3,135 Answered Questions for the topic Science

20h

Crop rotation (finding source)
Question: Why is crop rotaion important?- What are 2 primary sources for this topic?- What are at least 2 different kinds of secondary sources? Make sure one of them is a peer-reviewed article from... more
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1d

my homework is due in a few hours and I am confused. Please... help... quickly!
Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.   ­­2NaClO3­ --> 2NaCl +3O2  How many grams of NaClO3­ were needed to produce 6 grams of O2? Round... more
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1d

Please, Read the Question Below :)
A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 594 N. As the elevator later stops, the scale reading is 386 N. Assume the magnitude of the... more
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1d

Please, Read the Question Below :)
You can feel a force of air drag on your hand if you stretch your arm out of the open window of a speeding car. [Note: Do not endanger yourself by performing this experiment.] Calculate this force,... more
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1d

Please, Read the Question Below :)
The mass of a sports car is 1400 kg. The shape of the car is such that the aerodynamic drag coefficient is 0.250 and the frontal area is 2.30 m2. Neglecting all other sources of friction, calculate... more
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1d

(a) A sphere made of plastic has a density of 1.08 g/cm^3 and a radius of 7.50 cm. It falls through air of density 1.20 kg/m^3 and has a drag coefficient of 0.500. What is its terminal speed (in m/s)?
(b) From what height (in m) would the sphere have to be dropped to reach this speed if it fell without air resistance?
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2d

(Stoichiometry)
1 C₅H₁₂(g) + 8 O₂(g) → 5 CO₂(g) + __ H₂O(g) when balancing the above equation, how many moles of water are produced when 1 mole of C₅H₁₂ reacts with excess Oxygen Gas? 
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2d

(Stoichiometry)
1 C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(g) - Identify the Limiting Reactant in the following problem and identify how much of the excess reactant remains after the reaction has reached completion.... more
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2d

Mass of CaCl2: 10,0 g Mass of Na2CO3: 10.0 g Actual amount collected: 2.00 g CaCO3 1. Write a balanced chemical equation.

A student performs a lab at school. They massed out both reactants and then mixed them together. The reaction produced a precipitate. They filtered out the product and took the mass of it. (I'm a... more
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3d

Adipic acid, H2C6H8O4, used to produce nylon, is made commercially by reaction of Cyclohexane (C6H12) and oxygen gas (O2).
a. write the balanced chemical equation for the given reaction above.b. is the reaction exothermic or endothermic? Explain.c. how many grams of Adipic acid will be formed if 25.0g cyclohexane... more
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3d

H2SO4 + 2 NaOH = Na2SO4 + 2 H2O How many grams of Na2SO4 could be produced from 4.94 moles of sulfuric acid?
Grateful for any help given!
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3d

C2H6 + 7O2 = 4 CO2 + 6 H2O If you wanted to produce 5.83 moles of carbon dioxide, how many moles of oxygen would you needed to have started with?
Grateful for any help given!
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3d

2 C2H6 + 7O2 = 4 CO2 + 6 H2O If 0.31 moles of H 2 O were produced, how many moles of carbon dioxide would also have been produced?
Grateful for any help given!
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4d

2 NABr + Ca(OH)2 = CaBr2 + 2 NaOH How many moles of CaB 2 are produced, if 14.72 moles of NaBr and excess Ca(OH) 2 react?
Grateful for any help given!
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4d

2 NABr + Ca(OH)2 = CaBr2 + 2 NaOH What was the initial mass of calcium hydroxide for a reaction that produced 52.9 g of NaOH?
Grateful for any help given!
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4d

4. As concentration increases, what happens to the number of ions in the solution? URGENT CHEMISTRY QUESTION
please help me with this chemistry concept and question.
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4d

How does the concentration of ions in a strong base differ from a weak base? CHEMISTRY URGENT
please help me explain this chemistry concept
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4d

Which ions are most abundant in water? - Chemistry URGENT  
Please help me explain this chemistry question.
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4d

What is the density of NH3 at 335 K and 104 kPa?
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4d

What is the mass of a sample of neon gas that has a pressure of 0.77 atm, a volume of 18.95 L, and a temperature of 295 K?
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4d

What is the volume of 17.88 mol of argon gas at STP?
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4d

What volume does a 24.00 gram sample of helium gasoccupy at a pressure of 1.60 atm and at a temperatureof123°C?
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4d

What is the pressure (in kPa) of a 0.055 mol sample of krypton gas that has a temperature of 188°C and a volume of 0.57 L?
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4d

A sample of gas has a volume of 3.91 L, a temperatureof 305 K, and a pressure of 2.09 atm. How many moles of gas are present in the sample?
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4d

A sample of gas has a volume of 3.91 L, a temperatureof 305 K, and a pressure of 2.09 atm. How many moles of gas are present in the sample?
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