# Posts by Brittany

Total # Posts: 951

**Chemistry.**

An X-ray beam with = 151 incident on the surface of a crystal produced a maximum reflection at an angle of = 28.2. Part A Assuming , calculate the separation between layers of atoms in the crystal. Confused on which formula to use to find this answer.

**Chemistry**

Four ice cubes at exactly 0 ^\circ {\rm{C}} having a total mass of 55.0g are combined with 110g of water at 77^\circ C in an insulated container. Part A If no heat is lost to the surroundings, what will be the final temperature of the mixture?

**PRE-ALGEBRA**

An adult house cat could be about 1____ high.

**intergrated topics/math**

i need help i don't get this problem......

**intergrated topics/math**

solve for x: 4x(5-6)=10(6x+2)

**chemistry**

C4H8CLO2 PREDICT THE IR ABSORBANCIES PROTON NMR AND 13C NMR SPECTRAL CHARACTERISTICS FOR THE FOLLOWING MOLECULE. DRAW THE EXPECTED SPECTRA. ALSO PREDICT THE MASS SPECTRUM SHOWING THE MOLECULAR ION AND ANY SIGNIFICANT HIGHER M/Z PEAKS.

**Grammar**

Identify the abbreviations in this sentence. When they raise me to a high position, then ill get a raise.

**Physics**

A 50kg box is sitting on your front porch. The coefficient of sliding friction between the box and floor is .4. You are trying to push the box from the porch into the house. What is the force required to push the box at a constant speed?

**math**

Is the expression a monomial? explain. qs + 5

**Physics**

An object is placed 8 cm in front of a convex lens of focal length 6 cm. Find the image location by drawing a ray tracing diagram to scale. Verify your answer using the lens equation.

**precalccc**

find all the real zeros and multiplicity of f(x)=x^4-68x^2+256

**business andmin admin communication**

thank you so much ms sue. I was able to take the questions we differed on look through the reading material to really get a grasp on the concepts. I was able to resubmit the test (not counted toward grade) just to see if my understanding had improved. i only got 2 wrong that ...

**business andmin admin communication**

1c 6a 11b 16a 2a 7c 12c 17d 3d 8b 13c 18c 4d 9b 14d 19c 5a 10d 15b 20b These answers got me a 65.. thought i had a firm grasp on the concepts in the chapters... now i want to go back and read over the incorrect questions to get a better understanding

**business andmin admin communication**

i got a 65, on it. i can post my answers also. i was having a hard time figuring out which questions i got wrong.

**Algebra/Math**

A total of 504 tickets were sold for the school play. They were either adult tickets or student tickets. The number of student tickets sold was three times the number of adult tickets sold . How many adult tickets were sold?

**Sociology**

The correct answer is A

**Chemistry**

51.34 g of water at 81.5 oC is added to a calorimeter that contains 52.13 g of water at 40.7 oC. If the final temperature of the system is 59.4 oC, what is the calorimeter constant (Ccalorimeter) ? Use 4.184 J/goC for the heat capacity of water.

**Chemistry**

Pentane is a small liquid hydrocarbon, between propane and gasoline in size C5H12. The density of pentane is 0.626g/ml and its enthalpy of combustion is ΔHcomb =-3535kj/mol. Estimate the fuel valve and the fuel density of pentane.

**Chemistry**

Calculate the final temperature of a mixture of 200.0g of ice initially at -16.5 Celsius and 406.0g of water initially at 84.5 degrees Celsius.

**Chemistry**

The flame in a torch used to cut metal is produced by burning acetylene(C2H2) in pure oxygen. Assuming the combustion of 1 mole of acetylene releases 1251kj of heat, what mass of acetylene is needed to cut through a piece of steel if the process requires 36.658 x 10^4 kj of heat?

**Chemistry**

Which of the following gases will effuse through a hole in a balloon fastest? a.Kr b.NO c.N2O d.NO2 e.ArNO2

**Chemistry**

What is the root-mean-square speed of N2O at 25°C?

**Chemistry**

The density of an unknown gas is 1.72 g/L at 750.0 torr and 30.0°C. Which of the following could be the unknown gas? a. CS2 b. NO c. N2O d. NH3 e. N02

**Chemistry**

Which of the following reactions will result in a reduced total pressure? a. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) c. 2HI(g) → H2(g) + I2(g) b. 2N2O(g) → 2N2(g) + O2(g) d. 2H2(g) + O2(g) → 2H2O()

**Chemistry**

How many moles of propane are contained in a 5.00 L tank at 450 torr and 25°C?

**Chemistry**

In an experiment, 25.0 mL of a gas with a pressure of 1.00 atm is contained in a balloon at 25.0°C. The balloon is then cooled to 5.0°C, and the pressure is found to be 0.750 atm. What is the volume of the gas under the new conditions?

**Chemistry**

Iron(III) oxide reacts with carbon monoxide gas to form solid iron metal and carbon dioxide gas: Fe2O3 + 3 CO --> 2 Fe + 3 CO2 If you begin the reaction with 84.34 g of iron(III) oxide and 68.87 g of CO, which reactant will be in excess at the end of the reaction and how ...

**Chemistry**

Which one of these samples contains the smallest number of molecules? a. 1.0 L of H2 at STP (0°C and 1atm) d. 1.0 L of N2 at 0°C and 800 torr b. 1.0 L of N2 at STP e. 1.0 L of He at STP c. 1.0 L of H2 at 20°C and 760 torr

**Chemistry**

Methanol (CH4O) is converted to bromomethane (CH3Br) as follows: CH4O + HBr --> CH3Br + H2O If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr, what is the percent yield?

**Childhood Education**

How does poverty relate to a child's risk for inadequate health and well-being?

**Childhood Education**

What items would you first look for to determine whether lead is present in the environment where children are present?

**Childhood Education**

Can anyone answer this question? Compare the environment for toddlers with one suitable for infants. How are the areas similar? How are they different?

**Childhood Education**

Compare the environment for toddlers with one suitable for infants. How are the areas similar? How are they different?

**Childhood Education**

Compare the environment for toddlers with one suitable for infants. How are the areas similar? How are they different?

**Chemistry**

CF2CI2 Mass: 1.02kg what are number of molecules , and moles

**Organic Chemistry**

An expanded structural formula shows all the atoms of the molecule and all the bonds between the atoms in the molecule. Draw the expanded structural formula for 1,3-dichlorocyclopentane. Draw the structure by placing atoms on the grid and connecting them with bonds. Include ...

**english-dr.faustus**

the answer was B

**english-dr.faustus**

the warning Dr.Faustus teaches is? A-the devil is evil B-do not wish for more than heavenly power permits C-the end will justify the means D-both A and C

**math**

the product of a 1 digit number and a 2-digit number number is 284 what is the answer

**Pre-Algerbra**

In which quadrant does the point lie? Write the coordinates of the point. Point B A. quadrant II; (–2, –4) B. quadrant III; (2, 4) C. quadrant III; (–2, –4) D. quadrant IV; (–4, –2)

**Chemistry/Quantitive Anaylsis**

Determine the absolute and percent relative uncertainty expressing the result in the correct number of significant digits a.) 6.2 (+-0.2)-4.1(+-0.1) b.)[9.23(+-0.03)][4.21(+-0.20}/21.1(+-0.2) c.)log[3.1415(+-0.001)] d) log[(0.104(+-0.0060)]^1/2 /0.0511(+-0.00090]

**Chemistry/Quantitive Anaylsis**

Before determining the amount of sodium carbonate in a sample by titration with standard hydrochloric avid the anaylst decide to check the procedure by analyzing a known sample of 98.75 (w/w)% purity. Five replicate determinations of the known gave the following results: 98.71...

**Chemistry**

The amount of energy released by burning a fuel source, measured in energy per mass, is called the fuel value. If all the energy obtained from burning 1.30 pounds of methane (fuel value is 11.97 kcal/g) is used to heat 122.0 kg of water at an initial temperature of 21.1 °C...

**college stats**

A study wants to examine the relationship between student anxiety for an exam and the number of hours studied. The data is as follows: Student Anxiety Scores Study Hours 5 1 10 6 5 2 11 8 12 5 4 1 3 4 2 6 6 5 1 2 Why is a correlation the most appropriate statistic? What is the...

**Early childhood education**

Awesome! Thanks!

**Early childhood education**

Special educational services for young children with disabilities: a. Cannot be enforced through laws. b. depend on parent efforts. c. do not involve the Head Start Program. d. are rooted in federal legislation. I'm thinking D is the correct answer?

**Exceptional Children**

Most early childhood professionals children’s agree that the terms inclusion and mainstreaming: A. Both refer to exceptional children’s participation in the general education curriculum. B. Mean the same thing. C. Are two different concepts. D. Both refer to programs...

**English**

I had to write a paragraph about a personal experience of mine with no passive verbs. When I submitted mine my teacher told me it was almost correct but not right yet. Could you tell me a list of passive verbs?

**Computers**

What are calculations entered into a spreadsheet called? Formulas? Or Values? I'm thinking its formulas but Values talks about calculations on a spreadsheet too.

**geometry**

PM is the median of trapezoid KLNO. If ON = 24 centimeters and KL = 12 centimeters, which is the length of PM

**math**

You need to prepare 180g of a 10% cream using 30% stock cream base.how much is needed for each

**literary**

I need an example of connotation from the Star Wars series in the form of a quote.

**Bio**

Assume that a cell culture has a density of 108 cells/mL. You transfer 20 microliters (20 L) of this culture onto a microscope slide. How many cells do you expect will be in this 20 L drop you placed under the microscope?

**geometry**

Given letters gb and gf how do you write a mathematical to compare their measures?

**Statistics**

An important measure of the performance of a locomotive is its "adhesion," which is the locomotive's pulling force as a multiple of its weight. The adhesion of one 4400-horsepower diesel locomotive model varies in actual use according to a Normal distribution ...

**Statistics**

An important measure of the performance of a locomotive is its "adhesion," which is the locomotive's pulling force as a multiple of its weight. The adhesion of one 4400-horsepower diesel locomotive model varies in actual use according to a Normal distribution ...

**Math**

9.45*10^15

**physics**

If you walk for 1.66min at a speed of 1.22m/s and then run for 1.66min at 3.05m/s along a straight track, what is the average velocity?

**Social Studies**

its not a or b cause i took the test the answer is cold war spending

**Math- STATS 218**

When the following hypotheses are being tested at a level of significance of aH0: m 100 Ha: m < 100 the null hypothesis will be rejected if the test statistic Z is a. >Z b. >Z c. <Z d. <100

**critical reading**

Elaborate comparisons which are used by advertisers are usually _____. A)fallacies of evidence. B) fallacies of language. C)newsworthy. I think it is B, is this correct?

**health**

C.

**Math**

Calculate the percentage strength of hydrocortisone if you combine 30 g of 1%, 45 g of 0.5%, and 15 g of 2%. Round to the hundredth.

**Math**

Androgel is available in 1% strength. A provider prescribed it for a patient but would like to minimize side effects by starting treatment at a lower 0.3% strength. How much androgel should be added to a base gel to prepare 15 g of the desired strength?

**Phamacy School**

What is the percentage strength of tretinoin gel when you combine 15 g of 0.025% and 30 g of 0.01%?

**MATH**

What is the percentage strength of tretinoin gel when you combine 15 g of 0.025% and 30 g of 0.01%?

**MATH**

Calculate the percentage strength of hydrocortisone if you combine 30 g of 1%, 45 g of 0.5%, and 15 g of 2%. Round to the hundredth.

**MATH**

Calculate the amount of 8% acetic acid needed to combine with water to make 600 ml of 3.5% acetic acid.

**math**

What answer did u get

**English III**

# 3 is B

**GEOMETRY**

if AB=5X+3 and BC=7x-9 what is the value of AC? using the addition segment postulate

**Stats**

I posted this question straight from the quiz, so I'm not sure why you're confused.

**Stats**

Find the number z (± 0.01) such that the proportion of observations that are less than z in a standard Normal distribution is 0.8 Find the number z (± 0.01) such that 59% of all observations from a standard Normal distribution are greater than z

**history**

Which system of Spanish government did haciendas replace? A. the encomienda B. popular sovereignty C. socialism D. coalitions

**algebra 2**

find the exact value using the unit circle cos 3.14/6

**geometry**

PLEASE HELP WITH A FEW QUESTIONS triangle ABC has side lengths 8, 15, and 17 do the side lengths form a pythagorean triple? the length of the hypotenuse of a 30-60-90 triangle is 7 find perimeter to approach the runway, a pilot of a small plane must begin a 10descent starting ...

**geometry**

I was looking for how to do proportions, i had forgot.

**geometry**

Thanks for the help on one problem

**Chemistry**

I need help with the Lewis Dot Structure. I'm so lost. The problems I have and need help with are 1) H2NCH3 2) C3H6 3)NO2-ion 4) H3CSCH2F 5) NCl3 6) H2NCOOH 7)C3H7OH

**History**

What were the causes of the War of 1812? Where did Republicans and Federalists stand on declaring and then fighting the war? What regional tensions did the war expose?

**Chemisty**

A 2.5 L volume of sodium hydroxide solution was prepared. The titrant was standarized against primary standard oxalic acid dihydrate, H2C2O4*H2O(molar mass is 126.06) if a 0.4774g sample of the prmiary standard consumed 31.94mL of the base solution in reaching the ...

**Chemistry**

A Student Performing a lab weighed a 1.0993g sample, containing an unknown KHP, which required 18.06mL of 0.1879M NAOH to reach the phenolphtalein endpoint. a) How many moles of base were consumed by the KHP in this sample? b) How many grams of KHP were titrated? c)What is the...

**english**

According to the Introduction, who encouraged Mary Shelley to expand Frankenstein into a full-length novel

**statistics**

Whats the difference between creating a z score from a single score and creating one fron a sample mean?

**English 4**

the choices are: A-the birds were flying over the sea in a straight formation B-the seas were rough C-there was a faint outline of the old man in the crescent of the new moon D-all of the above

**algebra**

How would I show my work for: 3-2(3)+2(4)+1

**Intermediate Algebra (college)**

Use the properties of logarithms to condense the expression 1/3[ln(x - 6)- 4 ln y - 2 ln z]

**Precalc**

if sine theta=.3416 and theta is in quadrant I what is cos theta/2? Using double angle identities.

**statistics**

I guess 100 is the highest the mean is 30.9 and the standard deviation 2.08 it just says children below the 30th percentile

**statistics**

Children below the 30th percent are in need of special assistance assistance what raw score makes the cut off score for these children?

**Physics**

Two parallel wires conduct equal currents in the same direction. (a) At a point in the plane of the wires midway between them, do the individual fields of the wires cancel or reinforce each other? (b) At a point far away from the wires, do their individual fields tend to ...

**AP Chemistry**

A voltaic cell is constructed that uses the following half-cell reactions. Cu+(aq) + e- Cu(s) I2(s) + 2 e- 2 I -(aq) The cell is operated at 298 K with [Cu+ ] = 2.3 M and [I - ] = 3.3 M. (a) Determine E for the cell at these concentrations. (b) If [Cu+ ] were equal to 1.0 M, ...

**AP Chemistry**

A voltaic cell is constructed that uses the following half-cell reactions. Cu+(aq) + e- Cu(s) I2(s) + 2 e- 2 I -(aq) The cell is operated at 298 K with [Cu+ ] = 2.3 M and [I - ] = 3.3 M. (a) Determine E for the cell at these concentrations. (b) If [Cu+ ] were equal to 1.0 M, ...

**CHEM**

Given the equation 2C8H18 + 25O2 = 16 CO2 + 18H2O: The combustion of octane produces carbon dioxide and water. If you start with 10.0 moles of octane, what mass of water (in grams) would you expect to produce?

**Chemistry 1201**

thankyou so much! i got 3.65*10^25

**Chemistry 1201**

A solution of ammonia and water contains 1.00×1025 water molecules and 5.50×1024 ammonia molecules. How many total hydrogen atoms are in this solution?

**chemistry**

Calculate the enthalpy change for converting 10.0g of ice at -25 degrees Celsius to water at 80 degrees Celsius. The specific heats of ice, water, and steam are 2.09j/g degrees Celsius, 4.18j/g degrees Celsius, and 1.85j/g degrees Celsius. The enthalpy of fusion for water is 6...

**chemistry**

How do I do a question like this please help and explain it!! Calculate the pH of a buffer solution that contains 0.22 M benzoic acid (C6H5CO2H) and 0.24 M sodium benzoate (C6H5COONa). [Ka = 6.5 × 10-5 for benzoic acid] Round your answer to two places past the decimal.

**Chem 111**

A solution is prepared by mixing 499 mL of 0.19 M Tris·Base and 592 mL of 0.37 M Tris·Acid. What is the pH of this solution? [Ka(Tris·Acid) = 8.5 × 10-9] Round your answer to two places past the decimal. I can do basic pH questions but I am at a loss...

**math**

A town has a population of 32,000 in the year 2002; 35,200 in the year 2003; 38,720 in the year 2004; and 42,592 in the year 2005. If this pattern continues, what will the population be in the year 2016?