01/10/20

A snowflake contains 1.9 1018 molecules of water. How many moles of water does it contain?
A snowflake contains 1.9  1018 molecules of water. How many moles of water does it contain?
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01/09/20

41g of magnesium react with 11.86g of hydrochloric acid. Calculate the theoretical yield of the reaction. If the actual yield is 12g magnesium chloride, calculate the percent yield of the reaction.
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01/09/20

how many grams of potassium chlorate must react to form 50 grams of potassium chloride? The other product of the reaction is oxygen gas.
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01/09/20

40.0 grams zinc react with 18.00 grams of hydrochloric acid.
Calculate the theoretical yield of the reaction. If the actual yield is 23.0 grams of zinc chloride, what is the percent yield of the reaction.
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01/08/20

find the pH and pOH
a.) Find the pH of 9.87x10-1 M of Sr(OH)2b.) Find the pOH of 5.71x10-2 M of K2O
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01/08/20

The calorimetric equation below calculates a heat transfer involving water. What action does the equation describe?
a. Ice meltingb. water heating c. vapor condensing d. water cooling
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01/08/20

How would a decrease in pressure affect this system?
The reaction below shows a system at equilibrium. 
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01/08/20

When a metal reacts with nitric acid it does not evolve hydrogen gas why?

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01/08/20

What is the theoretical value and yield for Sulphuric Acid and Calcium Carbonate?

Experiment was different concentrations of 0.5, 0.4, 0.3 concentrations of sulphuric acid reacted with calcium carbonate (1.027g). The loss of mass was calculated.
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01/07/20

2CH 3 OH(l)+3O 2 (g) 4H 2 O(l)+2CO 2 (g) 2CH2OH (302 ( ) - ( 1 ) ( ) \Delta H=-1452.8 kJ/mol. What is the value of \Delta H if (a) the bc equation is multi plied throughout by 2

Consider this reaction : 2CH 3 OH(l)+3O 2 (g) 4H 2 O(l)+2CO 2 (g) 2CH2OH (302 ( ) - ( 1 ) ( ) \Delta H=-1452.8 kJ/mol.  What is the value of \Delta H if (a) the equation is multi plied... more
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01/04/20

Enthalpy Formation

A scientist measures the standard enthalpy change for the following reaction to be -783.2 kJ :2CO(g) + 2 NO(g)2CO2(g) + N2(g)Based on this value and the standard enthalpies of formation for the... more
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01/03/20

Is fluoxetine hydrochloride an ionic or covalent bond?
I tried to figure it out myself but it wasn't adding up, need it for tomorrow in class.
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12/31/19

someone help me.
15.4g of methanol (CH3OH 32.042 g/mol) reacts completely according to the following reaction: CH3OH (g) -----> CH2O(g) + H2(g) if 12.35 g of formaldehyde (30.026 g/mol) is produced, what is... more
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12/28/19

how many electrons are transferred in the balanced reduction half-reaction?
Cr2O72–(aq) + NO2–(aq) → Cr3+(aq) + NO3–(aq)If the reaction occurs in an acidic solution where water and H+ ions are added to the half-reactions to balance the overall reaction, how many electrons... more
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12/27/19

Which of the following doesn't react with potassium hydroxide and why?

Which of the following doesn't react with potassium hydroxide and why?A)solid aluminium oxideB) copper(II) sulphate solutionC) solid ammonium chlorideD) sodium sulphate solution
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12/25/19

How many grams of Cu(OH)2 can react with this solution?
132 g of H2SO4 in solution is 24,5% its mass. How many grams of Cu(OH)2 can react with this solution?Cu(OH)2 (s) + H2SO4 (aq) -> CuSO4 (aq) + 2H2O (l)
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12/24/19

Question about the chemistry equations
Hello, I've just started learning basic chemistry and I'm confused now. What's the difference between those two? I have a test and only one of them is the right one.1) NaCl+H2SO4=HCl+NaHSO42)... more
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12/24/19

Consider the half equation IO3^-+xH2O+ye^-》IO^-+zOH^-
X. Y. Z A. 1. 2. 2 B. 2. 4. 4 C. 3. 6. 6 D. 4. 8. 8
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12/21/19

A 30.6 g sample of nitrogen gas combines completely with 6.6 g of hydrogen gas to form ammonia. What is the mass of ammonia formed?
A 30.6 g sample of nitrogen gas combines completely with 6.6 g of hydrogen gas to form ammonia. What is the mass of ammonia formed?
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12/21/19

What is the volume of a sample that has a mass of 10 g and a density of 5 g/mL?
What is the volume of a sample that has a mass of 10 g and a density of 5 g/mL?
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12/21/19

An object with a mass of 3.4 g raises the level of water in a graduated cylinder from 25.1 mL to 30.1 mL. What is the density of the object?
?An object with a mass of 3.4 g raises the level of water in a graduated cylinder from 25.1 mL to 30.1 mL. What is the density of the object?
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12/21/19

An object with a mass of 3.4 g raises the level of water in a graduated cylinder from 25.1 mL to 30.1 mL. What is the density of the object?
An object with a mass of 3.4 g raises the level of water in a graduated cylinder from 25.1 mL to 30.1 mL. What is the density of the object?
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12/21/19

What is the percent by mass of Y?
If 3.9 g of element X reacts with 15.2 g of element Y to form the compound XY, what is the percent by mass of X in the compound? What is the percent by mass of Y?
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12/21/19

You have a 17 g sample of ethanol with a density of 0.7893 g/mL. What volume of ethanol do you have?

You have a 17 g sample of ethanol with a density of 0.7893 g/mL. What volume of ethanol do you have? 
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12/20/19

To understand the structural activity relationship of a peptide drug molecule; see details below.

Hello, I need help with a mix of microbiology/biochem/chem/bio. I did an experiment where I made mimics of TB antibiotics in a lab. I need to understand the structural activity relationship of the... more
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