# Posts by emma

Total # Posts: 1,721

**Chemistry**

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.140 M HClO(aq) with 0.140 M KOH(aq).HClO is a weak acid with a Ka of 4.0× 10–8. It reacts with strong base to produce ClO–. (e) after addition of 60.0 mL of KOH

**science**

Calculate the heat of combustion of candle wax in kJ/mole. The standard heat of formation (∆Hf ) of candle wax (C20H42) is -2230 kJ/mole. The standard heat of formation (∆Hf ) of carbon dioxide is -394 kJ/mole. The standard heat of formation (∆Hf ) of water ...

**science**

what is the purpose of meiosis

**science**

what is the differnts between asexual and sexual reproduction

**Science**

I am doing a project on blizzards and I am having a hard time trying to find 3 good interactive websites. Help please? Thanks!

**English**

Good claim/topic sentence for this question? Did Miep Gies face many important challenges during and after the time of the holocaust?

**math**

what does the second term and the fourth term mean?

**Algebra**

Write the expression as a complex number in standard form. ____5____ 2- i =2+5i Did I get the right answer?

**Chemistry**

A solution is prepared by dissolving 0.12 mol of acetic acid and 0.12 mol of ammonium chloride in enough water to make 1.0 L of solution. Find the concentration of ammonia in the solution.

**Algebra**

Use a graphing calculator or a computer to graph the system of inequalities. Give the coordinates of each vertex of the solution region. 5x-3y is greater than or equal to -7 x-2y is greater than or equal to 3 3x+y is greater than or equal to 9 x+5y is less than or equal to 7 I...

**Chemistry**

A solution is prepared by dissolving 0.12 mol of acetic acid and 0.12 mol of ammonium chloride in enough water to make 1.0 L of solution. Find the concentration of ammonia in the solution.

**Geomatry**

If a zipline ends at 8ft above the ground and goes upward at a 6 degree angle, how high will it begin?

**Chemistry**

What volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/mL, should be used to make 4.40 L of an NaOH solution with a pH of 10.5?

**English**

In English, we're learning about the Holocaust and we are answering to "related-to-your-life" questions and below are some questions that I do not understand. Please help! Thank you. Does the U.S. control any countries? Do we have a Chancellor of the US? Who ...

**ACT Explore**

I'm taking the ACT explore tomorrow and I was wondering if there is a writing portion

**Algebra**

Tell whether the graph opens up or down. Find the coordinates of the vertex. Write an equation of the axis of symmetry. Y=3x^2 The graph opens up but I don't get how you would find the coordinates of vertex and how to write the equation of axis of symmetry. Please help!

**Social Studies**

I just took the quiz! (100% correct) 1.) B 2.) B 3.) D

**English**

What is a good topic sentence for an essay about eating insects? *The article (source where I got the info from) was about insect eating and if more countries should try to consume it.

**Physics**

A 4kg mass is pushed with a constant force for 1m then off the edge of the table and lands 7m from the edge of the table. a) What was the force pushing on the mass? b) What is the resultant velocity?

**Math**

Adam uses 1/6,1/3and 2/5 to make a circle graph an colored each a different color. What fraction of the graph is not colored? Explain your answer.

**Application/Writing Sample**

When an application asks for a writing sample, is it a good idea to give them a reflection on a poem?

**geometry**

i guess your right though...:|

**geometry**

i know but it changes from miles to feet and the amount of feet is not enough to be one mile!!!

**geometry**

this rectangular prism is 120 miles in length, 20 miles in width, and 800 feet deep what is the volume????!!?

**Math**

Wirte an exponential growth model. 22. A business had a $20,000 profit in 1990. Then the profit increased by 20% per year for the next 10 years. y=c(1+r)^t y=20,000(1+0.2)^10 Is that correct?

**math**

You divide each side by 12 32/12 = ? therefore, x= ?

**math**

Yes you are correct.

**math**

A=LW 3/4=L5/4 Times each side by 4/5 3/4 times 4/5 =? therefore, L= ?

**Algebra**

Use a calculator to evaluate the expression. Write the result in scientific notation and in decimal form. Did I do think correctly? 6000000 * 324,000 =1.944*10^12 =1944000000000

**Chemistry**

At the temperature of 30degree C and pressure of 1*10^5 pa, 30dm3 of H2 gas is burned with 30dm3 of O2 gas in a container of 60dm3. Calculate the pressure different after the complete combustion and cooling upto 30degree C again.

**Calculus**

F'(x)=

**Calculus**

Use logarithmic differentiation: F(x)= (3x+6)^4 (x^3 -2)^5

**Chemistry**

NH4NO3 is frequently used as a fertilizer and in explosive compounds dlta Hf values of this compound nd H20 are -365kJmol-1 and -286kJmol-1 respectively. Calculate the amount of heat released bye the dissociation of 1mol of NH4NO3 according to the following reaction 2NH4NO3--&...

**Chemistry**

20cm3 of 0.500moldm-3 H2SO4 was consumed to neutralize 50cm3 of 0.400moldm-3 NaOH. The temperature of the system is increased by 36 degree C. The heat capacity of the calorie meter was 39 JK-1, and the heat capacityof the solution is 4.2JK-1. Find the enthalpy of ...

**Chemistry**

20cm3 of 0.500moldm-3 H2SO4 was consumed to neutralize 50cm3 of 0.400moldm-3 NaOH. The temperature of the system is increased by 36 degree C. The heat capacity of the calorie meter was 39 JK-1, and the heat capacityof the solution is 4.2JK-1. Find the enthalpy of ...

**Chemistry**

20cm3 of 0.500moldm-3 H2SO4 was consumed to neutralize 50cm3 of 0.400moldm-3 NaOH. The temperature of the system is increased by 36 degree C. The heat capacity of the calorie meter was 39 JK-1, and the heat capacity of the solution is 4.2JK-1. Find the enthalpy of ...

**physics**

Cliﬀ divers at Acapulco jump into the sea from a cliﬀ 37.1 m high. At the level of the sea, a rock sticks out a horizontal distance of13.39 m. The acceleration of gravity is 9.8 m/s^2. With what minimum horizontal velocity must the cliﬀ divers leave the ...

**physics**

Bill kicks a rock oﬀ the top of his apartment building. It strikes a window across the street 12 m away. The acceleration of gravity is 9.8 m/s^2. If the window is 16 m below the position where Bill contacted the rock, how long was it in the air?

**Math!!!!!!!!!!!!!!!!!**

OMG please help me .-. (Advanced) Give the domain and range of the relation. x y 2 5 8 17 0 0 –3 –5 Answer a. D: {2, 8, –3, 5, 17, –5}; R: {0} b. D: {–3, 0, 2, 8}; R: {–5, 0, 5, 17} c. D: {–3, 2, 8}; R: {–5, 5, 17} d. D: {–5, 0, 5, ...

**math**

I need help please >(Advanced) Give the domain and range of the relation. x y 2 5 8 17 0 0 –3 –5 Answer a. D: {2, 8, –3, 5, 17, –5}; R: {0} b. D: {–3, 0, 2, 8}; R: {–5, 0, 5, 17} c. D: {–3, 2, 8}; R: {–5, 5, 17} d. D: {–5, 0, 5, ...

**Chemistry**

you would have to use addition. and convert it into a fraction.

**Chemistry**

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 235 torr. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature. What is the mole fraction composition of the mixture?

**English**

Is this grammatically correct? "I can't believe that I'm growing up so fast."

**Math**

300 feet

**Algebra**

Simplify : ((-5xy)^2)^5 I got 9765625x^10y^10 I don't that is correct..

**ELAPSED TIME**

9 hours and 40 minutes

**Physics**

Small spheres of diameter 1.00mm fall through 20 degree Celsius water at a terminal speed of 1.10 cm/s. calculate the density of the spheres.

**History**

"They [Jackson and his supporters] see nothing wrong in the rule that to the victor belong the spoils of the enemy." -William Learned Marcy of the U.S. Senate What did Marcy mean by the "spoils of the enemy"?

**math**

:D

**History**

Fill in the blank. By the 1850s, railroads were beginning to ___________ canals for transporting goods.

**History**

Fill in the blanks. Under the Mississippi compromise, any new states formed west of the Mississippi river and north of the Missouri's southern border line were required to be __________.

**History**

What cause did Webster support throughout his political career?

**Math 8 - help!**

First use y2-y1/x2-x1 -2-6/-1-1 -8/-2 m= 4 use (1,6) m=4 to substitute into the variables y=mx+b 6=4(1)+b 6=4+b 2=b write your equation y=mx+b y=4x+2

**Chemistry**

Thyroxine, an important hormone that controls the rate of metabolism in the body can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution could be measured as 5.144°C. Pure benzene freezes at 5....

**Math**

A large factory knows that if it sells it's new gadgets for $10 each, it can sell 350 per month and if it sells the same gadgets for $8 it will sell 500 per month assuming the relationship between price and sales is linear predict the monthly sales of gadgets to the ...

**Math**

Use a calculator to simplify the expression. 8/2^3-2+4.1*2 When I used the calculator, I got 22.2 So then I used "PEMDAS" but got 7.53333... But the answer is 7.2 can someone help please?

**Earth Science**

1. What are one internal and one external source of energy in the Earth system? 2. Earth scientists assume that the causes of natural events of phenomena can be discovered through... 3. Science constantly creates new technology. Does this new technology always benefit society?

**MATH!!!**

Fist you use the distributive property method. 3(d+12)=8-4d 3d+36=8-4d Subtract 8 from each side 3d+28=-4d Subtract 3d from both sides 28=-7d divide by -7 from each side ?= d

**math**

how much money do i have left from 36p if i spend 1/4 of it

**English**

This sentence has an error but I'm not sure if this is correct. His father and uncle were theirselves great travelers. Is it suppose to be: His father and uncle were themselves great travelers.

**Earth Science**

A. Water

**Earth science**

B. Pressure

**Math**

i don't under stand the word math problem

**Earth science**

Plate tectonics

**MATH**

First, you combine like-terms. 11w-9-7w=15 11w minus 7w is 4w 4w-9=15 add 9 to each side 4w=24 divide each side by 4 w= ?

**Earth Science**

1. What are one internal and one external source of energy in the Earth system? 2. Earth scientists assume that the causes of natural events of phenomena can be discovered through... 3. Science constantly creates new technology. Does this new technology always benefit society?

**MATH HELP!!!!!!**

First, you subtract 4 from both sides, then times 7/2 on each side: 10 = 2/7n+4 14= 2/7n 49=n

**English**

Choose the pronoun that correctly completes each sentence. 1. (who, whom) will the choir director choose? Is it whom?

**Algebra**

A store is selling compact discs for $10.50 and $8.50. You buy 10 discs and spend a total of $93. How many compact discs did you buy for $10.50? $8.50?

**Algebra**

The girl's basketball team scored 57 points and made 25 shots. Each shot was worth 2 or 3 points each. Write a linear system.

**Algebra- Check Please**

A farmer is tracking two wild honey bees in his field. He maps the first bee's path back to the hive on the line y=9/7x. the second bee's bee path follows the line y=-3x+12. Their paths cross at the hive. At what coordinate will the farmer find the hive? I got (-6/7, 6)

**Trigonometry**

Yes I had a typo. Thank you!! (I don't know how to respond to answers besides this....)

**Trigonometry**

Prove that tanx+cotx=2sec(2x) Thank you! :)

**Algebra**

Use the substitution method to solve the linear system. 1/8p+3/4q=7 3/2p-q=4 Thanks.

**Algebra**

Use substitution method to solve the linear system. Can someone please check if I did this problem right? Thanks X+y=12 X+3/2y=3/2 Y=21 x=-9

**algebra**

I have another question. So I solved the problem but then I have to put it in an ordered pair form. If I was using the variables "x and y," then it would be (x,y) but what if I were using different variables, in this case s and t, how do I know which one is the x and...

**algebra**

Use the substitution method to solve the linear system. Thanks! s= t+4 2t+s=19

**social studies**

was the structure effective for its stated purpose

**trig**

2sinxcosx+4sin^2xcos^2x=0 solve for x in radians between [0,2pi) (I mean that it is sine squared x and cosine squared x not sine to the power of 2x or cosine to the power of 2x)

**Math**

When the mean is greater than the median, what does it suggests about the data set?

**English**

Find the plural that has been formed incorrectly. Then write it in its correct plural form. Dad was hoping to catch several bass and trouts for our suppers. I'm not sure if it's "trouts" or "suppers".

**math**

andrea cuts 62 1/2 inches of ribbon into 4 equal hair ribbons. How long was each hair ribbon?

**Algebra**

I don't get how you would know which way to shade the inequality when it's true or false. For example the inequality 2x+3y> 12 When I solve it it's y>-2/3x+4 But when I graph the line how would I know which side to shade?

**Language**

Hi! So I am having a hard time in Chinese class. Paying Attention that is. My teacher lets all the students goof off, and it's hard to pay attention. She doesn't care if we are on our phones, so it's a BIG temptation. I know that if I payed attention in class more...

**Algebra**

I solved the inequality and now I have to graph and shade it in. Y<-5x-6 0<-5x-6 I used the test point 0,0 and substituted in y but how do I know if it's true or false?

**Algebra**

Solve the inequality and graph. 7<1-x<13 I got -6 >x >-12 Is that correct?

**English**

Identify the nouns and verb/verb phrases in the sentence. Employers value honesty and hard work. Nouns: Employers, honesty, and work Verb: Value

**Chemistry**

The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H2SO4 solution (in M)?

**Chemistry**

The temperature rises from 25.00 °C to 29.00 °C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. Calculate ÄErxn for the combustion of sucrose in kJ/mol sucrose. The heat capacity of the calorimeter is 4.90 kJ/°C . The ...

**Chemistry**

How many atoms of carbon are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

**chemistry**

Choose the bidentate ligand from the substances below. A) cyanide ion B) ammonia C) EDTA D) carbon monoxide E) ethylenediamine

**Chemistry**

The complex ion, [Ni(NH3)6]2+, has a maximum absorption near 580 nm. Calculate the crystal field splitting energy (in kJ/mol) for this ion.

**Chemistry**

Which of the following compounds can exhibit cis-trans isomerism? A) [Fe(CO)5ONO]2+ B) [Fe(CO)3(NH3)3]3+ C) [Cu(CO)5Br]+ D) [Cr(H2O)4Br2]+ E) [Fe(NH3)6]2+

**Chemistry**

Determine the volume of H2S (at 375 K and 1.20 atm) needed to produce 55.0 g of S. Assume that there is excess SO2 present. 2 H2S(g) + SO2(g) ¨ 3 S(s) + 2 H2O(g)

**Chemistry**

What element is undergoing oxidation (if any) in the following reaction? CH4(g) + 2 O2(g) ¨ CO2(g) + 2 H2O(g)

**Chemistry**

combustion analysis of 63.8 mg of C,H, and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound?

**RE:ENGLISH QUOTE**

Is there a different way to explain the meaning of the quote?

**RE:ENGLISH QUOTE**

Here is my meaning of Hellen Keller's quote: It means that by using my voice I can do something. I may not be THE one but AT LEAST I AM one. I know that I can't do everything but the thing is, I CAN do SOMETHING. I will do what I can do to make a difference. I don'...

**English**

“I am only one, but still I am one. I cannot do everything, but still I can do something; and because I cannot do everything, I will not refuse to do something that I can do.” Please explain what this quote means, thanks!

**English**

"It is better to lead from behind and to put others in front, especially when you celebrate victory when nice things occur. You take the front line when there is danger. Then people will appreciate your leadership." What does this quote mean?