Saturday
June 25, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

Science: Chemistry
Pentane (C5H12) burns in oxygen to produce carbon dioxide and water. C5H12(g)+8O2(g)→5CO2(g)+6H2O(g) Calculate the mass of CO2 that can be produced if the reaction of 38.5 g of pentane and sufficient oxygen has a 58.0 % yield.
Sunday, November 15, 2015 by Alex

College Algebra
The students in a political science class are divided up into three categories: liberal, conservative, or moderate. There are five more conservatives than moderates, and twice as many liberals as conservatives. How many of each type are there if there is a total of 87 students...
Sunday, November 15, 2015 by Test

Science/Environmental Studies
What are some dependent variables for Global Warming?
Sunday, November 15, 2015 by John Doswell

science
How much water must be added to 200 g of a 10% NaOH solution to obtain 8% solution
Sunday, November 15, 2015 by mustafa

COMPUTER SCIENCE
how to develop a C program that will determine whether a department-store customer has exceeded the credit limit on a charge account.
Sunday, November 15, 2015 by BILOLI

Allanridge Seconday School
I'm doing History , Life science, Geography and maths literacy......I want to do carreers that relate to helping people and assisting them, I'm more focused on doing therapy when I pass grade 12, So how many percentages is it garanteed that I can get a job after Matric
Saturday, November 14, 2015 by Gugu Hope Mbolambi

science
what is a biome? ecological niche?
Saturday, November 14, 2015 by leena

science
a horizontal beam 6.8m long of mass 15kg is supported by pillars of 0.2 of each end. There is a man of mass 85 kg standing 1.7kg from one end of the beam .draw a diagram showing the forces acting on the beam in this equilibrium condition .calculate the magnitudes of the loads...
Saturday, November 14, 2015 by ben

science
a concave mirror produces a real image 1 cm tall of an object 2.5 mm tall placed 5 cm from the mirror.find the position of the image and the focal length of the mirror.
Saturday, November 14, 2015 by prerna raj sinha

Science
a 1.73 kg steel ball strikes a massive wall at 11.4 m/s at an angle of 50.9 with the perpendicular to the plane of the wall. It bounces off the wall at the same speed and angle it originally had.if the ball is ik contact with the wall for .101 s what is the magnitude of ...
Friday, November 13, 2015 by Cameron

Science
The search for identity usually occurs during???
Friday, November 13, 2015 by Omarion

science plz help fast
how do mutualism and parasitism compare ? 1.)at least one organism is helped in both cases 2.)at least one organism is armed in both cases 3.)organisms are only harmed in both cases 4.)organism are only helped in one while organism are only harmed in the other
Friday, November 13, 2015 by help in science

Science
For the reaction shown below, the instantaneous rate of formation of Br(aq) is 0.12 M/s at t=2.0 min. 3Br0(aq) -> BrO3(aq) + 2Br(aq) What are the instantaneous rates of formation of BrO3(aq) and consumption of BrO(aq)?
Friday, November 13, 2015 by Kry

Science
What laboratory instrument utilized the wave nature of electrons?
Friday, November 13, 2015 by Katie

Science
6. A meander is best described as a A. depression for swimming. B. bend or curve in a stream channel. C. straight streamline into a lake. D. pond located streamside. B?
Friday, November 13, 2015 by Amber

Science
Consider the following reaction: CaCO3 - CaO + CO2 Calcium carbonate (CaCO3) was heated to yield CaO and CO2. If 60.0g of CaCo3 was heated and the yield for CaO was 44.6%, calculate the mass of CaO created.
Thursday, November 12, 2015 by Nasa

science
6) In ovaries, the final products of meiosis are A) haploid cells. B) diploid cells. C) triploid cells. D) polyploid cells. 7) Which example represents a DISADVANTAGE of asexual reproduction? A) Genetic variety slowly causes hundreds of species of beetles to form from a ...
Thursday, November 12, 2015 by crossfire

science
Perfluorotributylamine (PFTBA) is found in extremely low concentrations (0.18 parts per trillion) but it has a great impact on climate. If Pftba concentrations increase, predict what will happen to the climate. Please help?
Thursday, November 12, 2015 by sam

science
1) What is the purpose of DNA? A) manufactures proteins B) reduces activation energy C) stores hereditary information D) to aid in facilitated diffusion 2) What process accounts for species diversity? A) mitosis B) meiosis C) predation D) symbiosis 3) Which process results in...
Thursday, November 12, 2015 by crossfire

science
Student were given a mkxture of marbles,salt sand,and pebbles. Most efficent way to separate this listing 5 step direcxion and the method and what you will be separating?
Thursday, November 12, 2015 by biby

Physics/Science
During a baseball game, a batter hits a pop- up to a fielder 72 m away. The acceleration of gravity is 9.8 m/s^2. If the ball remains in the air for 5 s, how high does it rise?
Thursday, November 12, 2015 by KT

Math
Karl's scores on the first five science tests are shown in the table. Test 1 Test 2 Test 3 Test 4 Test 5 85 84 90 95 88 Part A. Write am inequality that represents how to find the score he must receive on the sixth test to have an average score of more than 88. Part B. ...
Thursday, November 12, 2015 by Wendy

Science
If you were to walk toward a Van der Graaf generator, the effect of its electrical field would get weaker as you got to it. True or False? I say False.
Thursday, November 12, 2015 by Issac2003

Science
If you were creating a lamp by hand what type of material would you chose for the wiring and what material would you chose to coat the wiring? Why?
Thursday, November 12, 2015 by Annie

Science
What must happen to the electrons in a material to create an electric current?
Thursday, November 12, 2015 by Annie

Energy science
The deepest well from which water can be pumped, by creating a vacuum on the top end of the pipe, is 10 m (34 ft). In drilling for oil, wells of a mile or more in depth have to be made. From this depth, how do you think the oil is recovered? .
Thursday, November 12, 2015 by Anonymous

science
What are those
Thursday, November 12, 2015 by Kyle Hall

Science
An electric fence displays a warning sign about the voltage and amperage of the fence. How would amperage and voltage affect the power of the fence?
Thursday, November 12, 2015 by Annie

Science
How does the direction of the electric current, moving across a battery powered device, differ from the direction of travel in the AC current sent to homes and businesses
Thursday, November 12, 2015 by Hannah

Science
Batteries are made of two metals with different electron affinities. What does the phrase “electron affinity” mean and how does this affinity affect the voltage of the battery
Thursday, November 12, 2015 by Hannah

science help
Two scientists did the same experiment but arrived at different results. The scientists most likely did not have accurate data and information misunderstand each other's interpretations belong to different backgrounds did not have instruments to take accurate measurements
Thursday, November 12, 2015 by Oscar

Science
The geologic time scale originally ordered Earth's rocks by: A. absolute age B. relative age*** C. composition D. decades and centuries Where did scientists originally get their information to develop the geologic time scale? A. They collected and studied rock samples in ...
Thursday, November 12, 2015 by Anonymous

natural science
Concentrated sulphuric acid is 90% of the solution it is made of and the remaining mass is water.the molarity of the 90% is 12.2M at room temperature.what is the density of this solution at room temprature
Thursday, November 12, 2015 by pethias

physical science
Memo of physical science question 7 November 2014 grade 11
Thursday, November 12, 2015 by Anonymous

maths lit,physics,life science n tourism
i don't know which career to choose can you help me ?I'm doing grade 11.
Thursday, November 12, 2015 by anita

Art
how are art and conservation science connected in this sculpture? A. The artists was repurposing materials to create art B. The artists only used brand-new materials to create art. C. the artists created a piece that could not be sen by others D.The artists used chemical ...
Thursday, November 12, 2015 by Lin

science
What would be the volume of a gas inside a 360cm box?
Wednesday, November 11, 2015 by Michael

science
pftba is found in extremely low concentrations (0.18 parts per trillion) but it has a great impact on climate. if pftba concentrations increase, predict what will happen to the climate
Wednesday, November 11, 2015 by sam

science
A motorcyclist is trying to leap across a canyon by driving horizontally off a cliff (height= 60 m) at a speed of 25 m/s. The cycle strikes a cliff on the other side (height= 30 m) at a speed of 15 m/s. Find the work done by air resistance.
Wednesday, November 11, 2015 by Daniela Belen

science
the small piston of a hydraulic press has an area of 2.0 cm and the large piston has an area of 16 cm if the small piston has a force of 4.0 N applied to it the output force of the large piston is
Wednesday, November 11, 2015 by Elisabeth

Science
1) Which of the following is true about photosynthesis? A. It is an exothermic reaction B.It is a endothermic reaction ***** C.It produces carbon dioxide D. It occurs in animals 2) Atomic Theory is A.Subject to change if new information is discovered B.A solution to the ...
Wednesday, November 11, 2015 by noname

Science
Nothing.
Wednesday, November 11, 2015 by Anonymous

Science CHECK ANSWERS! PLEASE HELP!! :(
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...
Wednesday, November 11, 2015 by OHI

Kopanang Senior Secondary school
Am in grade 10 am doing maths literac,geograph,life science,life orientation,consumer studies,english an spedi which carrer must I take?
Wednesday, November 11, 2015 by Pretty Molapo

Science
Can a molecule be an element? Molecules of most elements are made up of only one atom of that element. So, if a molecule is what you get when any atoms join together then no, a molecule can not be an element
Wednesday, November 11, 2015 by Sue

SCIENCE CHECK ANSWERS!!! HELP PLEASE
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...
Wednesday, November 11, 2015 by OHI

science
Why is biological classification important?
Wednesday, November 11, 2015 by stephania

Science
Concentrated phosphoric acid is 90% by mass and the remaining mass is water.The molarity of phosphoric acid in 90% is 12.2M at rtp. a)What is the density of the solution at rtp ? b)What volume (in mL)of this solution is needed to make a 1.00L solution of a 1.00M phosphoric ...
Wednesday, November 11, 2015 by Joseph

science
1. Name the components of the respiratory system in the order incoming air would encounter them during breathing. a.)trachea, pharynx, larynx, alveoli, bronchi b.)bronchi, larynx, alveoli, trachea, pharynx c.)larynx, trachea, bronchi, pharynx, alveoli d.)pharynx, larynx, ...
Wednesday, November 11, 2015 by something

Marie Ernestine
Math/Science A car starts from rest and moves at the speed of 30 kph after half an hour. What is the cars acceleration?
Wednesday, November 11, 2015 by Jack

Science
A student is trying to identify the different forms of energy described in the following chart: Form of Energy Description Examples Energy A energy that travels in waves through space light radio waves Energy B energy that depends on the height of an object a person at the top...
Wednesday, November 11, 2015 by Ariel

Science
1. Douglas Fir tree rings - excavated from a cave in Arizona. Date: 577 ± 50 years AD Answer: 1373 2. Wood from Egyptian coffin - from the Ptolemic period based on style. Date: 200 ± 150 years BCE Answer: 2150 3. Wood fragments from the floor of a palace in Syria...
Tuesday, November 10, 2015 by Alana

molate high school
im a grade 11 learner doing life science,maths literacy,geography and business studied which carrier path do i fit in
Tuesday, November 10, 2015 by mxolisi

science
4. Jenny crosses 2 hybrid pea plants. What is the probability that the offspring will be short? Draw a punnett square below to solve this problem
Tuesday, November 10, 2015 by ttng

i need help science plz hurry
Identify the choice that best completes the statement or answers the question. 1. Studies conducted in England during the Industrial Revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The most likely ...
Tuesday, November 10, 2015 by shynice

science plz help me asap
1-which of the following helps ensure a group's access to resources it needs for survival? A. courtship ritual B. Hibernation C. Conditioning D. Territorial behavior**** 2-which of the following is an example of a cooperative behavior? A. A lion hunting a zebra B. Two male...
Tuesday, November 10, 2015 by Regan

Science
You are creating a carbon cycle poster. which object could you add to the image as another example of combustion of fossil fuels? A. the sun B.a buzzard eating a dead animal C.a person driving a car D.a scientist digging up fossils My answer is A is that correct
Tuesday, November 10, 2015 by Ariel

science help ASAP
which of the following is not a benefit provided through social group? A. instinct to run from predators**** B. Access to mates C. protecting young D. learning to recognize predators] which of the following helps ensure a groups access to resources it needs for survival? A. ...
Tuesday, November 10, 2015 by Regan

science help
which of the following is an example of cooperative behavior? A.a lion hunting a zebra B.two male peacock fighting over a female peacock**** C.a hyena stealing a cheetah's kill D.a blue jay calling to signal the presence of a hawk.
Tuesday, November 10, 2015 by Regan

math
In a science experiment, the temperature of a substance is changed from 42°F to -54°F at an average rate of -12 degrees per hour. Over how many hours does the change take place? **Write as an expression and solve THANK YOU!
Tuesday, November 10, 2015 by kimie

Science
2-abc 3-def 4-ghi 5-jkl 6-mno 7-prs 8-tuv 9-wxy 639-8667(Apple dodger) 622-4463(let it do the work) 385-2786(an important point)
Monday, November 9, 2015 by Anonymous

science
hi. can you help me with my homework? here is my homework. How are bacteria different from protists. I hope you can help me. Have a nice night. Also, this is due tomorrow. Thank for helping me. Please answer this fast and I know you have a lot of kids to help like me. Also ...
Monday, November 9, 2015 by stephania

science project
what is the control in the experiment gummy bears?
Monday, November 9, 2015 by destiny

science help
Which of the following is a process that occurs only in the biosphere? condensation infiltration precipitation transpiration is it d
Monday, November 9, 2015 by Oscar

science help
Where does infiltration occur? in the atmosphere in the biosphere in the geosphere in the hydrosphere is it c
Monday, November 9, 2015 by Oscar

Science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere Chromospheres Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar system? Hydrogen and helium ...
Monday, November 9, 2015 by Shalee^~^

science help
How would planting trees most affect the water cycle? decrease in evaporation increase in transpiration movement of water to new locations water pollution is it b
Monday, November 9, 2015 by Oscar

science help PLS
Which of the following statements about matter is false? The amount of matter increases slightly as water changes state. The amount of matter in an object remains the same during changes in state. Matter is neither created nor destroyed. Liquids, gases, and solids are all ...
Monday, November 9, 2015 by Oscar

Science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere Chromospheres Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar system? Hydrogen and helium ...
Monday, November 9, 2015 by Shalee^~^

science
25.0 mL of an unknown HCl solution is titrated with 17.5 mL 0.100 M NaOH. What is the Molarity of the HCl solution?
Monday, November 9, 2015 by ghada

Science
How do microorganisms affect the quality of soil? A. By breaking down the remains of dead organisms B. By creating tunnels C. By absorbing water D. By increasing mechanical weathering
Monday, November 9, 2015 by brookieluvs

Science
Cosmos Episode 1 Worksheet Directions: Answer the questions as you watch episode 1 of Cosmos: A Spacetime Odyssey 1. What is the name of Neil deGrasse Tyson’s “spaceship” 2. What is responsible for creating wind and keeping everything in the solar system in its ...
Monday, November 9, 2015 by verna

science
A 2.5L flask contains 0.25mol each of so2 and n2 gas at 27 ° c. calculate the partial pressure exerted by each gas and also the total pressure exerted by each gas and the total pressure. name the law on which it is based
Monday, November 9, 2015 by Hafeeza

Science
An experimental model rocket has a mass of 0.054kg. The fuel that was used in one test had 215J of chemical potential energy. When the rocket reached an altitude of 119m, it was travelling at 48m/s and still rising. With what efficiency did the rocket convert chemical ...
Monday, November 9, 2015 by Annie helpppp

vcu
Subject: physical science, question: The density of water is p=1g/cm3. What is the mass of 2mL of water?
Monday, November 9, 2015 by Debbie

Science
For each of the following experimental conditions determine whether molar mass would be: 1) too high, B) too low or C) unaffected. In each case, explain how this result occurs a) after removing the flask from the water bath, the experimenter cools the flask to room temperature...
Sunday, November 8, 2015 by S

math, science
An atomic force microscope cantilever, of rectangular cross section, has a length, l, of 200μm, a width, b, of 20μm and a depth, h, of 1μm. It is made of silicon nitride, which has a Young's modulus, E, of 300GPa. What is the maximum force that can be ...
Sunday, November 8, 2015 by HELP

Science
Can someone please help me with this problem? A 200-1b block rests on a horizontal plane. Find the magnitude of the force P required to give the block an acceleration of 10 ft/s2 to the right. The coefficient of friction between the block and the plane is 0.25.
Sunday, November 8, 2015 by Latoya

liberty college
I am in grade 12 and I have taken History, matches literacy, English language/ literacy,life science, business studies and economics, what course will these subjects allow me take in university? Regards Rita.
Sunday, November 8, 2015 by Rita Petlane

Math Word Problem
A teacher from Anderson Middle School printed k nametags in preparation for the science fair. Half of the nametags were given out to students and 100 nametags were given out to parents. Three-fifths of the remaining nametags were given out to teachers and contests judges. How ...
Sunday, November 8, 2015 by Why?

Science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere Chromosphere*************** Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar system? Hydrogen and...
Saturday, November 7, 2015 by Lea

Science
How did the discovery of the electron change the atomic model? A.It disapproved the earlier idea of an invisible atom. B. It confirmed that atoms are very tiny C. it exposed fraudulent conducted by unqualified scientist D. It proved that atoms are easier to see than once ...
Saturday, November 7, 2015 by Lea

Science
How can you describe the location of magnesium (Mg, atomic number 12) periodic table? A. nonmetal B. metalloid C. group2, period3 D. group3, period 2 @Ms.Sue My answer is C. Can you check my answer Thank you
Saturday, November 7, 2015 by Ava

general physics question
Whenever I read my science textbooks, they always say that "electrons were fired" or "stream of electrons were fired to the target" during an experiment my question is, how to they generate a stream of electrons to fire in a line?? sorry if this is a dumb ...
Saturday, November 7, 2015 by Anonymous

Science
Which process of the carbon cycle is responsible for the release of carbon at the power plant, as shown by the arrow? A. combustion B. photosynthesis C. digestion D. decomposition @Ms.Sue can you check my answer I think the answer is A.
Saturday, November 7, 2015 by Ava

science-chemistry
The free energy generated by ion movement in the cell is used by the cell to do work. Compute the minimum number of millimoles of sodium that would be needed to pump one millimole of calcium ions if the following concentrations were present in the cell. Assume the temperature ...
Saturday, November 7, 2015 by rashi

science
Gf of H2CO3 = -616.1 KJ/mol Gf of H20 = -237.1 KJ/mol Gf of CO2 = - 394.4 KJ/mol 3. A. Carbon dioxide dissolves in water to form carbonic acid. Estimate the thermodynamic equilibrium constant for this reaction using the ΔGf° values shown here. B. Carbonic acid then ...
Saturday, November 7, 2015 by rashi

science-chemistry
The Ksp of mercury(II) hydroxide, Hg(OH)2, is 3.60 × 10-26. Calculate the solubility of this compound in g/L. Gf of H2CO3 = -616.1 KJ/mol Gf of H20 = -237.1 KJ/mol Gf of CO2 = - 394.4 KJ/mol 3.
Saturday, November 7, 2015 by rashi

science
Calculate net force when mass =2000kg, uniform velocity =60kg/hr
Saturday, November 7, 2015 by karan

Physical science 9
why is the SI unit of acceleration is m/s2
Friday, November 6, 2015 by Anamarie

science
What best accounts for the retreating of a waterfall? Only one answer is right 1) meandering stream action 2) erosion of the stream bed Is it number 1?
Friday, November 6, 2015 by john5

science
Briefly explain why potassium chloride readily disolves in water? Include a sketch of the water molecule Showing its polarity.
Friday, November 6, 2015 by freedom

science
If you pour 40g of refrigerated milk (at 4 degrees C) into 200g of freshly percolated coffee (at 96 degrees C), what would the final temperature of your coffee be? Milk has a specific heat capacity of s=3.93J/g degrees C. Coffee has a specific heat capacity of s=4.18J/g ...
Friday, November 6, 2015 by freedom

Science
Multiple Choice 1. Which of the following terms refers to an object that orbits the sun and has enough gravity to be spherical but has not cleared the area of its orbit? (1 point) comet asteroid dwarf planet planet 2. Which of the following statements about the solar system&#...
Friday, November 6, 2015 by Cami

SCIENCE HELP
How will the spacecraft for this mission be designed? What parts are for overcoming the challenging conditions? What parts are for collecting data? What are other parts of the design? I planned to go to mercury- what do I put:(((
Thursday, November 5, 2015 by Areana

Science
what are some tools used to collect data in space?
Thursday, November 5, 2015 by Cami

science
International efforts are being made to safeguard against the misuse of weather modification. An example of the potential to "misuse" the weather is 2)creating droughts or floods for military purposes 4)modifying jungle environments to accommodate transportation needs
Thursday, November 5, 2015 by john5

science
What best accounts for the retreating of a waterfall? Only one answer is right 1) meandering stream action 2) erosion of the stream bed
Thursday, November 5, 2015 by john5

Science/Math
If the air temperature is 30 degrees C and the relative humidity is 60%, will the dew point be reached if the temperature drops to 25 degrees C? I know that the formula is x = .60(37g/m cubed.)
Thursday, November 5, 2015 by Zoe

Science - Mercury
So I'm in the middle of working on a science portfolio and it says: How will you overcome these challenges with the design of your spacecraft? you see I'm planning my own mission to space and I'm traveling to mercury, but I don't know how my spacecraft should ...
Thursday, November 5, 2015 by Areana

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