Tuesday
September 27, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

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

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
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.

maths
In a class 20 pupils like science, 13 pupils like history,8 pupils like both subjects and 9 pupilz do no not like either subject..use a Venn diagram to find how many pupils were in the class.....?? Help me
Monday, August 15, 2016 by Tiyamike

Science(help please)
1.What is the difference between an observation and an inference? 2.what is a easy way to remember the difference between qualitative and quantitative data? 3.What is the difference a law and a theory? 4.Why is it important to remove bias from scientific research?
Monday, August 15, 2016 by Senpai onii-chan

science
Force F=5N acts to the right. Draw a fully labelled scale drawing of the 5 N force using a scale of 10:1N.
Monday, August 15, 2016 by tshepiso mdlalose

Science
which of the following describes scientific inquiry? (1 point) a statement that describes what scientists expect to happen in an experiment facts, figures, and other evidence gathered through observation the diverse ways in which scientists study the natural world a well-...
Monday, August 15, 2016 by LOVE

Science
1.What is the difference between an observation and an inference? 2.what is a easy way to remember the difference between qualitative and quantitative data? 3.What is the difference a law and a theory? 4.Why is it important to remove bias from scientific research?
Monday, August 15, 2016 by Senpai onii-chan

Science
An aeroplane flying in the air dips with a speed of 360 km per hr in a vertical circle of radius is 200m the weight of the pilot sitting in it 75kg calculate the force with which the pilot presses his seat and plane is at lowest point and plane is at highest point
Monday, August 15, 2016 by Anonymous

science,John Dalton
what did john dalton do at 12 that he carried out through his life? what was his ides on schemicals react? which theory did he come up with?
Monday, August 15, 2016 by teesh

Science
Bob created an experiment to test what plants need to survive. He believes plants only need water to live. In order to test his hypothesis, Bob planted two of the same types of plant. Only one received water and sunlight. While the other plant only received water. He measured ...
Sunday, August 14, 2016 by Hayden

science
ten tonics with local produce that can help to reduce stress
Sunday, August 14, 2016 by esha

Science
What science field is Vantablack considered to be part of?
Saturday, August 13, 2016 by Mary

science
list with match stick figures/pictures of some exercises to release stress.
Saturday, August 13, 2016 by esha

Science
How the adhesion and cohesion properties of water are linked to photosynthesis😐
Saturday, August 13, 2016 by 🤓👑

PHYSICS/SCIENCE
How much heat must be removed from 5.0g of water at 10°C to become ice at 0°C ? (my name is Kevin and I changed it to KPL cuz there is another kevin here)
Saturday, August 13, 2016 by KPL

science
What is absolute zero temperature?
Saturday, August 13, 2016 by Bhawana

PHYSICS/SCIENCE
How much heat must be removed from 5.0g of water at 10°C to become ice at 0°C ?
Saturday, August 13, 2016 by Kevin

Physics/Science
How much heat must be removed from 15.0g of water at 10°C to become ice at 0°C?
Saturday, August 13, 2016 by Kevin

science
10ml of 1M H_2 〖SO〗_4 will completely neutralize 10ml of xM NaOH solution. what is the value of x
Friday, August 12, 2016 by KANNAN

science
Calculate the pH of the solution 5ml of M/5,HCl+10ml of M/10 NaO
Friday, August 12, 2016 by KANNAN

science
if 〖HNO〗_3 changes into N_2 O,then calculate the change in oxidation number.
Friday, August 12, 2016 by KANNAN

science(chemistry)
A laboratory instructure gives a sample of Amino-powder to each if four students,1,2,3 and 4,and they weigh the samples.The true value is 8.72g.Their results for three trails are (1),8.72g,8.74g,8.70g (2),8.56g,8.77g,8.83g (3),8.50g,8.48g,8.51g (4),8.41g,8.72g,8.55g (A)...
Friday, August 12, 2016 by mary tembo

Science
Why might a scientist estimate a measurement?
Thursday, August 11, 2016 by Ariana

Science
Which of the following is not part of the cell theory? Cells are the building blocks of life. All living things are made up of cells. All cells are created from other cells through cell division. (MY ANSWER) The nucleus is the control center of the cell.
Thursday, August 11, 2016 by LOVE

science
To answer these questions you will need to refer to the volume of water dripping over time graph that you created in your science notebook from interactive art plotting a line graph activity. 1. According to the trend shown by the graph what volume of water would you expect ...
Thursday, August 11, 2016 by lilly

Science
After creating a prototype, which of the following would not be an appropriate next step in the design process of new technology? Research the need. Test product safety. Troubleshoot problems. Obtain a patent.(MY ANSWER)
Thursday, August 11, 2016 by LOVE

Science -Please answer
Brand X Brand Y No cleanser Area(mm2) Area (mm2) Area (mm2) 0,0,0 0,0.25,1.0, 0,0.50, ,0.20 2.75 1.25,3.0 Which of the following is a constant, or control variable, in this experiment? The brand of cleanser that didn't work. (MY ANSWER) The results observed over four days...
Thursday, August 11, 2016 by LOVE

Science
Date X cleanser Y cleanser none 5/18/11 0 0 0 5/19/11 0 0.25 0.50 5/20/11 0 1.0 1.25 5/21/11 0.20 2.75 3.0 --------------------------------- Which of the following is a constant, or control variable, in this experiment? The brand of cleanser that didn't work. (MY ANSWER) ...
Thursday, August 11, 2016 by LOVE

Science
It can be inferred from the passage that radioactive dating is important for estimating the age of A) all known meters B) all existing planets C) the earth D) the trees
Thursday, August 11, 2016 by Shelby

science
Torque due to action-reaction force is zero?
Thursday, August 11, 2016 by rihanna

Science
How to prepare 10mM NaH2PO4?
Thursday, August 11, 2016 by Chandandeep Kaur

science
Find the pressure exereted by a girl weighing 400N.standing on one heel of area 1cm square
Wednesday, August 10, 2016 by sahil

Science 1 question help plz thank you
Which of the following is not true about bias. A. Personal bias involves the influence of your own likes and dislikes B. Ethical bias involves basing a conclusion on too little data C. Cultural bias is influence from culture in which you grew up D. Experimental bias is a ...
Wednesday, August 10, 2016 by lilly

Science
1.How is scientific inquiry useful? 2.What does all scientific inquiry have in common? 3. define science and explain what scientists do.
Wednesday, August 10, 2016 by Senpai onii-chan

science
calculate the number of molecules of hydrogen and carbon present in 4 gof methane.
Wednesday, August 10, 2016 by sony

science
what is the value f g on moon?
Wednesday, August 10, 2016 by jazleen

science
calculate the mass of 120 cc of nitrogen at NTP. How many number of molecules are present in it?
Wednesday, August 10, 2016 by sandy

Science
Two forces whose magnitude are in the ratio 3 :5 gives resultant of 28. If the angle of their inclination is 60 °find the magnitude of each force
Tuesday, August 9, 2016 by Anonymous

science
A spring fixed at one end can be streched by hanging standard masses from the other end. What masses is needed to achieve a stretching force of 5N?
Tuesday, August 9, 2016 by Anonymous

Science
Which of the following is not a characteristic of life? A. maintains homeostasis B. composed of cells C. composed of atoms D. carries out metabolism C? Is that correct
Tuesday, August 9, 2016 by Amber

science
what is the ratio between acceleration and velocity?
Tuesday, August 9, 2016 by Anonymous

science
a 50 kg block is placed on an inclined plane with an angle of 30. then find the components of the weight (1)perpendicular (2)parallel to the inclined plane.
Tuesday, August 9, 2016 by shahanshah

science
How to prepare 250ml (n/10) sodium hydroxide solution (NaoH)
Tuesday, August 9, 2016 by Anime's

Science
Which of the following is true? Mark all that apply. A. a hypothesis can be proved incorrect through experiment B. conclusions cannot disprove a hypothesis C. conclusions are made based on the analysis of data D. opinion is used to analyze data Is it A and C?
Monday, August 8, 2016 by Amber

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