The ratio of the distances a 7iron and a 5iron will drive a golf ball is 5 to 6. If a golfer averages 153 yards with a 7iron how far should he average with a 5iron Express your answer as
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Chemistry Please Help
Iron is found in Earths crust as several different iron compounds. Calculate the mass (in kg) of each compound that contains 1.0 x 10E3 kg of iron. Fe2O3 Please help step by step

physics
A golf ball is struck with a five iron on level ground. It lands 92.7 m away 4.40 s later. What was (a) the direction and (b) the magnitude of the initial velocity?

Chemistry
The specfic heat of iron is 0.11cal/g C. The heat of fusion of iron, the heat required to convert iron from a solid to liquid at its melting point, is 63.7cal/g. Iron melts at 1530 C. How much heat must be added to 2g of iron at 25c to completely melt it?

grade 11 physics
A championship golfer uses a nine iron to chip a shot right into the cup. If the golf ball is launched at a velocity of 20 m/s at an angle of 45° above the horizontal, how far away was the golfer from the hole when he hit the ball? What maximum height did

History
What were the effects of the Zhou metal workers mastering iron? Select the two correct answers. A. The Zhou conquered the warlords and were the first to unify China. B. Iron made stronger, more effective farm tools and increased crop yield. C. Iron weapons

Chemistry
Iron ores have different amounts of iron per kilogram of ore. Calculate the mass percent composition of iron for each iron ore: Fe2O3{\rm Fe_2O_3} (hematite), Fe3O4{\rm Fe_3O_4} (magnetite), FeCO3{\rm FeCO_3} (siderite).

Chemistry
A student determines the iron (II) content of a solution by first precipitating it as iron (II) hydroxide, and then decomposing the hydroxide to iron (II) oxide by heating. How many grams of iron (II) oxide should the student obtain if her solution

math
the ratio of the distances a 7iron and a 5 iron will dirve a golf ball is 5 to 6. if a golfer averages 153 yards with a 7 iron, how far should he averages with a 5iron?

chemistry
Iron reacts with chlorine to form iron(iii)chloride. A)How many chlorines react with 1.86g of iron? B)What mass of iron(iii)chloride is produced?

Math
A famous golfer tees off on a straight 390 yard par 4 and slices his drive to the right. The drive goes 280 yards from the tee. Using a 7iron on his second shot, he hits the ball 180 yards and it lands inches from the hole. How many degrees (to

Chemistry
The ladle at an iron foundry can hold 8500 kg of molten iron; 646 metric tons of iron are needed to make rails. How many ladlefuls of iron will it take to make 646 metric tons of iron? (1 metric ton=1000 kg)

Chemistry
When 84.8 g of iron(III) oxide reacts with an excess of carbon monoxide, iron is produced. Fe2O3(s) + 3CO(g) ==> 2Fe(s) + 3CO2(g) what is the theoretical yield of iron?

World history; Check:P
How did environmental features in Anatolia help the Hittites advance technologically? The Hittites were the first to use iron for weapons, because the materials they needed were easily in the mountains of Anatolia. Iron was easy to get to for the Hittites

Chemistry
Iron is obtained from iron ore according to the following reaction: Fe2O3+CO> Fe+CO2 (unbalanced). a. Assuming the blast furnace is 90.0% efficient in recovering the iron, what is the actual mass of iron obtainable from a ton of ore? b. What is

chemistry
A 0.1943g iron ore sample was dissolved in hydrochloric acid and the iron was obtained as Fe 2+ (aq). The iron solution was titrated with Ce 4+ solution according to the balanced chemical reaction shown below.After calculation, it was found that 0.0237 g

Physical science
A hot iron ball is dropped into 200g of cooler water. The water temperature increases by 2.0 degrees C and the temperature of the ball decreases by18.6 degrees C. What is the mass of the iron ball?

MATHS
James pays $120.00 for golf clubs that are on sale for 20% off at Golf Pros. At Nine Iron, the same clubs cost $8.00 less than they cost at Golf Pros. They are on sale for 13% off. What is the original cost of the clubs at Nine Iron?

chemistry
1125 J of energy is used to heat 250 g of iron. After heating, the final temperature of the iron is measured as 55 °C. The specific heat capacity of iron is 0.45 J/(g·°C). What was the initial temperature of the iron? A. 45 B. 55 C. 20 D. 35 I don't

Chemistry
7) A 3.33 g sample of iron ore is transformed into a solution of iron (II) sulfate. And this solution is titrated with 0.0150 M potassium dichromate. If it requires 41.40 mL potassium dichromate solution to titrate the FeSO4, find the percentage of iron in

Science
A magnet was placed near a pile that contained both iron and sulfur. The magnet was moved gradually closer to the pile. As it neared the pile, the magnet started attracting small pieces of iron from the pile. What best describes? A. Solution or iron and

12th grade chemistry
A piece of iron wire weighs 2.225g. It is dissolved in acid, which oxidizes the iron to iron(II), and made up to 250 mL. A 25mL sample required 31.0 mL of a 0.0185mol/L solution of potassium dichromate. Calculate the percentage of iron in the wire.

chemistry
How many grams of iron are needed to produce 42.8 L of hydrogen gas according to the following reaction at 25oC and 1 atm? iron (s) + hydrochloric acid (aq) iron(II) chloride (aq) + hydrogen (g)

Intro to algebra
The ratio of the distances a pitching wedge and an 8iron will drive a golf ball is 4 to 5. If a golfer averages 140 yards with a pitching wedge, how far should she average with an 8iron?

ChemistryEquation
When iron rusts in air, iron(III) oxide is produced. How many moles of oxygen react with 2.4 mol of iron in the rusting reaction?

science
The ladle at an iron foundry can hold 8500 kg of molten iron. You need 646 metric tons of iron to make rails. How many ladlefuls of iron will it take to make 646 metric tons of iron? (note  1 metric ton = 1000 kg

Physics
A golf ball is struck with a five iron on level ground. It lands 91.4 m away 4.20 s later. What was (a) the direction and (b) the magnitude of the initial velocity? angle=tan1(Ry/Rx) for direction R=(Rx^2+Ry^2)^(1/2) I cannot figure out the variables and

Chemistry
Iron reacts with sulfur to form a sulfide. If 2.561 g of iron reacts with 2.206 g of sulfur, what is the simplest formula of the sulfide? I don't know how to go about doing this problem. The answer is Fe2S3. Calculate the moles of iron in 2.561 grams of

chemistry
The rusting of iron is represented by the equation 4Fe + 3O2 2Fe2O3. If you have a 1.75mol sample of iron, how many moles of Fe2O3 will there be after the iron has rusted completely?

Physical Science 2
Given that iron has a density of 7.87 g/cm3, calculate the volumeof 100 g of iron and 50 g of iron

Chemistry
If the decomposition of 3.785 g iron (III) chloride yields 1.302 g iron and 2.483 g chlorine, how many grams of iron and chlorine are produced when 2.175 g iron (III) chloride decomposes?

MATH
The ratio of the distances a 7iron and a 5iron will drive a golf ball is 5 to 6. If a golfer averages 153 yards with a 7iron how far should he average with a 5iron Express your answer as an integer or mixed number. 183.6 The appliance store where the

calculus
I need help with this problem: The path traveled by a golf ball with a 9iron can be modeled with the quadratic equation, y= 0.042xsquared + 5x, where x is the distance in yards from the point it was hit and y is the height of the golf ball in feet.

Physical Science
A hot iron ball is dropped into 200.0 g of cooler water. The water temperature increases by +2.0°C and the temperature of the ball decreases by 18.6°C. What is the mass of the iron ball?

chemistry
Find iron on the periodic table. Iron has many isotopes. Based on the information given on the periodic table for iron, what isotope of iron is the most common isotope found in nature? Explain your answer.

chemistry
If the decomposition of 3.785 g iron (III) chloride yields 1.302 g iron and 2.483 g chlorine, how many grams of iron and chlorine are produced when 2.175 g iron (III) chloride decomposes?

Chemistry
Equation: Fe+CuCl2>FeCl2+Cu We put two iron nails into the copper chloride solution:1. mass of empty dry beaker:103.64 2. mass of two iron nails, before reaction:1.20 3. mass of two iron nails after reaction: 1.01 4. mass of beaker and copper (dry):104.4

Chemistry
A 0.020 M KMnO4 solution was used to determine the percent iron in a sample containing iron(II). MnO− 4 + 5 Fe2+ + 8 H+ → Mn+2 + 5 Fe3+ + 4 H2O It took 25.0 mL of the KMnO4 to completely react with all the iron(II) in the 0.500 g sample. What was the

physics
A steam iron draws 6.5 A when connected to a potential difference of 120 V. (a) What is the power rating of this iron? 1 W (b) How many joules of energy are produced in 20.0 min? 2 J (c) How much does it cost to run the iron for 20.0 min at $0.014/kW·h? $

MTH 156
The ratio of the distances a 7iron and a 5iron will drive a golf ball is 5 to 6. If a golfer averages 153 yards with a 7iron, how far should he average with a 5iron

math
Write the numbers in order of increasing size. 1/2,3/4,2/3,0.95 Convert to standard notation. 1.91 x 104 The ratio of the distances a 7iron and a 5iron will drive a golf ball is 5 to 6. If a golfer averages 153 yards with a 7iron how far should he

MATH
The ratio of the distances a 7iron and a 5iron will drive a golf ball is 5 to 6. If a golfer averages 153 yards with a 7iron how far should he average with a 5iron Express your answer as an integer or mixed number. 183.6 The appliance store where the

PHYSICSSS
The average velocity a golf ball hit with an iron is about 66.7 m/s. Calculate the maximum height and displacement of the golf ball if it is hit with a 45 degree 9 iron

Chemistry
I looked and could not find anything on iron smelting? Could you explain to me why it is a chemical process? Iron ore is a chemical compound, it has to be decomposed into iron + other. Surely you jest!!! I went to www.google.com and typed in Iron smelting

Physics help
A blacksmith at a historical reenactment is making an iron hinge. after placing the iron (0.750 kg) in the fire and shaping it with his hammer it is still at 200 C. he puts the iron piece in an 8 L bucket of water at 25 C. what is the final temp. of the

Physics help please
A blacksmith at a historical reenactment is making an iron hinge. after placing the iron (0.750 kg) in the fire and shaping it with his hammer it is still at 200 C. he puts the iron piece in an 8 L bucket of water at 25 C. what is the final temp. of the

chemistry
Iron(III) oxide can be reduced to metallic iron by heating it in the presence of carbon. Balance the following equation, then determine the ratio of C to Fe in the reaction? Fe2O3 + C → Fe + CO2?

science
Iron is obtained by reduction of iron(iii)oxide gas in a blast furnace.calculate the amount of iron(iii)oxide needed to produce 100tonnes of iron.

Algebra
The density of iron is 7.87 g/cm3, and the average mass for one iron atom is 9.28×1023 g. How many atoms are there in a rectangular iron ingot measuring 3.00 cm × 3.00 cm × 9.00 cm?

chemistry
when iron rusts in air, iron(III) oxide is produced. how many moles react with 2.4 iron in the rusting reaction? 4Fe(s) + 3O2(g) => 2Fe2O3(s)

Chemistry
When iron rusts in air, iron (III) oxide is produced. How many moles of oxygen react with 7.2 mol of iron in the rusting reaction? 4Fe(s)+3O2=2Fe2O3(s)

Algebra
Ainsley is trying to eat more vitamins and minerals. She checks the nutrition labels on two different brands of soup. Brand A has 40 percent of the daily value of iron in a 2cup serving. Brand B has 30 percent of the daily value of iron in a 1cup

Physics
Alexis Farias realizes her dream to play golf on the moon. She hits a golf ball with an initial velocity of 23.5m/s at an angle of 35.0 degrees above the horizontal. The acceleration due to gravity on the moon is 1.67m/s^2. A). How long is the golf ball in

chemistry
3960 J of heat are added to a 27.6 g sample of iron at 25 ◦ C. What is the ﬁnal temperature of the iron? The speciﬁc heat of iron is 0.449 J/g · K. Answer in units of K

math ratio
The ratio of the distances a driver and a 2 iron can propel a golf ball is 5 to 4. If a golfer averages a distance of 200 yards with a 2 iron, how far should she average with a driver. I get 250 yards is that right? 5/4=x/200 is ratio setup

chemistry
Rust contains an ironoxygen compound in which there are three oxygen atoms for each two iron atoms. In this compound, the iron to oxygen mass ratio is 2.325:1. Another compound of iron and oxygen contains these elements in the ratio of 2.616:1. What is

math
Cohen has consistently averaged 120 yd. of horizontal distance with his 7iron over the last two years playing golf. His ball flight typically reaches a maximum height of 24 yd. (Hint: A rough sketch will help you) a.) Create a function in vertex form that

PROBLEM SOLVING IN MATHEMATICS
you have 6 iron balls. 5 iron balls have equal weight and 1 iron ball is slightly lighter than the other 5 iron balls. you are given a libra. find ways (most minimum) to find out the light.

science
you have a ball of steel and a ball of iron both of the same volume. The ball of of steel has a larger mass. Is it denser, less dense, or does it have the same density as the ball of iron. Explain.

science
you have a ball of steel and a ball of iron both of the same volume. The ball of of steel has a larger mass. Is it denser, less dense, or does it have the same density as the ball of iron. Explain.

physics
A 9.0 kg iron ball is dropped onto a pavement from a height of 110 m.If half of the heat generated goes into warming the ball, find the temperature increase of the ball. (In SI units, the specific heat capacity of iron is 450 J/kg*degree C.)

kvb
Sam hits a golf ball with a fiveiron a distance of 120 m horizontally. A tree 45 m high and 35 m in front of Sam is directly in the path of the ball. Will the ball clear the tree if the ball makes a parabolic curve and has maximum height of 80 m?

chemistry
Solud iron and steam react at high temperatures to form iron(vi) peroxide and hydrogen gas. How much solid iron is needed to obtained 405 grams of iron(vi) peroxide, with a 84.2% yield?

chemistry
Solud iron and steam react at high temperatures to form iron(vi) peroxide and hydrogen gas. How much solid iron is needed to obtained 405 grams of iron(vi) peroxide, with a 84.2% yield?

Physics
A golf ball is struck with a five iron on level ground. It lands 85.0 m away 4.60 s later. What was the magnitude and direction of the initial velocity

chemistry 11 grade
A piece of iron wire weighs 2.225g. It is dissolved in acid, which oxidizes the iron to iron(II), and made up to 250 mL. A 25mL sample required 31.0 mL of a 0.0185mol/L solution of potassium dichromate. Calculate the percentage of iron in the wire.

Dr. Bob
Okay now can you read my introduction for me please... INTRODUCTION: This report discusses an experiment to study the percent mass of iron determined by the concentration of a colored iron solution from the absorbance of the spectrometer. This lab is

health
what three vitamins and minerals undergo the greatest percentage increase during pregnancy?1.vitamind,iron,folicacid 2.iron,folicacid,calcium 3.iron,folicacid,vitaminb6 4.vitamind,iron,calcium 5.iodide,iron,niacin

CHECK my answers Physical science
10. If a solid piece of iron is heated and remains at 80°C until it is completely melted, you know that 80°C is (2 pts) * a. the freezing point of iron b. the melting point of iron c. the boiling point of iron d. both the freezing and melting points of

science
I'm posting this again because the answer I got last time made no sense to me. Peter looked on his cereal box, he saw that it read 'contains added iron.' Peter wanted to see the iron in his food. Peter got out a magnet, and the iron came to the top of the

Mathematics
Tau,Igo and Iron share a bag of mangoes in the ratio 7:5:14,if Igo receives 18 mangoes less than Iron, how mangoes does Iron receive?

Engineering
Here we consider instead dissolving guns (which we will assume are pure iron) with sulfuric acid. Fe+H2SO4>FeSO4+H2 It is apparent that they must use an outside source of electrical power to drive the dissolution of the iron. They use a small current so

Chemistry (specific heat)
1125 J of energy is used to heat 250 g of iron. After heating, the final temperature of the iron is measured as 55 °C. The specific heat capacity of iron is 0.45 J/(g·°C). What was the initial temperature of the iron?

AP Chem 
Iron59 has a halflife of 45.1 days. How old is an iron nail if the Fe59 content is 25% that of a new iron sample? Please show the calculating so I can learn to do it.

AP Chem 
Iron59 has a halflife of 45.1 days. How old is an iron nail if the Fe59 content is 25% that of a new sample of iron? Please show the calculating so I can learn to do it.

Chemistry
if 6.5kJ of energy are added to 56.4g sample of iron at 24 degrees C what is the final temperature of the iron? The specific heat of iron is 0.449j/gC

Chemistry
Iron 59 has a half life of 45.1 days. How old is an iron nail if the Fe59 content is 25% that of a new sample of iron? Show all calculations leading to a solution.

Chemistry
What colour and formula are the iron 2+ & iron 3+ chloride complexes? http://en.wikipedia.org/wiki/Iron(III)_chloride

Physical Science 9
What is the chemical equation for the rusting of iron carbide. I tried it myself,but I ended up with iron hydroxide rather than iron oxide. Help, Please, and thank you.

Chemistry
The dusting of iron is represented by the equation 4fe3 +3o2 —2fe2o3. if you have 1.8 mol sample of iron how many moles of fe2o3 will there be when the iron has completely rusted

Chemistry
Iron 59 has a half life of 45.1 days. How old is an iron nail if the Fe59 content is 25% that a new sample of iron? Show all calculations leading to a solution. Can you work the problem? I don't know how to solve for t!!! Please.

math
A country has 135 years of iron reserves at the current rate of consumption. Suppose that the demand for iron in the country is 10,000,000 tons per year. Furthermore the iron is consumed at a rate that increases 7.5% per year. (a) How long will the iron

Physics 1
A golf ball is struck with a five iron on level ground. It lands 92.0m away 4.20s later. What was (a) the direction and (b) the magnitude of the initial velocity? I have no idea how to go about using the information given to find the first part (A). Even

chemistry
Iron59 has a halflife of 45.1 days. How old is an iron nail if the Fe59 content is 25% that of a new sample of iron? Show all calculations leading to a solution. I am really confused on how to find t here? Can someone help? I can set up the rest of the

Chemistry
A 67gr mass of solid iron is heated by a flame until the temp of the iron equals the temp of the flame. The solid iron is then dropped into 250gr of liquid water at 26 degrees C. After 5 mins, the iron and the water are both at 47 degrees C. Specific heat:

mechanical behaviour of materials
Iron carbide (Fe3C) particles are dispersed in iron. The surface energy of Fe3C is 2J/m2, the shear modulus of iron is 64GPa and the Burgers vector of iron is 0.25nm. What minimum surface energy of the obstacle is required to induce dislocations to be

Redox Titration questions!
Oh goodness, I'm such a pain! I need some help with these! How do I calculate the percentage? How do I start it? 2. Imagine that you ran a similar titration using a different iron sample with 0.02 M KMnO4 as the titrant. Calculate the percent of iron in

chemistry
15. Liquid elemental iron is produced in the thermite reaction because enough heat is generated to melt the iron: 2 Al(s) + Fe2O3(s)> Al2O3(s) + 2 Fe(l) What mass of aluminum is needed to produce 750 grams of iron?

chemistry
Liquid elemental iron is produced in the thermite reaction because enough heat is generated to melt the iron: 2 Al(s) + Fe2O3(s)> Al2O3(s) + 2 Fe(l) What mass of aluminum is needed to produce 750 grams of iron?

physics
A golf ball (m = 35.4 g) is struck a blow that makes an angle of 61.8 ◦ with the horizontal. The drive lands 176 m away on a flat fairway. The acceleration of gravity is 9.8 m/s 2 . If the golf club and ball are in contact for 3.01 ms, what is the

chemistry
Iron59 has a halflife of 45.1 days. How old is an iron nail if the Fe59 content is 25% that of a new sample of iron? Show all calculations leading to a solution. Is this how you would do this? (100/25) = 0.693 times (45.1) 4= 31.2543 final answer is

Chemistry
A couple questions here: 1. How do you expect nitriding to change the properties of iron? a) Nitriding makes iron stronger. b) Nitriding makes iron weaker. c) Nitriding makes iron more electrically conductive. d) Nitriding makes iron less electrically

Science
Peter looked on his cereal box, he saw that it read 'contains added iron.' Peter wanted to see the iron in his food. Peter got out a magnet, and the iron came to the top of the flakes. They were tiny pieces of black. Why did the iron come to the top of the

chemistry
an iron supplement is used to treat anaemia and 50mg of iron 2 is required per tablet.if the iron compound used in the tablet is FeSO4.7H2O,what mass of this compound would be required per tablet to provide the desired amount of iron 2?

Chemistry
1125 J of energy is used to heat 250 g of iron to 55 °C. The specific heat capacity of iron is 0.45 J/(g·°C). What was the temperature of the iron before it was heated? 55 °C 35 °C 20 °C 45 °C Not sure how to solve this problem, can anyone walk me

science
A 30g iron bar at 100degreeC is placed in 200 g of water at 20degreeC. If the specific heat capacity of iron is 0.11 cal/gdegreeC, to what final temperature will the iron bar cool?

Chemistry
3490 J of heat are added to a 20.4 g sample of iron at 20◦C. What is the final temperature of the iron? The specific heat of iron is 0.449 J/g · K. Answer in units of K.

Math
Under the rules of the United States Golf Association the volume of a golf ball cannot be less than 2.48 cubic inches. A. calculate the radius of this golf ball. B. Calculate the circumference of this golf ball *Please help i don't know how to do this!!*

CHEMISTRY
A 70g sample of iron ore(Fe2O3) was analyzed for Iron and found to contain 1700 Fe. Calculate the percentage of iron in the sample.

Ap physics
A steam iron draws 6.5 A when connected to a potential difference of 120 V. (a) What is the power rating of this iron? 1 W (b) How many joules of energy are produced in 20.0 min? 2 J (c) How much does it cost to run the iron for 20.0 min at $0.014/kW·h? $

Science
Pineapple has high requirements for the fertilizer elements nitrogen (N), potassium (K), and iron (Fe), and relatively low requirements for the fertilizer elements phosphorus (P) and calcium (Ca). Although Hawaiian pineapples grow in red soils whose iron