Monday
February 27, 2017

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
Hello, Is there a reaction when NaNO3 is added to some H2O? Or does it just dissolves? Please explain why, thanks!
Monday, January 2, 2017 by Sherlique

Chemistry
If I add water to NaNO3 does it make HNO3 and NaOH? For example NaNO3 + H2O -> HNO3 + NaOH is that equation correct? Please explain if it's not. Thanks!
Monday, January 2, 2017 by Sherlique

chemistry
Hello, Is nano3 + h2o -> naoh + hno3 correct?
Sunday, January 1, 2017 by Sherlique

chemistry
Name two metals which are obtained by reducing thier oxides by heating with aluminium How is the metal oxides present in calcined/roasted ore reduced to the metal
Sunday, January 1, 2017 by Anonymous

chemistry
Name two metals which are obtained by reducing thier oxides by heating with aluminium How is the metal oxides present in calcined/roasted ore reduced to the metal
Sunday, January 1, 2017 by Anonymous

Chemistry
Is this a valid equation? NaNO3 + H2O = NaOH + HNO3 Why or why not?
Sunday, January 1, 2017 by Sherlique

chemistry AS
how do you draw the skeletal structure for (z)-pent-2-ene.
Saturday, December 31, 2016 by hifza

Chemistry
Hello, If I add water to a solid, how do i represent it in a equation with phases? for example the NaNO3 was the solid in this case and H2O was the liquid, does NaNO3 turns into an aqueous or stays as solid when I write the equation? Which one would be correct? 1) NaNO3(s) + ...
Saturday, December 31, 2016 by Sherlique

Chemistry
Using equation only. Show how tetraoxosulphate(IV) can be prepared industrially
Saturday, December 31, 2016 by UMEADI

Chemistry
Hello, Which one is correct? 1) NaOH(aq) + HNO3(aq) ⇋ NaNO3(aq) + H2O(l) or 2) NaNO3(s) + H2O(l) ⇋ NaOH(aq) + HNO3(aq) Thanks!!
Saturday, December 31, 2016 by Sherlique

Chemistry
Iron+CON Hydrochloric acid =?
Saturday, December 31, 2016 by Anonymous

Chemistry
Hello, Sorry to bother you all, but i have a quick question. If I needed to use heat in a reaction, for example, Ca(OH)2(s) + 2NH4Cl(s) = 2H2O(g) + 2NH3(g) + CaCl2(s) Do I need to put "+heat" on the reactant side when writing my equation? Thanks in advance! :)
Saturday, December 31, 2016 by Sherlique

chemistry
a sample of gaseous substance at 25 degrees Celsius and 0.862atm has a density of 2.6g/l. what is the molecular weight of the substance?
Friday, December 30, 2016 by Goodness

chemistry
if 3.15g of mercury are thermally decomposed to mercury and oxygen what mass of mercury will be produced and how many oxygen molecules will be produced [hg=208,o=16]
Friday, December 30, 2016 by jj

Chemistry
Hello, 1) What is the PH if ammonia is mixed with water vapour? 2) What is the white smoke when I heat NH4Cl with Ca(OH)2? Thanks
Thursday, December 29, 2016 by Sherlique

Chemistry
Hello, What are the phases for this equation? NaNO3 + H2O ⇋ NaOH + HNO3 Oh and can I write the equation this way as well? NaOH + HNO3 ⇋ NaNO3 + H2O Do they mean the same thing?
Thursday, December 29, 2016 by Sherlique

Chemistry
One mole of an ideal gas is allowed to expand isothermally at -29. 3degrees celcious from a volume of 4. 0L and apressure of 5. 0atm to avolume of 10. 0L and apressure of 2. 0atm. i. Draw a p-v diagram for the process. ii. Determine the work done by the fasduring expansion.
Thursday, December 29, 2016 by Patrick

Chemistry
Hi, what is the PH for NH3 in gas form? When I tested it with PH paper it showed a number around 8-9.5, but from searching online its a higher number. I'm not sure which one is correct. Thanks
Thursday, December 29, 2016 by Sherlique

chemistry
Hi, I was wondering why is there white smoke when nh4cl and ca(oh)2 is being heated. Thanks!
Thursday, December 29, 2016 by Sherlique

Chemistry
1. A student collected the following data for a fixed volume of gas: Temperature (⁰C) Pressure (mm of Hg) 10 726 20 750 40 800 70 880 100 960 150 ??? Fill in the missing data point. Show all calculations leading to an answer.
Wednesday, December 28, 2016 by sophia

Chemistry
Which of the following is true about oxidation reactions? A. Oxidation reactions are the principal source of energy on Earth. B. All oxidation reactions are accompanied by reduction reactions. C. The burning of wood in a fireplace and the metabolization of food by your body ...
Wednesday, December 28, 2016 by sophia

SAT Math
All of the students who took chemistry at Groveton High School last year were juniors or seniors, as shown in the table below. If 80% of the students who took chemistry passed, then what fraction of the students in the combined junior and senior classes took chemistry? Class ...
Tuesday, December 27, 2016 by Kay

Chemistry AP
How many mL of0.4M AgNO3 solution must be added to 200mL of0.4 M NaI in order to for 11.7 grams of AgI precipitate?
Tuesday, December 27, 2016 by Angel

chemistry
Calculate the vapour density of a triatomic gasX if it's relative atomic mass is 16
Tuesday, December 27, 2016 by favour

chemistry
how many g/ml are there in 1M?
Tuesday, December 27, 2016 by homework

Chemistry
What mass of zinc metal would be needed to produce 0.5 litre of hydrogen gas from dilute HCl
Tuesday, December 27, 2016 by Alex

chemistry
The label of a bottle containing a solution So of hydrochloric acid carries the following indications :hydrochloric acid of density 1190g/l percentage by mass 37%. We introduce a volume V=4.2ml of So in a volumetric flask of volume 500ml containing about 100ml of distilled ...
Tuesday, December 27, 2016 by vicky

chemistry
One has a solution Sa of ethanoic acid of concentration Ca=1×10^-2 mol/l and pH=3.4  One mixes a volume Va=60ml of the solution Sa of ethanoic acid with a volume Vb1=20ml of the Sb1 solution of ammonia of concentration Cb1=2×10^-2 mol/l. The pH is 5 One has a soutions of ...
Tuesday, December 27, 2016 by vicky

Chemistry
An ion x3-has 16 neutrons and an electronic configuration of2.8.8 determine 1]th number of protons in an atom x 2]the atomic mass of x
Tuesday, December 27, 2016 by Edith

Chemistry
a domestic cleaner contains concentrated hydrochloric acid as the active ingredient. a titration experiment was carried out to determine the concentration of hydrochloric acid in the domestic cleanser. 20.0mL of the cleanser were diluted to 250.0mL with distilled water. 25.0mL...
Monday, December 26, 2016 by Darth Chan

Chemistry
A given volume of ozone diffused from a certain apparatus in 96seconds calculate the time taken by an equal volume of carbonoxide to diffuse under the same condition?
Monday, December 26, 2016 by Zeugen reezy

Chemistry
Discuss the expansion of an ideal gas and changes in thermodynamic properties (3 marks)
Monday, December 26, 2016 by Anonymous

Applied Science Chemistry
A 0.5g mixture of Cu and CuO was treated with hydrogen at elevated temperature. CuO was reduced to Cu. Q1.) write a balanced equation for the reaction Q2.) before the experment, calculate the minimum amount in mole of hydrogen required to ensure the reduction is completed
Monday, December 26, 2016 by Darth Chan

chemistry
One has a solution Sa of ethanoic acid of concentration Ca=1×10^-2 mol/l and pH=3.4 One mixes a volume Va=60ml of the solution Sa of ethanoic acid with a volume Vb1=20ml of the Sb1 solution of ammonia of concentration Cb1=2×10^-2 mol/l. The pH is 5 One has a soutions of weak...
Sunday, December 25, 2016 by vicky

chemistry
The label of a bottle containing a solution So of hydrochloric acid carries the following indications :hydrochloric acid of density 1190g/l percentage by mass 37%. We introduce a volume V=4.2ml of So in a volumetric flask of volume 500ml containing about 100ml of distilled ...
Sunday, December 25, 2016 by vicky

chemistry
In equation He +Br2------>2HI why chemical rate of Br2 is taken as 1/2 . It's a reversible reaction. Please explain in detail. While H2 rate is taken as 1 why?
Saturday, December 24, 2016 by sanjay

chemistry
A domestic cleanser contains concentrated HCl as the active ingredient. A titration experiment was carried out to determine the concentration of HCl in the domestic cleanser. 20.0 ml of the cleanser were diluted to 250.0 ml with distilled water. 25.0 ml of the diluted cleanser...
Saturday, December 24, 2016 by henry39

chemistry
A) A solution was prepared by dissolving 1.113 g of MgCl2 into water and made up to 50.0 ml, calculate the molar concentration of the solution. B) A 250.0 ml of 0.50 M solution of Na3PO2 solution was prepared by diluting 2.5 M of stock solution. Calculate the volume of stock ...
Saturday, December 24, 2016 by henry39

Chemistry
How many litres nitric acid 70% w/w and how many litres of water do I need to prepare a 47 v% nitric acid solution. Please help.
Saturday, December 24, 2016 by Clare

Chemistry
Hi, How do you know how many ligands a metal ion needs to form a complex ion? So for example, with (Fe(H20)6)2+, how am I supposed to know that the Fe needs 6 H20's, rather than 4? Thank you!
Thursday, December 22, 2016 by Maria

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...
Thursday, December 22, 2016 by Pam

chemistry
A 0.50 g mixture of Cu and CuO was treated with hydrogen at elevated temperature. CuO was reduced to Cu . (b) Before the experiment, calculate the minimum amount (in mole) of hydrogen required to ensure the reduction is completed. (3 marks) (c) After passing with in excess ...
Thursday, December 22, 2016 by henry39

Science Chemistry
Phosphorous (P) is an indispensable nutrient in food production. According to the estimates, mineral phosphorous resources will end up within 50 years and consequently new sources of P has to be found. A human excretes 2,2 g of phosphorous (P) per day on average. In ...
Thursday, December 22, 2016 by karem

Science Chemistry
according to the reaction below: 4 NO + 3 O2 + 2 H2O → 4 HNO3 a) 0,001 g of NO dissolves into 1 liter of rainwater and all of it transforms into nitric acid. What is the molar concentration of nitric acid in the rainwater? b) Supposing that no other acids are dissolved in ...
Thursday, December 22, 2016 by karem

Science Chemistry
The elementary analysis of 22 g hydrocarbon sample results in 18 g C and 4 g H. a) Choose the correct chemical formula of the hydrocarbon: i) CH4 ii) C2H4 iii) C3H8 b) What is the amount of CO2 in grams formed by the total combustion of hydrocarbon? Assume complete combustion...
Thursday, December 22, 2016 by karem

chemistry
How many grams of aluminum is produced from the decomposition of 34grams of aluminum oxide
Wednesday, December 21, 2016 by Anonymous

Chemistry
If I heated NaNO3, would there be yellow gas inside the test tube?
Wednesday, December 21, 2016 by Sherlique

chemistry
Hi I was wondering if this equation is reversible and be written lime this: NaNO3 + H2O ⇋ NaOH + HNO3 Thanks!
Wednesday, December 21, 2016 by Sherlique

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.
Wednesday, December 21, 2016 by kery

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...
Wednesday, December 21, 2016 by Pam

chemistry
Determine the [OH^-] of a solution that is 0.145 M in CO3^2-.
Wednesday, December 21, 2016 by nurul

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?
Tuesday, December 20, 2016 by Grace

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'...
Tuesday, December 20, 2016 by Madilyne

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 >-<
Tuesday, December 20, 2016 by Madalyn

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 ...
Tuesday, December 20, 2016 by Sherlique

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
Tuesday, December 20, 2016 by Anurima khuranw

Chemistry
how many sulfate ions are in 30 formula units of aluminum sulfate?
Monday, December 19, 2016 by Anonymous

Chemistry
Calculate the work done when 36.0 g of tin dissolves in excess acid at 1.00 atm and 30.1 C.
Monday, December 19, 2016 by Ennaliea

Chemistry
what compound is the result of silver nitrate and potassium bromide
Monday, December 19, 2016 by Alice Keign

Chemistry
What are the products of the neutralization reaction between hydrochloric acid and magnesium hydroxide? a. MgCl and H2O b. MgCl2 and H2O**
Monday, December 19, 2016 by Amberxzx

maths, geography, physics, chemistry
A cuboid has TSA 40 sq. m and latral surface 26 sq. m. Find the base area.
Monday, December 19, 2016 by sneha kaurav

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?
Monday, December 19, 2016 by Alice Keign

chemistry
m(ZnO) - ? m (HCl) - ? w(HCl) = 5% m(ZnCl) = 13,64 gram
Monday, December 19, 2016 by yasine

chemistry
CH3-C(triple bond)C-CH-(C2H5)CH3product a and product b
Monday, December 19, 2016 by chemistry

chemistry
CH3-C(triple bond)C-CH-C2H5-CH3product a and product b
Monday, December 19, 2016 by chemistry

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?
Monday, December 19, 2016 by charles

chemistry
determine d no of moles in d following samples 2.5*10
Monday, December 19, 2016 by promise

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 ...
Sunday, December 18, 2016 by Jen

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?
Sunday, December 18, 2016 by vera

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.
Sunday, December 18, 2016 by Gr 11

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 ...
Thursday, December 15, 2016 by Callie

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 ...
Thursday, December 15, 2016 by Anonymous

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
Thursday, December 15, 2016 by Carol

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
Thursday, December 15, 2016 by Bre

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...
Thursday, December 15, 2016 by Dominick

chemistry
density of sand =3.00g/cm3?
Wednesday, December 14, 2016 by Anonymous

Chemistry
what happens when magnesium reacts with iodine to make magnesium iodide. Manymanymany thankyou's all round!!!!
Wednesday, December 14, 2016 by moi encore une fois!

Chemistry
what are atoms of nitrogen with different numbers of neutrons called?
Wednesday, December 14, 2016 by plz hlp asap!

Chemistry
what is the acid that is used to make ammonium nitrate???
Wednesday, December 14, 2016 by shannone

chemistry
what are atoms of nitrAogen with different numbers of neutrons called?
Wednesday, December 14, 2016 by Grande

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 ...
Wednesday, December 14, 2016 by Sophia

Chemistry
How much Zn is mixed with 2HCl = ZnCl + H2 ?
Tuesday, December 13, 2016 by Joe

Chemistry
What group of elements were not on the original periodic table
Tuesday, December 13, 2016 by Anonymous

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.
Tuesday, December 13, 2016 by Callie

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.
Tuesday, December 13, 2016 by Jeb

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?
Tuesday, December 13, 2016 by Anonymous

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.
Tuesday, December 13, 2016 by Melanie

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.
Tuesday, December 13, 2016 by Melanie

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.
Tuesday, December 13, 2016 by Melanie

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...
Tuesday, December 13, 2016 by Luke

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 ● ...
Tuesday, December 13, 2016 by angy

physics biology chemistry and ict
WHAT ARE THE ALLOTROPES OF ANTIMONY
Tuesday, December 13, 2016 by SEINI OUSMAN

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
Tuesday, December 13, 2016 by Zoella

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
Tuesday, December 13, 2016 by hadiza

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
Monday, December 12, 2016 by Ann

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 ...
Monday, December 12, 2016 by Landon

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...
Monday, December 12, 2016 by Les

Chemistry
How many aluminum atoms are there in 15.0mg of Al2O3?
Monday, December 12, 2016 by Les

chemistry
What is the ∆G for the following reaction under standard conditions (T = 298 K) for the formation of NH4NO3(s)?
Monday, December 12, 2016 by abraham

Chemistry
Find the Percentage Composition of 0.68g of CaCO3 in 1.3g of antacid tablet. I think it is 680/1300*=approx. 52%
Monday, December 12, 2016 by Akshay

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Homework Help: Science