Posts by J
Total # Posts: 1,017
joules needed to melt 30.0 g of ice at 0 ∘C and to warm the liquid to 60.0 ∘C so i did Q=mFf which i set up like 30.g x 334 j/c = 10020 J then i'm sorta confused what i'm doing next. explain in detail please?
@Ms.Sue how are you going to say that when i see you everywhere giving your "students" the answers
How does recycling influence culture
READING ASAP ASAP PLEASE HELP ME!!!!!!!!!!!!!!!!!!
the girl that has no friends is tottaly right
i believe it is C.
according to the triangle inequality, the length of the longest side of a triangle bust be less than the sum of the lengths of the other two sides. the two shortest sides of a triangle measure 3/10 and x + 1/5 and the longest measures 3/2x. write an inequality that uses the ...
critically evaluate this statement 'an international retailers preferred market entry method directly affects its market Selection decisions
If it takes a lawn company 5 hours to cut 6 lawns, how many yards can be cut in 12.5 hours?
Child Development and Human Behavior
. Which of the following factors helps a child develop a positive self-concept? A. Material wealth B. The sex of the child C. Family relationships D. Conflicts with teachers
@Reed I think #1 would be A, #3 would be C, and #2 would be B. Am I correct now?
Please check my answers! 1. The Nineteenth Amendment granted women the right to vote, but women had been fighting for years for this right. Before the Nineteenth Amendment was passed, which existing amendment could women have used to argue that they should have the right to ...
If you want to prepare 2.0 liters of a .25 M solution of NH4Cl, how many grams of the salt should you weigh out?
Assume you have prepared 100.0 mL of a buffer solution using 0.400 mol of acetic acid (pKa = 4.74) and 0.400 mol of sodium acetate. The pH of this buffer solution is initially 4.74. After preparing this buffer solution, you added 55.0 mL of a 1.10 M NaOH solution to your ...
A chemist needs to prepare a buffer using the carbonate system (information in the table in the previous quetion) with a final pH of 10. Which components should they mix in water to product this buffer? Question options: H2CO3 HCO3- CO32-
A chemist needs to prepare a buffer using the carbonate system (information in the table below) with a final pH of 6. Which components should they mix in water to product this buffer? H2CO3 HCO3- CO32- pKa 6.35 10.33 N/A
The pH of a buffer can be predicted using the Hendersen-Hasselbach equation: pH=pKa+ log([conjugate base][conjugate acid]) The choice of the conjugate acid-base pair (as you did in the previous questions) determines the pKa value to be used in the H-H equation. By varying the ...
Help Math PLZ
deez nuts is right! 10/10!
A 6.90-g sample of solid NiSO4·6H2O was heated such that the water turned to steam and was driven off. Assuming ideal behavior, what volume would that steam occupy at 1.00 atm and 100.0 °C?
Solve in radians. 1) sin2X = 1/2 2) tan2 (X + pi/2) = 1 3) 5 - 3sec (X - pi/4) = -1
A boat moving at 5 mi/h is to cross a river in which the current is flowing at 3 mi/h. In what direction should the boat head to reach a point on the other bank of the river directly opposite the starting point?
What is greaterthan 40 and less than7 tens
I need help to did anyone answer this
no it is true not false
Some people in a hotel are dropping water balloons from their window onto the ground below. The balloons take .15s to pass your 1.6m tall window. Where should security look for the raucous guest? Express your answer using tow significant figures.
On successive plays, the home football team gains 12 yd, loses 3 yd, loses 5 yd, gains 15 yd and runs 16 yd for a touchdown. What is the average gain or loss in yards per play?
The half-life of the Nobelium isotope No^257 is about 23 seconds. 644 seconds (or 28 half-life periods) after the isotope was released there were 20 grams remaining. The number of grans of No^257 after h half life periods is M= 20 * (1/2)^h where h = 0 corresponds to 644 ...
Maria shares a house with 4 others. She pays $500 rent per month plus her utilities. If the utilities cost a total of x dollars, how much more money,M, does maria owe Write an equation for how much maria owes.
The standard deviation of a sample taken from population A is 17.6 for a sample of 25. The standard deviation of a sample taken from population B is 21.2 for a sample of 30. The standard deviation of the sample mean differences is_____. (Round your answer to the nearest ...
the volume for this question is 1 tsp. still not sure how to solve it.
50cm3 of hydrogen is collected over water at 17 degree celsius and 750 mm Hg pressure.Calculate the volume of dry gas at S.T.P.The water vapour pressure at 17 degree celsius is 14 mm Hg?
Algebra please help
do your own work, i only come here check work!
Art and Creative Development
Art helps children socially because: A. they can make artistic products for others to see at art shows B. during are activities, they interact and learn social skills such as sharing and taking turns. C. they can make crafts that can be sold to other people. D. children cannot...
Art and Creative Development
Young children who learn easily, ask thought-provoking questions, and are very curious are often: A. gifted or talented B. behavior problems in the classroom C. poor at following directions D. overly shy and withdrawn socially i think it is between a and d but i am not sure
two charges of equal magnitude are 25.5 cm apart if the force between the charges is 155 N what is the magnitude of the charges
Sam has 18 coins in his pocket that are either quarters or nickels. The total value of these coins is $3.90. Let q represent the number of quarters and n represent the number of nickels. The following system of equations represents this situation: q+n=18 0.25q+0.05n=3.90 How ...
A community group bought 25 tickets to a play. Adult tickets cost $30 each and student tickets cost $20 each. In all, the group spent $620 on the tickets. Determine if each equation is a part of the system of equations that can be used to find the number of each type of ticket...
amy and anonymous are right 100% baby!
Describe the difference between saying that two segments are congruent and saying that two segments have equal length. When would you use each phrase?
Explain the impact of the Japanese attack on Pearl Harbor.
find the weight of a person with a mass of 68.0kg
1. a is wrong it was b
Radiometric (Radioactive) Dating
How old is a sample that contains 125 atoms of U-235 and 375 atoms of Pb-207? ...Given that the half life values on my handout are 713 million years. *I do not even know where to start so could you please explain in steps too? Thanks.
Sam wants to invest the same amount at the end of every 3 months so that he will have 4000 in 3 years. The account will pay 6% compounded quarterly. How much should he deposit each quarter.
A young couple saves for a down payment on a house by depositing $100 each month into an annuity that pays a 4.8% annual rate. Find the amount in the annuity at the end of 2 years.
english grade 8
winter wonder land is right
420 people is t
6 is right
yes that is right
Math!! Help ASAP
this stuff is so easy you guys should know this stuff!
An electron has an uncertainty in its position of 507pm. What is the uncertainty in its velocity?
Thanks, just got a 100%!!!
High School Algebra II
This website doesn't allow links so I had to be creative, i'm sorry. The link is h t t p://imgur. com/a/ZxWLk If you just remove the spaces, you can access the link.
High School Algebra II
Hey friends, I have a big assignment I've been given that I really, really could use an 100% on. I've been working on it for hours and have a decent amount done, have had teacher help, and have had friends work with me on it, but I still need help. If anyone has any ...
c it is c
yes it is
By the way, thanks Ashley!
I think Ms. Sue is just jealous because she didn't answer it all right.
those answers are wrong i got a 66.7%
mr. bacon is right
At 29.6 degrees C, pure water has a vapor pressure of 31.1 torr. A solution is prepared by adding 86.7 g of "L" a nonvolatile nonelectrolyte to 390.0 g of water. The vapor pressure of the resulting solution is 27.6 torr. Calculate the molar mass of "L"
midnight was right thanks
they are all wrong the real anwsers are bbcab
Produce a 99.9 % confidence interval for the population mean body temperature of a healthy male. Then do the same for the population of healthy females. Round your answers to three decimal places.
danny is right
ART HAVING HARD TIME
Mwah! Thanks, got 100%
United states history
A stock has a beta of 2.0. A security analyst who specializes in studying this stock expects its return to be 24%. Suppose the risk-free rate is 6 percent and the market-risk premium is 10 percent. Is the stock overvalued or undervalued relative to the markets ...
I need help with my math pizzazz worksheet page 167 1.3x-5y=13 X-2y=5 2.7x-2y=-1 3x-4y=19 3.2x+3y=7 3x+4y=10
to conduct a scientific experiment, students need to mix 90 millimeters of a 3% acid solution. They have a 1% solution and a 10% solution available. How many millimeters of a 1% solution and of the 10% solution should be coming to produce 90 millimeters of the 3% solution .01x...
A) if you added 8g of ammonium nitrate to 25mL of room temperature water, what would be the temperature in °C?
The illumination of an object by a light source is directly proportional to the strength of the source and inversely proportional to the square of the distance from the source. If two light sources, one 10 times as strong as the other, are placed 9 ft apart, how many feet from...
Fins nance business
1. Find the future value of current $1,000 5 year from now when annual interest rate 8% is compounded annually 2. Find the present value of a future value (1,000) four years from now when annual interest rate 8% is compounded quarterly. 3.Find the present value of a four year...
The standard free energy change, ΔG∘, and the equilibrium constant K for a reaction can be related by the following equation: ΔG∘=−RTlnK where T is the Kelvin temperature and R is equal to 8.314 J/(mol⋅K). Calculate the equilibrium constant ...
Freed of assembly and press is basically like the News or the newspaper. It give the people the freedom to public current issue and information going on without being at risk of going to jail or killed.
6.35555 Meters tall?
Let's say for example I have 5g of copper in a beaker. Mass would be 5g + mass of beaker. If I add any given amount of water to the beaker containing the copper, that will change the mass of the beaker containing the copper. Am I correct so far? So then if I pour out the ...
Does one mole of copper have the same mass as one mole of iron? Explain. - I say no since: 1 mol Cu = 63.55g/mol 1 mol Fe = 55.85g/mol So 1 mol of copper is 63.55g, while 1 mol of iron is 55.85g. So they have a different mass because their molar masses are different, right?
I am not exactly sure but... Since there is a 30% chance that he will have to stop at the first light, there is a 70% chance that he won't. And since there is an 80% chance he will have to stop at the second light, there is a 20% chance he won't. So I subtracted -> ...
I think the answer is C) 50%
50 cups each*
- Convert 25 L into 25000 mL - Let x be the unknown number of cups. - You will be able to find the number of cups with the equation: 200x +300x = 25000 500x = 25000 x = 50 The class sold 50 cups of orange juice.
So the number of moles on the left side would have to equal the number of moles on the right side of the equation? And does this apply for the total number of moles on one side, or just the number of moles of one element on one side?
Is the number of moles of an element reacted equal to the number of moles of an element produced? -Let's say for example, 5g of copper. So the molar mass of copper (according to my textbook in which I need to use those numbers) is 63.55g/mol So 5g / 63.55g/mol = 0.08mol So...
The answer that you provided is in fact incorrect. The H2+CsOH on the right side of the equation contains 3 hydrogen atoms. However, you only have 2 hydrogen atoms on the left side of the equation. Therefore, your equation is unbalanced. Keep trying!