Questions and answers by

Anna

Questions (1,588)

How much heat energy, in kilojoules, is required to convert 48.0g of ice at −18.0 ∘C to water at 25.0 ∘C ?Please show all
1. 2 answers
2. 3,644 views
A rectangular trough, 2.0 m long, 0.50 m wide, and 0.50 m deep, is completely full of water. One end of the trough has a small
1. 2 answers
2. 1,215 views
Given that many laboratory gases are sold in steel cylinders with a volume of 43.8 L, What mass (in grams) of argon is inside a
1. 1 answer
2. 2,114 views
If 14.5g of CO2 gas has a volume of 0.13L at 305K , what is its pressure in millimeters of mercury?I've plugged these values
1. 2 answers
2. 550 views
Hola Sra. This one is a bit long. I hope they are correct.Part I Los pronombres relativos. Complete las oraciones siguientes en
1. 6 answers
2. 1,569 views
Joe and Susan invested $1500 at Bank of America in 2000, at 4% compounded quarterly. In the year 2005 they moved to another city
1. 1 answer
2. 1,125 views
Barbara invested $12,300 at the Midtown Credit Union at 6% compounded monthly for 7 years. What is the effective rate of this
1. 3 answers
2. 520 views
Which of the following is the largest ethnic group in chinaA.Han B.tibetan C. Uighurs D. Hui Which of the following is the
1. 6 answers
2. 2,761 views
Use bond energy values to estimate delta H fro the following reaction in the gas phase:C2H4 + Br2 -> CH2BrCH2Br I am in dire
1. 1 answer
2. 2,734 views
Hola Sra. Are these correct?La tercera persona plural de pretérito. Cambie las formas entre comillas al pretérito según el
1. 2 answers
2. 1,836 views
The ratio of guys to girls in the classroom is 8:1. There are 45 people in the classroom. How many of them are guys?
1. 1 answer
2. 499 views
determine whether or not the given set forms a basis for the indicated subspace:#1 {1,1,0), (1,1,1)} for the subspace of R^3 of
1. 3 answers
2. 668 views
show that the set of all m-vectors whose first components is 0 (of R^m)
1. 0 answers
2. 428 views
What is the molarity of a solution prepared by dissolving 820. g of sodium phosphate, Na3PO4, in water and diluting to 2.89
1. 1 answer
2. 614 views
Sra. do these look correct?¿Cuánto tiempo hace que…? Conteste las preguntas utilizando frases completas en español. 1)
1. 2 answers
2. 1,527 views
A salt may be prepared by the reaction of one salt with another salt, particularly if one of the products is insoluble.In which
1. 1 answer
2. 708 views
A salt may be prepared by the reaction of one salt with another salt, particularly if one of the products is insoluble.In which
1. 4 answers
2. 760 views
Sra. do my answers look correct?Querida Abby… Complete el párrafo abajo por escoger una palabra lógica de la lista siguiente
1. 2 answers
2. 1,853 views
Rank the following elements by electron affinity, from most positive to most negative EA value:tellurium, bismuth, neon, sodium,
1. 3 answers
2. 8,770 views
K(s)+NH3(g)→ ?
1. 1 answer
2. 457 views
Cloves contain two principal essential oils, caryophyllene and eugenol. A student carrying out a steam distillation using cloves
1. 1 answer
2. 2,226 views
Limone (MW 136g/mol) is a pleasant smelling liquid found in lemon and orange peels. The boiling point of limonene is 175 ˚C,
1. 2 answers
2. 1,915 views
Aniline (MW93 g/mol) co-distills with water 98.2 C. The vapor pressure of water at 98.2 C is 717 mmHg. You need to isolate 10 g
1. 1 answer
2. 2,138 views
A meteorological balloon contains 237. L of helium at 33. °C and 0.832 atm.If the volume of the balloon can vary according to
1. 1 answer
2. 552 views
Suppose 55.3 L of a gas is at a temperature of -73. °C.If its temperature is increased to 411. °C, what will its volume be
1. 2 answers
2. 900 views
Hola Sra ¡Feliz Halloween! Do my answers look right?Part I ¿Ingestión o intoxicación? Traduzca la conversación siguiente al
1. 4 answers
2. 1,022 views
Sra. are these three correct? I have a short assignment this week. Thank you!Conteste las preguntas utilizando el
1. 2 answers
2. 1,463 views
How would you prepare 165 mL of a 0.976 M NaOH solution, starting with a 6.36 M stock solution?Volume of solution needed? Volume
1. 1 answer
2. 565 views
I don't understand how to find the equation to solve this.A family drove two cars to a reunion. The first car traveled at 50
1. 1 answer
2. 690 views
has inherited $15,000 that she wants to invest in two separate accounts, one paying 4%and one paying 3% annual interest. If the
1. 1 answer
2. 639 views
Sra. this week I had a review. Do my answers look correct?Part I Indique si las palabras en pares son sinónimos, antónimos, o
1. 4 answers
2. 1,841 views
Solve for x in each of the following:A: 2/3 = x/18 B: 3/x = 3x/x^2 I think I have the first one. I am clueless on the second
1. 3 answers
2. 422 views
A compound containing boron and hydrogen has been synthesized. You perform two experiments to determine the molecular formula of
1. 1 answer
2. 1,272 views
A man threw a ball horizontally out of an elevator that was traveling upward at a rate of 5.50m/s. If the ball was thrown at a
1. 1 answer
2. 601 views
Determine whether the fractions in each of the following pairs are equal:a: a^2/b and a^2b/b^2 b: 377/400 and 378/401 c: 0/10
1. 1 answer
2. 479 views
Sra. do these look correct?Part I Entonces, complete el diálogo telefónico en una manera lógica utilizando oraciones
1. 3 answers
2. 1,996 views
what heading must a pilot fly to compensate for a 125km/h west wind to have a ground track that is due south? The airecraft
1. 1 answer
2. 1,348 views
1.) Suppose that y varies directly as x. If y is 5 when x is 30, the constant of variation is 150. True Or False2.) If w varies
1. 1 answer
2. 1,804 views
Sra. are my answers correct? Thank you so much for your time.Part I El condicional. Llene el espacio con la forma condicional
1. 4 answers
2. 1,474 views
if jerry bought 6 shoes for 85 dollars, how much would fred have to pay for 17 pairs at the same rate?
1. 1 answer
2. 398 views
Sra. would you look over my answers please?Part I. El subjuntivo con expresiones hipotéticas: Complete las frases siguientes
1. 2 answers
2. 1,809 views
any number that can be expressed as the ratio of 2 integers a/b, where b does not equal 0, is a rational number
1. 1 answer
2. 1,094 views
Would it be possible to have Sra double check my answers? She was such a huge help last semester.Part I ¿Subjuntivo o
1. 4 answers
2. 1,695 views
Nickel is about 2 millimeter thick or 2/1000 of a meter.how many nanometer is this?
1. 6 answers
2. 789 views
I could really use some help with this problem because I'm pretty confused on what to do.The formula for the volume of a cone is
1. 1 answer
2. 611 views
I could really use some help with this problem because I'm pretty confused on what to do.The formula for the volume of a cone is
1. 1 answer
2. 574 views
Please help me I beg of you! My math teacher is awful and I have no idea how to do my pretest and she's picky about showing my
1. 4 answers
2. 655 views
The air temperature is -10 degree Celsius. With the wind blowing at a speed of 15 km/h, this temperate feels like -17 degrees
1. 4 answers
2. 830 views
The air temperature is -10 degree Celsius. With the wind blowing at a speed of 15 km/h, this temperate feels like -17 degrees
1. 2 answers
2. 804 views
A tank is filling with water from a natural spring. Two days ago the water was 10 feet deep, and yesterday the water was 12 feet
1. 1 answer
2. 529 views
The least common multiple of two numbersIs 60 , and one of the numbers is 7 less than The other number. What are the numbers
1. 2 answers
2. 1,143 views
Identify each data source as primary or secondary. State one advantage or each source of data.a) A researcher interviewed 10
1. 1 answer
2. 788 views
Identify each data source as primary or secondary. State one advantage or each source of data.a) A researcher interviewed 10
1. 2 answers
2. 806 views
If 175 grams of CsCl in 100 grams of water at a temperature of 100C will it be saturated or unsaturated?
1. 1 answer
2. 1,382 views
6 out of 20 apples were rotten what percentage of the apples were rotten
1. 3 answers
2. 1,024 views
The melting point of substance X is -20 degrees Celsius and the boiling point is 90 degrees Celsius. How many Celsius degrees
1. 1 answer
2. 1,303 views
A 0.4 kilogram sample of Aluminum at 115 degrees Celsius is put into a container containing 0.5 kilograms of water at 15 degrees
1. 1 answer
2. 2,078 views
Two Kids pull opposite directions on a toy with a mass of 18kg. One exerts a force of 695N and the other 135N. Both pull
1. 1 answer
2. 1,057 views
5 x 3^n(This is all i have for the question but i don't know how to solve it)
1. 3 answers
2. 632 views
Use the function rule f(x) = x × |-1|^x. Find the output f(2)
1. 4 answers
2. 893 views
Sra. do my answers look correct?Part I Los mandatos en contexto. Escoge el mandato apropiado. Pon atención al contexto para
1. 2 answers
2. 2,076 views
Someone in a car going past you at the speed of 24 m/s drops a small rock from a height of 1.6 m.How far from the point of the
1. 1 answer
2. 1,369 views
Hola Sra. Do these look ok?Part I ¿Conoces esta foto? 1. Es una vista del interior de la Mezquita de Córdoba. Tomando en
1. 3 answers
2. 1,605 views
Sra do theses look correct?Part I ¿Por o Para? Complete each statement correctly by choosing either POR or PARA. 1. Sacar
1. 6 answers
2. 2,286 views
put in order this fractions 9/9, 2/3, 5/6, 4/12, 0/2 from the smallest to the largest? I don't know how?
1. 3 answers
2. 657 views
Sra. will you please check my answers? Thank you so much!1. Rewrite the following text in the imperfect indicative. Una vez al
1. 4 answers
2. 1,458 views
In January 2012, one US dollar was worth 50.0 Indian rupees. Suppose that over the next year the value of the Indian rupee
1. 0 answers
2. 866 views
Can someone help me answer some questions.Homes near warm climate get a) colder winters b)warmer winters c) cold and warm
1. 1 answer
2. 537 views
Pedro built nine bicycles in 25 h. At this rate, how many bicycles will he build in a 40 h week.
1. 4 answers
2. 1,485 views
Sra. are my answers correct? Thank you!Part I ¿Subjuntivo, indicativo o infinitivo? Choose the correct verb form to complete
1. 7 answers
2. 1,920 views
Sra,Are my answers correct? Thank you. Complete the following sentences using the subjunctive 1. Dudamos que ellos… Dudamos
1. 5 answers
2. 1,522 views
Sra. can you please correct my answers? I am so grateful for your help!Part I Answer the questions using the "PRESENT
1. 3 answers
2. 1,288 views
My teacher gave a bunch of words to define, and the word, Second hand pill is one of them. What does second hand pill mean ?
1. 1 answer
2. 617 views
The price of gas is 85.9 cents per Litre. If Brenda needs 48.3 L of gas to fill her gas tank, how much will she pay?Please show
1. 6 answers
2. 2,390 views
If a 1.60 M sample of A is heated to 500 K, what is the concentration of B at equilibrium?A(aq)<---> 2B(aq) Kc=9.63x10^-6
1. 1 answer
2. 821 views
Are my answers correct?Parte I: Conteste las preguntas en frases completas en español 1. ¿Qué significan las palabras te y
1. 4 answers
2. 2,095 views
ystic fibrosis is caused by mutations in the CFTR gene, which encodes for a chloride channel. You are studying cystic fibrosis
1. 1 answer
2. 638 views
explain how a microclimate can affect crop productionI need someone to explain this to me because i don't get it
1. 3 answers
2. 2,520 views
Describe how a large water body can affect the amount of snowfall a region receives in the winter.?
1. 2 answers
2. 1,382 views
How do endotherms and ectotherms differ?a) Endotherms are warm-blooded and ectotherms are cold-blooded. b) Endotherms and
1. 0 answers
2. 885 views
Select the correct statement describing feedback control in animals.Select the correct statement describing feedback control in
1. 2 answers
2. 1,644 views
Each square represents 625 square feet, each line segment represents 25 feet.A galapagos tortoise must use 550 feet of fencing
1. 2 answers
2. 535 views
Are my answers correct? I had the most trouble with the accents in part II. Thank you.Part I Llene los espacios en blanco con la
1. 2 answers
2. 2,110 views
For the reaction:2H^+(aq)+Zn(s)----->He2(g)+Zn^2+(aq) a) Write the reduction half-reaction b) Write the oxidation half-reaction
1. 1 answer
2. 911 views
After a completely inelastic collision, two objects of the same mass and same initial speed are found to move away together at
1. 1 answer
2. 743 views
Am I correct?I. Conteste las preguntas utilizando mandatos formales. Trate de usar pronombres cuando posible. 1. ¿Es necesario
1. 3 answers
2. 1,282 views
The Heisenberg Uncertainty Principle:A student is examining a bacterium under the microscope. The E. coli bacterial cell has a
1. 0 answers
2. 791 views
The Heisenberg Uncertainty Principle:A student is examining a bacterium under the microscope. The E. coli bacterial cell has a
1. 0 answers
2. 932 views
The Heisenberg Uncertainty Principle:A student is examining a bacterium under the microscope. The E. coli bacterial cell has a
1. 0 answers
2. 962 views
Let (7,-3) be a point on the terminal side of theta. Find the exact values of cos of theta, sec of theta and cot of theta?
1. 1 answer
2. 9,103 views
9. Which of the following sentences contains a comma splice?A. Our friend, who travelled from Tennessee, was quite tired when he
1. 1 answer
2. 535 views
This is a problem I got on my Mastering Chemistry homework:Consider the following reaction: H2(g)+I2(g)⇌2HI(g) A reaction
1. 3 answers
2. 4,590 views
A man wishes to cross a river from A to B, a distance of 800m. He can row at 8km per hour, in what direction should he head the
1. 1 answer
2. 694 views
What is the definition for "Practical problems" and "Ethical problems"
1. 1 answer
2. 646 views
how much should rod pay for a 10 year annuity that provides month end payments of 1800 at 4.5% compounded quarterly
1. 1 answer
2. 414 views
95.0mL of H2O is initially at room temperature (22.0∘C ). A chilled steel rod at 2.0∘C is placed in the water. If the final
1. 2 answers
2. 1,839 views
A calorimeter contains 32.0mL of water at 13.0∘C . When 2.30g of X (a substance with a molar mass of 82.0g/mol is added, it
1. 1 answer
2. 1,343 views
95.0mLmL of H2O\rm H_2O is initially at room temperature (22.0∘C\rm{} ^{\circ}C). A chilled steel rod at 2.0∘C\rm ^{\circ}C
1. 2 answers
2. 1,445 views
Consider the following problem:Target: 2NOCl(g) ? N2(g)+ O2(g)+Cl2 (g) ?Hrxn= ? Steps: 1. 1/2 N2(g) + 1/2 O2(g)? NO(g) ?H= 90.3
1. 0 answers
2. 673 views
Calculate the DHof for the following reaction under standard state conditions:2 Ag2S(s) + 2 H2O(l) ---> 4 Ag(s) + 2 H2S(g) +
1. 0 answers
2. 631 views