When iron metal reacts with oxygen, the reaction can form Fe203. The balanced chemical equation I think is right is 4 Fe + 302----2Fe203. So I have 4 moles of iron + 3 moles of oxygen creates 2 moles of iron oxide. I need to find the number of moles of oxygen that are needed ...
Friday, November 11, 2016 by Steve
4. Which of the following statements is true? A. Biodiversity provides additional resources that raise the carrying capacity of an ecosystem B. Biodiversity increases an ecosystems ability to withstand changes C. Biodiversity makes an ecosystem more difficult to destroy D. ...
Friday, November 11, 2016 by Embershy
1. An organism's particular role in its habitat, or when and how it survives, is called its A. Carrying capacity B. Ecosystem C. Competition D. Niche*** 2. Which of the following is an example of a predator adaption? A. A lion's pheromones B. A shark powerful jaws*** C...
Friday, November 11, 2016 by Embershy
I really need help on this project. I am not asking for all of the answers, I just need someone to explain what I should do for this experiment. And how to make a data table. Directions: 1. Design an experiment to support the hypothesis that light travels in straight lines ...
Friday, November 11, 2016 by Melinda May
An aeroplane of mass 5000 kg is flying at an altitude of 3 km. If the area of wings is 50 m^2 and pressure at the lower surface of wings is 60000 PA,the pressure on the upper surface of wings is
Friday, November 11, 2016 by Jaideep
Materials: Epsom salts (MgSO4), ammonia (NH4OH) small jar or cup measuring cup Procedures 1. Dissolve 1 teaspoon of Epsom salts in a half cup of water. 2. Add 2 teaspoons of ammonia to the Epsom salts solution and stir thoroughly. Record your observations. 3. Allow the mixture...
Friday, November 11, 2016 by Steve
I'm doing a lab report, and we are looking at an onion cell under a microscope. The teacher asks to explain why we put iodine on the sell. (ANSWER)= Cleaning it ?
Thursday, November 10, 2016 by I need Help Now
Question 1- how does a multicellular organism develop? A- the cells differentiate. B- The cells shrink. C- One cell grows bigger. D- The cells replicate to form exact copies. <<<<
Thursday, November 10, 2016 by PLS HELP QUICK DONT HAVE TIME
A 10 ohm, 20 ohm lamp and 12v battery are connected in a parallel. A current of 1.8 A passes through the battery and a current of 1.2 A passes through the motor. 1) Determine the current through the lamp. 2) Calculate the potential difference across the motor. 3) is this the ...
Thursday, November 10, 2016 by Tina
In a tennis match the player hits the ball to serve the ball travels 24m from the servers raquet to the opponents Raquet at an average speed of 40 meters per second.calculate the time taken
Thursday, November 10, 2016 by Alex
Unit 3 Test Multiple Choice Please select the correct response for the following questions. 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. ...
Thursday, November 10, 2016 by Becky
Science - Electrochemistry
In an experiment 0.0500 M AgNO3 was used to titrate 20 mL of 0.12 M NaCl solution. When silver electrode is used together with the pH electrode to measure potential at each point during the titration, the potential measured at equivalence point is 0.055 V. Unfortunately, a ...
Wednesday, November 9, 2016 by Sarah Lee
a bullet is shot from a springfield rifle with a speed of 3,015 ft/s. assuming the bullet moved at a constant velocity, what is the time required for the bullet to strike a target 4,146 meters away
Wednesday, November 9, 2016 by chris
I can't figure out some of them, and I need help! m - 7 < 6 1. m< -13 ** 2. m< 1 3. m< -1 4. m< 13 n - 8 > 5 1. n> 13** 2. n> 3 3. n> -3 4. n> -13 p + 5 < 10 1. p < -15** 2. p < 5 3. p < 15 4. p < -5 The science class is taking...
Wednesday, November 9, 2016 by HELPPPPPPPPPP
Four students dissolved 30g of salt in a 200ml solution of water.Each student heated his or her water solution to a different temperature ( Marcus had 10 and tyra had 25 Luis had 50 and Andrew had 75) which student most likely had the solution with the fastest dissolving rate ...
Tuesday, November 8, 2016 by Kate
â¢Explain the process of succession â¢Describe how changes in an ecosystem can affect organisms that live there â¢Describe the amount of time needed for ecosystem recovery What are the dependent and independent variables? ...
Tuesday, November 8, 2016 by Embershy
Which of the following correctly identifies active transport? A. Transport proteins move large molecules from areas of low. B. Transport proteins move large molecules from areas of low concentration areas of high concentration areas without the use of cellular energy. C.Small ...
Tuesday, November 8, 2016 by Ive
Science PLEASE PLEASE HELP
Which of these statements about saltwater is correct? Saltwater freezes at a lower temperature Saltwater freezes at a higher temperature Saltwater does not freeze at any temperature Saltwaters freezing point depends on the temperature of the ocean floor***** PLEASE HELP ME
Tuesday, November 8, 2016 by ovais
Science HELP PLS
1. What is a Genetic Mutation? A. the process of decreasing chromosome numbers to half of what the parent cell has B. the copying of DNA to form identical daughter cells C. a permanent change in an organismâs genetic code D. a fusion of egg and sperm cell to ...
Tuesday, November 8, 2016 by Jia
Assume that the lower troposphere is isothermal with a temperature TA. An airparcel at the surfaceis heated isobarically to a temperature of T0 and then released and allowed to ascend dryadiabatically. Assume that the buoyancy is the only force acting on the parcel and that ...
Tuesday, November 8, 2016 by Angela
1. What type of reproduction results in offspring being identical to the parent? A)sexual reproduction B)genetic engineering C) unicellular D)asexual reproduction 2. Which of the following is an example of sexual reproduction? A)a lizard growing a new tail B)a chicken laying ...
Monday, November 7, 2016 by Hayden
You purchase a computer for $875.00 plus 5% sales tax. You decide to finance it through the store's 0% program for 12 months. The terms state you pay nothing until the 12 months are over. When you receive the bill, you forget to pay it and are assessed a late fee of $39.00...
Monday, November 7, 2016 by Naphratite
A metal from group 1 and a nonmetal from group 17 are? A. Not likely to bond. B. Likely to form a covalent bond. C. Likely to form an ionic bond.*** D. Likely to form a metalloid. Is this correct?
Monday, November 7, 2016 by Sam
Every year, Eli and his family visit the Great Sand Dunes desert in Colorado. Eli notices that more sand dunes with varied shapes and sizes appear each year. Explain what causes this phenomenon. Plz answer thoroughly and detailed and DO NOT use Wikki.
Monday, November 7, 2016 by Agala
Consider the diatomic molecule Na2. For simplicity let the basis set consist of the orbitals: and . In the molecule the overlap integral between the 3s orbitals is 0.45. Answer the following questions using the orbital energies determined using the Revised Slaterâ...
Sunday, November 6, 2016 by Soso
The probability P, as a percent, that a certain computer keyboard in a public library will last more than t years can be approximated by P = 100e^â1.2t. After how many years will the probability of keyboard failure be 76%? Round to the nearest tenth.
Sunday, November 6, 2016 by Dale
1. The water cycle is the _____. A. distribution of drinking water on Earth ?**? B. unending circulation of Earth's water supply ?**? C. the recycling of water after industrial use ?**? D. the evaporation of water from Earth's surface ?**? 2. Plants release water into ...
Sunday, November 6, 2016 by PleaseHelpMe777
1.) What is the relationship between temperature and the rate at which antacid tablets react with water? 2.) Form a hypothesis about the relationship between temperature and the rate of chemical weathering. 3.) Would a limestone building weather more rapidly in Homer, Alaska, ...
Saturday, November 5, 2016 by PleaseHelpMe777
Particles of mass 3m and 5m hang one at each end of a light inextensible string which passes over a pulley.the system is released from rest with the hanging parts taut and vertical.during the subsequent motion the resultant force exerted by the string on the pulley is of ...
Saturday, November 5, 2016 by nishat
a stone is thrown at an angle of 30* with the horizontal direction which strikes the tip of the building 2 m height ,if the distance of the building from the point of observation is 10 metre .find the velocity of the projectile of the stone. ans...
Friday, November 4, 2016 by nirmal kumar
a stone is thrown at an angle of 30* with the horizontal direction which strikes the tip of the building 2 m height ,if the distance of the building from the point of observation is 10 metre .find the velocity of the projectile of the stone.
Friday, November 4, 2016 by nirmal kumar
Pedro spent 2 1/5 hours on his math himework and half as lomg on his science homework one weekend. If his english and social studies homework took 7/8 as long, how much time did he spent on homework that weekend?
Friday, November 4, 2016 by Anthony
During a science experiment, Nico created a 32%alcohol solution by mixing 8 fluid ounces of a 50% alcohol solution with a certain amount of an 8% alcohol solution. How many fluid ounces of the 32% alcohol solution did he create?
Friday, November 4, 2016 by Jj
A stone projected vertically upwards with a velocity of 20m/s. Two seconds later, a second stone is similarly projected with the same velocity. When the two stones meet, the second one is rising at a velocity of 10m/s. Neglecting air resistance, calculate the (i) lenght of ...
Thursday, November 3, 2016 by Nifes
A community obtains electricity from a coal plant. This coal plant produces pollution that has caused environmental problems in the lakes, streams, and forests within the community. What kind of secondary pollution has the coal plant most likely produced, and what kinds of ...
Thursday, November 3, 2016 by Solara
1. With what materials are most houses in MÃ©rida built? A. wood and plaster B. stone and concrete blocks C. wrought iron 2. Which of the following is the correct Spanish word for "bed"? A. la cama B. el closet C. el dormitorio 3. What is not true about ...
Thursday, November 3, 2016 by YunoGasai
A 6 kg black is placed at the very top of a ramp that is inclined at 31 degrees and the block is released to slide down the ramp. As the block slides friction exerts a constant resistive force of 17N directed back up the ramp What is the block's speed when it arrives at ...
Wednesday, November 2, 2016 by Amy
name two types of evidence used to support the theory of evolution explain how scientists use each type of evidence to provide support for evolution give one example for each
Wednesday, November 2, 2016 by LEgit_VIPer
How is a parallel circuit different from a series circuit? A: A parallel circuit only has one path for the circuit to take. B: A parallel circuit has more than one path for the circuit to take.** C: A parallel circuit has a broken path for the circuit to take D: A parallel ...
Wednesday, November 2, 2016 by Marry Hernandez
Which of the following subjects enabled artists to begin using clay to form art? 1. Language arts 2. Social Studies 3. Mathematics 4. Science *** I think its D.
Wednesday, November 2, 2016 by Check this? Please...?
A species that influences the survival of many other species is an ecosystem is called a(n) (A) Niche species (B) Extinct species (C) Keystone species (D) Endangered species
Wednesday, November 2, 2016 by 220134
Students were given materials to complete a circuit to turn on one light. The materials received were 2 wires,AA battery, and various sizes lightbulbs.What is the variable in the experiment? Wires,battery, size of lightbulb, or time of day
Tuesday, November 1, 2016 by Terry