Friday
July 29, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

SCIENCE check answers please :)
1) Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA). What was this particular time period called, and why is this time period not really considered a part of Earth’s ...
Tuesday, November 17, 2015 by Cami

HELP SCIENCE
how the volume of air in a tank of compressed air would change if the volume of the tank doubled?
Tuesday, November 17, 2015 by John Doswell

science
how the volume of air in a tank of compressed air would change if the volume of the tank doubled?
Tuesday, November 17, 2015 by John Doswell

Science
Tellurium is a metalloid. How many valence electrons does tellurium have? 3 4 5 6
Tuesday, November 17, 2015 by Sara

Science
Which of the following shows three elements in order of increasing conductivity? Ge, O, Mn O, Ge, Mn Mn, O, Ge Mn, Ge, O
Tuesday, November 17, 2015 by Sara

Science
Inner transition metals are composed of which of the following? metals lanthanides and actinides halogens noble gases
Tuesday, November 17, 2015 by Sara

Science
Which of the following is a characteristic of nonmetals? Nonmetals are often brittle solids. Nonmetals are often malleable. Nonmetals often conduct electricity. Nonmetals are often ductile.
Tuesday, November 17, 2015 by Sara

Math
Samantha has homework in five subjects tonight. She has 15 minutes of science, 20 minutes of math, 30 minutes of reading, 20 minutes of writing, and 15 minutes of geography. If her mom walked in randomly while she was doing her homework, what subject would she most likely see ...
Tuesday, November 17, 2015 by Anonymous

science
What is the molecular formula of Ethanoic acid?
Tuesday, November 17, 2015 by tshegofatso

Career
There are two types of bachelors' degrees, a Bachelor of Art or a Bachelor of Science. True False***
Tuesday, November 17, 2015 by Labbayk

Science
How do the circulatory system and the endocrine system interact in helping to maintain homeostasis in humans? A. The endocrine system produces hormones that are transported by the circulatory system to target cells when changes are needed. B. The circulatory system provides a ...
Tuesday, November 17, 2015 by Anonymous

Science
A 5.0 kg rock is dropped from the top of a building the speed of the rock after it has fallen for 4.2 seconds is _______meter per second
Tuesday, November 17, 2015 by Laci

Science
An engineer messed design a runway to accommodate airplanes that must reach a speed of 71 m/s before they can take off the planes are capable of accelerating at a rate of 1.6 m/s person per second the minimum length of the runway must be _______
Tuesday, November 17, 2015 by Laci

science
A 2.1kg soccer ball is struck with a 45N force for .3 seconds. What is the Frictional force if the ball rolls for 11 seconds before stopping.
Monday, November 16, 2015 by jenn

Science-physics
A ball is thrown horizontally from the top of a building 37.5 m high. The ball strikes the ground at a point 80.3 m from the base of the building. The acceleration of gravity is 9.8 m/s 2 . Find the time the ball is in motion. Answer in units of s.
Monday, November 16, 2015 by Maggie

Science
Which of the following gases was most likely present in Earth's earliest atmosphere? A. nitrogen B. hydrogen* C. argon D. oxygen Which of the following statements accurately describes the development of the geologic time scale? A. Scientists developed the geologic time ...
Monday, November 16, 2015 by Anonymous

Math
In science class, Savannah measures the temperature of a liquid to be 50^@ Celsius. Her teacher wants her to convert the temperature to degrees Fahrenheit. What is the temperature of Savannah's liquid to the nearest degree Fahrenheit?
Monday, November 16, 2015 by Claire

Science CHECK ANSWERS PLZ
Which of the following gases was most likely present in Earth's earliest atmosphere? A. nitrogen B. hydrogen* C. argon D. oxygen Which of the following statements accurately describes the development of the geologic time scale? A. Scientists developed the geologic time ...
Monday, November 16, 2015 by Anonymous

Science Please Help!!!
1) Which of the following is not a function of the human nervous system? A. regulating heartbeat B. listening to music C. moving oxygen from air into the blood D. signaling the diaphragm to contract 2) An external event stimulates a sensory nerve, which transmits a signal to ...
Monday, November 16, 2015 by Sammy

Science
I really need help with my science test please , let me know the answers to the following questions.:|) On Earths history unit test Lesson 9 for connections academy . Plz and thank you .
Monday, November 16, 2015 by SeCondra

science
Calculate percentage concentration of a solution obtained after dissolving: - 12 g of KCl in 150 g of water
Monday, November 16, 2015 by mustafa

science
a fighter plane dives straight down with an acceleration of 3g . what is the magnitude and direction of pilot's effective (or apparent) weight if his real weight is w?
Monday, November 16, 2015 by soni

Science: Chemistry
How many kilojoules are released when 115 g of Si reacts with chlorine? Si(s)+2Cl2(g)→SiCl4(g)ΔH=W​22;657kJ
Sunday, November 15, 2015 by Alex

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

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