# chelsea

Popular questions and responses by chelsea-
## Chemistry

For the following, 2HBr (aq) + Ba(OH)2 (aq) ---> 2H2O (l) + BaBr2 (aq) write the net ionic equation including the phases

*asked on October 4, 2013* -
## Chemistry

For the following chemical reaction... HCN (aq) + KOH (aq)----> H2O (l) + KCN (aq) write the net ionic equation, including the phases

*asked on October 4, 2013* -
## math

Sides $\overline{AB}$ and $\overline{EF}$ of regular hexagon $ABCDEF$ are extended to meet at point $P$. What is the degree measure of angle $P$?

*asked on March 4, 2020* -
## science

A boy and his skateboard have a combined mass of 64 kg. If he is moving with a speed of 3.2 m/s, and collides with a stationary skateboarder whose mass (including his skateboard) is 96 kg, with what speed will the two skateboarders move immediately after

*asked on February 9, 2013* -
## Chemistry

You purchased a 5.00 pound bag of sugar (sucrose, C12H22O11) at the grocery last week to bake cookies. Conversion: 1 pound = 1 lb = 454 grams. a.How many grams of sucrose did you purchase? 454 grams (g) = 1 pound (lb) 454 g * 5 = 2270 g A 5 pound bag of

*asked on September 23, 2015* -
## Chemistry

H(f) Cl= 121.3 kj H(f) C= 716.7 H(f) CCl4= -95.7 calculate the average molar bond enthalpy of the carbon-chlorine bond in a CCl4 molecule. I have tried to figure it out and keep getting the wrong answer. Please help!

*asked on November 25, 2013* -
## chemistry

If you add 5.0 mL of 0.50 M NaOH solution to 20.0 mL to Buffer C, what is the change in pH of the buffer? (where buffer C is 8.203 g sodium acetate with 100.0 mL of 1.0 M acetic acid) I have calculated the pH of buffer C to be 4.74. Now what? =\

*asked on November 7, 2010* -
## .....

what is the possessive noun in "the purses of the ladies"

*asked on February 14, 2011* -
## chemsitry help again please

Write the formula of the conjugate base for acid HClO2 .

*asked on November 19, 2013* -
## chemistry

Assuming equal concentration rank these by freezing points, Na3PO4, Li2Co3,NH4Cl, and Sn(NO3)4

*asked on January 27, 2013* -
## math

how many 2 card hands are possible with a 26 card deck?

*asked on March 6, 2012* -
## chemistry

will the following solutions be acidic, neutral, or basic? Write the net ionic equation for any reaction that takes place. NH4Cl, KHCO3, LiClO4, NH4NO3, H2CO3, LiClO2, Ba(NO3)2

*asked on July 18, 2011* -
## Physics

A photon has a frequency of 7.3 × 10–17 Hz. Planck’s constant is 6.63 × 10–34 J•s. The energy of the photon, to the nearest tenths place, is × 10–50 J.

*asked on May 11, 2016* -
## maths

a light house flashes every 56 seconds. Another lighthouse flashes every 40 seconds. At 9 p.m. they both flash t the same time. What time will it e when they next both flash at the same time?

*asked on September 26, 2010* -
## Chemistry

Write the balanced neutralization reaction between H2SO4 and KOH in aq. solution. .350 L of .410 M H2SO4 is mixed with .300 L of .230 M KOH. What concentration of sulfuric acid remains after neutralization? ______ M H2SO4

*asked on October 4, 2013* -
## Org. Chem.

Is malonic acid polar or nonpolar? and does it hydrogen bond with water? with methyl alcohol? with hexane? I keep getting different results and would like some help please with explanation.

*asked on September 14, 2009* -
## stats

A particular normal distribution has mean of 575 and standard deviation of 150. What X values form the boundaries for the middle 60% of the data? Round answers to two decimal places. Lower boundary: Blank 1 Upper Boundary: Blank 2

*asked on February 21, 2016* -
## physics

an airplane is flying in a horizontal circle at a speed of 430 km/h if its wings are tilted 40 degrees to the horizontal what is the radius of the circle in which the plane is flying? assume that the required force is provided entirely by an "aerodynamic

*asked on May 27, 2009* -
## Chemistry

A student produced a volatile liquid experiment with the following results: Mass of flask, boiling water, foil cap, and unkown after cooling, g: 83.350 Mass of flask, boiling stone, and foil cap, g: 82.657 Water bath temperature: 95*C Barometric pressure:

*asked on October 27, 2011* -
## Chemistry

NaHCO3 (s) + HC2H3O2 (aq) ---> ?

*asked on October 4, 2013* -
## Math (Area of Shapes)

Suppose that when pizza dough is rolled out it costs 25 cents per square foot, and that sauce and cheese when spread out on a pizza have a combined cost of 60 cents per square foot. Let's say sauce and cheese are always spread out to within 1 inch of the

*asked on October 28, 2012* -
## Calculus

Find expressions for the quadratic functions whose graphs are shown. One graph has the point (4,2) plotted in which the parabola passes through (U-shaped parabola- right side up) The vertex is at (3,0) and the parabola does not touch the y-axis for as much

*asked on September 21, 2010* -
## chemistry

Outline a separation scheme for isolating pure isopentyl acetate from the reaction mixture. ( post lab question for the Banana oil lab)

*asked on July 9, 2013* -
## chemistry

molecular and net ionic equations for FeCl3 + Na2S

*asked on June 21, 2011* -
## URGENT math rate of change

What is the horizontal change between the points (-2, 5) and (4, 10)?

*asked on June 8, 2011* -
## Calc

The monthly cost of driving a car depends on the number of miles driven. Lynn found that in May it cost her $380 to drive 480 mi. and in June it cost her $460 to drive 800 mi. a) Express the montly cost C as a function of the distance driven d, assuming

*asked on September 20, 2010* -
## Physics -Relativity

Question: If a muon is traveling at 70% of the speed of light, how long does it take to decay in the observer's rest frame (i.e., what is the observed lifetime of the muon)? Answer: =??? us

*asked on April 16, 2008* -
## algebra

Given the parent function of f(x) = x3, what is the value of h in the translated graph of f(x − h) + k?

*asked on December 13, 2016* -
## CHEMISTRYYY

What mass of PCl3 forms in the reaction of 70.6 g P4 with 268 g Cl2 ? P4 + 6Cl2 → 4PCl3

*asked on February 6, 2015* -
## Chemistry 22

Table salt NaCl and sugar C12H22O11 are accidentally mixed. A 6.00 g sample is burned and 2.90 g of CO2 is produced. What was the mass percentage of the table salt mixture? Could you please show me all the way through if you can?

*asked on October 5, 2013* -
## Math 9th grade slopes

A line connecting (5, 6) to another point has an undefined slope. What is the closest point on this line with whole number coordinates below (5, 6)?

*asked on May 27, 2011* -
## Physics

Light containing two different wavelengths passes through a diffraction grating with 1300 slits/cm. On a screen 16.0 cm from the grating, the third-order maximum of the shorter wavelength falls midway between the central maximum and the first side maximum

*asked on April 14, 2011* -
## College Physics

A particle experiences a constant acceleration that is north at 100 m/s^2. At t=0, its velocity vector is 60 m/s east. At what time will the magnitude of the velocity be 100 m/s?

*asked on September 13, 2010* -
## chemistry

How many grams (of mass m) of glucose are in 355mL of a 5.50% (m/v) glucose solution?

*asked on November 4, 2013* -
## Chemistry #30

A sample of Br2(g) takes 10.0 min to effuse through a membrane. How long would it take the same number of moles of Ar(g) to effuse through the same membrane?

*asked on October 13, 2013* -
## physics

A criminal is escaping across a rooftop and runs off the roof horizontally at a speed of 5.1 m/s, hoping to land on the roof of an adjacent building. Air resistance is negligible. The horizontal distance between the two buildings is D, and the roof of the

*asked on January 31, 2012* -
## English

Are there any metaphors in the poem Young by Anne Sexton? If so, what are the metaphors?

*asked on November 17, 2011* -
## math rate of change

What is the vertical change between the points (100, 5) and (1000, 5)?

*asked on June 8, 2011* -
## Calc.

Use a linear approximation (or differentials) to estimate the given number. Tan 44 degrees Please help.

*asked on November 15, 2010* -
## Science

1. Which statement about subatomic particles is NOT true? (1 point) Protons and neutrons have almost the same mass. Protons and electrons have opposite charges. Unlike protons and electrons, neutrons have no charge. Protons and neutrons have the same

*asked on October 10, 2008* -
## Chemistry

Part 1: Find the % by mass of each element in camphor (C10H20O). Step 1: Find the atomic mass of each element in the molecule. Atomic Mass of C: 12.0107 Atomic Mass of H: 1.00794 Atomic Mass of O: 15.9994 Step 2: Find the mass combination of each element.

*asked on September 21, 2015* -
## Chemistry #25

Calculate the average translational kinetic energy (sometimes just called average kinetic energy)...for one mole of gas at 381 K.

*asked on October 13, 2013* -
## Chemistry

Write the balanced equation for (aq) Pb(ClO3)2 and (aq) NaI. Include phases. What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with .250 L of .110 M NaI? Assume the reaction goes to completion.

*asked on October 4, 2013* -
## Math

How much mulch will you need to cover a rectangular garden that is 20 feet by 30 feet with a 3 inch layer of mulch? Explain.

*asked on October 20, 2012* -
## physics

Review Conceptual Example 7 before starting this problem. A uniform plank of length 5.0 m and weight 225 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who

*asked on May 23, 2012* -
## Math

Solve the inequality by first rewriting it as an equivalent inequality without absolute value bars. Express solution set using interval notation. | x+3 | +8 is less than or equal to 14 Thanks so much for helping me!

*asked on February 1, 2012* -
## MATH-direct variation

Which of the following represents a direct variation function? The answer coices are A)d=2r B)y=9x+1 C)y=-3 D)a=1/2h(b1+b2)

*asked on June 10, 2011* -
## annuities

8. Mary would like to save $10 000 at the end of 5 years for a future down payment on a car. How much should she deposit at the end of each week in a savings account that pays 12%/a, compounded monthly, to meet her goal? a. What type of annuity is this? c.

*asked on January 17, 2011* -
## Calculus

Find the functions a) f o g, b) g o f, c) f o f, d) g o g, and their domains. f(x)= square root of x, g(x)= cube root of 1-x These are my answers, but I am not sure about them and I only figured out one domain... that is the part that really confuses me.

*asked on September 19, 2010* -
## Org. Chem.

1. Are the following soluble, insoluble, or partially soluble. - Benzophenone in hexane? - 1-octanol in hexane? I think soluble? - 1-butanol in water? in hexane? - methyl alcohol in hexane? I think partially soluble? Please help me and explaining would be

*asked on September 13, 2009* -
## chemistry

For the following chemical reaction, how many moles of silver iodide (AgI) will be produced from 4 mol of calcium iodide (CaI2)?

*asked on April 24, 2015* -
## coordinate algebra

The area of a rectangle is found by multiplying the length by the width: A = lw. A certain rectangle has an area of x2 + 7x + 12. Factor the trinomial to find the length and width of the rectangle. In the form of a paragraph, describe the process necessary

*asked on December 2, 2014* -
## college statistics

the average length of time required for students to complete a test in a an introductory statistics course is found to be 50 minutes with a standard deviation of 12 minutes. if students are allowed 80 minutes to complete the test , approximately what

*asked on November 6, 2014* -
## Calculus II

the gamma function r(x) is defined by r(x)= integral from 0 to infinity of x^n-1(e^-1)dx where n>0. Use integration by parts to show that r(n+1)=nr(n).

*asked on April 7, 2014* -
## Calculus II - Trapezoidal Rule

Find the error resulting from approximation by Trapezoidal Rule: integral (from 0 to 1) sqrt(1+ x^3) dx .... compute the results for n=8

*asked on February 17, 2014* -
## Physics Please check my answers

1. A fluid can only be a liquid. True

*asked on February 3, 2014* -
## Math (PreCal)

Kurt wants to sail his boat from a marina to an islnd 15 miles east of the marina. Along the course, there are several small islands they must avoid. He sails first on a heading of 70 degrees and then on a heading of 120 degrees. What is the total distance

*asked on January 13, 2014* -
## Chemistry

If a solution containing 52.044 g of mercury(II) chlorate is allowed to react completely with a solution containing 15.488 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after

*asked on October 13, 2013* -
## science

4. Bacillus thuringiensis (Bt) is a bacterium that contains a gene that results in the production of a natural pesticide that kills insects. Genetic engineers have successfully inserted this Bt gene into the DNA of some corn varieties, allowing the corn to

*asked on December 19, 2012* -
## geometry

A classroom has a floor area of 600 square feet. What is the floor area of the classroom in square meters? describe three different correct ways to solve this area problem. Each way of solving should use the fact that 1 inch = 2.54cm. Explain your

*asked on October 21, 2012* -
## physics

An explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender metal handrail. The speeds of sound in air, water, and the handrail are 355, 1410, and 5380 m/s,

*asked on April 29, 2012* -
## Math

A farmer has 80 feet of fencing, which she plans to use to fence in a plot of land for a pigpen. If she chooses to enclose a plot along the broad side of her barn, what is the largest area that can be enclosed? (Note: The side along the barn will not

*asked on January 31, 2012* -
## statistics

If a piece of toast falls off your breakfast plate, is it more likely to land with the buttered side down? According to Murphy’s Law (the assumption that if anything can go wrong, it will), the answer is “Yes.” Most scientists would argue that by the

*asked on January 24, 2012* -
## Algebra

Speed of passenger train is 6mph faster than the freight train. The passenger train travels 260 miles at the same time the freight train travels 230 mph. WHAT would be the speed of both the passenger and freight trains?????

*asked on December 13, 2011* -
## math

A shipping company owns a fleet of heavy trucks. If the purchase price of each truck is $245,000 and its value depreciates by 15 percent per year, what is the value of each truck after 4 years? I got $127891.5313. Am i right?

*asked on August 23, 2011* -
## Math

What is the slope of a horizontal line?

*asked on June 6, 2011* -
## Statistics

Supposed (as is roughly correct) that each child born is equally likely to be a boy or a girl and that sexes of successive children are independent. If we let BG mean that the older child is a boy, and the younger child is a girl, then each of the

*asked on May 28, 2011* -
## Identifying patterns

If the pattern of polygons continues, how many sides will polygon 98 have? and there is a picture of polygon 1 which is a 3-sided triangle polygon 2- which is is a sqaure polygon 3- which is a 5 sided pentagon. polygon 4- which is a six sided hexagon

*asked on May 11, 2011* -
## chemistry

the word equation for sodium and water is: sodium+water-->sodium hydroxide+hydrogen sodium and chlorine: sodium+chlorine-->sodium chloride what will the equation for aqueous chlorine with aqueous potassium iodide be?

*asked on October 17, 2010* -
## Calc

Find the functions a) f o g, b) g o f, c) f o f, d) g o g, and their domains. f(x)= square root of x, g(x)= cube root of 1-x These are my answers, but I am not sure about them and I only figured out one domain... that is the part that really confuses me.

*asked on September 20, 2010* -
## math

what is the area of the circumscribed square about a circle having a 12pie perimeter?

*asked on March 17, 2010* -
## Chem.

Why is it not possible to achieve a complete separation of the ethanol from the water in the clarified reaction mixture via simple distillation? I'm not sure about this because I thought the difference between fractional (what was done) and simple

*asked on December 8, 2009* -
## Dr. Russ- Org. Chem.

Yes, there was a difference in my results between the solubilities of benzophenone in methyl alcohol and benzophenone in hexane. Benzophenone [essentially nonpolar (slightly polar due to the C=O bond)] was soluble in methyl alcohol, but only partially

*asked on September 15, 2009* -
## Org. Chem.

why don't water and benzophenone hydrogen bond? benzophenone has a C=O and water forms H bonds too.

*asked on September 14, 2009* -
## Algebra

A group of students plotted the number of hours they worked at a cake shop during the holidays and the number of cakes they delivered in a week. Graph shows 0 to 60 on x axis and y axes at increments of 10. The label on the x axis is Weekly Hours Worked,

*asked on November 13, 2017* -
## Math aglebra

I need help RIGHT NOW!!!!!!!!!!!!!! On the blueprints of Adam's office building, the length of his rectangular office space is 5 1/4 inches. If the actual length of Adam's office space is 10 1/2 feet, what is the scale of the blueprint?

*asked on November 23, 2016* -
## Math

Find the volume of a cake of edge 4cm.

*asked on August 10, 2016* -
## Heart of Darkness

1. Different settings. Consider how Kurtz and the pilgrims act differently in the following settings. • Belgium For this one I said they act very civilized because they want to keep up appearances, but I don't remember any specific examples • The Congo

*asked on December 6, 2015* -
## Chemistry

A compound isolated from oil of mint has a characteristic cool, refreshing odour. It is frequently used in cough drops to ease the pain of a sore throat. This compound contains only C, H, and O. If 95.6 mg of this compound burns completely in O2, and

*asked on October 18, 2015* -
## Chemistry

A compound isolated from oil of mint has a characteristic cool, refreshing odour. It is frequently used in cough drops to ease the pain of a sore throat. This compound contains only C, H, and O. If 95.6 mg of this compound burns completely in O2, and

*asked on October 18, 2015* -
## physics

A speeder driving down the road at a constant 20m/s passes a patrolman parked on the roadside. The patrolman waits 3 seconds then pursue the speeder accelerating at a constant 4m/s2. When does the patrolman catch the speeder

*asked on September 22, 2015* -
## Chemistry

Copper is changed to copper(II) ions by nitric acid according to the following equation: 4HNO3 + Cu → Cu(NO3)2 + 2NO2 + 2H2O How many moles of HNO3 must react to produce 0.961 mol of NO2?

*asked on February 6, 2015* -
## project

Virginia ratified the constitution with the help of all of the following men EXCEPT: A.Washington B.jefferson C.henry D.Madison

*asked on May 6, 2014* -
## Physics

I need to check my answers for the following: An Aston Martin V8 Vantage sports car has a maximum “lateral acceleration” of 0.96 “g’s”, after which the car begins to skid out of its turn. 2.1 Calculate the coefficient of static friction between

*asked on March 31, 2014* -
## Calculus II

show that; given any three non-collinear points (x1,y1), (x2,y2), (x3,y3) there is a parabola p(x)=Ax^2+ Bx + c , containing the three points.

*asked on February 17, 2014* -
## chemsitry

The molecular geometry of POCl3 is tetrahedral. What hybridization does this indicate for the central P atom? Why is the answer spy?

*asked on December 11, 2013* -
## Physics

A pulley of mass mp , radius R , and moment of inertia about its center of mass Ic , is attached to the edge of a table. An inextensible string of negligible mass is wrapped around the pulley and attached on one end to block 1 that hangs over the edge of

*asked on November 24, 2013* -
## Chemistry #27

Given that: H2 (g) + F2 (g) ---> 2HF (g) H(rxn)= -546.6 kJ 2H2 (g) + O2 (g) ---> 2H2O (l) H (rxn)= -571.6 kJ calculate the value for H(run) for... 2F2(g) + 2H2O (l) ---> 4HF (g) + O2 (g) _____kJ?

*asked on October 28, 2013* -
## Chemistry #11

A solution of ethanol (C2H5OH) is prepared by dissolving 35.0 ml of ethanol in enough water to make 120.0 ml of solution. What is the molarity of the ethanol in this solution? 46.07 g= molar mass of ethanol .079 g/ml=density

*asked on October 14, 2013* -
## Chemistry

If a solution containing 52.044 g of mercury(II) chlorate is allowed to react completely with a solution containing 15.488 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after

*asked on October 13, 2013* -
## Chemistry 10

reaction of AgNO3 with BaO... Would it be Ag^+ + O^---> AgO (s)

*asked on October 5, 2013* -
## Chemistry

Zinc reacts with hydrochloric acid according to the reaction equation... Zn (s) + 2HCl (aq) ---> ZnCl2 (aq) + H2 (g) How many milliliters of 5.00 M HCl (aq) are required to react with 5.55 g of Zn (s)??

*asked on October 4, 2013* -
## physics

A 5-kg box is pushed across a horizontal floor by a 20-N force that is angled 30 degrees below the horizontal. What is the coefficient of kinetic friction between the box and the floor if the box is pushed at a constant speed?

*asked on July 10, 2013* -
## PHYSICS

How much heat must be added to 1.0 kg of iron to raise its temperature from 20°C to 95°C? (ciron = 0.11 cal/g•°C)

*asked on July 3, 2013* -
## Health

What type of questions should a patient ask a doctor before getting cosmetic surgery?

*asked on June 14, 2013* -
## Physics! Please help me!

An oscillating block-spring system has a mechanical energy of 5.1 J, an amplitude of 0.81 m, and a maximum speed 1.6 m/s. Find the spring constant k of the spring. What is the mass of the block? What is the frequency of oscillation?

*asked on April 24, 2013* -
## Math

A tower stands on a 20 degree slope. From a point 45 m directly up the slope. The angle of elevation of the top of the tower is 10 degrees. How tall is the tower?

*asked on April 14, 2013* -
## chemistry

If 22.4 dm3 of steam react with MgO, calculate the mass of the product that will form.

*asked on February 18, 2013* -
## Chemistry

How many cubic decimeters of oxygen are needed to react with sulfur to produce 5.00 * 103 cubic decimeters of sulfur dioxide?

*asked on February 18, 2013* -
## Physics

The orbit of a Moon about its planet is approximately circular, with a mean radius of 2.24 × 10 8 m. It takes 35.5 days for the Moon to complete one revolution about the planet. Find the mean orbital speed of the Moon. Answer in units of m/s Find the

*asked on February 12, 2013*