# johny

Most popular questions and responses by johny
1. ## chemistry

mass of crucible- 26.4574g mass of crucible and hydrated sample- 27.7617g mass of hydrated sample 1.3043g mass of crucible and dehydrated sample- 27.5693g mass of dehydrated sample- 1.1119g mass of filter paper- 0.7089g mass of filter paper and copper-

2. ## chemistry

how much heat is required to melt 15 g of ice which is at a temperature of 0 degrees celsius

3. ## algebra

Solve the following system of equations. You will type your x value in the first part and the y value in the second part of the question. If the answer is no solution then type NS in both parts and if the the answer is infinite solutions then type I in

4. ## Math

The minimum is (3 π, 5) and the maximum is (5 π, 8). What is the amplitude and what is the period?

5. ## Statistic

Researchers collected samples of water from streams in a mountain range to investigate the effects of acid rain. They measured the pH (acidity) of the water (a lower pH means the water is more acidic). They then classified the steams with respect to the

6. ## Chemistry

You are given the following decomposition reaction of ammonia NH3 ---> H2 + N3 unbalanced When you decompose 12.0g of NH3you produce 1.87 g of H2 Calculate the percent yield of H2

7. ## math

there is a women standing on a building. she sees a car. angle of depresion changes from 28 to 43 . distance traveled is 230 . find the hight of the building

8. ## chemistery

What is the molar concentration of a solution of sulfuric acid, H2SO4, if 4.64 mL react completely with 0.644 g of NaOH which was dissolved in 200 mL of water? Hint given in feedback

9. ## physics

can i have multiple choice questions on thermodynamics: relationship between work and heat, the first law of thermodynamic, and the second law of thermodynamic

10. ## progamming JAVA

1.Write an algorithm, in English, to solve the following problem. Be sure to include pre- and post-conditions! 2.Problem: Solve X mod Y for all positive integers. Do so without using multiplication or division. 3.What is (7 / 3) + (4 % 5)?

11. ## organic

what is the major species present in a solution of glycine at a ph of 2

12. ## calculus

what happens when Limit as x approaches infinity A) (sqrt(9+10x^2))/(7+9x)

13. ## science

why is the pressure more on ground when a person is walking than when he is standing ?

14. ## organic

which substituent increases the acidity of a phenolic hydroxyl group when located next to it? CH3- CH3Cdouble bond O -C double bond N

15. ## math

There is a plane on top of a triangle with angles of 40 degrees and 80 degrees. The 40 degree angle is on the bottom left and the side opposite is Y. The 80 degrees angle is on the bottom right and the side opposite is X. So... What is X and what is Y?

16. ## Math

What is the area of a quadrilateral with sides 24 and 40 and a shared angle of 135 degrees ? Thank you

17. ## Calculus

what happens when the limit goes to infinity 4x-6sqrt(x)

18. ## math 117

can someone help me with this radical numbers problem? (2suare root 8)(2-square root 8) would it be 2 square root 4?

19. ## organic chemistry

what is the first and second step in a alkene halogenation reaction

20. ## Math

How to solve this problem? Here is what I have done so far. 12(1/2)% x (1/2)/(3/4) First i solved the fractions (1/2) x (4/3) =4/6 I changed the 12(1/2)% into a decimal by solving 1/2, which is .5 which equals to 12.5 Answer is 1/12 but I have no idea how

21. ## math

Suzy was putting a stone boarder around her square garden.she las able to complete one side of her garden before she ran out of stones.she usted 9 sones for the first side.How many more stones will she buy to complete her stone boarder?

There is a plane on top of a triangle with angles of 40 degrees and 80 degrees. The 40 degree angle is on the bottom left and the side opposite is Y. The 80 degrees angle is on the bottom right and the side opposite is X. So... What is X and what is Y?

23. ## Math

A building was 210 ft high and a guy was 8 ft from the top and let down a wire that is .44 radians (degrees) to the ground... How long is the wire?

24. ## physics

Imagine a car involved in a head-on crash. The driver, whose mass is m, is to be brought uniformly to rest within the passenger compartment by compressing an inflated air bag through a distance sc. Write an expression for the average force exerted on the

25. ## science

how does the weight of an object change with in sea change with densities ?

26. ## Programming JAVA

1. What is 9.9 + (11 % 8)? 2. Write one line that creates a variable named Pickles that can hold an integer and assign it the value of ten.

27. ## organic

what is the best way to synthesize 4-isopropylbenzonitrile?

28. ## organic

what amine forms an N-nitrosoamine on treatment with NaNO2 in dlute aqueous acid at 0 degrees celsius?

29. ## organic chemistry

What compounds gives diethylamine, on reduction with lithium aluminum hydride?

30. ## organic

what will the structure look like if a tetrahedral intermediate is formed during the reaction of an ester with an amine?

31. ## organic

what is the best synthesis of 4-isopropylbenzonitrile?

32. ## organic

how do you prepare m-bromophenol (E)?

33. ## organic

what amine is forms an N-nitrosoamine on treatment with NaNO2 in dilute aqueous acid at 0' C?

34. ## organic

how do you convert methyl-CH2CH2CH2CH3 to methyl-CH-CL-CH-CL-CH2CH3

1. ## math

Yes

posted on February 1, 2018
2. ## Science

posted on December 5, 2017
3. ## SCIENCE

You are going to fail

posted on March 16, 2017
4. ## Physics

2c

posted on September 8, 2016
5. ## PLZZ HELP ME WITH THIS MATH MS SUE.

this don't help

posted on March 1, 2016
6. ## chemistry

HF is the hydrogen bond in the listed below because hydrogen must be bonded to either a fluorine,oxygen or nitrogen atom.

posted on February 27, 2016
7. ## social studies

true

posted on February 26, 2016
8. ## Math

They are not parallel because they do not have the same slope. They are not perpendicular because their slopes and not opposite reciprocals of each other. So... they are neither. The slope for line A is -5/3 and the slope for line B is 5/3

posted on January 13, 2015
9. ## phi103

display all the possible truth values involved with a set of sentences.

posted on December 7, 2013
10. ## organic chemistry

what site dr bob

posted on February 6, 2009