Most popular questions and responses by khadijah
1. ## Chemistry

How many moles of benzoic acid, a monoprotic acid with Ka=6.4×10^-5, must dissolve in 250mL of H2O to produce a solution with pH=2.04

2. ## Arwachine public

the diagonal of a quadrilateral is 28 cm in length and the perpendicular to it from the opposite vertices are 6.8cm and8cm respectively find the area of the quadrilateral

3. ## World History

What did Michelangelo think of his job painting the ceiling of the Sistine chapel?

5. ## Math

The sum of 16 terms of an AP is -504,while the sum of its 9 terms is -126.find the sum of its 30 terms

6. ## Physics Experiment

In the experiment Standing Waves,if you continue to lwer the water level after recording l(m) at the first sound resonance at fixed tuning fork frequency, you will hear the sound again but sound gets louder (second resonance). At this point, by what factor

7. ## chemistry

1. calculate the volume of concentrated HNO_3 (68%)that is needed to prepare stock solution 0.25M in 1000mL volumetric flask. (density HNO_3 = 1.513 g/cm^3) 2. from above stock solution, determine volume needed to dilute to 500mL volumetric flask that

8. ## Algebra/Trigonometry

Simplify the expression: 1/y - 1/y-3

9. ## Helpp!!! physic...

In the experiment Standing Waves,if you continue to lwer the water level after recording l(m) at the first sound resonance at fixed tuning fork frequency, you will hear the sound again but sound gets louder (second resonance). At this point, by what factor

10. ## Algebra 1

The midpoint of xy is point m (-12, 5) if the coordinates of x are (3, -3 what are the coordinates of y

11. ## World History

List 4 problems / setbacks of the medieval age?

12. ## World history

Explain the big shift after the medieval age

13. ## World history

Giorgio vocari and Leonard da vanci share what nickname? And why?

14. ## physics

Objects that allow bulbs to light when inserted in a circuit

15. ## English

SIMPLE SENTENCE-> Complex Sentence How can i make a complex sentence, out of these sentences: Tom is a boy. He is eight years old. He goes to school in Philadelphia.

1. ## algebra

A basic cellphone plan costs \$20 per month for 60 calling minutes. Additional time costs \$0.40 per minute. The formula 𝐶 = 20+0.40 (𝑥 −60) gives the monthly cost for this plan, C, for 𝑥 calling minutes, where 𝑥 > 60. How many calling minutes

posted on January 8, 2019

A collector has 120 movie posters And 100 band posters. She wants to sell 24 movie posters but still have her poster collection miantain the same ratio of 120:100. If she sells 24 movie posters how many band posters should she sell? Explain.

posted on January 10, 2017
3. ## world geography

this answer is not up to date

posted on September 8, 2015
4. ## Chemestry

Sn+2

posted on August 23, 2015
5. ## help me pls geometry

After drawing four squares, Chen completed this chart showing the length of the sides of each square and the area of each square. According to Chen’s chart, if A is the area and s is the length of a side, what can you conclude is the formula for the area

posted on December 9, 2013
6. ## Chemistry

metals are .ductile and malleable .shiny .sonorous .have high melting and boiling points .mostly hard .mostly dense every metal have these qualities but there are some exceptions to

posted on December 26, 2011
7. ## physics

the ans of part (c) is: the fate of the lost energy is that it will make the surroundings warm

posted on December 26, 2011
8. ## Mathematics : Arithmetic Sequence

common difference=3,1st term=6and general term=3+3n

posted on June 20, 2011
9. ## physics

objects that allow bulbs to light when inserted in a circuit

posted on December 9, 2010