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Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
what is the precipitate form of 2naoh+cuso4->na2so4+cu(oh)2

Chemistry
A CaCl2 solution is given to increase blood levels of calcium. If a patient receives 5.0 mL of a 5.0 % (m/v) CaCl2 solution, how many grams of CaCl2 were given?

Chemistry
A typical antacid contains CaCO3. If such an antacid is added to 25.0 mL of a solution that is 0.250 M in HCl, how many grams of CO2 gas are produced?

Chemistry
A patient received 5.0 g of NaCl in 8 hours. How many milliliters of a 0.40 % (m/v) NaCl (saline) solution were delivered?

chemistry
what will be formed when oxygen combines with hydrogen in the presence of hydrated iron 3 oxide?

chemistry
Calculate the grams or milliliters of solute needed to prepare the following solutions. 1.)75. g of a 7.0 % (m/m) KCl solution 2.) 1250 mL of a 8.0 % (m/v) NH4Cl solution 3.) 270. mL of a 15.0 % (v/v) acetic acid solution I really just need to know how to work the first ...

chemistry
Solubility (g/100gH2O) Substance 20∘C 50∘C KCl 34.0 42.6 NaNO3 88.0 114.0 C12H22O11 (sugar) 203.9 260.4 Using the above table, determine whether each of the following solutions will be saturated or unsaturated at 50 ∘C. 1.) Adding 19.7 g KCl to 35.0 g H2O 2.)...

chemistry
a 51.6 litre sample of a pure allotrope of oxygen has a mass of 100.0 grams. (25 degrees celsius and 100 kPa) Show, by calculation, which allotrope of oxygen is present.

Chemistry
Write a balanced equation for the complete oxidation reaction that occurs when ethanol (C2H5OH) burns in air.

Chemistry
0.110 M in formic acid and 5.5×10−2 M in hypochlorous acid . How to find pH

Chemistry
Marcela dissolves 80.0 g of ammonium nitrate in 50.0 mL of water at room temperature and notes that the temperature of the solution decreases by 5.0°C. Which correctly designates the signs of changes of G, S and H for this reaction?

chemistry
Which is the more stable electron: that in a ground-state H atom or that in a ground-state He+ ion? Explain your choice.

chemistry
what is activation energy?

Chemistry HELP!!!
Which of the following contains the greatest number of particles? A) 4g of helium gas B) 4g of oxygen gas C) 4g of hydrogen gas D) 4g of water Why is the answer C? Pls explain to me clearly, thks!

chemistry
a given sample of MgCl2 solution has 6×10^23 ions. what is the number of Cl(-1) ions in the same solution?

Chemistry
A small section of a polymer chain, containing 10 repeating units, has a relative molecular mass of 625. Which of the following monomers could have polymerised to form this chain? ethylene viyl chloride styrene glucose

Chemistry
Hi, I've been working for nearly 2 hrs on this problem, but I'm stuck on the next step. Thanks for any pointers in the right direction. My problem is: How many grams of S8 are needed to produce 225 grams of sulfur hexafluoride? I was given this formula: S8+24F2(Arrow)8SF6

Chemistry
How many grams of S8 are needed to produce 225 grams of sulfur hexafluoride? I know to begin with a balanced equation S8+24F2(arrow)8SF6. I've spent a couple of hours trying to figure out the next step, but I'm stuck. Thanks for any pointers!

chemistry
What volume of 0.10 M NaOH can be prepared from 250. mL of 0.30 M NaOH? A) 0.075 L B) 0.25 L C) 0.75 L D) 0.083 L E) 750 L

Chemistry
What volume of nitric dioxied at s.t.p from the below equestion N2+O2=2NO

Chemistry (DUE TONIGHT)
A possible reaction for converting methanol to ethanol is: CO(g) + 2H2(g) + CH3OH(g) -----> C2H5OH(g) + H2O(g) I completed parts A-C correctly, and found the following info: delta H = -165.6 kJ delta S = -227.4 J/K delta G = -97.9 kJ The next question is asking to estimate ...

chemistry practical
Why? alkaline solution didn't puppet out.

chemistry
Calculate the no. Of moles of co2 is liberated gives50gm of caco3 reacts with 7.3gm of dil.hcl

chemistry
Discuss the structure of bonding in copper acetate?????

college chemistry
prepare 0.2M phospate buffer of pH 5.7

Chemistry
N2H4 + 2H2O2= N2 + 4H2O What are the mole ratios of hydrazine (N2H4) to hydrogen peroxide (H2O2) and hydrazine to water

Chemistry
In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction?

Chemistry
1.06g of Na2CO3 is dissolved in water to make 250cm^3 solution. 10.0 cm^3 of this solution was further diluted to make 500cm^3 of 2nd solution. 25.0cm^3 of 2nd solution reacted with 28.5cm^3 of HCl. Find the concentration of HCl in mol/dm^3

Chemistry
Why water can be used as a solvent in paper chromatography?

Chemistry
Why do different substances have different Rf values ? used in chromatography.

pharmaceutical physical chemistry
find the density of NH3 gas at 100celsius when confined by a pressure of 1600mmHg

Chemistry
The reaction 2NO (g) + 2H2 -> N2 (g) + 2H2O (g) was found to follow the rate law, rate = k[NO]^2[H2]. By what factor will the rate of reaction increase when the pressure of NO gas is increased from 2.0 atm to 3.0 atm? Assume all other conditions are held constant. I'm ...

chemistry
How much heat is produced by the complete combustion of 287 g of CH4? CH4(g)+2O2(g)→CO2(g)+2H2O(g)Δ​H∘rxn=−802.3kJ

Chemistry
How many molecules are in 5.2L of carbon dioxide gas?

Chemistry
What is the test for ammonium formed on hubber process? i need your help

Chemistry
hydrogen sulfide reacts with sulphur dioxide to give water and S, balance the equation. if hydrogen sulfide contains 125g, how much S is produced?

Chemistry
hydrogen sulfide reacts with sulphur dioxide to give water and S, balance the equation. if hydrogen sulfide contains 125g, how much S is produced?

Chemistry
If you are asked to make exactly 1.0 Liter of 0.80 M ZnCl2 solution, how many grams of zinc chloride would you need to be massed out? How do I go about solving this problem?

Chemistry
All the following are necessary parts of a neutralization reaction except A) an acid B) an indicator C) water D) a salt.

Chemistry
4.80 dm^3 of chlorine gas was reacted with NaOH solution. a) how many moles of Cl2 reacted b) what mass of NaOCl was formed? c) if the concentration of the NaOH was 2.00 mol/dm^3. What volume of sodium hydroxide solution was required? d) write an ionic equation for this reaction

Chemistry
Theoretically how many grams of malachite should be formed when 1.5 moles of Copper Sulphate reacts with an excess of sodium carbonate?

12th grade chemistry
It is required to titrate ethanol solution .Being available a 0.2mol/l potassium dichromate solution and 4mol/l sulfuric acid solution on the presence of a convenient indicator. a)indicate the glassware used for titration. b)give a brief description of the procedure followed ....

chemistry
Two compounds of molecular formula respectively C2H4O and C4H8O produce a yellow orange precipitate by the reaction DNPH. a)is this indication sufficient to write the structural formulas of these two compounds? Explain. b)what identification tests should further be done to ...

chemistry
How many grams of Mg(OH)2 would be produced from 4 mol KOH? if the balanced reaction is MgCl2 +2KOH arrow Mg(OH)2 + 2KCl?

Chemistry
Equation of Mg(OH)2 (aq) + KOH (aq) gives you what ?

Chemistry
A student dilutes a solution so that its pH changes from 2.4 to 4.4. 10mL of the original solution was diluted by how many mL?

Chemistry
14 grams of coal undergoes complete combustion in 58 grams of oxygen gas. What volume of gas (measured at 25 degrees celsius and 100 kPa) is present when the reaction is complete?

Chemistry
I may need this broken down step by step to understand this problem thanks. A 20.0% by mass solution of phosphoric acid (H3PO4) in water has a density of 1.114 g/ml at 20℃. What is the molarity of the solution?

Chemistry
If a current of 3.00 A is applied to a cell containing a 400g copper anode, determine the final mass of the copper anode after the cell runs for 48.0h

Chemistry
If a solid state lithium battery produced 5.00 mA in 8.25 h, then the mass, in milligrams, of lithium consumed would be?

chemistry
QUESTION 11 Ammonia gas is formed from nitrogen gas and hydrogen gas, according to the following equation: N2 (g) + 3H2 (g) Imported Asset 2NH3 (g). If 84.0 g of nitrogen gas is allowed to react with an excess of hydrogen gas to produce 85.0 g of ammonia, what is the percent ...

chemistry
QUESTION 10 Ammonia gas is formed from nitrogen gas and hydrogen gas according to the following equation: N2 (g) + 3H2 (g) Imported Asset 2NH3 (g). If 112 grams of nitrogen gas is allowed to react with an excess of hydrogen gas to produce 120 grams of ammonia, what is the ...

chemistry
QUESTION 9 The number of moles of the reagent in excess can be used to calculate the moles of the products of the reaction. TRUE FALSE

chemistry
When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium chloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) Imported Asset MgCl2 (aq) + H2 (g), if 72.9 g of Mg and 146.0 g of HCl are allowed to ...

chemistry
When 4.2g of NaHCO3 is added to a solution of CH3COOH Weighing 10g, it is observed that 2.2g of co2 is realised into the atmosphere . The residue left is found to be 12g . Show that this observations are in agreement with the law of conservation of mass?

chemistry
20g of NaHCO3 Treated with 22g of HCl Producing 12g of the residue. What is the amount of co2 Formed ?

chemistry
When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium chloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) Imported Asset MgCl2 (aq) + H2 (g), if 72.9 g of Mg and 146.0 g of HCl are allowed to ...

chemistry
If chlorine and fluorine react according to the reaction (to balance): Cl2+ F2→ ClF3 And calculate the amount of product and of limiting reagent that remains, when 10 g of chlorine and 30 g of fluorine are reacted to give chlorine trifluoride.

chemistry
For combustion of 10 grams of C4H10 excess of O2, You are obtained 25 grams of CO2 according to the reaction (to balance): C4H10+ O2→ CO2+ H2O Calculate the reaction yield of the reaction. please,could anyone help me to solve this problem.

chemistry
In the gaseous phase PCl5 dissociates according to the following equilibrium: PCl5⇌PCl3+Cl2 and Kc=0.8 at 613K .Determine the equilibrium composition when 0.12 moles/L of the three compounds are mixed at 613K.

chemistry
100 mL of 0.05 M NH3 solution are added to 60 mL of a 0.1 M solution of the same compound.Determine the concentration of the final solution.

Chemistry
A 1.00 g sample of limestone is allowed to react with 100 cm^3 of 0.200 mol/dm^3 HCl. The excess acid required 24.8 cm^3 of 0.100 mol/dm^3 NaOH solution. Calculate the percentage of calcium carbonate in the limestone

Chemistry
Given the following three electron configurations: 1s2 2s2 2p5 How many core electrons does this element have? A. 4 B. 5 C. 9 D. 2

Chemistry
Which of the following atoms would have the highest first ionization energy? A. Li B. Be C. Na D. Mg

CHEMISTRY
A solution of a metal carbonate M2CO3, was prepared by dissolving 7.46 g of the anhydrous solid in water to give 1000cm^3 of solution. 25.0cm^3 of this solution reacted with 27.0cm^3 of 0.100 mol/dm^3 hydrochloric acid. Calculate the relative formula mass of M2CO3 and hence ...

CHEMISTRY
A 1.575 g sample of ethanedioic acid crystals, H2C2O4. xH20 was dissolved in water and made up to 250cm^3 . One mole of the acid reacts with two moles of NaOH. In a titration, 25.0 cm^3 of this solution of acid reacted with exactly 15.6 cm^3 of 0.160 mol/ dm^3 NaOH. Calculate ...

chemistry
the standard enthalpy of formation, for HCOOH(l)is equal to the standard enthalpy for which reaction?

Chemistry
What is theoretical yield in grams of CO2 formed from reaction of 3.12g CS2 and 1.88g O2?

Chemistry
How many mol of hydrogen present in 16g methane

Chemistry
Two closed vessels of equal volume both with pressure p1 and temperature t1 are connected to each other by tube with negligible volume. If the temperature maintained of both vessels is then changed to t1 and t2 respectively what is the pressure in the vessels?

chemistry
To 100 mL of a 0.1M NH3(Kb=1.8*10-5)solution,200mL of a 0.1M NaOH have been obtained.Calculate the pH of the solution.

science,physics,chemistry
According to our theory atomic size should increase in groups from top to bottom but in group 13 Aluminium has atomic radius 143 pm and Gallium has atomic radius 135 pm which is less WHY??????

Chemistry
What is the name for the following coordination compound or ion? Na3[Cr (NH3) NO2 Cl3]

Chemistry
In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction?

chemistry
What is the difference between the acid and base notation of a hydroxide? Give an example of the same molecular formula written in acid and base notation.

Chemistry
The specific heat capacity of copper is 0.09 cal/g°C. How much energy is needed to flow into a 10-gram sample to change its temperature from 20°C to 21°C?

chemistry
How many grams of dipotassium succinate trihydrate (K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 790.0 mL of a 0.0522 M succinic acid solution to produce a pH of 5.872? Succinic acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2). is the pH of the current solution ...

Chemistry
For the following reaction, identify the substance being oxidized and reduced CH4 + 2 O2 = CO2 + 2 H2O

chemistry
How many g of H2 is formed from 2.4 g H20 according to the following reaction. 2H2O--->2H2O+O2 I believe the answer is .27g However, I can't understand how to work the problem completely out or one like it, if someone could please explain the formula it would be appreciated.

Chemistry
For the following reaction, how many kJ of heat are produceed in forming 225.0 g of NO? 4 NH3 + 5 O2 → 4 NO + 6 H2O ΔHrxn = -906 kJ/mole

Chemistry
If the ΔH for H2O(l) → H2O(s) is -6.01 kJ, then what is the ΔH for 2H2O(s) → 2H2O(l)? A -6.01 kJ B. 6.01 kJ C. -12.02 kJ D. 12.02 kJ

Chemistry
What is the oxidized substance in the following reaction? Fe + 2HCl → FeCl2 + H2

AP Chemistry
Q - An electrochemical reaction occurs between an unknown element and zinc. The half-cell reaction for the zinc is: Zn(s) → Zn2+(aq) + 2e− The cell potential for the reaction is Eºcell = 1.83 V. Is the reaction spontaneous or nonspontaneous? Explain. What is the ...

AP Chemistry
Q - Aluminum metal reacts with zinc(II) ion in an aqueous solution by the following half-cell reactions: Al(s) → Al3+(aq) + 3e− Zn2+(aq) + 2e− → Zn(s) Predict the potential of the cell under standard conditions. Predict whether the reaction will occur ...

AP Chemistry
Sodium can be extracted by heating naturally occurring salt until it is molten. An electrochemical process is then used to extract the sodium. Cl2 is produced at the anode, and Na is collected at the cathode. Write the half-reactions that occur at the anode and the cathode. ...

Analytical Chemistry
What volume, in liters, of 1.09 M KOH solution should be added to a 0.102 L solution containing 9.35 g of glutamic acid hydrochloride (Glu, FW = 183.59 g/mol; pKa1 = 2.23, pKa2 = 4.42, pKa3 = 9.95) to get to pH 10.26? Should I start with molar concentrations in the beginning (...

Chemistry
What volume of each of the following bases will react completely with 25.00 mL of 0.200 M HCl? a) 0.100 M NaOH b)0.0500 M Sr(OH)2 c)0.250 M KOH please explain and show detail I'm so lost on this problem... thanks!

AP Chemistry
Is determining the excess reactant and limiting reactant an important part of a synthesis reaction? Is it an important part of a decomposition reaction? Explain.

AP Chemistry
Choose a chemical reaction involving two or more reactants. For this reaction, how do you determine which reactant or reactants are limiting? Explain.

AP Chemistry
Suppose you designed an experiment in which you burned a known quantity of magnesium in air. You used the product to determine how many moles of oxygen would react with the known number of moles of magnesium. Why would burning magnesium in air cause a source of error for this ...

Chemistry
What is the required volume of an acid to prepare 2 L of solution a 10% (v/v).

chemistry
0.01 mol of H2SO4 is present in its solution. Find the pH of the solution

CHEMISTRY
What mass of sulphur must be burned to produce 64.0 tonnes of sulphur dioxide. . . So far, I have calculated the molecular mass of SO2( 64.1 ) . and then found out the number of moles of sulphur dioxide. ( 998.4) What to do now?

chemistry
If potassium chlorate is 80 percent pure ,then 48gram of oxygen would produced from how many gram of potassiumchlorate

chemistry
Decomposition of nitrogen pentoxide in ccl4

Chemistry 1111
To determine the molarity of NaOH solution, student took 3.5 g of KHP (KHP – Potassium hydrogen phthalate; Molar mass = 204.22 g/mol) and dissolved in 50 mL of water and titrated with the given unknown molarity NaOH solution loaded in burette. His burette volume read 1.85 mL...

chemistry
0.02 Moles of HCl were added to a buffer solution, prepared by fluxing 20 L of gaseous NH3 and 10 L of gaseous HCl, both measured in normal conditions, in 2L of water. Calculate the pH of the solution before and after the HCl addition. (Kb NH3 = 1.8 * 10-5).

chemistry
Calculate the pH of a solution containing 10 g / L of NH4Cl (Kb NH3 = 1.8x10-5

chemistry
Decomposition of nitrogen pentoxide in ccl4

chemistry
To 100 mL of a 0.1M NH3(Kb=1.8*10-5)solution,200mL of a 0.1M NaOH have been obtained.

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