Science

Recent Questions

Science
A solution containing 3.22g of solute in 40.0g of 1,4-dichlorobenzene and its freezing point is 49.2 C. Calculate the molar mass of the solute.

science
1. Descriptive statistics are widely used in qualitative research. When establishing if a population is normally distributed explain when the statistics of sample size, mean, mode, median, skewness and kurtosis will guide the researcher to make conclusions of a normal ...

Science
What is the percentage composition of copper, Cu, in Cu20? A. 44% B. 80% C. 89% D. 133% I Choose C, Am I correct?

science
A ball with a mass of 3.47 kg is rolling along at 17.4 m/s. If you apply a force of 52.2 N to it, how many seconds will it take to stop?

science (cladogram)
How would a scientist use DNA or protein sequences from three different organisms to construct a cladogram?

science
What is the power of a 900 n force applied over a distance of 40 m for 45 sec?

science
the ratio of velocities of two object a and b is 1:3. if the position-time graph of object a is inclined to time axis at 30degree then the position-time graph of object b is inclined to time axis at

Science (theory of evolution)
How would a scientist use DNA or protein sequences taken from three different organisms to construct a cladogram.

Science
Assuming a warm front is moving into the area, there is a stignant (non moving) cold air mass around New York, what type of precipitation might be expect? How long might it last?

Science
If it is snowing in Great Neck, what type of air mass must be present?

Science
Why can cold air masses from Canada make it all the way down to the Gulf of Mexico?

Science
Describe what would happen if a positively charged sodium ion and a negatively charged chlorine ion came into contact?

science
What happens when a warm humid air mass meets a cold dry mass?

Science
Why are Canadians air masses considered to be dry air masses?

science
How would a scientist use DNA or protein sequences taken from three different organisms to construct a cladogram.

Science
If the volume of a balloon is 5.0 L at 22 degrees Celsius, what will be the new volume if the balloon is heated to 75 degrees Celsius? Should the volume increase or decrease? 5/22=x/75 x=17.045

Science
Which of the following describes the use of a renewable energy source? A. using natural gas to heat a house B. using a windmill to grind grain C. using petroleum to run a car D. using coal to generate electricity I think the answer is B.

Science (Physics)
A 33.3 kg cyclist is riding a 10.7 kg bicycle at a velocity of 7.0 m/s. If the cyclist applies a brake that applies a force of 42.7 N, what is the time required for the cyclist to come to a stop?

science
which of the following has the largest nos of oxygen atom. 1- 1 gm of oxygen atom 2- 1 gm o^2 3- 1 gm of ozone

Science
I need help with questions regarding information about the Galapagos Island volcano. 1. where is the volcano located 2. how long has it been active 3. what kind of volcano is it 4. is it dangerous 5. what is the surrounding area like 6. what else is there to do in the ...

science
Why does a light go out when you turn off the wall switch? A. The switch changes the direction of the flow of electrons. B. The switch causes a break in the circuit. C. The switch changes the circuit from series to parallel. D. The switch absorbs the electrical energy.

Science (theory of evolution)
How has the fossil record support the theory of evolution?

Science (theory of evolution)
How has the genetic code support the theory of evolution?

Science
What are some unexplained aspects of the future of fossil fuels and other energy?

science
what happens to insulin when kidney failure happens?

science
A ping pong ball and a penny are placed in water. The ping pong ball floats while the penny sinks? What property of water does this demonstrate? I think it has to do with the density. The reason the ping pong ball floats is because it has a lower density than the water. The ...

science
If A represents atomic mass and Z represents atomic number, which of the following describes an atom after a proton is emitted from its nucleus? A. A+ 1, Z + 1 B. A-1,Z-1 C. A+ 1, Z-1 D. A-1, Z + 1 My answer is B

earth science
_____ currents assist in the transfer of energy from warmer climates to cooler climates

4th grade Science (Please Help!)
Bowl A and Bowl B are filled with the same amount of water. Bowl A is covered in plastic wrap. Both bowls are left on a counter. The water level is checked in both bowls after 1 week. What is the independent variable? PLEASE HELP.

4th grade Science (Please Help!)
Bowl A and Bowl B are filled with the same amount of water. Bowl A is covered in plastic wrap. Both bowls are left on a counter. The water level is checked in both bowls after 1 week. What is the hypothesis? Please HELP!

Science
what is the combination of waves?

science
What are some scientific terms for metal rust

Science
When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? A. +2 B. -1 C. -2 D. +1

science
Plant-deer-tiger The first step in the energy chain that created the bonds of proteins in the tiger's muscle cells in the food chain shown above is A. deer the tiger ate B. plant the deer ate C. photons the sun made D. carbohydrates the plant made I think its A because by ...

science
Moths with certain coloring are camouflaged in their habitat. Over time, more moths are born with this coloring. Which of the following best explains the increasing number of moths with this coloring? A. Natural selection B. Gene flow C. genetic drift D. sexual selection I ...

Science
A spherical object made of stone is dropped into a container of water and sinks to the bottoms of the container causing 30N of water to spill out. What is the estimated gravitational force of the object?

Science and maybe re
This isn't really homework, but I thought someone could really help me with this. Did time exist before the Big Bang? I believe in God; if time always existed, why did he make it wait? Looking for a really scientific explanation. Thanks!

Science
A balloon filled with air is taken up a mountain with hiker. What is the pressure exerted on the balloon at sea level?

Science
What is the most popular non-renewable energy source?

Science
Determine the final temperature when 100 g of water absorbs 1000 J of thermal energy, given that the initial temperature of the water is 20.0°C. The theoretical specific heat capacity of water is 4.19 J/g·°C. Show your work below.

7th Grade Science
1. Which of the following statements about continental glacial movement is correct? A. Continental glaciers can only flow uphill. B. Continental glaciers can flow in all directions *** C. Continental glaciers can only flow downhill. D. Continental glaciers do not flow at all. ...

Science
How does friction affect the height that a ball will bounce? Can you give a hypothesis too of what i'll need to do please!? I'm confused

Science
How does friction affect the height that a ball will bounce? Can you give a hypothesis too of what i'll need to do please!? I'm confused

Science- 8th grade- please help!!
1) What evidence is there that the human species has been successful so far? Explain. 2) What environmental pressures in the past do you think were most important in shaping the human species as it exists today? 3) What environmental pressures exist now that you think may be ...

science
when you turn a television on, you transfer electrical energy into __. choose all that apply. a heat energy b light energy c elastic potential energy d sound energy

science
An electric stove transfers heat too a pot by a.) conduction b.) convection c.) radiation d.) friction

Science
Can you give me help understanding this question? A skydiver prepares to jump out of a plane. Explain how gravity and air resistance will affect the motion of the skydiver before and after he or she opens the parachute.

GEN 499
Question 25. 25. <21{8[1(07)95]}> Political science professor: Many people insist that the Internet is revolutionizing the political process. They argue that Internet debates and online political polls and chat rooms give people greater access to political information. ...

Science
what happens immediately before a volcano erupts ? a) magma collects in the mantle** b) lava hardens to form volcanic rock c) expanding gases pushes magma through the pipe d) the temperature in the magma chamber decreases

Science
Okay, so I have been working on this question for about two weeks...craxzy right?! BUt help 1. How does salinity affect the temperature and density of water?

physical science
The force of gravity acting on a body is 675 newtons. find the mass of the body to the nearest kilograms.

physical science
Why is the atmosphere pressure lower on a high mountain peak than at sea level?

science
A patient takes the recommended dosage of painkiller pills, but does not feel any immediate effect. What should the patient do next?

science
the cake is sititing on table with a gravitation force of 57.6 and a normal force of 57.6 what is the sum of all forces

physical science
What is the momentum, in kg-m/s of a 54,000 kg ship going 12 mph?

physical science
How many kilojoules are required to melt 5 lbs of gold if its initial temperature is 1000 K?

Science
How can using biomass fuels instead of gasoline in car engines help conserve natural resources? a. I makes cars run faster. b. It burns more fossil fuels. c. It reduces the use of coal.<---- d. It uses a renewable resource.

science
During a reaction of ca(oh)2 with carbon dioxide gas, 20g of solid caco3 is formed. calculate the mass of the nahco3 needed to produce the amount of carbon dioxide gas responsible for forming the caco3 precipitation.

Science
Name the Pb (NO³)²

science
What is mixture?

Science
1. What type of map would you use to locate the mountain ranges on a continent? idk!

Science (Chemistry)
So all I have to do now is cross multiply and solve for x right? Also when that happens, how do I factor the x^3? What do I do?

Science (Chemistry)
Hello DrBob222 Regarding the answer you gave me thank you very much. However when you expand the denominator, I don't get -0.14 but I get -0.28. I get that because when I first expand I get 0.0049 - 0.14x - 0.14x + 4x^2. So when I simplify that I get -0.28x. So could you ...

Science
1.A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? (1 point) A.frequency and wavelength B.wavelength and wave speed C.amplitude and wavelength D.amplitude and frequency 2. ...

science
How would the ecosystem’s carrying capacity for a species change, if the species cannot adapt to changes of habitat?

science
What can happen to an animal species if it cannot adapt to changes taking place in its habitat?

science
Which of the following is the best course of action when it comes to using natural resources? A. Only nonrenewable resources should be carefully managed B. Only renewable resources should be carefully managed C. Conservation should be implemented for both renewable and ...

science
How many joules of heat is required to change 40.0g of ice at 0degrees Celsius to liquid water at 0 degrees Celsius.

science (any tutor)
Which kind of pollution is illustrated by a pipe gushing polluted water into a river? A. Point source*** B. Nonpoint source C. Carbon source D. Resource source

Science (Chemistry)
A chemical system within a sealed 1 L reaction vessel is described by the following reversible reaction equation: 2H2S(g) <---> 2H(g) + S2(g) If the equilibrium constant is 0.000 004 200 at 1103 K find: (a) the reaction quotient intially (b) the order of concentration of...

science
when 8.4 g of NaHCO3 is added to a solution of CH3COOH weighing 20 g .It is observrd that 4.4 g of CO2 is releasd into atmosphere and a residue is left behind .calculate the mass of residue by applying law of conservation of mass .

science
the resultant of two forces 13n and 20 n is f if the first forces is doubled the resultant is also doubled to 2f find the angle betwen the two forces

science
how physical/mechanical and chemical weathering different?

science
how are physical/mechanical and chemical weathering alike?

Science (Chemistry)
A chemical system within a sealed 1 L reaction vessel is described by the following reversible reaction equation: 2H2S(g) <---> 2H(g) + S2(g) If the equilibrium constant is 0.000 004 200 at 1103 K find: (a) the reaction quotient intially (b) the order of concentration of...

Science
Sorry Ms Sue I forgot to separate them A species of flowering plant produces vibrant blue flowers. The flowers attract both pollinators that spread the plant's pollen and herbivores that feed on the plant. An adaptation occurred through several generations of plant species, ...

Science
Can you please help me answer just a couple questions A species of flowering plant produces vibrant blue flowers. The flowers attract both pollinators that spread the plant's pollen and herbivores that feed on the plant. An adaptation occurred through several generations of ...

Science
How could sustainable use preserve biodiversity in hot spots?

Science
During a space shuttle landing, a parachute deploys from the back of the shuttle as it taxis down the runway. In addition to the speed brake, the parachute helps the shuttle come to a complete stop. How does the parachute help during this process? A. It increases the weight of...

science
A bicycle tire is filled with air to a pressure of 6.80 atm and a temperature of 19 degrees Celsius. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58 degrees Celsius. The volume of the tire increases by 4.0%.What is the new pressure in the ...

science (any tutor)
Similarities in the early development of chickens and opossums suggest that these organisms share a________. common ancestor???

science (any tutor)
a farmer sprays insecticide on his crops and notices that the insect pest problems disappear. a year later he tries the same insecticide only to find that he did not achieve the same result. the insect population shows resistance to the insecticide.This is na example of _____ ...

science school
A body of mass 20g appears to have a mass of 13g in oil and 12g in water what is the relative density of oil.

science (any tutor)
Narwhals are aquatic mammals known for the giant tusk that protrudes from their upper lip. These mammals live in artic waters and can spend more than three hours at a time underwater at great depths that would crush other animals. The narwhal's ability to endure such long ...

science (any tutor)
Similarities in the early development of chickens and opossums suggest that these organisms share a________. common ancestor???

science (any tutor)
Very few fossils of jellyfish or their close relatives have been found. This makes it hard to trace the evolutionary history of jellyfish using the fossil record. What explains this? A. Jellyfish fossils are buried deep under the ocean floor, not in land areas where scientists...

science (any tutor)
Luther Burbank was a plant breeder who developed a strain of potato plant that produced more tubers (the part of the root that people eat) of larger size than other potato plants that were grown on farms at the time. This strain of potato was also resistant to the potato ...

science (any tutor)
2. How did Darwin and Lamarck differ in their thinking about change in species? A.Darwin thought that organisms could induce their own changes, while Lamarck thought that change could only be induced by an organism’s environment. B.Darwin thought that change could occur in ...

science (any tutor)
3. Luther Burbank was a plant breeder who developed a strain of potato plant that produced more tubers of larger size than other potato plants that were grown on farms at the time. This strain of potato was also resistant to the potato blight that had wiped out the potato ...

Ms. Sue PLZ HELP!!!(science)
When evolution was first proposed, which of the following was used as evidence to support the idea? A. observations of nature *** B. laboratory experiments C. extensive fossil collections D. genetic sequences

science
a body of mass 5kg is thrown to a height of 100m.what is its potential energy at the maximum height.?

science
calculate the volume of gas at STP that is produced when 1g of silver nitrate is heated. the unbalanced reaction is: AgNO3(s)=Ag(s)+NO2(g)+O2(g)

Science 8
I need help on this portfolio project, I have to do a lab report on light refraction. The research question is "How does change in medium affect light?" and I need to make a hypothesis, but I don't know what to put.

WEATHER SCIENCE SOS! I NEED ANSWERS CHECKED! SOS
How does latitude affect climate? a.) Areas near the equator have cooler climates than areas far from the equator. b.) Areas near the equator have warmer climates than areas far from the equator.*** c.) areas near the equator have 4 seasons.*** d.) areas near the equator do ...

Science
What is the similarities between conduction and radiation What is the similarities between convection and radiation

science
if the actual mass of oxide at the end of the experiment is 130g, what is percentage yield?

science
name four principles of kinetic friction

science
How many kcal of heat energy are removed from the body with every 1 L of sweat?

Science help
Provide two statements that demonstrate the importance of units when describing motion. I don't know how to answer this question :(

science (percentage yield)
if 100g of iron reacts with excess oxygen, how much rust should be produced?

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