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October 24, 2014

Homework Help: Science

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Recent Science Questions

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science
liquid alcohol will change to vapor when its temperature reaches the A. boiling point B. fusing point C. freezing point D. melting point
Thursday, January 30, 2014 at 2:07pm

Science
Does ΔT from evaportation increase or decrease with increasing molecular mass? Explain why?
Thursday, January 30, 2014 at 2:07pm

Science
Predict change in temperature for 1-butanol, CHSCH2CH2CH2OH, if same experiment were using 1-butanol?
Thursday, January 30, 2014 at 2:07pm

Science
Using concept of Surface Tension, explain why does the detergent cause the effect observed?
Thursday, January 30, 2014 at 2:05pm

Science
Explain why pentane has a significantly higher vapor pressure than 1-butanol?
Thursday, January 30, 2014 at 2:02pm

science
a silver bar 0.125 meter long is subjected to a temperature change from 2oo degrees celsius to 100 degrees Celsius what will the length of the bar be after the temperature change
Thursday, January 30, 2014 at 1:59pm

science
If the absolute temperature of gas is 600K, the temperature in degrees celsius is A.273 b.705c
Thursday, January 30, 2014 at 1:51pm

science --- check my answers!
help pls asap!!!!! check my answers!!! 4.) A certain object has a volume of 25.0 mL and a mass of 100g. What is the density of the object? a)0.250 g/mL b) 4.00/mL*** c)125 g/mL d) 2500 g/mL 5.)Which of the following is a chemical property of aluminum? a)The melting point of ...
Thursday, January 30, 2014 at 1:22pm

Science-check my answers plz
Which of the following explains why sunlight is important to aquatic ecosystems? Sunlight provides a source of heat energy to increase water temperatures. Sunlight keeps harmful bacteria from taking over aquatic ecosystems. Sunlight makes it possible for aquatic predators to ...
Thursday, January 30, 2014 at 12:47pm

Science
What is the mass of water that results from combining 2.0 g of hydrogen with 16.0 g of oxygen? 14.0 g (I'm thinking this.) 16.0 g 18.0 g 20.0 g
Thursday, January 30, 2014 at 11:36am

Science
a__has a definite shape and a definite volume
Thursday, January 30, 2014 at 10:29am

science
Ship made of iron doesn't sinks but iron nail sinks. Why?
Thursday, January 30, 2014 at 7:23am

Engineering science N4
Calculate the angle of projection of a projectile in order to hit a target 12km away.the initial velocity is 700m/s ant the time of the flight is 80seconds.
Thursday, January 30, 2014 at 4:57am

Engineering science N4
A ship is 100km north-west of cape town harbour and it sails directly north at a velocity of 30km/h in 8 hours.calculate its resultant speed with reference to the cape town harbour in magnitude and direction.
Thursday, January 30, 2014 at 4:52am

science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
Thursday, January 30, 2014 at 2:49am

science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
Thursday, January 30, 2014 at 2:48am

Science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
Thursday, January 30, 2014 at 2:47am

Science - Disproven Genetic Theory
What genetic theory has been disproven ?
Wednesday, January 29, 2014 at 8:54pm

physical science
How much time is needed for a car to accelerate from 8.0 m/s to speed of 22 m/s if the acceleration is 3.0 m/s^2?
Wednesday, January 29, 2014 at 8:54pm

science
Carbon dioxide is obtained from the air and changed into carbohydrates and oxygen during the process of A) fossilization. B) respiration. C) digestion. D) photosynthesis
Wednesday, January 29, 2014 at 8:53pm

science
Granite is an igneous rock that forms from magma cooled below Earth's surface.Why would granite have larger crystals than igneous rocks formed from lava cooled above Earth's surface?
Wednesday, January 29, 2014 at 8:41pm

Science ~ Structures and Properties of Matter
How do the principles of convection, conduction, and radiation explain how the water in the saucepan gets hot? Help ME PLEASE! PLEASE
Wednesday, January 29, 2014 at 8:16pm

math
the ratio to the number of mystery books to the number of science fiction books is 4:3 the ratio of the number of science fiction books to the number of biographies is 4:5 if there are 48 science fiction books, find the total number of books using bar model
Wednesday, January 29, 2014 at 7:50pm

Science
1. The combination of sulfur dioxide, nitrogen oxide, and atmospheric moisture creates A. drinking water. B. smog. C. pesticides. D. acid rain. D? 2. Another name for unicellular organisms that dominated Earth up to the Precambrian time is A. eukaryotes. B. cyanobacteria. C. ...
Wednesday, January 29, 2014 at 7:23pm

Physical Science
How does the potential energy of an object change when its height is tripled?
Wednesday, January 29, 2014 at 6:20pm

Environmental Science
An effective approach to preventing future shortages of usable water should focus on?
Wednesday, January 29, 2014 at 3:15pm

science(1answer)
4.how does the kinectic energy of a 10,000-kg train traveling at a speed of 10 m/s compare with that of a 2,600-kg compact car traveling twice as fast? A.the train has less kinectic energy than the car. B.the train has more kinectic energy than the car.(I PICK THIS) C.the ...
Wednesday, January 29, 2014 at 1:37pm

Science
A ball is thrown upward at 20 metres per second off the top of a building that is 12 m high. What is the height of the ball above the ground at its highest poin?
Wednesday, January 29, 2014 at 1:15pm

science (check answers)
4.how does the kinectic energy of a 10,000-kg train traveling at a speed of 10 m/s compare with that of a 2,600-kg compact car traveling twice as fast? A.the train has less kinectic energy than the car. B.the train has more kinectic energy than the car.(I PICK THIS) C.the ...
Wednesday, January 29, 2014 at 12:53pm

science(check answers)
2.how would the kinetic energy of a 12,000-kg train compare with the kinectic energy of a 900-kg compact car if both were traveling at the same speed? A.the trains kinectic energy would be equal to the cars kinectic energy. B.the trains kinectic energy would be greater than ...
Wednesday, January 29, 2014 at 12:37pm

science(check answers)
1. A 60-kg cheetah reaches a speed of 30 m/s as it chases its prey.What is the kinetic energy of the cheetah? A.900 j B. 1,800 j C.27,000 j D. 54,000 j
Wednesday, January 29, 2014 at 12:15pm

Science
1. Which of the following is true about mixtures? (1 point) Mixtures consist of two or more substances chemically combined. Mixtures cannot be separated by physical means. Mixtures consist of only one kind of atom. ***Mixtures have two or more substances mixed together, but ...
Wednesday, January 29, 2014 at 11:18am

Maths lit,geo,science,l.o,life science,eng
Im doing those subjects and i would like you guys to help me out...what carrer can i do...im a matriculant im so stressed
Wednesday, January 29, 2014 at 10:00am

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...
Tuesday, January 28, 2014 at 11:31pm

SCIENCE
are these magnetsattracting or repelling each other?how can you tell
Tuesday, January 28, 2014 at 10:29pm

Science
43Lb has a half life of 42 minutes. If you start with 100 grams, how many grams will you have after 84 minutes?
Tuesday, January 28, 2014 at 8:05pm

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 ...
Tuesday, January 28, 2014 at 7:41pm

Science
Think of 5 adaptations for a made up animal in an aquatic environment
Tuesday, January 28, 2014 at 6:57pm

computer Science
20 You are trying to boot your computer but your computer keeps displaying a message after the POST that says “'invalid specification”. What does the error mean?” a. an attempt to overclock the primary drive has failed...
Tuesday, January 28, 2014 at 4:43pm

computer Science
18 You started your new job as a PC tech and are at a customer’s house. The computer has failed to boot. The fan is running but the POST fails every time. What is the best thing to do to possibly find quickly? a. Check the electrical outlet the computer is ...
Tuesday, January 28, 2014 at 4:42pm

Science ~ Structures and Properties of Matter
1) Both carbon dioxide and water are pure substances. How are they similar to each other? A. both substances have a set ratio of atoms that cannot be separated by physical means. B. both substances have a set ratio of atoms that can be separated by physical means. C. both ...
Tuesday, January 28, 2014 at 4:12pm

science ~CHECK MY WORK PLEASE~
1) Both carbon dioxide and water are pure substances. How are they similar to each other? A. both substances have a set ratio of atoms that cannot be separated by physical means. B. both substances have a set ratio of atoms that can be separated by physical means. C. both ...
Tuesday, January 28, 2014 at 3:41pm

Science ~CHECK MY WORK PLEASE~
Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water? A. He decreased the density by increasing the volume. B. He decreased the ...
Tuesday, January 28, 2014 at 3:24pm

Science ~CHECK MY WORK PLEASE~
Both carbon dioxide and water are pure substances. How are they similar to each other? A.) both substances have a set ratio of atoms that cannot be separated by physical means. B.) both substances have a set ratio of atoms that can be separated by physical means. C.) both ...
Tuesday, January 28, 2014 at 3:21pm

science---1 question
help pls asap! 2) Which of the following is a pure substance? (1point) Chocolate milk Orange juice Seawater Hydrogen peroxide (H2O2) i first thought it was C (seawater) but is it D (H2O2)!??
Tuesday, January 28, 2014 at 3:05pm

Physical Science
A machine you designed has an efficiency of 60%. What happens to 60% of the work put into the machine, and what happens to the other 40%?
Tuesday, January 28, 2014 at 2:55pm

science
a framed painting weighs 220 newtons. the 2 wires support an angle of 120 degrees with each other. what are the tensions on the wire?
Tuesday, January 28, 2014 at 2:44pm

EARTH SCIENCE- SO STUCK
How far from an earthquake epicenter is a city where the difference between the P-wave and the S-wave arrival times is 5 minutes and 00 seconds?
Tuesday, January 28, 2014 at 1:41pm

Science
Which of the following is disadvantage of internal fertilization? A. Gametes are released into the surroundings. B. Gametes may get washed away. C. The developing zygote is protected. D. Larger numbers of eggs can be fertilized at one time
Tuesday, January 28, 2014 at 1:08pm

Physical science
State the mathematical relationship between the net force acting on an object and the time taken to change the objects momentum
Tuesday, January 28, 2014 at 12:55pm

Science
A male peacock displays his colorful tail in order to...... A. increase the success rate of asexual reproduction B. increase the gestation period. C. release gametes into his surroundings D. attract a mate
Tuesday, January 28, 2014 at 12:52pm

Science
A 15.3 kg object is dropped from an initial height of 33.5m above the ground. Find the speed when it hits the ground.
Tuesday, January 28, 2014 at 12:47pm

Science
Seahorses change color and swim together in predetermined ways before mating. The behaviors are called....... A.asexual reproduction. B. sexual reproduction. C. courtship rituals. D. budding.
Tuesday, January 28, 2014 at 12:28pm

Science
Which era of geologic time was the longest? HOLOCENE PLEISTOCENE PLIOCENE MIOCENE OLIGOCENE EOCENE PALEOCENE
Tuesday, January 28, 2014 at 12:19pm

Science
Some animals, but not humans, have an organ called a gizzard located near the top of their digestive tract. This organ is small and can contain small rocks. It also has thick, muscular walls. Based on this physical description, which of the following is most likely to be the ...
Tuesday, January 28, 2014 at 12:41am

Science: Discovering Magnetism
How is the strength of two magnetic poles related to the force between them?
Monday, January 27, 2014 at 11:58pm

Science
Why do you think the national weather service has standard conditions for measuring air temperature?
Monday, January 27, 2014 at 9:41pm

science
joey drives his car 7 kilometers north. he stops for lunch and then drives 5 kilometers south. what distance did he cover?
Monday, January 27, 2014 at 7:32pm

Science: Bird Project
I'm doing a project about the Northern Oriole. It's a mini project. What's the difference between the Northern Oriole and the Baltimore Oriole?
Monday, January 27, 2014 at 7:11pm

Physical Science
A 50.0-kg wolf is running at 10.0 m/sec. What is the wolf's kinetic energy? A) 5 J B) 500 J C) 5000 J D) 250 J E) 2500 J
Monday, January 27, 2014 at 4:07pm

Science
a 67 gram chunk of ice (Heat of Fusion = 6.0 kJ/mol) in a beaker immersed in a water bath. To produce just enough heat to melt the ice, how many moles of solid NaOH (Heat of Solution = -445.1 kJ/mol) must be added to this system to just melt the ice. (Moles)
Monday, January 27, 2014 at 3:58pm

gifted talented science
pls, help! this is hard and confusing! 1. How does runoff affect a community? (1 point) Runoff can supply new homes and businesses with the water that they need. Runoff can provide the water that fish in streams and lakes rely on. Runoff can prevent streams and lakes from ...
Monday, January 27, 2014 at 10:13am

science
The electric field 1.5 cm from a very small charged object points toward the object with a magnitude of 180,000 N/C. What is the charge on the object?
Sunday, January 26, 2014 at 11:18pm

science
The figure shows two unequal point charges, q and Q, of opposite sign. Charge Q has greater magnitude than charge q. In which of the regions X, Y, Z will there be a point at which the net electric field due to these two charges is zero?
Sunday, January 26, 2014 at 11:17pm

Science~!!!
Why does a thrown football have both potential and kinetic energy? What is the combined energy called? How do the principles of convection, conduction, and radiation explain how the water in a saucepan gets hot?
Sunday, January 26, 2014 at 8:50pm

Science
Unscramble these letters to make a sentence about stress. Eeoiieooaelnfrntssrsszrtgngcs
Sunday, January 26, 2014 at 7:56pm

Science
Two forces of 5 N and 7 N respectively act on an object when will the resultant of the two vectors be at a maximum?
Sunday, January 26, 2014 at 1:27pm

science
A car of mass 1500 kg accelerates up a hill of incline 8 degrees, increasing its speed from 4 ms to 16 ms over a distance of 90m. Assuming a total frictional resistance of 1000 N, calculte: a) the tractive effort between the wheels and the road surface b)the work done during ...
Sunday, January 26, 2014 at 11:28am

Science
True or false? Volcanic eruptions cause damage only when they are close to the crater's rim.
Sunday, January 26, 2014 at 10:53am

Science
A cannon ball is fired horizontally with a velocity of 50m/s from the top of a cliff 90m high,after how many seconds will it strike the plane at the foot of the cliff.at what distance from the foot of the cliff will it strike and with what velocity will it strike the ground.
Sunday, January 26, 2014 at 10:01am

Science
True or false? Volcanic eruptions cause damage only when they are close to the crater's rim.
Sunday, January 26, 2014 at 9:04am

Science
A solution is prepared by dissolving 38 g of H2S04 in 220 g water. If the density of the solution is 1.96 g/ml, find its: molality molarity mole fraction of the components of the solution normality This assignment is needed tomorrow. I really don't know the answer. I tried...
Sunday, January 26, 2014 at 8:17am

Science - 6th grade: CHECK MY ASNWER
Consider a wetland ecosystem similar to the one shown in the image below. In this ecosystem are two species: a small fish species and a wading bird species that feeds on the small fish as its main source of food. Oxygen levels are a limiting factor.Suppose that the local ...
Saturday, January 25, 2014 at 9:14pm

Science - 6th grade: CHECK MY ASNWER
If changing conditions lead to decreased oxygen levels in the stream, the carrying capacity of the stream for the trout will decrease. Oxygen level in water is therefore a(n) _____________ with respect to the number of trout that a particular stream can support. Is it "...
Saturday, January 25, 2014 at 8:32pm

Science - 6th grade
A biologist studying a desert ecosystem observes that the population of a lizard species increases following a particularly hot, dry period that causes a snake population to decline. What could the biologist hypothesize about the roles of these two species? A.The lizard preys ...
Saturday, January 25, 2014 at 7:54pm

Science
Melaine is tired all the time. No matter how much rest she gets and food she takes in she doesn't have energy. What is the organelle that is malfunctioning in her cells? Justify your answer.
Saturday, January 25, 2014 at 7:39pm

science
1. Which gas is a source of natural groundwater pollution? A. Carbon B. Oxygen C. Hydrogen D. Radon d? 2. A stream channel is formed when water A. carves a very deep and wide channel into rock. B. carries minerals into the ocean. C. creates a depression, which forms a lake. D...
Saturday, January 25, 2014 at 7:09pm

Science~!!!
1 When the air under the envelope is heated, the balloon lifts. Which of the following statements is true. a. Hot air balloons use radiation to rise b. Hot air balloons use conduction to rise c. hot air balloons use convection to rise d. hot air balloons use air resistance to ...
Saturday, January 25, 2014 at 7:06pm

Science
Is reintroducing a native predator species harmful to the local ecosystem? Why?
Saturday, January 25, 2014 at 4:22pm

science
hi I wanna know the safety precautions of using of lead
Saturday, January 25, 2014 at 3:36pm

EARTH SCIENCE
Cumulus and stratus clouds belong to which cloud group? A. Puffy clouds B. High clouds C. Middle clouds D. Low clouds Is it A? What is the basic cause of ocean tides? A. Gravitational force of volcanic activity B. Gravitational attraction between the Moon and the entire solar...
Saturday, January 25, 2014 at 11:12am

Maths literacy,life science,history,geography
I PASSED MATRIC ND I WAS DOING THESE SUBJECTS..I PASSED WITH DIPLOMA.....THIS WAS HOW I WORKED.....#MATHS LITERACY (LEVEL 3) #GEOGRAPHY(LEVEL 3) #HOME LANGUAGE(LEVEL 7) #ENGLISH(LEVEL6) #LO(LEVEL7) #LIFE SCIENCE(LEVEL3)#....I WANT TO KNW WHAT CAN I STUDY AT TUT OR AT COLLEGE.....
Saturday, January 25, 2014 at 9:53am

materials science engineering
Identify the [221] vector.(crystallographic directions qns) The answer given corresponds to 0.5 in x direction,0.5 in y and 1 in z. Why is it not [1 1 0.5], the simply reduced form. The ans is the reciprocal of [221], which puzzles me since this is not a plane.
Saturday, January 25, 2014 at 1:50am

10th grade Science
Explain, physiologically, how you would decide to use ice or heat on an injury? My book doesn't have any good info on this question. Is there a reputable website or article to get info to answer this question?
Friday, January 24, 2014 at 7:27pm

Science
Can someone please check my answers and if they are wrong can you help me fix them? Thank so much!! 1. Which of the following determines the strength of the force of gravity between two objects? Check all that apply. (2 points) the speeds of the objects the masses of the ...
Friday, January 24, 2014 at 1:08pm

science
Which statement best compares an atom to an ion? A.An ion is an atom that has lost its charge. B.An ion is an atom that has gained or lost protons. C.An ion is an atom that has gained or lost electrons. D.An ion is an atom that has a different number of neutrons.
Friday, January 24, 2014 at 11:43am

science
How do two isotopes of the same element compare with each other? A.They have the same number of protons but a different number of electrons. B.They have the same mass number but a different number of protons. C.They have the same mass number but a different number of neutrons...
Friday, January 24, 2014 at 11:43am

science
How can atoms of two elements that have a different number of protons have the same charge? A.by also having a different number of neutrons B.by also having a different number of electrons C.by having the same mass number D.by being the same size atoms
Friday, January 24, 2014 at 11:42am

science
How are all atoms of iron different from the atoms of all other elements? A.number of neutrons B.charge on the atoms C.mass number D.number of protons I guessed. I knew the answer. 123456789101112131415161718192021
Friday, January 24, 2014 at 10:47am

science
How are the atoms of two different elements always similar to each other? A.They react in the same way. B.They have the same number of neutrons. C.Electrons and protons orbit the neutrons. D.Electrons orbit the nucleus.
Friday, January 24, 2014 at 10:43am

Maths and science
In how many ways can a lift holding eight passenger carry a part of thirteen in two journey?
Friday, January 24, 2014 at 10:37am

Physical Science 9
What is the chemical equation for the rusting of iron carbide. I tried it myself,but I ended up with iron hydroxide rather than iron oxide. Help, Please, and thank you.
Friday, January 24, 2014 at 8:35am

science
A 1.92 × 103 kg car accelerates uniformly from rest to 12.4 m/s in 3.77 s. What is the work done on the car in this time interval?
Friday, January 24, 2014 at 7:49am

science
A 1.92 × 103 kg car accelerates uniformly from rest to 12.4 m/s in 3.77 s. What is the work done on the car in this time interval?
Friday, January 24, 2014 at 7:49am

Science
RNA is to U(Uracil) as DNA is to ? a. Cytosine (don't think so) b. Guanine (don't think so) c. Thymine d. Adenine
Friday, January 24, 2014 at 4:07am

Science
Which of the following functions like a fulcrum in a lever? A. tendons connecting muscle to bone at a joint. B. ligaments connecting bones at a joint. C. two muscles working as a pair to move a joint. D. two bones meeting at a joint. B or D?
Friday, January 24, 2014 at 12:41am

Science
Which of the following functions like a fulcrum in a lever? A. tendons connecting muscle to bone at a joint. B. ligaments connecting bones at a joint. C. two muscles working as a pair to move a joint. D. two bones meeting at a joint.
Thursday, January 23, 2014 at 10:40pm

Science??!!! :/
I don't get any of this, plz plz, explain these to me!! 1.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 ...
Thursday, January 23, 2014 at 10:38pm

science gr.8 science fair topic ideas
what are some ideas for science fair projects gr.8?!?! and please give an experiment with it thank u!!
Thursday, January 23, 2014 at 10:30pm

science
Explain why 100 percent solid bricks are special. Give examples.
Thursday, January 23, 2014 at 9:04pm

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