# Posts by hannah

Total # Posts: 3,334

**Chemistry**

How would I balance the following redox equation? I know the Charge on the Br is 5, but i am comfused on where to go from there. H20 + Br^- + Al^3+ -> Al + BrO3^- + H^+ Thank you so much in advance

**Trig **

cotxcosx/csc^2x-1 Please help me verify

**Trig**

Please help using identities (2tan30)/(1-tan^2 30)

**Trig **

Please help me to simplify using identities 1+tan^2x/tan^2x I don't really understand how to do please help

**Physical Science**

If you know the rate of movement along a fault, the amount of offset over a period of time can be calculated. The basic relationship is Rate = distance/time Movement along the San Andreas Fault is about 3.5 cm/yr. If a fence were built across the fault in 2005, how far apart ...

**Physical Science**

If the mid-Atlantic Ocean is spreading at 2.4 cm per year, how many years has it taken for it to reach its present width of about 5000 km?

**math**

Marla has $95.50 in her savings account. She deposits $5 every week. Her mother also deposits $20 into the account every time Marla washes the car. Her savings account balance can be shown with the following expression: 20c + 5w + 95.50 Part A: Identify a coefficient, a ...

**Precal **

2sin^2(2/A)+cosA=1 Please help me verify using identities

**Math**

If there are 12 green pencils, 4 red pencils, 7 blue pencils, and 2 black pencils, what is the chance of picking a red pencil at random?

**chemISTRY**

A hot lump of 33.2 g of copper at an initial temperature of 70.5 °C is placed in 50.0 mL of H2O initially at 25.0 °C and allowed to reach thermal equilibrium. What is the final temperature of the copper and water given that the specific heat of copper is 0.385 J/(g&...

**Chemistry 2202**

Henry uses 0.150L of 0.500 mol/L NaOH to neutralize 250.0 mL of the hydrochloric acid. What is the concentration of the HCl (aq)?

**Social studies**

Please does anyone have the answers I need help with this

**chemISTRY**

What is the rms speed of N2 molecules at 281 K? What is the rms speed of He atoms at 281 K? where R=8.314

**CHEMISTRY**

If He(g) has an average kinetic energy of 4190 J/mol under certain conditions, what is the root mean square speed of Cl2(g) molecules under the same conditions?

**chemISTRY**

Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simultaneously. After a certain amount of time, it was found that 5.36 mL of O2 had passed through the membrane, but only 3.60 mL of of the unknown gas had ...

**Physical Science**

Find the hydroxide-ion concentration in an aqueous solution when the hydronium-ion concentration is 1×10^?10M. Recall that 10^a×10^b=10^(a+b). Express your answer to one significant figure and include the appropriate units.

**Physical Science**

Find a hydroxide-ion concentration in an aqueous solution having a pH of 2. Express your answer using one significant figures. I thought the answer was 1*10^-2, but I have no clue what I am doing wrong.

**Math**

Ann started reading at 4:00 PM and finished at 4:20 PM through what fraction of a circle did the minute hand turn

**Physics**

A block of ice of mass 30 kg is at rest atop an inclined plane of vertical height 2 m. It is released and slides down the inclined plane. What is its speed at the bottom of the inclined plane?

**Math**

Georgia has 5 yards of ribbon. She needs 1/3 yard to make one bow. How many bows can Georgia make?

**HISTORY (Korean War)**

Was the Korean War a result from existing economic and political struggles? Could it have been a proxy war that involved World powers? Ideas on how I could answer this question would be helpful. Thanks!

**CHEMISTRY**

Determine the concentrations of Na2CO3, Na , and CO32– in a solution prepared by dissolving 2.22 × 10–4 g Na2CO3 in 2.25 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts per million...

**Math**

Kenny will invest $16,000 in an account with an annual interest rate of 5% and the interest is compounded quarterly. How much money will be in the account in 7 years? How will I set this up?

**Math**

Dave uses 500 milliliters of juice for a punch recipe. He mixes it with two liters of ginger ale. How many milliliters of punch does he make?

**Physical Science**

Like water, hydrogen fluoride, HF, and ammonia, NH3, have relatively high boiling points. Explain. A.The polar molecules of each of these materials have relatively strong attractions for themselves, which translates to relatively high boiling points. B. Since these molecules ...

**Physical Science**

If an element has a +1 positive charge and the following chemical symbol, how many electrons does it have? 17 on top, 6 on bottom, Oxygen (O) A. 7 B. 17 C. 5 D. 18

**Physical Science**

Thank you!!

**Physical Science**

Why is metal shiny? A. The electrons absorb each light wave. B. The loose electrons reflect most wavelengths of light. C. The electrons emit light due to electronic excitation. D. The electrons transmit most wavelengths of light. (I think the answer is B, but I am not positive)

**Math123**

The standard distance between studs in a house is 1.5 feet. If you have blueprints for the house that marks every 1.5 feet with 1 inch, how many inches long will a 45 foot wall be represented by?

**Physics **

When Reggie stepped up to the plate and hit a 0.150-kg fast ball traveling at 36.0 m/s, the impact caused the ball to leave his bat with a velocity of 45.0 m/s in the opposite direction. a. If the impact lasted for 0.002 s, what force did Reggie exert on the baseball? b. ...

**Geometry**

How would I divided it up into a rectangle and triangle can you please show me how?

**Geometry **

PLZZZZZ HELP I SUCK AT GEOMETRY Find the area of the following shape. You must show all work to receive credit. Figure ABCDEF is shown. A is located at negative 2, 6. B is located at negative 5, 2. C is located at negative 2, negative 3. D is located at 4, negative 3. E is ...

**Math (Algebra 2)**

What is the probability of choosing an H or a vowel? Honorable is the word. This is how I answered it Its mutually exclusive because of the key word "or" which is the Union. P(H)+P(Vowel)=1/9+4/9 Answer is 5/9 did I solve this right? Thanks

**Math**

What two numbers the exact answer is between 3x567 6x7,381 4x94 8x684

**Math **

How do you find two numbers the exact answer is between

**Math **

A carpenter has a board that is 8 feet long. He cuts off to pieces. One piece is three and a half feet long and the other is 2 1/3 feet long. How much of the board is left?

**Physical Science**

Rank from largest to smallest atomic radius. To rank items as equivalent, overlap them. O, S, Se, Po, Te

**Math (Algebra 2)**

Determine the required number of branches in the tree diagram described. A tree diagram showing how many ways a nickel, a regular die, and a quarter could be flipped. I did a tree diagram with the die having six branches, the nickel having two, and the dime having two. So, I ...

**Math**

Thank You!!!!!!!!

**Math**

I think that answer is actually 42?

**Math**

Determine the required number of branches in the tree diagram described. A tree diagram showing how many ways a nickel, a regular die, and a quarter could be flipped. I did a tree diagram with the die having six branches, the nickel having two, and the dime having two. So, I ...

**Language Arts**

I am doing an essay question, and I just wondered if someone would answer a simple question, of wether they think that the story "Marriage is a private affair" shows external conflict. I beleive it does because external conflict is physical, and comes from other ...

**Language Arts**

22. C 24. B 27. D

**Language Arts**

I just have 3 questions I need help on! Here they are! 22. Read the following lines from “Africa.” Africa my Africa Africa of proud warriors in ancestral savannahs Africa of whom my grandmother sings On the banks of the distant river I have never known you But your ...

**Language Arts**

Can I post my three other questions here? Or should I make a new post>

**Language Arts**

OK........My second answer would be correct then.

**Language Arts**

So man vs man. May I post my last 3 questions I am confused about?

**Language Arts**

I and she are two different people, so it must not be correct?

**Language Arts**

I is Helen. And she is a girl, her name starts with m, she usually has her hair braided and coiled around her head.

**Language Arts**

OK, the choices for 8 are: A. Gloomy and unhappy B. Dark and foreboding*** C. Weathered and stingy D. Prompt and meticulous. Choices for 9 are: A. Tragic irony B. Verbal irony C. Dramatic irony D. Situational irony*** Choices for 13 are: A. Man vs. Man B. Man vs. Nature C. Man...

**Language Arts**

Oh, I am so sorry, I thought i did......Give me one second and I will post them.

**Language Arts**

I have a few questions I need help with; I have more, but I can wait on those ones. 8. Read the following sentences from “First Confession.” Then, to crown my misfortunes, I had to make my first confession and Communion. It was an old woman called Ryan who prepared ...

**Geometry**

An exterior angle of an isosceles triangle has measure 150°. Find two possible sets of measures for the angles of the triangle. If the exterior angle of the bases is 150°?, then the measure of the angle of each base is _° and the measure of the vertex is _°. If...

**English**

I need 3 important quotes from the book Iqbal by francesso d'adamo I found one which is about Iqbal Masib who ran away from the Carpet Factory. I need 2 more but I can't find any. Can you please help me?

**Language Arts**

OK, I will. :)

**Language Arts**

When I write too much in one time, I get confused.

**Language Arts**

I don't want to post all at once one material, and I like to call myself different names, why was there something wrong with that? I am new at this. :(

**Langugae Arts**

Thx. :)

**Langugae Arts**

11. Read the following sentence from “The Balek Scales.” My grandfather was the first person bold enough to test the justice of the Baleks, the family who lived in the chateau and drove two carriages, who always maintained one boy from the village while he studied ...

**physics**

A Syringe is filled with a solution of viscosity n=1.75x10^-3 pa s. The plunger of syringe has cross sectional area 9 x 10^-5 m^2. The needle has length 30mm and internal radius 3 x 10^-4 m. Intravenous pressure in patient is 2.0 kPa. What force must be applied to plunger of ...

**Language arts(Anyone) (connexus)**

Can you guys help me with that quiz?

**math**

What is a 15% tip on a meal that costs $38.40

**Environmental Science please help**

All your answers are right except for " oxygen is passed from one living form to another through each throphic level of the food chain" that is actually false.

**math**

Tanya and Greg are going skiing. Tanya is a seasoned skier while Greg is a novice, he only skied once before. They have a map that provides the coordinates for the top and bottom of each path. Tanya wants to ski the most challenging path while Greg wants to start off with an ...

**math**

3.5 and 3.6 .. gotcha!

**math**

2.9 ft., 3 ½ ft., 3.55 ft., 11/3 ft., 4.1 ft. <--- ? 2.9 ft. 3.55 ft., 3 ½ ft., 11/3 ft., 4.1 ft.

**math**

There are five different sizes of wood planks used to build a deck. Before starting the project you must compare them and put them in ascending order. 3 ½ ft. 11/3 ft. 3.55 ft. 2.9 ft. 4.1 ft. Help plz.

**American Government**

R, could you help me with a few questions for Language Arts?

**math**

laura works at a local supermarket. she can stack 7 shelves in 1\3 of an hour. At this rate, how many shelves can she stack in 2 hours

**Math**

_ _ x _ _____ _ _ +_ _ ______ _ _ You can only use numbers 1-9 and each can be used once.

**Chemistry**

How many mL of acetone are required to make a 8.42 % v/v aqueous solution in a 300 mL volumetric flask?

**plz..chemistry help**

One mole of solid NH4Cl (s) isvheated in a closed box to decompose it partially according to the following reaction: NH4Cl (s) <=> NH3 (g) +HCl (g) A) calculate Kp of the above system at the temperature of the experiment if the partial pressure of ammonia at ...

**chemistry**

One mole of solid NH4Cl (s) isvheated in a closed box to decompose it partially according to the following reaction: NH4Cl (s) <=> NH3 (g) +HCl (g) A) calculate Kp of the above system at the temperature of the experiment if the partial pressure of ammonia at equilibrium ...

**American Government**

6. A. 7. D. 8. A. 9. B. 10. C.

**American Government**

6. What is the only official role of the vice president? A. Lead the national committee on the president's party. B. Organize presidential commissions. C. Preside over the Senate. D. Vote in case of a tie in the Supreme Court. 7. What best describes a faithless elector? A...

**geometry**

If m AOB = m COD = 90 ,find m COB + m AOD.

**Physics**

The work function for a particular metal is 2.18 eV. What is the kinetic energy in eV of photoelectrons ejected when 410 nm violet light falls on this metal?

**Algebra 1**

C B C B

**Algebra 1**

No, why would I guess......

**Algebra 1**

I am so sorry, I forgot. 1. A 2. C 3. B 4. A

**Algebra 1**

1. A family is building a circular fountain in the backyard. The yard is rectangular and measures 14x by 19x and the fountain is going to be circular with a radius of 6x. Once the fountain is built, what will be the area of the remaining yard. A. 230πx^2 B. 230x^2 C. 266x...

**Math**

What does the variable n mean

**Basic Chemistry**

A 150L water heater is set to a cutoff temperature of 49 degrees C and that the incoming water is at 298K, calculate the energy in kJ needed to get this 150L water to it's maximum temperature. Please help!

**science**

One proposed project to help restore Louisiana's wetlands is to backfill canals that were built for access to and transportation of oil from the coastal area. why might scientists first want to build and study a model of their proposed project? Help!!

**World History**

How did China become a feudal state under the Zhou? A.The Shang shared regional power over lands with the Zhou. B.Warlords overran regions and set up their own kingdoms.* C.The Zhou awarded control over lands to their supporters. D.Groups of regional villages requested Zhou ...

**Math**

You roll two fair dice. Let E be the event that an even total shows on the dice. Let F be the event that a three shows on at least one die. Find P(F) and P(F∣E).

**Science**

A transformer has 60 turns in the primary and 1200 turns in secondary.if the primary voltage is 500 V what will be the secondary voltage be? What will the current be if the primary if the secondary carries 2.0 A

**Math**

Divide Rs 5000 in the ratio 2:3:5

**algebra**

What is the quotient and remainder of 4x^3-2x^2+x+1 divided by x+2?

**algebra**

What is the quotient and remainder of 4x^3-2x^2+x+1 divided by x+2?

**math**

What is the quotient and remainder of 4x^3-2x^2+x+1 divided by x+2?

**ELA**

In the clever daughter adapted from a Czech folktale, why does the magistrate use a riddle to decide the case?

**Math**

The mean of 4 numbers is 15.Three of them are 7,10,14.Find the fourth number

**MATH**

A family has 4 children. A tree diagram or systematic list can be used to show how many ways the children could have been born, from first born to last born. Determine how many ways the family could have had one boy and 3 girls.

**Math**

What is the best estimate for the product of 289 and 7?

**Social Studies (check my answers))**

correct

**math**

diamonds , 1 club and 2 heart

**Algebra**

If x<5<1/x-1, then x could be which of the following? a) 5 b) 1 c) 7/6 d) 10/3 Please help, I am thinking the answer is C.

**Physical Science**

Green light has a frequency of about 5.3Hz×1014Hz. Using the relationship c=fλ, find its wavelength in air.