Saturday
December 3, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

Science chemestry
calculate the average rate of a reaction. He placed 10.00 g piece of aluminium into 6.0 M HCl. After 20 s. he found that 4.50 g of unreacted magnesium remained. Calculate the average rate at which magnesium was consumed by the acid. #not I really do not understand the ...
Monday, April 11, 2016 by Sisanda mkhwanazi

Science
I want answer for force at a distance examples
Monday, April 11, 2016 by Priyamvada

Science
Starting with 100 grams of uranium-238, after one half life has gone by, how many grams of uranium-238 will remain?
Monday, April 11, 2016 by Lamont Sanders

Science
Calculate the number of g-atoms in 3.5g nitrogen
Monday, April 11, 2016 by Anonymous

Science
You observed light passing through lenses and through a set of prisms. Why does refraction occur? Include your lab observations in your answer. Respond to at least two other posts and evaluate the thoroughness and accuracy of each response. Can you please explain this or break...
Sunday, April 10, 2016 by Anastasia

science
Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? A: photosphere B: chromosphere * C: corona D: prominence
Sunday, April 10, 2016 by daddy.

political science
One of the main differences in passing a bill is that the House has a _____ which the Senate does not. rule committee lower requirement for passage veto power fast-track committee its the veto power?
Sunday, April 10, 2016 by ryan

political science
Which of the following is NOT considered a critical election? William McKinley (1896) Theodore Roosevelt (1904) Abraham Lincoln (1860) Franklin Roosevelt (1932)
Sunday, April 10, 2016 by ryan

political science
As US ambassador to the United Nations, Samantha Power has what rank compared to other members of the executive administration? cabinet committee sub-committee sub-cabinet
Sunday, April 10, 2016 by ryan

political science
During the 2nd Party System in American politics, parties moved from a ______ in Congress to a _______ in order to pick candidates and develop a party platform. caucus; national convention informal poll; direct primary caucus; direct primary random selection; direct primary
Sunday, April 10, 2016 by ryan

science
What effect does green filter have on pink flowers??please help me now.I am waiting.thank you
Sunday, April 10, 2016 by anonymous

Science
A car is traveling 20m/s brakes and takes 3 s to stop.What is the acceleration in m/s
Sunday, April 10, 2016 by Breanna

science
If you place a green filter in front of a white light and shine it on a pink flower,what colour will it change into.what effect did the green filter have on the pink flower.Explain the reason for the change in colour..THANK YOU:-)
Sunday, April 10, 2016 by ?

science
Explain the reasons for the change in colours
Sunday, April 10, 2016 by ??????

science
What effect did the green filter have on the pink flower
Sunday, April 10, 2016 by unknown

science
a car with two passengers travelling at 15m/s collides with a tree. one of the passengers who is not wearing a seat belt strikes the windshield head first and comes to rest in 0.03 s. the area of contact between the head and the windshield is approximately 5 X 10 to the power ...
Sunday, April 10, 2016 by Christoper

physical science
When a rocket is 3km above the ground,it has an upward velocity of 10 m.s^-1.A booster rockect is fired downward,resulting in a net force of 6000 N being exerted upward on the shuttle.The time it takes the booster to leave the shuttle after being fired is 2,5 seconds.if the ...
Sunday, April 10, 2016 by jeniffer

Computer science
Is computer a system?
Sunday, April 10, 2016 by Noor

Science
Calculate the frequency of rotation of the second hand clock
Sunday, April 10, 2016 by Kenny

Science Please Help!!!
State how matter moves through the biosphere. State how energy moves through the biosphere. Explain each statement using examples to illustrate your explanation. What are some examples of each way of movement through the biosphere? Can someone please help??? Thanks! (=
Saturday, April 9, 2016 by Scarlet

Science
A fossil for an extinct organism is found in layer B. A fossil for another extinct organism, very similar to the first, is found in layer C. What might be the relationship between these two organisms. Im so confused, can someone help.
Saturday, April 9, 2016 by Amie

Math, science
in 2009 an earthquake of magnitude 6.7 shook the kermadec islands off the coast of new zealand. also in 2009 an earthquake of magnitude 5.1 occured in the alaska peninsula. How many times stronger was the kermadec earthquake. Use formula log (I1/I2)=m1-m2 A.39.811 B.20.593 C.5...
Saturday, April 9, 2016 by Student

maths,science,agriculture
What requirements are going to be needed for studying VET at tertiary institution
Saturday, April 9, 2016 by kgaugelo

science
need to make a silent proof box 15,000 cubic centimeters. What is the dimensions? I am having a hard time figuring it out.
Saturday, April 9, 2016 by krystal

Science
Two pellets, each with a charge of 1.5 microcoulomb (1.5×10−6 C ), are located 2.8 cm (2.8×10−2 m ) apart. Part A Find the electric force between them.Part B What would be the mass of an object that would experience this same force in Earth's ...
Saturday, April 9, 2016 by Rachel

math, science, hindi, english, sst
In triangle ABC, AB=4cm, AC=8cm and AM=3cm. AM is the median which meets BC and M. Then, BC is equal to
Saturday, April 9, 2016 by ujjwal

Maths Lit,English Fal,IsiZulu,L.o,Agricultural science,Geography,Life science
wich university i could fit in with this subject? and how many point do i need?
Saturday, April 9, 2016 by sbonelo

physical science
A car starts from rest and accelerates uniformly for 250 meters. It then moves with a constant velocity for 500 meters and slows down to rest in 300 meters. The whole trip takes 50 seconds. How long did the car move at constant velocity?
Saturday, April 9, 2016 by zinhle

Physical Science
Please check my answer!! I would be great if you could explain this to me a little as well... To find the amplitude, measure_____ a. the horizontal distance between consecutive positions b. the horizontal distance between a consecutive crest and trough c. vertical distance ...
Friday, April 8, 2016 by Becca

Science
What is one condition that is necessary for a hurricane to form? Warm Ocean Water A strong Cold Front Cold ocean Water A strong warm front I think it's C but I want to make sure...
Friday, April 8, 2016 by random person who probly takes the same class as you

Science Please help ASAP
which geologic feature is most likely to form at a mid-ocean ridge? Peninsula Volcano Delta Plateau Thanks!
Friday, April 8, 2016 by random person who probly takes the same class as you

Science
A chemistry teacher needs to prepare 750 ml of a 2.5M solution of Potassium iodide for a lab. How many grams of potassium iodide will be needed to make the solution?
Friday, April 8, 2016 by Ane

Science
potassium metal reacts with water to give potassium hydroxide and hydrogen gas How to balance this equation with proper steps?
Friday, April 8, 2016 by Rohan

science
a rectangular piece of wood measuring 20cm by5cm by3cm weighs 900kg.find the greatest pressure the piece of wood can exert if placed on a table
Friday, April 8, 2016 by Dominic

Pure Science
What Happens(in terms of floatation and sinking )When A Solid Object e.g a stone is placed in a liquid like water if they both have equal densities?
Thursday, April 7, 2016 by Ackron.Z

science
What does the surface temperature of the water affect?
Thursday, April 7, 2016 by Nina

science
according to wegeners hypothesis of continental drift ? A. Earths surface B. The continents C. Earth is slowly cooling and shrinking D. The continents joined
Thursday, April 7, 2016 by Xxoreo_~chan_xX

science
describe the function of each of the above organelles. in addition, compare each organelle to something else (examples: the nucleus is like a boss because both are in control of something larger
Thursday, April 7, 2016 by cristina

Science
Which of the following can be expected to occur as climate change continues on Earth? A. Decreased melting of sea ice B. Decreased migration of pests and pathogens*** C. Increased freshwater sources D. Increased coastal flooding
Thursday, April 7, 2016 by Dylan

science
if sulfur is in excess then production of 2 moles of ferrous sulfide requires how many gram of iron?
Thursday, April 7, 2016 by tanzila

Science
What are the basic points of Lewis and langmiur theory of electrovalency
Thursday, April 7, 2016 by Lunathi

science
a 600 g pool ball moving at 2.0m/s hits a second pool of the same mass at rest. the first ball moves off at 1.5m/s at an angle of 30 degrees from the original direction. assume the surface of the pool table to b frictionless find the angle at which the second ball moves off ...
Thursday, April 7, 2016 by hope

Chemistry of Life Science
1. In the introduction to this experiment, it states that you reacted 2.5 grams of salicylic acid with an excess of acetic anhydride, meaning that there would be a higher number of moles of acetic anhydride then salicylic acid, proportionally. Assuming the density of acetic ...
Wednesday, April 6, 2016 by Tracy

math
In a science experiment, the temperature of a substance is changed from 42 degrees Fahrenheit to -54 degrees Fahrenheit at an average rate of -12 degrees per hour. Over how many hours does the change take place?
Wednesday, April 6, 2016 by Anonymous

science (9th grade)
A form of 18 karat white gold contains 75% gold and 25% palladium. What type of solution is this? Specify which element is the solute and which is the solvent. help???
Wednesday, April 6, 2016 by tim

Science
Why is a gas able to flow? It's particles have melted and can move around. It's particles have high viscosity and can move around. It's particles have enough energy to move around. It's particles have enough pressure to move around.** not sure of the answer. ...
Wednesday, April 6, 2016 by Sally

science
apparent change in wavelength of sound waves is 2.5cm when the source of sound is approaching stationary listener with velocity 8cm/s.
Wednesday, April 6, 2016 by hussain

Science
What is anything that has mass and takes up space? 1) Weight 2) Volume 3) Density 4) Matter When you measure the boiling point of mercury, you are investigating a ____. 1) Chemical change 2) Chemical property 3) Physical change 4) Physical property Ab object weighing 90 N has ...
Wednesday, April 6, 2016 by Lulu

science
7, 2g of sodium carbonate, Na2Co3.nH2O is strongly heated and a residue of 2.7g are produced..... Calculate the nber of moles of water
Wednesday, April 6, 2016 by placide

Science
Hi do you guys know Lesson 2: Natural Selection Unit 3: Natural Selection and Adaptation in connexus 7th grade the portfolio. please I need help
Wednesday, April 6, 2016 by Subhan Hassan

math,science,tourism,geography
First option i want to be a social worker.sec option to be a police.last option is be a tourism management. Where do i go to further my study and what are the reguirement for this courses?
Wednesday, April 6, 2016 by nancy

Science PLZ HELP NOW!
hi,can someone check my science work...and please label like this 1.right 2.wrong thank you 1.which of the following could be true of two different species that have a competive relationship in the same ecosystem? A.one species preys on the other B .the relationship is ...
Wednesday, April 6, 2016 by IceLady900

science
apparent change in wavelength of sound waves is 2.5cm when the source of sound is approaching stationary listener with velocity 8cm/s.Apparent decrease in the frequency of source when observer recedes from the same source at rest with a velocity of 30m/s is (velocity of sound...
Wednesday, April 6, 2016 by hussain

science:chemistry
magnesium trioxocarbonate (IV) decomposed according to the equation MgCO3(s) -MgO2(s) + CO2(g).if 6.0g of magnesium trioxocarbonate (IV) is completely decomposed ,calculate :i. the mass of carbon (IV) oxide produced
Wednesday, April 6, 2016 by michael

Science
If you find a mysterious organism, how can you figure out whether or not it is a plant?
Tuesday, April 5, 2016 by Anonymous

science
Rocky (terrestrial) refers to the
Tuesday, April 5, 2016 by Zamya

science help pls pls
Which of the following is a myth about water conservation? An important part of water conservation is preventing water pollution. Buying bottled water conserves more water than drinking from the tap. Air-drying clothes conserves more water than using an electric clothes dryer...
Tuesday, April 5, 2016 by Oscar

science help pls pls
Which of the following best explains how water conservation can reduce waterborne diseases in a community? More people will have clean water to drink and bathe in. More people will drink bottled water imported from faraway springs. More people will be encouraged to visit the ...
Tuesday, April 5, 2016 by Oscar

science
im doing a powerpoint on valleys and i need some facts if there some websites you can send me too that wood be graet
Tuesday, April 5, 2016 by little dark one

science
What is the density of a copper sample that has a mass 90.0g and volume of 10g
Tuesday, April 5, 2016 by Leslie lopez

Science
Compare renewable and nonrenewable energy sources, and discuss the effects of each on biodiversity.
Tuesday, April 5, 2016 by really

body science
I have to do this for an open ended question on my unit test and i am not sure if i did it right can you please check my answers? It is fill in the blank. And the choices are: Arteries,Artium,Body,Carbon Dioxide,Lungs,Veins,Ventricle. You may youse these words more than once. ...
Tuesday, April 5, 2016 by Stacie

Science
what volume of air containing 20% O2 will be required to burn completely 10cm3 each of methane and acetylene?
Tuesday, April 5, 2016 by Susmita

science
A pistol that fires a signal flare gives the flare an initial speed of 180m/s. Air resistance is ignored. (a)If the flare is fired at an angle of 55° above the horizontal, what is the horizontal range? (b)If the flare is fired at the same angle over the flat of sea ...
Tuesday, April 5, 2016 by Gibson

Science
.a sodium atom has the following distribution of electrons in its energy cells: shell1: 2 electrons shell2: 8 electrons shell3: 1 electron I think its shell 2
Monday, April 4, 2016 by Benny f

science
density of gold is 19.32 g/cm^3.A piece of gold leaf is 2.50 cm on each side and 0.100 mm thick,How many atoms of gold are in this piece of gold leaf?
Monday, April 4, 2016 by Anonymous

Science
If you find a mysterious organism, how can you figure out whether or not it is a plant?
Monday, April 4, 2016 by Light

Science
Is all light energy Solar energy?
Monday, April 4, 2016 by Anonymous

science
why does nicotine make it difficult for a smoker to quit using cigarettes it helps with weight loss for for many people it makes people sleep long hours many people experience intense headaches the cost of nicotine is very affordable for teens
Monday, April 4, 2016 by little dark one

Science
Why do scientists study images made with parts of the electromagnetic spectrum other than visible light? A)These images are the only way to observe galaxies beyond our own. B)These images reveal information that visible light does not show. C)These images show important data ...
Monday, April 4, 2016 by Cam

Science
Refracting telescopes use lenses. Reflecting telescopes use mirrors. However, both types of telescopes have something in common. How are both types of telescopes similar? A)They both magnify tiny nearby objects. B)They both reflect light that enters the telescope. C)They both ...
Monday, April 4, 2016 by Mark

Science
Karen is studying types of spacecraft. Which of these spacecraft can people use to travel to and from orbits close to Earth? A)space probe B)space shuttle C)space station D)space telescope I think the answer is C.
Monday, April 4, 2016 by Grady

Science
What is the best explanation for why scientific theories are modified? A)Theories more than ten years old are usually out of date. B)Scientists want to prove that the work of other scientists is wrong. C)New evidence that supports a revision prompts scientists to modify the ...
Monday, April 4, 2016 by Gaby

Science
PLEASE HELP 1. Katie is bowling. She starts with the ball in her right hand and her arm as far back as it will go. She swings the ball forward, applying a force of 78 Newtons the whole time. When her hand has traveled through a path of 0.9 meters, she releases the ball, and it...
Monday, April 4, 2016 by Alex

Science
A boat moves at a speed of 15 km/h in still water. The river it is traveling in flows at a rate of 3 km/h downstream. What is the velocity of the boat if it travels downstream? What is the velocity of the boat if it travels upstream?
Monday, April 4, 2016 by Ryan

Science
The compound KCIO3 decomposes according to the following equation 2KCIO3- 2KCI + 3O2
Monday, April 4, 2016 by Ophelia

science
The reaction H 2 CO 3 + H 2 O ↔ H 3 O + + HCO 3 – takes place in water. What happens to the equilibrium when the pressure is increased ? A-It favors formation of reactants. B-It favors formation of products. C-It does not change. *** D- It is conserved.
Monday, April 4, 2016 by Macarena

Engineering science
2. A wooden block slides directly down an inclined plane, at a constant velocity of 6 m/s. a. How large is the coefficient of kinetic friction if the plane makes an angle of 25 degrees with the horizontal? b. If the angle of incline is changed to 10º, how long far will ...
Monday, April 4, 2016 by Bombwe

Science
which of the following statements best describes the energy of a waterfall? A) The water has Kinetic energy because of its position at the top of the water fall B)potential Energy changes to Kinetic Energy as the waterfalls. C)kinetic energy changes to potential energy as the ...
Sunday, April 3, 2016 by Benny f

science help PLS
Which of the following is a sign of poor quality water? Zero turbidity A pH of 7.0 High phosphate content High dissolved oxygen
Sunday, April 3, 2016 by Oscar

science help pls pls
Which of the following is typically associated with a large amount of organic material in a water supply? Lower turbidity Higher phosphates Fecal coliform High dissolved oxygen is it c pls help
Sunday, April 3, 2016 by Oscar

science
Magnesium can react with aqueous nitric acid, HNO3, to form hydrogen gas and magnesium nitrate. Write down the balanced chemical equation for this reaction, remembering to use the state symbols.
Sunday, April 3, 2016 by ecquation

Physical science 7th grade
What is the internal structure of the cavefish and the minnow suggest common ancestry?
Saturday, April 2, 2016 by Michael

science
the mean weight of 500 males students at a certain college is 151 lb and standard deviation is 15lb .assuming the weights are normally distributed, find how many students weigh between 120 and 155 lb ..ii) more than 185 lb
Saturday, April 2, 2016 by Ados

computer science
how to write c++ program to compute to display natural number between 1 and 30 which are divisible by 12
Saturday, April 2, 2016 by wondu

Computer science
Is computer a system?
Saturday, April 2, 2016 by Noor

Science
A transformer with 1890 turns in its primary coil has to decrease the voltage from 4620 V to 220 V for home use. How many turns should there be on the secondary coil?
Friday, April 1, 2016 by Brian

science
How do everyday activities like driving a car and using electricity led to global warming?
Friday, April 1, 2016 by Gabby

maths lit, life science,History,English,Afrikaans,
I want to become an astronomer so I was wondering if it's possible to study for one or wht help me plz ???
Friday, April 1, 2016 by Angela

SCIENCE
HOW MANY TERMS OF GP 1,2,4,8..... GIVE A SUM GREATER THAN 500.
Friday, April 1, 2016 by ENOCH

science
calculate the velocity of a car increases from 54km 1hr to 72 km/hr if the mass of the car is 1500kg find the work done to increase the velocity
Thursday, March 31, 2016 by sejal

Science
What is the relationship between number of loops on an electromagnet and the strength of the magnet? Can you help e or break this down for me please? @Ms.Sue thank you
Thursday, March 31, 2016 by Anastasia

Science
Provide three statements that demonstrate the importance of units when describing motion. (3 points) Can anyone help me with this? I don't understand what they want
Thursday, March 31, 2016 by icebreaker

Science
The ratio of numbers of moles of butane to the number of moles of oxygen necessary for a complete of butane is
Thursday, March 31, 2016 by Darshan

science
If you had 100 mL of juice, how many milliliters would be fruit juice?
Thursday, March 31, 2016 by Lizeth

science
4.which of these statements best describes the relationship difference between minerals and rocks. 1.most minerals are made of rocks. 2.most rocks are made of minerals. 3.rocks are solid but minerals are not. 4.rocks are found on earths surface but minerals are not.
Thursday, March 31, 2016 by Destiny

Maths, life science,business studies, EGD, LO and
Which career to choose with these subjects done in matric
Thursday, March 31, 2016 by Phindile

Science
Meta and para isomers are more soluble in water than ortho isomer?
Thursday, March 31, 2016 by Tenzin

Science
If a car traveled a total of 300 km in 4 hours what is the average speed
Thursday, March 31, 2016 by Anonymous

Science
The water in a puddle has a mass of 1500 grams. The sun comes out and the puddle evaporates. How many grams of water vapor enter the air from the puddle?
Thursday, March 31, 2016 by Taylor

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