10/11/21

The momentum of an object can change
true or false .
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10/11/21

Percent of error
After completing the experiment a student extracts a sample of calcium carbonate with a mass of 0.819 grams from an antacid tablet that claims to have 1000 mg of calcium carbonate what is the... more
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10/11/21

Draw a 3 dimensional model for a molecule

Draw the correct Lewis dot CH4 H | H - C - H ... more
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10/11/21

How many grams of oxygen are contained in 8.50 g of Al2(SO4)3?
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10/11/21

How to balance Cu(NO3)2+AlCl3 to CuCl2+Al(NO3)3
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10/11/21

exactly 25.0 mL of an aqueous solution of barium hydroxide required 32.0 mL of 0.200 M nitric acid to neutralize it. what is the concentration of the barium hydroxide solution?
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10/11/21

Needing help for chemistry
How many grams of oxygen are combined with 14.6 grams of iron to make the iron(II) oxide compound?
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10/10/21

If 6.39 g of CuNO3 is dissolved in water to make a 0.180 M solution, what is the volume of the solution in milliliters?
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10/10/21

How many milliliters of 10.5 M HCl(aq) are needed to prepare 785.0 mL of 1.00 M HCl(aq)?
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10/10/21

What is the number of moles from this chemical equation below?
2NaOH(aq) + CaBr2(aq) ==> Ca(OH)2 + 2NaBr(aq)
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10/10/21

What is the type of reaction of this balanced equation?
2NaOH(aq) + CaBr2(aq) ==> Ca(OH)2 + 2NaBr(aq)
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10/10/21

How do make a complex solution
If you want to make a chemical solution with a final volume of 1 ml containing10 mM Tris-HCL (pH 8)50 mM NaCl0.5 mM EDTA1.0 mM DTTHow do you calculate this?Thank you!Lisa
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10/10/21

What is the number of particles or formula units of this chemical eqution?
2NaOH(aq) + CaBr2(aq) ==> Ca(OH)2 + 2NaBr(aq)
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10/09/21

Chem help please
Combining 0.341 mol Fe2O3 with excess carbon produced 17.3 g Fe. Fe2O3+3C⟶2Fe+3CO What is the actual yield of iron in moles? actual yield: What is the theoretical yield of iron in moles?... more
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10/09/21

Reactions in Which a Solid Forms
Question: The compound magnesium nitrite is a strong electrolyte. Write the reaction when solid magnesium nitrite is put into water.Include states of matter in your answer.My answer:Mg(NO2)2(s)... more
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10/09/21

Enthalpy Formation from Enthalpy Reaction
A scientist measures the standard enthalpy change for the following reaction to be -103.2 kJ :CO(g) + Cl2(g)COCl2(g)Based on this value and the standard enthalpies of formation for the other... more
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10/09/21

Enthalpy Reaction from Enthalpy Formation
Using standard heats of formation, calculate the standard enthalpy change for the following reaction.Fe3O4(s) + 4H2(g)3Fe(s) + 4H2O(g)
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10/09/21

General chemistry
1 all nitrates are insoluble true or false2 iron is a transition metal true or false 3 sodium phosphate is water soluble because it contains a group 1A metal true or false4 the oxidation number of... more
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10/09/21

Identify each type of reaction:
C2H5OH + 3 O2 → 2 CO2 + 3 H2O2 Ca (s) + O2 (g) → 2 CaO (s) CaCO3 (s) → CaO (s) + CO2 (g)C + 2H2 → CH4a. combustionb. decompositionc. combination
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10/09/21

Match the following chemical reactions with the answers "YES" or "NO". Are the following chemical equations balanced?
2 Hg (l) + O2 (g) → Hg2O2 (s)C2H4 (g) + 2 O2 (g) → 2 CO2 (g) + 2 H2O (l)Mg(NO3)2 (s) + 2 Li (s) → Mg (s) + 2 LiNO3 (s)H2 (g) + O2 (g) → H2O (l)a. Nob.Yes
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10/09/21

What is yhe heat, q, required to melt 10 grams of ice in a) Joules b) calories?
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10/08/21

A chemist requires 0.330 mol Na2CO3 for a reaction. How many grams does this correspond to?
A chemist requires 0.330 mol Na2CO3 for a reaction. How many grams does this correspond to?Mass =?
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10/08/21

Micro chemistry

According to Chamot and Mason’s Handbook of Chemical Microscopy, Vol. II, a dilute solution of hydrochloric acid can be used to test for the presence of lead ion. To prepare a positive control... more
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10/08/21

Enthalpy Reaction from Enthalpy Formation
Using standard heats of formation, calculate the standard enthalpy change for the following reaction.H2(g) + Cl2(g)2HCl(g)
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10/08/21

Calculate the mass of sodium hydroxide needed to prepare 100 mL of a 0.10 M solution.
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