Tuesday
August 30, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

Science
A gas has an initial volume of 2.5 L at a temperature of 275 K and a pressure of 2.1 atm. The pressure of the gas increases to 2.7 atm, and the temperature of the gas increases to 298 K. The final volume of the gas, rounded to the nearest tenth, is
Tuesday, August 30, 2016 by Egle

Science, chemistry
During the experiment, 100ml will be required to prepare 0.5M solution of NaNO3. Calculate the mass of NaNO3 in grams that will be required.
Tuesday, August 30, 2016 by Hilen

Science
A student measures the mass of a paper clip. The student’s data table is shown below. The accepted value for the paper clip’s mass is 1.14 g. Trial 1, 2.45 g Trial 2, 2.40 g Trial 3, 2.42 g Which of the following describes the student’s measurements? a. The ...
Monday, August 29, 2016 by WonderWomen

science
When enough experimental data support a hypothesis, the hypothesis then becomes a fact theory inference conclusion I am torn between theory and conclusion
Monday, August 29, 2016 by kelley

science
. How does changing volume change the density of an object?
Monday, August 29, 2016 by Aubrey T.

life science
state the aim of this investigation
Monday, August 29, 2016 by zandi

science
a body of mass 2kg is suspended by a rope and is pulled to aside by a means of horizontal force ,so that the rope makes an angle 45 degrees with the vertical the horizo ntal force is
Monday, August 29, 2016 by guru sainath

Science
Do the shoes help the basketball players , run across the court ?
Monday, August 29, 2016 by Jasmine

science
do fruits and vegetables contain bases
Monday, August 29, 2016 by Anonymous

Science
A stone is dropped from 78.5 m ,after 1 sec,another stone is dropped,both reach the ground at the same time, calculate the speed of second ball.
Monday, August 29, 2016 by Sowmya

science
Ryan wants to identify an element. Which piece of information would best help Ryan identify the element?
Sunday, August 28, 2016 by Claire

Science
Imagine you designed an experiment that investigated the effect of feeding yeast cells different concentrations (0, 5, 10, 15, 25%) of sugar solutions. The yeast used the sugar to do cellular respiration and make CO2 as a waste product. The volume of CO2 released was captured ...
Sunday, August 28, 2016 by CC

Math science
If the numbers never end is zero the end number?
Sunday, August 28, 2016 by Jan

Science
Find linear momentum when a stone of mass 50kg is thrown from a height 10m
Sunday, August 28, 2016 by Shambhavi

Science
Force 4n,3n and 12n act at a in point mutually perpendicular directions .The magnitude of resultant force is
Saturday, August 27, 2016 by Rakesh

science
1. Which of the following is a good study habit? (1 point) a.maintaining a positive attitude b.waiting until the last minute to start on an assignment c.listening to the television while studying d.studying when you are tired
Friday, August 26, 2016 by help me fam

science
Molecular formula of silica is?
Friday, August 26, 2016 by bili

Science
Giant kelp has gas-filled sacs to help it float so it can do what
Friday, August 26, 2016 by Cameron

science
Molecular formula of silica is?
Friday, August 26, 2016 by bili

Science
The efficiency of a machine is 80%.calculate,the amount of energy needed by the machine to do work of 150joules.
Thursday, August 25, 2016 by Emmanuel

science
What information does an equilibrium constant give about a reaction? A. It tells how long it takes the reaction to reach equilibrium. B. It tells how much energy is required for the reaction to happen. C. It tells what the rate constant of the reaction is at equilibrium. D. It...
Thursday, August 25, 2016 by evelyn

science
Which rate constant would result in the fastest reaction? A. 1.3 × 103 L/mol · s B. 2.8 L/mol · s C. 9.5 × 10-2 L/mol · s D. 4.2 × 10-3 L/mol · s is the answer for this one c?
Thursday, August 25, 2016 by evelyn

science
A graph of experimental data is a straight line when ln[H2] is plotted versus time. Which rate law fits the data? A. Rate = k(ln[H'small2']) B. Rate = k/[H'small2'] C. Rate = k[H'small'2] D. Rate = k[H'small'2]^2
Thursday, August 25, 2016 by evelyn

science
If a reaction rate increases with temperature, how will the rate constant of the reaction change with temperature? A. The rate constant only changes upon addition of a catalyst to the reaction. B. The rate constant will decrease with temperature. C. The rate constant will not ...
Thursday, August 25, 2016 by evelyn

Science
Suppose u walk across the room of length 9 m with the velocity of 1.5m perhr. Calculate the velocity in m/s and the time taken to move across the room
Thursday, August 25, 2016 by Vidhi

Science
How many millilitres of water must be added to 30 mL of 10 M of HNO3, so that the solution concentration is reduced to 0.2 M?
Wednesday, August 24, 2016 by Tumpale

Science
A racecar driver steps on the gas, and his car travels 16 meters in 2 seconds, starting from rest. What is the average velocity in m/s and km/h?
Wednesday, August 24, 2016 by Anonymous

SCIENCE
When a student added Zinc granules to dilute HCI, a colorless and odorless gas was evolved, which was tested with a burning match stick, it was observed that: (a) The match stick continued to burn brilliantly. (b) The match stick burnt slowly with a blue flame. (c) The match ...
Wednesday, August 24, 2016 by A GOODSTUDENT

science
a bkock placed on a rough inclined plane of length 4m just begins to slide down when the upper end of the plane is 1m high from the ground.calculate the coefficient of static friction.
Wednesday, August 24, 2016 by Agam

science
what type of magma flows very fast
Wednesday, August 24, 2016 by emem

Science
A race car driver steps on the gas, and his car travels 16 meters in 2 seconds, starting from rest. What is the average velocity in m/s and in km/h?
Wednesday, August 24, 2016 by Kader

science
While exploring a cave, a spelunker starts at the entrance and moves the following distances. She goes 75.0 m north, 250 m east, 109 m at an angle θ = 30.0° north of east, and 156 m south. Find the resultant displacement from the cave entrance. The figure below ...
Tuesday, August 23, 2016 by john

Science
Bart believes that mice exposed to microwaves will become extra strong (maybe he's reading too much Radioactive Man). He decides to perform this experiment by placing 10 mice in a microwave for 10 seconds. He composed these 10 mice to another 10 mice that had not been ...
Tuesday, August 23, 2016 by Mika

science
1. Liquid phosphorus trichloride, PCl3 is made by the direct combination of phosphorus and chlorine. a. What is the maximum mass of PCl3 that can be produced from 125 g of P4 and 323 g Cl2? b. What mass of P4 remains after the reaction?
Tuesday, August 23, 2016 by wesley

Physical science check my answers
5. Steve's older brother got this cool new car. He said it can go from a stopped position to 80 miles per hour in ten seconds. His brother is describing the car's A. acceleration. *** B. average velocity. C. instantaneous speed. D. average speed. 6. Radar devices are ...
Tuesday, August 23, 2016 by Summer Moriarty

Physical science check my answers
2. On my bike, I was able to travel 40 miles in one hour. From this information, we can determine the bike's A. speed. *** B. velocity. C. acceleration. D. direction. 3. The local news team is tracking the storm and has reported that it is traveling north, northwest at 20 ...
Tuesday, August 23, 2016 by Summer Moriarty

science
Maths lit,life sciences,agricultural sciences,geography,life oriantions,english and setswana which career i fit in with this subjects?
Tuesday, August 23, 2016 by rapelang

science
Does hydrogen undergoes reduction or oxidation on the basis of oxidation number in 2NH3 +H2SO4 which gives (NH4)SO4
Tuesday, August 23, 2016 by reet

science
The half-life of carbon-14 is 5730 years. If we start with 10 grams of carbon-14, after 5730 years, we will have _____ of carbon-14 left.
Tuesday, August 23, 2016 by leon

science
What is the oxidation number of Si in (CH3)2SiCl2
Tuesday, August 23, 2016 by reet

science
2. How many grams of 96.5% pure NaOH pellets do you need to make 1.000 liter of 1.50 N NaOH?
Monday, August 22, 2016 by h

science
how to balance chemical equations with redox reaction Cr(OH)3 + IO3{-} + OH{-} = CrO4{-2} + I{-}
Monday, August 22, 2016 by debayan

science
what is the action of chlorine gas on ethane
Monday, August 22, 2016 by vishwajit

Science - Please Look!
The senses are used to make which of the following? inferences predictions evaluations ((**observations**)) You walk into the kitchen and see a broken egg on the floor. Which of the following is an inference you can make based on this observation? ((**The egg rolled off the ...
Monday, August 22, 2016 by Kat

Science
A transvers wave traveling on a rope is given by y=0.25 sin(0.3 radX-40radt), where y and X is expressed in meter and t is in seconds. Determine a-Amplitude. B-frequency C-Direction of motion. e-Displacement at X=0.6 m and t=2.3 s. Please help me
Monday, August 22, 2016 by Shehab

SCIENCE
A farmer believes that fertilizer runoff from a farm is killing the fish in a nearby pond. The farmer measures the amount of fertilizer in the pond each week and counts the number of dead fish. The measurements indicate that, as the fertilizer concentration increases, the ...
Monday, August 22, 2016 by HAYDEN

SCIENCE
1. WHICH OF THE FOLLOWING IS MOST LIKELY TO RESULT IN A SCIENTIST DRAWING WRONG CONCLUSIONS? A. CONDUCTING A DOUBLE-BLIND TEST B. CONDUCTING A CONTROLLED EXPERIMENT C. PREVENTING OPINIONS FROM AFFECTING DATA COLLECTION D. GATHERING DATA FOR A BRIEF PERIOD OF TIME D
Monday, August 22, 2016 by HAYDEN

Science
What is the function of the nucleus in a cell? A.The nucleus controls the cell’s activity.** B.The nucleus identifies a cell as belonging to a plant. C.The nucleus determines what substances enter and leave the cell. D.The nucleus can be seen under a transmission electron...
Monday, August 22, 2016 by Anonymous

Science
What safety rules should I follow before, during, and after a laboratory investigation?
Monday, August 22, 2016 by My name is no

Science
Which of the following is not part of the cell theory? A.Cells are the building blocks of life. B.All living things are made up of cells. C.All cells are created from other cells through cell division. D.The nucleus is the control center of the cell.***
Monday, August 22, 2016 by Anonymous

science
an electron orbiting around hydrogen atom in circular orbit of radius 1armgstrom with the speed of 5*10^6 m/sec. Calculate magnetic field produced at the nucleus?
Monday, August 22, 2016 by Anonymous

Science
Can air be pumped into the container completely filled filled with water?
Monday, August 22, 2016 by Nurin

science
Which rate constant would result in the fastest reaction? Which rate constant would result in the fastest reaction? 1 1.3 × 103 L/mol · s 2 2.8 L/mol · s 3 9.5 × 10-2 L/mol · s 4 4.2 × 10-3 L/mol · s
Monday, August 22, 2016 by leon

science
A graph of experimental data is a straight line when ln[H2] is plotted versus time. Which rate law fits the data? 1 Rate = k(ln[H2]) 2 Rate = k/[H2] 3 Rate = k[H2] 4 Rate = k[H2]2
Monday, August 22, 2016 by leon

science
The half-life of carbon-14 is 5730 years. If we start with 10 grams of carbon-14, after 5730 years, we will have _____ of carbon-14 left.
Monday, August 22, 2016 by leon

Science
Wht is acid,base,and salts.
Sunday, August 21, 2016 by Guneek Jain

Physical science
Two charged spheres P and Q have charges of+3C and -6C respectively.how far apart must the spheres be placed so that they exert an electrostatic force of 5 N on each other
Sunday, August 21, 2016 by Nombuso

Science Chemistry
Calculate the no. of grams of NaOH req. to absorb volume of the CO2 gas produce as Na2CO3
Sunday, August 21, 2016 by Sumee

maths,life science,geography,business
it is possible to these subject
Sunday, August 21, 2016 by khomotjo

Science
A simple pendulum oscillates with an amplitude of 30 degrees. If the length of the string is 1.0m. Calculate the velocity of the pendulum bob at its lowest point.
Saturday, August 20, 2016 by Maddi

science
Kinetic energy is the type of energy that is associated with: A. kinds of gases. B. electricity. C. motion. D. position.
Saturday, August 20, 2016 by finley

science
What is the strongest intermolecular force that occurs between methane (CH4) and ammonia (NH3)? A. Dipole-dipole forces B. Hydrogen bond C. London dispersion forces D. Dipole-induced dipole attractions
Saturday, August 20, 2016 by finley

science
A Geiger counter is used to measure the activity of a sample of iodine-131. Based on the data, what is the half-life of iodine-131? A. 16 days B. 8 days C. 4 days D. 12 days
Saturday, August 20, 2016 by finley

science - chemistry
How can we separate a mixture of iodine, napthalene, chalk dust and saw dust. Write the ans in the form of a flow chart.
Saturday, August 20, 2016 by shaan

science
Which of the following terms are present in the rate law? A. The rate constant, the concentration of the reactants, and the order of the reactants B. The rate constant and the concentration of the reactants C. The rate constant and the temperature of the reactants D. The rate ...
Saturday, August 20, 2016 by jessie

SCIENCE
What are the differences between a hydrogen filled balloon and an air filled balloon flying or moving in air?
Saturday, August 20, 2016 by THE MASTER

Science
a stone drops from the edge of the roof. it crosses a window 2m long in 0.1sec. how much time does the stone take to reach the lower end of window from roof? answer the question
Saturday, August 20, 2016 by RHYTHUM

SCIENCE
Why does one feel difficult to breathe in a deep well while cleaning it?
Saturday, August 20, 2016 by someone

science
How many atoms of carbon are needed to produce 0.45 mol Al? 3C + 2Al2O3 4Al + 3CO2 A. 2.6 × 1026 atoms B. 9.7 × 1024 atoms C. 3.0 × 1022 atoms D. 2.0 × 1023 atoms
Friday, August 19, 2016 by megan

Science
A helium tank has a volume of 8.0 L. It contains enough helium to fill 23 circular balloons with a radius of 15 cm at a temperature of 25.0 C (room temperature). Assume that the pressure inside the balloons is 2.0 atm. What volume would all the gas in the tank occupy at 2.0 ...
Friday, August 19, 2016 by Lisa

science
49. A researcher writes a grant proposal to repeat an experiment that was recently published by another researcher. Which of the following statements best supports the grant proposal? A. Funding this grant proposal will allow this laboratory to continue to study this topic. B...
Friday, August 19, 2016 by keia

Science
Design of a fourth order low pass filter with 150 Hz frequency for ecg acquisition
Friday, August 19, 2016 by Madhu

Science
What do you mean by resultant vector?
Friday, August 19, 2016 by Rabin

science
Fifty grams of ice at 0 degrees celcius is added to 200grams of water at 40 degrees celcius contained in a 100 grams copper calorimeter. If the final temperature of the mixture is 16 degrees celcius, find the heat of fusion of ice.
Thursday, August 18, 2016 by arnold gamboa

Physical Science
How many significant figures should the product 62.25 * 37.4 have ? a-2 b-3 c-4 d-7 my answer is c or 4
Thursday, August 18, 2016 by Steve

Science
Is Gelatin a suspension?
Thursday, August 18, 2016 by Moesha

Science
You are exercising on a hot day. Your body temperature goes up. You begin to sweat. The sweat cools your body. Sweating is an example of: A. Input B. Process C. Output D. Feedback I'm not sure whether it is C or D...someone please help?
Thursday, August 18, 2016 by Scarlet

science
what is Newton first law
Thursday, August 18, 2016 by Given

science
The boy A weighs 50 kg and the girl B weighs 35 kg in a seesaw...the board of the seesaw is 3.6 meter... To balance the seesaw where should girl C who weighs 25 kg seat or what particular distance should girl C seat to balance it
Thursday, August 18, 2016 by james

science
Calculate the % yeild of the reaction if 64 g of NaBH4 with iodine produces 15_g of BI3
Thursday, August 18, 2016 by jyoti

science
Which of the following is an example of heterogeneous catalysis? A. Ethylene and hydrogen gases are adsorbed onto the surface of a metal catalyst to accelerate the formation of ethane. B. An enzyme catalyzes a biochemical reaction that produces the alcohol and CO2 gas in beer...
Thursday, August 18, 2016 by megan

science
How would the fraction of successful collisions change with an increase in reaction temperature? A. The fraction of successful collisions would decrease. B. The fraction of successful collisions would remain unchanged. C. The fraction of successful collisions would increase. D...
Thursday, August 18, 2016 by megan

science
What order is the radioactive decay of carbon-14, an unstable isotope of carbon? A. Third order B. Second order C. Zero order D. First order
Thursday, August 18, 2016 by megan

Science work
A reaction is thought to be second order with respect to the concentration of carbon monoxide. What evidence would support this? Answer options... A. Changing the initial concentration would have no effect on the rate. B. Any change in the initial concentration would cause a ...
Thursday, August 18, 2016 by Jackson

Science - Chemistry
If the rate law of a chemical reaction is k[NH4+]2[NO2–], what is the order of the reaction? 1. The order of the reaction cannot be determined. 2. 3 3. 1 4. 2
Thursday, August 18, 2016 by Jessie

Science help pleaseeeee?!?!
A gas has a volume of 4.25 m3 at a temperature of 95.0°C and a pressure of 1.05 atm. What temperature will the gas have at a pressure of 1.58 atm and a volume of 2.46 m3? A. 356°C B. 82.7°C C. 47.5°C D. 321°C
Thursday, August 18, 2016 by Science

Science
Which of the following is not a postulate of the kinetic molecular theory? A. The collisions between gas molecules are elastic. B. The energy of a gas molecule is determined by quantum mechanics. C. Gas molecules travel in random, straight paths. D. The absolute temperature of...
Thursday, August 18, 2016 by Science

Science
A farmer wants to determine if a new fertilizer gives her a better crop yield than her old fertilizer. She spreads the old fertilizer in field A, which has a brand new irrigation system. She spreads the new fertilizer in field B, which has an irrigation system that will be ...
Thursday, August 18, 2016 by Sam Winchester

Science
how does an individual’s genetic makeup interact with nutrition, smoking
Wednesday, August 17, 2016 by Ashley

Science
A student measures the volume of a liquid and finds it to be 40 mL. How many significant figures are in the measurement? A) 1*** B) 2 C) 3 D) 4 Is this correct? I'm not entirely sure if it's 1 or 2...
Wednesday, August 17, 2016 by Scarlet

Science
25n . 8 seconds how much power ?
Wednesday, August 17, 2016 by Heizer

Science
A scientist studying the effects of gamma rays on marigolds gathered the data shown below. Hypothesis: Marigolds exposed to higher levels of radiation will not grow as well as marigolds that are exposed to less radiation Plant A: Gamma Rays (Rad/day) is 5. Water (mL/week) 50. ...
Wednesday, August 17, 2016 by A.

science
how many grams of nacl are required to completely neutralize of 1 M of h2so4
Wednesday, August 17, 2016 by sunaina

physics question
For a science fair competition, a group of high school students built a kicker -machine that can launch a golf ball from the origin with a velocity of 11.2m/s and initial angle of 31.5° with respect to the horizontal. a) Where will the golf ball fall back to the ground? b...
Wednesday, August 17, 2016 by himel

science
how to find no of g atoms and weight of an element ?
Tuesday, August 16, 2016 by vaishnavi

English II
1. Explain the difference between a mystery and a legend. 2. Create a list of at least five (5) of these proven and unproven beliefs about your chosen event. 3. Explain why each of the items in the list are proven or unproven. 1. A mystery is something that remains unexplained...
Tuesday, August 16, 2016 by Sue

Science
Under the 1980 Low-Level Radioactive Waste Policy Act, each state must take responsibility for its non-defense related, low-level nuclear waste. If nuclear waste was NOT regulated and disposed of properly, which of these could be a possible effect? A) The risk of cancer in ...
Tuesday, August 16, 2016 by Jay

Science
A car is braked so that it slows down with a uniform retardation from 15m/s to 7m/s while it travels a distance of 88m. If a car continues to slow down at the same rate, after what further distance will it be brought to rest?
Tuesday, August 16, 2016 by Manish

Maths
In a class of 52 students 16 study science.1/3 of boys and 1/4 of girls. How many boys are in the class.
Monday, August 15, 2016 by Mohammed sadik kapito

Science
what is the difference between mass and weight? The mass of an object is the amount of matter it contains, while its weight is a measurement of the force that gravity exerts on it. The mass of an object is always less than the weight of an object. The mass of an object is ...
Monday, August 15, 2016 by Nick J.

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