05/16/21

Mustafa learned that the net charge of an ionic compound is zero. Give the formula for the compounds that contain the following pairs of ions. 
a) K+ and I-b) Mg2+ and N3-c) Al3+ and O2-
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05/16/21

Sam wants to distinguish between mixtures and pure substances. Classify each of the following as a pure substance, a homogeneous mixture, or a heterogeneous mixture.
a) gasolineb) air c) copper metald) oil and vinegar salad dressing 
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05/16/21

Thermochemistry practice

In a coffee cup kilometer 100.0 g of H2O and 119.1 g of HCl are mixed. The HCl had an initial temperature of 44.6°C in the water is originally at 24.6°C after the reaction to temperature of both... more
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05/16/21

What is the formula for dinitrogen pentachloride?
What is the formula for dinitrogen pentachloride?
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05/16/21

A sample of sulfur dioxide occupies a volume of 652 mL at 40°C and 720 mmHg. What will the volume be at STP?
hi pls help me to solve this one
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05/16/21

hi pls help me to solve this using dalton's law of partial pressure fomulaa
1. A 1.5 L container is pressurized with 0.25 atm ofoxygen gas and 0.60 atm of nitrogen gas. Whatwill be the total pressure inside the container?2. A container holds oxygen gas, carbon dioxide,and... more
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05/16/21

hi, pls help me to solve this one using Gay-Lusasc’s Law
1. The pressure of a container of helium at 25°C is650 torr. If the sealed container is cooled down to2°C, what will the pressure be?2. A volume of the gas sample inside a containerexerts a... more
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05/16/21

When Catherine heats solid ammonium nitrite, it produces nitrogen gas and water vapor. Give the balanced equation for this reaction.
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05/16/21

Leslie learned the classes of reactions. Classify each of the following reactions in as many ways as possible.
 a) S8(s) + 8O2(g) --> 8SO2(g)b) KOH(aq) + HCl(aq) --> H2O(l) + KCl(aq)c) BaCl2(aq) + Na2SO4(aq) --> BaSO4(s) + 2NaCl(aq)
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05/16/21

When Victoria mixes aqueous solutions of 1.25 L of 0.0500 M Pb(NO3)2 and 2.00 L of 0.0250 M Na2SO4, PbSO4 precipitates.  Show your work.
a) Calculate the moles of Pb2+ and SO42- ions in the mixed solution.b) Which ion is limiting?c) Calculate the moles of PbSO4 formed. d) Calculate the mass of PbSO4 formed.
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05/16/21

I would just like to ask what happens to the charges (+2) on the salt of a heavy metal as it disrupts disulfide bridges.
like for example-CH2-S-S-CH2- + Hg2+ = CH2-S-Hg2+ and Hg2+-S-CH2 (were the salts retains its charges)or -CH2-S-S-CH2- + Hg2+ = CH2-S-Hg and Hg-S-CH2 (were the salts become... more
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05/16/21

Calculate the pH of a solution

Calculate the pH of a solution that is 0.127 M HCl.
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05/15/21

How do you calculate free energy?
How do you find the ΔG of this reaction and is this reaction favorable or unfavorable?2 AgNO3 + CaCl2 → 2 AgCl + Ca(NO3)2 Substance S (J/mol⋅K) Hf (kJ/mol) CaCl2 (aq) 60 -795.8 AgNO3... more
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05/15/21

What is the pH of a 2.9 M solution of HClO4? pH=
What is the pH of a 2.9 M solution of HClO4? pH=
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05/15/21

At 25 °C, how many dissociated OH− ions are there in 1257 mL of an aqueous solution whose pH is 1.74? number of OH− ions:
At 25 °C, how many dissociated OH− ions are there in 1257 mL of an aqueous solution whose pH is 1.74? number of OH− ions:
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05/15/21

At 25 °C, what is the hydroxide ion concentration, [OH−] , in an aqueous solution with a hydrogen ion concentration of [H+]=1.7×10−5 M? [OH−]=
At 25 °C, what is the hydroxide ion concentration, [OH−] , in an aqueous solution with a hydrogen ion concentration of [H+]=1.7×10−5 M? [OH−]=
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05/15/21

Identify the conjugate base for each acid. conjugate base of H2S : HS - HS− conjugate base of HSO−4 : SO_{2} -4 SO2−4 conjugate base of NH+4 :
Identify the conjugate base for each acid. conjugate base of H2S : conjugate base of HSO−4 :conjugate base of NH+4 :
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05/15/21

Identify the conjugate acid for each base. conjugate acid of HCO−3 : conjugate acid of SO2−4 : conjugate acid of NH3 :
Identify the conjugate acid for each base. conjugate acid of HCO−3 : conjugate acid of SO2−4 : conjugate acid of NH3 :
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05/15/21

Samantha wants to neutralize 1.21 L of 0.102 M KOH with 0.101 M HNO3. Show all calculations for the following questions.
a) Write a balanced equation for this reaction. b) What is the mole ratio between KOH and HNO3?c) How many moles of KOH  are present in 1.21 L of 0.102 M KOH solution?d) How many moles of HNO3 are... more
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05/15/21

What is the maximum number of grams of PH3 that can be formed when 6.20 g of phosphorus reacts with 4.00 g of hydrogen to form PH3?

What is the maximum number of grams of PH3 that can be formed when 6.20 g of phosphorus reacts with 4.00 g of hydrogen to form PH3?P4 + 6 H2 --> 4 PH3
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05/15/21

hi, pls help me how to solve this one using avogadro's law
1. A 25.5 liter balloon holding 3.5 moles of heliumleaks. If we are able to determine that 2 moles ofhelium escaped before the balloon was sealed,what would be the new volume of the balloon?2. If a... more
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05/15/21

Hi! pls help me to answer this science homework
1. A container holds 500 mL of CO 2 at 20°C and742 torr. What will be the volume of CO 2 if thepressure is increased to 805 torr and thetemperature is kept as is?2. A balloon contains 7.2 L of He.... more
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05/15/21

need help within the hour. Please help!
Calculate the [H+] in a solution with a pH of 1.9must use decimals
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05/15/21

I need help within the next hour. Please!
Equal volumes of 1M hydrochloric acid and 1M sodium hydroxide are mixed via a process known as titration. After mixing, at the equivalence point of the titration, the solution will be?weakly... more
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05/14/21

What mass of Pbl2 would be produced by the reaction of 10.5G of KI?
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