Science

Recent Questions

Science
1. Which of the following is true about the electric charges on the objects below? a. The ball on the right has a positive charge and the ball on the left has a negative charge. b. The ball on the left has a positive charge and the ball on the right has a negative charge. c. ...

science
A student is all 32 gram of potassium nitrate in water to prepare 200 ml of solution what is the concentration of solution in terms of mass by volume

forensic science
"In fluorescence microscopy, the wavelength of the emitted light is __________that of the exciting radiation." Longer than Shorter than Equal to Either longer or shorter than Impossible to determine My answer is Longer than am I correct

Science , Biology
Are both of osmosis and diffusion movement of high concentration to low concentration? just a deferences of water or molecures?

Science (soon if so)
Over the years technology has gotten a) smaller**** b) heavier c) less complicated d) more expensive What is nanotechnology? a) Nanotechnology is engineering new elements by changing their atoms***** b)Nanotechnology is a way to lengthen radio waves and improve cell phone ...

Science
6TH GRADE SCIENCE HELP ME FINISH MY LAST QUESTION OF SCHOLL!!!!!!!! YAYYYYYYYYYYYYYYY 21PT Please Help Explain the differences between internal and external fertilization and the advantages and disadvantages of each reproductive strategy. explain in detail plz help will mark ...

Physical science CHECK my answers
6. Sound is an example of a(n) _____________ wave * Longitudinal******* Transverse Surface Electromagnetic 7. Which of the below options demonstrate reflection? * A rainbow Ripples in a pond******* An echo The tone that a plucked rubber band makes 8. Sound waves carry music ...

Science
The mass of sodium carbonate required to prepare 250ml of 0.4N solution is

Science
If 1 mole of acetic acid and 1 mole of ethyl alcohol are mixed and reaction proceeds to equilibrium, the concentration of acetic acid and water are found 1/3 and 2/3 mole respectively. If 1 mole of ethyl acetate and 3 mole of water are mixed,how much ester is present when ...

Science(maths)
How many H atoms are contained in 1.50g of glucose

science
A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is thrown vertically upwards with a velocity of 25 m/s. When and where will the two stones cross each other?

Science
Earth is sphere yes or No

Science.
A Car is travelling at 20 km/s along a road . A child runs out into the road some ahead and the car driver steps on the brake pedal.What must the car's Acceleration be if the car is to stop just before it reaches the child?

Physical science CHECK my answers
1. Which of the following correctly lists friction types (excluding fluid friction) from strongest to weakest? (2 points) * a. static, sliding, rolling b. sliding, static, magnetic c. weak, strong, nuclear d. rolling, sliding, static*** 2. Two or more velocities add by ...

Science
Imagine you are a laboratory technician studying how a medicine reacts with cancer cells. Describe how learning and developing new skills to analyze a specimen can help make the world a better place. I really need to know this by 9:30 tonight and I'm really lost!!! Please help!!!

Science
Describe the process of decomposition

science
can a metal sphere of radius 1cm hold a charge of 1 coulomb?justify your answer.

science
if the speed of shatabdi express is 150 miles per hour,then express its speed in SIunit

Science
What is the formula of calculating linear expansion

Washington state history
please help What about Washington’s post-World War II economy does the image represent? A.a change in focus to large businesses, science, and technology B.a change in focus to large businesses, science, and technology C.a decline in building and city growth D.a shift from ...

science
when the air under the envelope is heated the balloon lifts which of the following statements is true

Science, Chemistry
Using chemical equations, write the chemical reactions for the following; photosynthesis, combustion, corrosion of iron.

Science
Consider a lead-acid battery with 500 Ah capacity and a rated voltage of 12 V. a)What is the total capacity of energy in watt-hours that can be stored in the battery? b)Assume that the battery is completely empty. The battery is now charging at a C-rate of 0.20C. What is the ...

Science
Hello, can anyone help me answer this question: What is the result of a silent mutation at a) DNA level b) amino acid level c) protein level d) phenotype level Thank you.

Science
Reaction between potassium dichromate and sulphur dioxide gas??

Science
Reaction between potassium dichromate and sulphir dioxide gas?

Science
Give two reasons why it is difficult for scientists to predict exactly how the climate will change in the future?

Science
Can you send me to a link that explains how genetic variation and environmental pressures can lead to a change in the characteristics of a population.

Biology
I need help finding a scientific journal on either one of these topics and talk about science environment technology and society, how this research contributed. -Genetics -Plants -Evolution -Diversity

science
Copper crystallizes in a face centered cubic lattice . Calculate the nmber of unit cell in 1.2 g of copper atomic mass of copper is 63.5 u

science
condition required when Silver Nitrate reacts with dilute hydrochloric acid

Maths science English hindi s.st computer
Find the effective resistances in paralle if all four resistances are equal to 1 ohm

Science
The Millennium Force is the highest roller coaster in North America. It reached a maximum height to 94.5 m. The total mass of the roller coaster car and its passengers is 1380 kg. The speed of the roller coaster is 41.1 m/s at its lowest point on the tracks. What is the ...

Science
Why do earthquakes appear near the San Andreas Fault?

Science
How many atoms are there in one molecule of the following compounds? a. silver chloride- AgCl b. calcium oxide- CaO c. Magnesium nitride- Mg3N2 d. Aluminium oxide- Al2O3 e. Scandium sulfide- Sc2S3 f. Hydrogen Peroxide- H2O2

Science
Why is it important for scientists, who communicate with each other all over the world, to have a uniform set of chemical symbol?

science
A car attains 54km/hr in 20 seconds after it start from rest. Find the acceleration of car.

science
A boy travels a distance of 10m towards south and then he runs towards east and travel 12m in that direction. Calculate yhe total distance travelled by the boy and displacement from his initial position.

Science
A homeowner determined that he used 114 gallons of oil to heat his home during game the winter. This information would be considered part of his ________?

Science
The coinage metals - copper, silver, and gold - are considered to be a chemical family. List three arguments to explain why. Please help!!

science
a scorpion stalks, kills and then eats a spider, based on its behavior what ecological term describes the scorpion? a) producer, herbivore, decomposer b)Producer, carnivore, heterotroph c)Predator, carnivore, consumer d) Predator, autotroph, herbivore

Science
The closer together magnetic field lines are, the The magnetic force A closer B farther C stronger D weaker

forensic science
Identification is the examination of chemical and physical properties of an object and using the results to categorize the object as a member of a group. Which of the following are examples of identification? Determination that hairs found on a bag are from a cat Determination...

science
A cube has each edge equal to 2cm.Mass of cube is 20.8 g.what is its volume and density

Science
Two forces acting in the opposite direction have a resultant of 10N. If they act at the right angles to each other the resultant is 50N .the magnitude of the forces are

Science
If A vector = B vector + C vector and the magnitude of A,B and C are 5,4 and 3 units respectively the angle between A and C is

Science
If three vector A.B and c are 12,5,13 in magnitude such that c vector = A vector + B vector ,then the angle between A and C is

Science
Two forces have magnitude in the ratio 3:5 and the angle between their directions is 60°. If their resultant is 35N their magnitude are

science
Which sequence shows the correct order of Earth’s geologic time intervals from oldest to youngest?

Science
If I made an electromagnet what would the variables be. controlled, dependent and independent

Science
Table salt has a solubility of 36g of salt in 100g of water at 40 degrees celcius. If 15g of salt is added to 50g of water at the same room temperature, is the resulting solution saturated of unsaterated? Explain your answer.

forensic science
What is a trier of facts? Only a trial by a jury the party or parties determining guilt or innocence only a trial by a US Superior Court magistrate the determination of guilt or innocence by an elected official the complete summary of all evidence in a case

physical science
Do the following substance desosolve in water? Give a reason for answer A) Ethanol B) Iodine

physical science
Why does liquid substance have the same meniscus shape

Science
How much retardation must be applied to stop a bus running at a uniform speed of 40km/h in 5 seconds?

science
Describe how you would separate a mixture of sand, iron fillings and granulated sugar

Physical science
Which of the following homogeneous and which are heterogeneous? Blood, carbon dioxide,Rock, steak,iron, concrete, air,oxygen, salt, milk.

science
name the metals and non metals present our body

Science
A solution contain 40 centimetre cube of alcohol mixed with 150 cm cube of water calculate the concentration of the solution

Science
To make a saturated solution 37 gram of aluminium chloride is dissolved in 10.0 gram of water at 293 K find it concentration and this temperature?

Science
I need help once more. I have this last homework assignment then I'm done with school! I was way behind but I caught up, so I'd love it if any of you could check my answers. Please and thank you! ^-^ 1. Which of the following describes an example of land reclamation? a. After ...

science
A scientist is examining a multicellular organism that has a cell wall. What kingdom does this belong to? a. Fungi b. Animalia c. Plantae d. Eubacteria i believe that its a

science
The process that creates cells with different genetic combinations is a. asexual reproduction b. mitosis c. cell fission d. meiosis i believe its d?

science 7b tecca
which of the following ussually causes creep? volcanic activity low water content plate tectonics*** freezing and thawing of water beneath the soil.

science
A bottle full of water has mass of 100g. when the same bottle is filled with luquid X, its mass is found to be 80g.If the mass of an empty bottle is 50g, calculate the density of the liquid?

science
What is the main function of glycoxisomes (is organell) ???

science
When limiting factors ________, diversity in populations _________. a. decrease; decreases b. increase; increases c. increase; decreases d. increase; stay the same i think it is a

Physical science CHECK my answers
1. What is the smallest part of all matter called? (1 point) * a. Element b. Atom*** c. Molecule d. Compound 2. Which of the subatomic particles is negative? (1 point) a. Nucleus b. Neutron c. Proton d. Electron***** 3. Who provided the first evidence that atoms contain ...

science
following balanced chemical reaction: Ca2+ (aq)+ CO3 2-- (aq) ⇄CaCO3(S) The amount of dissolved CaCO3 can be increased on adding: CaCO3(S) KNO3(S) Na2CO3(S) CH3COOH(S)

Science
I have to make an experiment that supports the hypothesis that light travels in straight lines except at the point it enters a new medium and i was wondering if somebody could help me out by sending some links for ideas because ive been stuck for a while thanks! heres the ...

Basic Geology
I need help with a Science essay. The question reads: "Hannah is comparing a rock from a riverbed and a rock from deep underground. One is very smooth, and the other has very rough edges. Explain why each rock was probably found in that location." In order for me to receive ...

math
As part of a school science project, Jacob bought some bulbs for a total of $18. The cost of each bulb was $3. How many bulbs did Jacob buy? Write an equation with a variable and state what the variable represents.

science
State a suitable hypothesis for this investigation

Science
Write balanced chemical reaction of the following- Stem is passed over heated iron to form magnetic oxide of iron and hydrogen.

Math & science
If a car slows down from 15m/s to rest in 5 seconds calculate retardation

Science (Geology)
I am doing an assignment on the rock quartzite, and I cannot find any information as to what rock comes after quartzite in the rock cycle (What rocks are formed from quartzite)? Help would be much appreciated.

science
The temperature is 66 degrees Fahrenheit. You drop a stone in a well. It hits water. You time this event: 4.6 sec. How deep is the well?

social science
State a possible hypothesis for this investigation.

Science/chemistry
CH4 + 2O2 --> OC2 + 2H2O What mass of water is formed by burning 4g of methane in excess oxygen? (Ar of carbon=12, Ar of oxygen=16 and Ar of hydrogen=1)

science
what measures the quantity of matter

Science
How dos the pull of a magnet work PLEASE ANSWER I NEED TO TURN THIS IN BEFORE JUNE 9th thank you!!

Science
Earth’s energy sources include both renewable and nonrenewable resources. Name at least three sources of energy that could be used in your house. Then describe the ideal energy source for generating most of your home’s electricity, and explain why you chose that source. I ...

science
i want a few examples of true solutions.

Science
A body that uniformly retarded comes to rest in 5.0s after travelling a distance of 10.0m. Calculate the retardation and initial velocity

Science
The green revolution depended on A) new biodegradable pesticides. B) high-yielding grain varieties. C) clearing forest for crop land. D) organic fertilizers.***

Math
There are 36 books on a bookcase.there are 9 nonfiction,12 fiction,and 15 science fiction. What is the probability of choosing a nonfiction book of choosing a fiction book of choosing a science fiction book?

science
2C3H6+2H2+N2+5O2→2CH3COONH3+2CO2+2H2O WHY?

math science geography
A resultant force of 15.00n acts on a body for 4s mass 4kg. calculate the change in momentum of the body within this period

chemistry (science)
explain the observed temperature change upon mixing ethanol and cyclohexane.

science
the_____ biome is characterized by its lack of trees warm tempeture and moderate rainfall nitrogen fixing am i right

science
the energy role of the first organism in a food chain is always

science
what does native americas not use tortora reed for

Science
How do global positioning systems use elevation points on Earths system to find latitude and longitude A. By using signals from a network of satellite B. By using topographic maps C. By using satellite images D. By using photography

Science
Do global positioning systems use elevation on Earths system to find latitude and longitude A. By using signals from a network of satellite B. By using topographic maps C. By using satellite images D. By using photography

Science
1. How Ian an areas topography determined? A. By using an areas longitude and latitude B. By using an areas scale C. By using an areas elevation, relief, and landforms * D. By using an areas elevation, longitude and latitude I really need to check my answers if anyone can help...

Science
Explain the law of motion needed to solve this problem and then solve it. On Planet Zorg, a 30 kg barbell can be lifted by only exerting a force of 180 N. What is the acceleration of gravity on Planet Zorg? Predict how the motion of this object would change if on Earth.

Science physics
mandy drops a 2.0kg book from a height of 4.5m. how much work has gravity done on the book? M=2.0kg D= 4.5m Not actually sure what to do next. Because none of the formulas work. I need work but I don't even know the force. To find force I need mass which I have but I don't ...

Science
I need help on this letter. You do not have to give me full answers but if you do give me a full answer, I will use it but edit it into my own words. Now it is time to apply and share what you have learned so far about energy sources. After completing the U.S. Overview ...

Science
When iron is heated with sulphur, iron sulphide is formed . Name the reaction

Science
A bicycle and its rider have a combined mass of 90kg. The cyclist is accelerating at 0.5m/s^2. What minimum force is he exerting? F=m•a F=90kg•0.5m/s^2 F= 45N However the answer on my answer key says 5×10^1

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