics**

A bug that has a mass mb = 1 g walks from the center to the edge of a disk that is freely turning at 38 rpm. The disk has a mass of md = 11 g. If the radius of the disk is R = 30 cm, what is the new rate of spinning in rpm?

**chemistry**

using the following mechanism, determine the rate law. 2A <-- --> B+C B+D --> E 2A + D --> C + E k=? please indicate which k you are using for which equation

**chemistry**

The following reaction is a single-step, bimolecular reaction: CH3Br + NaOH --> CH3OH + NaBr When the concentrations of CH3Br and NaOH are both 0.135 M, the rate of the reaction is 0.0070 M/s. (a) What is the rate of the reaction if the concentration of CH3Br is doubled? (b...

**chemistry**

A particular reactant decomposes with a half-life of 103 s when its initial concentration is 0.397 M. The same reactant decomposes with a half-life of 213 s when its initial concentration is 0.192 M. what is the reaction order and rate constant

**chemistry**

A particular reactant decomposes with a half-life of 103 s when its initial concentration is 0.397 M. The same reactant decomposes with a half-life of 213 s when its initial concentration is 0.192 M. Determine rate order and rate constant.

**chemistry**

The rate constant for this first-order reaction is 0.320 s–1 at 400 °C. A--> Products How long (in seconds) would it take for the concentration of A to decrease from 0.830 M to 0.220 M?

**chemistry**

The reaction described by this equation O3(g) + NO(g) -- O2(g) + NO2(g) has the following rate law at 310 K. rate of reaction = 3.0x10^6 M^-1 s^-1)[O3][NO] Given that [O3]=2.0× 10–4 M and [NO]=2.0× 10–5 M at t=0, calculate the rate of the reaction at t=0.

**physics**

A vibration platform oscillates up and down with an amplitude of 8.8 cm at a controlled variable frequency. Suppose a small rock of unknown mass is placed on the platform. At what frequency will the rock just begin to leave the surface so that it starts to clatter?

**chemistry**

I really don't understand rate law. Could you explain that and help with this problem please? Determine the average rate of change of B from t=0 s to t=202 s. A-->2B Time (s) Concentration of A (M) 0 0.74 101 0.45 202 0.16

**physics**

Thank you!

**physics**

A 55.0 kg circus performer oscillates up and down at the end of a long elastic rope at a rate of once every 7.20 s. The elastic rope obeys Hooke's Law. By how much is the rope extended beyond its unloaded length when the performer hangs at rest?