# Homework Help: Science: Chemistry

## Recent Homework Questions About Chemistry

chemistry
How many grams of aluminum is produced from the decomposition of 34grams of aluminum oxide

Chemistry
If I heated NaNO3, would there be yellow gas inside the test tube?

chemistry
Hi I was wondering if this equation is reversible and be written lime this: NaNO3 + H2O ⇋ NaOH + HNO3 Thanks!

Chemistry
In a reaction Mg(s) + 2HCl(aq) →H2(g) + MgCl2(aq), 6.00 g of Mg was present at 0.00 min. After 3.00 min, 4.50 g of Mg remained. Express the average rate as mol of Mg consumed per minute.

Chemistry
I have asked this question before but I was not clear enough. I want to prepare a 37% w/w solution (in water)of sulfuric acid from 96% sulfuric acid. I need around 500ml, I know it won't be exactly that, I want to know how to use the conversion using density, I've been shown a...

chemistry
Determine the [OH^-] of a solution that is 0.145 M in CO3^2-.

Chemistry
The specific heat of silver is 0.24 J/g*C. If 15.4 g of silver absorb 332 J heat, how much will the temperature of the silver increase?

Chemistry
2CO(g) = 2C(s) + O2(g). A sample of 0.882g of carbon monoxide, CO(g), is completely decomposed in a calorimeter containing 325 g of water. The initial temperature is 17.60*C, and the final temperature is 74.21*C. Calculate the enthalpy change in J/mol of reactant. I hope that'...

Chemistry
Given the equation 2SO2(g) +O2(g) -> 2SO3(g), H = -197.8 kJ per Mole, find the quantity of heat transferred when 8.54 grams of sulfur dioxide react completely. I'm stuck. Please help >-<

Chemistry
Hi, I have few questions from a chemistry lab that i did, 1) I'm not sure whats the point of heating a nitrate (NaNO3) 2) I'm not sure why you add NaOH to NaNO3 after it has dissolved in water 3) I'm not sure why do we have to test what gas is produced from calcium hydroxide ...

Chemistry
A 3.4g sample of h2o2 solution containing x% H2O2 by mass requires x ml of a KMnO4 solution for complete oxidation under acidic condition. The molarity of KMnO4 solution is: a)1 b)0.5 c)0.4 d)0.2

Chemistry
how many sulfate ions are in 30 formula units of aluminum sulfate?

Chemistry
Calculate the work done when 36.0 g of tin dissolves in excess acid at 1.00 atm and 30.1 C.

Chemistry
what compound is the result of silver nitrate and potassium bromide

Chemistry
What are the products of the neutralization reaction between hydrochloric acid and magnesium hydroxide? a. MgCl and H2O b. MgCl2 and H2O**

maths, geography, physics, chemistry
A cuboid has TSA 40 sq. m and latral surface 26 sq. m. Find the base area.

Chemistry
A sample of 76 g of NaCl is dissolved to make 1 L of solution. What is the morality of the solution? How do I get started solving this problem?

chemistry
m(ZnO) - ? m (HCl) - ? w(HCl) = 5% m(ZnCl) = 13,64 gram

chemistry
CH3-C(triple bond)C-CH-(C2H5)CH3product a and product b

chemistry
CH3-C(triple bond)C-CH-C2H5-CH3product a and product b

chemistry
a gas occupies a volume of 50.0mL at degrees Celsius and 630mmHg.at what temperature in degrees Celsius would the pressure be 101.3kPa if the volume remains constant?

chemistry
determine d no of moles in d following samples 2.5*10

Chemistry
A.) Write a balanced chemical Eq'n for a reaction between MAGNESIUM & HYDROCHLORIC ACID. Answer: Magnesium + Hydrochloric Acid Mg (s) + 2 HCL (ag) ---- MgCl2 (aq) H2(g) B.) Assuming 7.00 g of Magnesium completely react according to the above Eq'N, calculate the MOLES of ...

chemistry
If 120. g of propane, C3H8, is burned in excess oxygen according to the following equation: C3H8 + 5O2  3CO2 + 4H2O, how many grams of water are formed?

Chemistry
What would the step by step process be to perform titration with a strong base and strong acid? Including the equipment. If someone could explain it in a brief way to me that would be appreciated.

AP Chemistry!!!
If 5.6 g of aluminum at 65.2 °C is placed in a calorimeter that contains water at 23.5 °C and the temperature of the water after the heat exchange occurs is 24.7 °C, then identify how much water is in the calorimeter. I know this has something to do with q=mc delta T but I ...

Chemistry
A cube of solid reactant with sides of 1.00 cm² is submerged in a liquid and reacts to form a gas product at an initial rate of 20 mL/s. The solid-liquid interface is 6.0cm² of surface area. If you sliced this cube (like a block of cheese) into 10 slices, and then replaced ...

Chemistry
A gas is collected by water displacement at 25 degrees celsius.(the vapor pressure of water at that temperature is 24mmhg.if the atmospheric pressure is 800mmhg.what is pressure of the dry ice

chemistry
PLEASEEEE HELP Write the balanced equation for the reaction between zinc and acetic acid. The equation has been written you just have to balance. ___Zn + ___HC2H3O2 → ___Zn(CH3COO)2 + ___H2

Chemistry
What is the likely identity of a substance (see Table 10-1) if a sample has a mass of 16.0 g when measured in air and an apparent mass of 15.2 g when submerged in water? Which of the following is it? -copper -gold -lead -aluminum -iron or steal -concrete (Note: Can only select...

chemistry
density of sand =3.00g/cm3?

Chemistry
what happens when magnesium reacts with iodine to make magnesium iodide. Manymanymany thankyou's all round!!!!

Chemistry
what are atoms of nitrogen with different numbers of neutrons called?

Chemistry
what is the acid that is used to make ammonium nitrate???

chemistry
what are atoms of nitrAogen with different numbers of neutrons called?

Chemistry
A plasma reaction converts A (Molecular weight = 200) to B and uses NAD as a co-substrate and produces NADH as a by product (1 mole of NADH is produced per every 1 mole of A converted to B). The amount of NADH can be determined by monitoring its’ absorbance at 340nm in a ...

Chemistry
How much Zn is mixed with 2HCl = ZnCl + H2 ?

Chemistry
What group of elements were not on the original periodic table

AP Chemistry!!!
Explain the reaction that would occur in a galvanic cell between solutions of Al3+ and Pb2+. Identify the oxidation and reduction reactions and the location of each reaction. Then, use the standard reduction potential tables to determine the cell potential.

Chemistry
Show calculations (labeled with units) needed to prepare 25 mL of 0.20 M Pb(NO3)2 and 25 mL of 0.20 M NaI.

Chemistry (PLZ HELP)
Aluminium can be produced by the thermal decomposition of aluminium oxide. What mass of aluminium would be produced from 3.5kg of aluminium oxide?

Chemistry
Determine the volume of a 0.1 M solution of HCl, necessary to titrate 20 mL of a 0.5 M solution of NH3. The value of Kb is 1.8 x 10-5.

Chemistry
Determine the variation of the buffer of the problem 1, if 200 mL of the buffer is added 10 mL of a 1.0 M solution of HCl.

Chemistry
Calculate the pH of a buffer made of a 0.4 M of acetic acid and 0.5M of sodium acetate. The Ka for the acetic acid is 1.8 x 10-5.

chemistry
1. Silicon dioxide reacts with carbon upon heating to produce silicon carbide (SiC) and carbon monoxide. SiO2(s) + 3C(s) = SiC(s) + 2CO(g) a. What mass of carbon is required to react completely with 15.70 g of SiO2? b. When 152 g of SiO2 reacts with excess carbon, what mass of...

chemistry
A hydrochloric acid So of concentration 1mol/l and a solution S1 of concentration C1= 2×10^-2 mol/l to be prepared from So. The available materials are given below: ● Volumetric pipet: 5ml, 10ml, 20ml ● Beakers: 100ml, 250ml, 500ml ● volumetric flask : 100ml, 500ml ● ...

physics biology chemistry and ict
WHAT ARE THE ALLOTROPES OF ANTIMONY

Chemistry (just need someone to check my answer)
When iron metal reacts with oxygen, the reaction can form Fe2O3. Write a balanced chemical equation for this reaction, and find the number of moles of oxygen that are needed to form 6 mol of Fe2O3. My answer: 9 moles of oxygen

chemistry
The first order rate constant for the decomposition of N2O2 of 0Cis 5.2*10/6 per minute. If the activation energy is 6200J/mol, calculate the rate constant at 25C

Chemistry
Hello, I was wondering what would happen if u add KOH(potassium hydroxide) solution instead of KOH solid to HCL (hydrochloric acid). Currently, learning enthalpy in class and I'm not sure how this affects enthalpy

AP Chemistry
Tungsten(VI) oxide can be reduced to tungsten by heating it with carbo, as shown in the reaction: 2WO3(s) + 3C(s) <---> 2W(s) + 3CO2(g) If the original mass of WO3 is 37.0 g, how many grams of CO2 must be collected from the reaction in order to infer that the solid that ...

Chemistry
What is the total ionic and net ionic equation for this aqueous reaction?: Sr(OH)2(aq) + HClO2 (aq) -I wrote the molecular as: Sr(OH)2 (aq) + HClO2 (aq) ---> SrClO2 (aq) + H20 (l) -Is the Total Ionic: Sr2+ (aq) + 2OH- (aq) + H+ (aq) + 2ClO- (aq) ---> Sr2+ (aq) + 2ClO-(aq...

Chemistry
How many aluminum atoms are there in 15.0mg of Al2O3?

chemistry
What is the ∆G for the following reaction under standard conditions (T = 298 K) for the formation of NH4NO3(s)?

Chemistry
Find the Percentage Composition of 0.68g of CaCO3 in 1.3g of antacid tablet. I think it is 680/1300*=approx. 52%

Chemistry
What is the total number of mole of atoms in 1 mole of Al2(CO3)3?

Chemistry
What is the concentration of Pb in mg/L , if you have 25 mg Pb in 5kg of seawater? (note: density of seawater is 1.025 kg/L)

Chemistry
Using the fact that fresh water has a density of 1000 kg/m3 , show that 5ppm Pb = 5 mg/L Pb .

Organic Chemistry
Hello! I was looking for some advice on my organic chemistry lab. We were supposed to separate and identify a solid mixed into a liquid. I found and have confirmed my liquid is acetone by distilling it out of the solid. The solid then turned into a whitish powder while in the ...

Chemistry
rank the compounds below in order of increasing vapor pressure at 298 K? A) c3h6 B) c4h8 C) c5h10

Chemistry
If an astronaut weights 804n on earth what would he weight on a planet that has 3 times the mass and twice the radius of earth

Chemistry (percent abundance) *emergency*
If the average atomic mass of Br is 79.90 amu, what is the percent abundance of each of its isotopes? How would we figure out the isotopes first before we calculate the percent abundance??

Chemistry
4Fe + 3O2 = 2Fe2O3 158g of Fe will react with how many litres of O2 to produce the maximum amount of Fe2O3

Chemistry
A 50.0 mL aqueous solution of sodium hydroxide has a pH of 12.50. If 36.00 ml of 0.0200 mol/L sulfuric acid is added to this sodium hydroxide solution, what will be the new pH of the resulting solution? Assume that the temperature stays constant at 25 C, and that the volumes ...

Chemistry
If 8.87 g of CuNO3 is dissolved in water to make a 0.500 M solution, what is the volume of the solution?

Chemistry
Why do carbonated beverages go "flat" when opened and left and room temperature and pressure?

Chemistry (PLZ HELP)
State why you think clothes might be important to clean in hot water. Is it because it has to do with solubility or something?

chemistry
Hydrochloric acid solution reacts with zinc according to the following equation: 2H3O + Zn -> Zn^2+ + H2 +2H2O 100ml of hydrochloric acid solution Ca=0.5mol/l must be prepared from C=5mol/l hydrochloric solution. 1) Specify the glassware needed for this preparation . At ...

Chemistry
Draw the Lewis Structure of CH3NCS including all resonance forms. Assign formal charges. Do not include resonance arrows.

chemistry
What volume of 0.900 M HCl is required to complete neutralize 50.0 ml of a 0.500 M Ba(OH)2 solution?

Chemistry
This same substance is a gas with a density of 1.25 g/L at 127o C and a pressure of 400 torr. What is its molar mass ?

Chemistry
Ammonium nitrate is an oxidizing agent and can give rise to explosive mixtures of mixture of two moles of powdered aluminum and 3 moles of ammonium nitrate crystals react exothermically yielding nitrogen gas water vapor and aluminum oxide how many grams of the mixture are ...

chemistry
what is the procedure for the preparation of 10 gram of lead iodide

Chemistry
A scintillation counter detects radioactivity by: A) none of the answers. B) emission of light from a NaI crystal when radioactivity passes through the crystal. C) ionization of argon gas in a chamber which produces an electrical signal. D) analyzing the mass and velocity of ...

Chemistry
For the reaction Ag2S(s) ⇌ 2 Ag+ (aq) + S2- (aq), what happens to the equilibrium position if ammonium sulfate is added? A) doubles B) shifts to the left C) does nothing D) shifts to the right E) halves

chemistry
how many grams of sodium hydroxide is required to neutralize 73grams of hydrochloric acid and to form sodium chloride and water

chemistry
The edge of a body-centered-cubic unit cell ( which contains two atoms per unit cell) of an element Y was found to be 2.16x10^-8cm. The density of the metal is 19.35g*cm^-3. What is the approximate molar mass of Y?

Chemistry
I just need someone to check my answers please :) On the pH scale are the following items base, neutral, or acid? 1. Hand Soap 2. Blood 3. Milk 4. Coffee 5. Orange Juice 6. Soda Pop 7. Vomit 8. Battery Acid My answers: 1. Base 2. Neutral 3. Neutral 4. Neutral 5. Base 6. Acid 7...

Chemistry
a+b<->c (fast) c+d->e (slow) e->f+b (fast) How do you determine the overall equation for these reaction mechanisms?

Chemistry
Write a chemical equation for 48g of gasoeous hydrogen and 320g of gaseous oxygen yield

chemistry
Industrial waste contains Zn(II) and cyanide. The waste is toxic to aquatic species like fish. 1- If the waste consists of water, Zn(II) and cyanide, what ligands might complex with Zn(II)? 2- Write chemical equilibria reactions the must be considered to determine toxicity of ...

Chemistry
Identify the equation for which Keq = [Cu+]2[S2-]. A) CuS(s) ⇌ Cu2+(aq) + S2- (aq) B) 1/2Cu2S(s) ⇌ Cu+(aq) + 1/2 S2- (aq) C) Cu2S(s) ⇌ 2Cu+(aq) + S2- (aq) D) Cu2S(s) ⇌ Cu+(aq) + 2 S2- (aq) E) none of the answers

Chemistry
Which of the following is TRUE for a system that is in dynamic equilibrium? A) The forward reaction goes to 100% completion. B) The concentration of products is equal to the concentration of the reactants. C) The reaction rate of the forward reaction approaches zero. D) Both ...

Chemistry
for any solute what important condition must be stated in order to report the solubility answer

Chemistry
Calculate partial pressure given ka1, pH and KH The equation given in the question was: HCO3-(aq)+H3O+(aq)= CO2(aq)+H2O Calculate the partial pressure of CO2. I think you use : [H3O+] = ka1x(antilog pH)/(antilog pH) Then Henrys law: Equilibrium conc.[G]=Kh(law constant) × pg...

Chemistry
Hi , I have this question and I do not know what steps to follow. Please help guide me. It will be really appreciated. Calculate the extent of oxidation in a stream where water it's in equilibrium with atmospheric oxygen and had a pH pic 6.5 (a(H3O+) =antilog (-6.5) ). The ...

CHEMISTRY
what volume of hydrogen is produced with excess HCL according to the equation Zn+2HCL-ZnCL2+H2

chemistry
The edge of a body-centered -cubic unit cell (which contains two atoms per unit cell) of an element Y was found to be 3.16x10^-8cm.The density of the metalis 19.35g*cm^-3. What is the approximate molar mass of Y?

Chemistry
Consider two equally sized balloons at room temperature, one filled with oxygen gas and one filled with an unknown gas. If the balloon filled with oxygen gas deflates in 37 hours and the other balloon deflates in 26 hours, which of the following is the most likely identity of ...

Chemistry
If 2.00 g of element G reacts with 5.00 g of element M to produce 7.00 g of a compound with the formula G3M2, what is the atomic mass of G if the atomic mass of M is 135.0 amu? Answer is 36 amu but why

Chemistry
I am using 85% ACS grade phosphoric acid. I need to make a 21% phosphoric acid solution with a total volume of 250ml. I have been told that 37ml of the 85% ACS grade phosphoric acid plus 188ml of Deionized water will create the 21% phosphoric acid solution I need to make. I'm ...

chemistry
Explain how sodium carbonate can be used to soften hard water

Chemistry
Phosphate can act as buffer: H2PO4- HPO4^2- + H+ The pKa of this equilibrium is 7.21. What is the ratio of H2PO4- to HPO4^2- at pH 7.0? A. 1.62 B. 0.62 C. 50.47 D. 0.019 E. 0.21

chemistry
Please help: How do you prepare 2 L of formate buffer pH=3.14 (c=0.05mol/l) (pk=3.74). THEY WANT THE VOLUMES THANKS

chemistry
A serving of cereal contains 90mg potassium. If there are 22 servings in a box how many moles of Potassium are present in the cereal in the box

chemistry
How many moles of sugar are contained in a 10lb bag of sugar if the sugar has the formula C12H22O11

Chemistry
A is a solution of tetraoxosulphate(iv)acid.B contains 3.95g of sodium trioxocarbonate(iv) in 750cm3 of solution.if 22.70cm3 of the tetraoxosulphate(iv)acid neutralized 25.0cm3 of sodiumtrioxocarbonate(iv).calculate the concentration of i) B in moldm-3 ii) A in moldm-3

chemistry
how many moles are released when 13.2 g of ammonium sulfate 2NH4SO4 is dissolved in water ? I know 13.2 g 2NH4SO4 = .099 moles

chemistry ksp
i feel like none of these answers are right. if the solubility of the solid is 'S' mol/ L, what is the Ksp of the product of the salt? Ca3PO42-(s) --> 3Ca2+(aq) + 2PO42- (aq) A)ksp=S^2 B)ksp=4S^3 C)ksp=27S^4 D)ksp=108S^5 Only leaning towards D because its the only one that ...

chemistry
how do you calculate the equilibrium constant K for a reaction given only the equilibruim pressure for the sample...i thought u needed partial pressures for all substances involved. They just tell me the eq pressure is 3 atm for the sample and ask for Keq. Here's the rxn... ...

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