# Posts by Jessica

Total # Posts: 3,345

**Chemistry**

I think I understand the SiO2 having a smaller amount present because the SiO2 most will absorb into the atmosphere due to the amounts of oxygen in the mixture to the oxygen level present in the atmosphere. I think the NaCl mass changes due to the heating process and alters ...

**Chemistry**

Beaker with the mixture, add distilled water, stir, pour through filered funnel= residue and filtrate filrate is boiled over a hot plate and the water boils off leaving just the NaCl

**Chemistry**

I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...

**Math**

John has 18 coins worth $1.25. Some are nickels and dimes. How many of each does he have?

**Physics**

A 1.40 kg skateboard is coasting along the pavement at a speed of 5.5 m/s when a 0.800 kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat combination.

**Chemistry**

What mass in grams of a 0.500 m(molal) solution of sodium acetate, CH3CO2Na, in water would you use to obtain 0.200mol of sodium acetate?

**Calculus**

Find an equation of the plane. The plane that passes through (8, 0, −2)and contains the line x = 6 − 2t, y = 3 + 5t, z = 3 + 2t

**maths**

1 curry and 1 tea cost £4. 2 curries and 2 puddings cost £9. 1 pudding and 2 teas cost £2. What do you have to pay in total for 1 curry, 1 pudding and 1 tea? What does each item cost on its own?

**math**

1 curry and 1 tea cost £4. 2 curries and 2 puddings cost £9. 1 pudding and 2 teas cost £2. What do you have to pay in total for 1 curry, 1 pudding and 1 tea? What does each item cost on its own?

**Science ~CHECK MY WORK PLEASE~**

A scientist is trying to determine the identity of an element. It is highly reactive in water and forms an ionic bond with chlorine. It is also very shiny. The element is likely A. From Group 17 ********** B. From Group 1 C. From Group 15 D. A Noble Gas Which is most likely to...

**Science -CHECK MY WORK-**

Subject: The Periodic Table

**Science -CHECK MY WORK-**

a.) How can you describe the location of vanadium (V, atomic number 23) on the periodic table? Choose all that apply. 1. period 5, group 4 <<<My choices>>> 2. period 4, group 5 3. lanthanum series <<<My choices>>> 4. nonmetals 5. transition ...

**Algebra**

Systems of equation 1. +2y=5 8 -6y=3x-15 2).p-2q=4 2q=p+2 Solve the equations? I am stuck on how to do these last to problems thanks for the help

**Physic II**

Explain how objects can get charged by Friction.

**Physic II**

Explain how objects can get charged by Friction.

**college physics**

17.776

**tech**

B

**Equation solving**

Perpendicular. To x-3y=2 and contains ( 2,4) 2). That is parallel to 2x+5y=4 I don't get how to solve and use y=Mx+b

**Eng**

I have to do an assignment on Ecosystems perspective and social work. I'm asked to write how they would apply the in ecosystems working with a community issue. How should I start my essay? I need ideas and issues to write and what exactly is ecosystem perspectives? Thank you!

**Accounting**

it is c do you need any help on anything else and my name is Jessica

**English**

WRITE THE DEBATE

**someones GOTTA help me with this science...!!!**

I got a 60% cause them other people!😒

**Math**

1. Marissa is a photographer. She sells framed photographs for $100 each and greeting cards for $5 each. The materials for each framed photograph cost $30, and the materials for each greeting card cost $2. Marissa can sell up to 8 framed photographs and 40 greeting cards each ...

**Chemistry**

Which of the following must be the same before and after a chemical reaction? Answer: The sum of the masses of all substances involved and the number of atoms of each type involved. WHY?

**Chemistry**

Assume a baker of pure water has been boiling for 30 minutes. What is in the bubbles in the boiling water? Answer: water vapor. WHY?

**Chemistry**

Heat is given off when hydrogen burns in air according to the equation: 2H2 + O2 ---> 2H2) What is responsible for the heat? I know the answer is froming hydrogen-oxygen bonds gives off energy, but why?

**Chemistry**

Iron combines with oxygen and water from the air to form rust. If an iron nail were allowed to rust completely, one should find that the rust weighs: I know the answer is the rust should way more than the nail it came from but can someone explain why please!

**business math**

What would be the compound amount after 19 years an investment of 42,000 with an 11% interest rate compounded annually?

**Pre-Algebra**

How do you solve 4x+4=9x-36? I understand that you need to get the variables alone but to I add or subtract 9x to both sides?

**Chemistry/Math**

so is my answer correct?

**Chemistry/Math**

The density of water is 1 g/cm^3. What is the mass of 7.500 liters of water reported in kilograms? I got 7.5kg. Is this correct?

**AP Chemistry**

1.6 x 10^16

**Health**

Pulmonary circulation transports oxygen-poor blood from the right ventricle to the ________, where blood picks up a new blood supply. A. Heart B. Lungs C. Brain D. Extremities I said A but it was wrong. I want to say B

**health**

Neurons carry out the functions of the nervous system by conducting ________. A. Nerve stimulation B. Nerve tissue development C. Nerve impulses D. All of the above I wanna say C, but I want to make sure I am right.

**math**

i need help on properties of arithmetic

**math**

Fran Molley is married, claims five withholding allowances, and earned 3,500 gross per month in edition to federal income tax, social security, and Medicare withholding , Fran pay 2.1% state income tax, and 1/2% for state disability insurance ( both based on her gross income...

**math**

Arturo Muina is the captain of a charter fishing boat. He is paid salary of 140 per day He also averages tips amounting to 12% of 475 daily charter rate. Last month during a fishing tournament, Arturo worked 22 days. What were his total gross earnings for the month?

**Government**

What issues do liberals and conservatives support and what constituency do they serve?

**algebra**

F(X)=45+5x

**I NEED HELP TOO!!!**

how did you get part a and b???

**Math**

Ok, now this is a question I was looking for. So, I have the answer choices, so I know what to do. A) 9 bags of sugar and 10 bags of flour. Sugar is 2 pounds. So 9X2= 18 Flour is 5 pounds, which is 10X5=50 50+18=68 That is not 48 pounds. Moving on. B) 4 bags of sugar and 8 ...

**Geometry**

Kelly drew four points A, B, C, and D in her notebook. A straight line joins points A and C. Another straight line joins A and B. A point D is located on the left of the line AB Kelly made the following statements about the points. Statement 1: There is at least one more point...

**Biology**

Can someone provide an example of positive and negative control in a very easy and simple example?

**Math**

the area of a yard is 420 ft. what is the probability that any leaf landing in the yard will land ina circular wading pool that has a diameter of 14 ft?

**Calculus**

The first boat is sailing towards the North at the speed of 6 km per hour and sees that another boat is heading east at the speed of 5 km per hour. The second boat is to the northwest of the first boat. what is the minimum distance between two boats, assuming that they do not ...

**Math**

2/5 is 0.4. Multiply by 100, you get 40% -> 40% of the figure is shaded. so the percentage of the figure that is not shaded is 100% - 40% = 60%

**health**

what does hiv stand for

**maths probability**

Consider an experiment with four possible outcomes which we denote by Wi for i = 1,2,3,4. Sample space is Omega = {w1,w2,w3,w4}. Consider events A= {w1}, B = {w1,w2}, C = {w1,w2,w3} and D = {w2,w4}. Given that P(A) = 1/10, P(B) = 1/2, P(C) = 7/10, compute P(D)

**Chemistry**

At a certain temperature, the Kp for the decomposition of H2S is 0.774. H2S(g) <---> H2(g)+S(g) Initially, only H2S is present at a pressure of 0.120 atm in a closed container. What is the total pressure in the container at equilibrium?

**math**

Nancy made the following statement: The range of f(x) = ax + b is the set of all real numbers given that a and b are real numbers. Which produces a counter example to her statement? b = 0 a = 0 b < 0 a < 0 i think its a=0 please help

**chemistry**

consider the following reaction at 298K 4Al(s)+3O2(g) yields 2Al2O3(s) delta H= -3351.4 Kj find delta S sys find delta S surr find delta S unvi

**Chemistry**

A student ran the following reaction in the laboratory at 650 K: H2(g) + I2(g) 2 HI(g) When she introduced 0.204 moles of H2(g) and 0.229 moles of I2(g) into a 1.00 Liter container, she found the equilibrium concentration of I2(g) to be 5.77E-2 M. Calculate the equilibrium ...

**Chemistry**

A student ran the following reaction in the laboratory at 327 K: CH4(g) + CCl4(g) 2 CH2Cl2(g) When she introduced 4.07E-2 moles of CH4(g) and 7.57E-2 moles of CCl4(g) into a 1.00 Liter container, she found the equilibrium concentration of CH2Cl2(g) to be 1.21E-2 M. Calculate ...

**Chemistry**

A student ran the following reaction in the laboratory at 651 K: 2 NH3(g) N2(g) + 3 H2(g) When she introduced 8.75E-2 moles of NH3(g) into a 1.00 Liter container, she found the equilibrium concentration of H2(g) to be 0.119 M. Calculate the equilibrium constant, Kc, she ...

**Physics**

A rifle shoots 50.0 gram bullet with a muzzle a velocity of 350 m/s. How fast would a 80.0 kg person have to run in order to have the same amount of kinetic energy as the bullet in flight? If the bullet is shot vertically, what is the the maximum height about the gun barrel ...

**Physics**

A 1000 kg car is going 8.90 m/s has a minimum braking distance of 6.0 meters. Find the average braking force exerted on the car during the stopping process.

**english-project**

Hi!I am doing project, its about making the world a better place for humans. I have to join organizations online and subscribe t email lists to get action updates-issues like anti-war/peace, social justice and environments, animals, food water and democracy. Please tell me ...

**chemistry**

MASS (GRAMS) Nac1- 0.9992 C12H22O11- 0.9822 NH4C1- 0.9510 C6H5OH- 0.9723 C9H20- 1.0038 *Find the Molar Mass (g/mol) for each * *Find the Moles of each element for each * *Find the Atoms of each element for each * - if possible show work and or equation set up to find answers

**Psychology**

Which of the following variables are independent and dependent? 1. Personality and Gender 2. Happiness 3. Scores

**Math/Infinity**

Explain why the union of two countably infinite sets with nothing in common is also countably infinite. I said that it was because the two sets are in one-to-one correspondence with each other. Is this right?

**Thomas Nelson**

Check out definr (dot) com just type in chromatin and see what comes up

**english**

What literary work is this from? You will need to post the lines in order for people to understand your question.

**physics**

A projectile launched straight upward at 141 m/s. How fast is it moving at the top of its trajectory? Suppose it is launched upward at 45° above the horizontal plane. How fast is it moving at the top of its curved trajectory?

**Math/Infinity**

Split the natural numbers into three sets A, B, and C so that the sets have nothing in common, they each are countably infinite, and A U B U C = the set of natural numbers. So here's what I got A: 2,4,6,8,10... B:1,3,5,7,9... C: ? I don't know what to do for C because ...

**Chemistry**

When the stopper of the Erlenmeyer flask is loosened before weighing, why doesn't the carbon dioxide escape? Why isn't the mass of air displaced by the water taken into account when the the mass of water is determined?

**program planning**

Please respond to the following questions either by writing the design name or by describing the design using standard notation (X= program, O=Observation, R=random assignment. For each design, please discuss all threats to internal validity. 1. Design: Single group post-test ...

**Science**

Trini adds 10g of baking soda to 100g of vinegar. The mixture begins to bubble. When the bubbling stops, trini finds the mass of the resulting mixture. She determines its mass is 105g. Why has the mass changed? A. A gas has formed and left the mixture B. Vinegar evaporated ...

**Math (Algebra 1)**

use the cylinder formula and 3.14 time 4 times 4 times 6 then the answer to that is the answer to your problem

**Science**

I think it is A

**Science**

Which of the following is an example of how economics can affect science? A. Limited funding may lead scientists to research one topic instead of another. B. Legislators may create new laws about the use of natural resources based on the recommendations of scientists. C. A ...

**history**

I haven't found anything besides how women went into the armed forces and helped the country.

**history**

how is America's involvement in WW2 relevant to today?

**Science help! URGENT. Check answers**

Do your own work

**(History)**

What specific challenges did the South Vietnamese face as they tried to flee Vietnam in 1975?

**Math**

I thought Huong had to spend $3.42 because I multiplied $.03x9 and got $.27 and then I multiplied $.03x3 and got $.09. I also multiplied $.03x7 and got $.21, then I added them and got $.57. Finally I multiplied $.57x6 (by the number of sides of the box) and got $3.42. However...

**Reading**

64.8% Of students went to the football game are the other half was busy . Can you multiply to get the answer

**Math**

4600

**geography**

this doesn't really answer my question...

**geography**

what does mexico's city site on top of the aztec city suggest about the location?

**Geography (Ms. Sue)**

These countries are located in the western part of the continent.

**Health**

What is intensity?

**chemistry**

What is the major difference between the two-dimensional and three- dimensional models of ethane and methane? When might you choose to use a two-dimensional model rather than a three-dimensional model when representing one of the molecules?

**Finance**

You take out a 30 year $100000 mortgage loan with an apr of 6% and monthly payments. In 12 years you decide to sell your house and pay off the mortgage. What is the principle balance on the loan?

**social studies**

in 1777 who commanded the American soldiers who captured 5,800 british soldiers under general burguyne at Saratoga?

**chemistry**

Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentally mixed. A 4.00-g sample is burned, and 3.30 g of CO2(g) is produced. What was the mass percentage of the table salt in the mixture?

**Math**

The population of New York doubles during the workday. At the end of the workday, the population decreases by half. If the population in New York City is roughly 4,000,000 people before rush hour, and the morning rush hour lasts 3 hours, what would be the population if the ...

**math**

27

**business math**

You are the buyer for the shoe outlet. You are looking for a livie of mes shoes to retail for $49.95 if your objective is a 55% markup based on selling price, what is th most that you can pay for the shoes and still get the desired markup?

**business math**

Carousel Toys has ramper buckaroo wooden rocking horse for toodlers on a 30% markdown sale for 72.09 each what was the original price before they were markdown?

**business math**

The flour power bakery makes 200 cherry cheese cakes at a cost of 2.45 each. If a spoilage rate of 5% is anticipated at what price should the cakes be sold to achieve a 40% markup based on cost?

**business math**

Epicure market prpares fresh gourmet entrees each day. On wednesday, 80 baked chicken dinner were made at a cost of 3.50 each

**business math**

Whawas the orginal selling price of a trendmill curently on sale for 2,484 after a 25% markdown?

**BUSINESS MATH**

You are shopping for an executive desk chair at the furniture Gallery. You see two you like on sale Chair A was originally $119.99 now on sale for $ 79.99 and chairB

**Business Math**

Bloomingdales purchases imported perfume for $24.30 per ounce. If the store policy's to mark up all merchadise in that department 39% based on selling price, what is the retail selling price of the perfume?

**business math**

What is the percent markup based on selling price for the Western Wear shirts?

**business math**

Wyatt's western wear purchases shirts for $49.50 each. A $34.00 markup is added to the shirt. What is the selling price?

**math**

jim paddle from one shore of a lake three miles wide at 4 mph, and john paddles from the opposite shore at 5 mph. how long will they travel before they meet?

**advance icd-9**

This 35-year-old female patient has carcinoma of the upper-outer left breast. She had a lumpectomy performed and a sentinel lymph node biopsy of the axillary lymph node. The pathology report for the lymph node states no pathological change.

**Science**

what is a device that does work in a electrical current? A. load B. turbine C. charge D. Magnet

**health**

Genital HSV-1 outbreaks recur less regularly than genital HSV-2 outbreaks. The answer is c. I took this test and got it right.