428 Answered Questions for the topic chem

10/31/21

If the dose of a liquid medicine is 1/2 tsp q 8 h. How many days will a 120 ml liquid medicine will last?
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10/26/21

Find the electronegativity difference
What is the electronegativity difference of CH3OH?Carbon=2.5 Hydrogen=2.1 Oxygen=3.5a. 1.1b. 5c. 0.9d. none of the above
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10/26/21

Find the molarity of this solution.
In 20.0 degree Celsius, a 0.258 m aqueous solution of C6H12O6 (glucose) has a density of 1.017 g/mL. Find the molarity of this solution.
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10/25/21

AP chem question
A solution of 100.0 mL of 0.200 M KOH mixed with a solution of 200.0 ml of 0.150M NiSo4.a) Write the balanced chemical equation for the reaction that occursb) What precipitate forms?c) What is the... more
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10/22/21

chem question (redox)
How many electrons are being transferred in the reaction below when the reaction is balanced?(Cr2O4)^-2 + Cl^-3 -> Cr + Cl2
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Chem Chemistry

10/20/21

Chemistry Question PLEASEEE help
A student decides to find the molar enthalpy for the reaction between phosphoric acid and calcium hydroxide. They have a 0.250 M solution of Ca(OH)2, which they will use; they can only find a 2.1 M... more
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10/19/21

ap chem question
For each of the following write the blanched, net ionic reaction.a) Solid zinc hydroxide is sprinkled into a solution of iron (III) acetateb) A solution of cesium chloride has bromine liquid... more
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10/14/21

Ibuprofen (C13H18O2) is an analgesic (painkiller). What is the molar mass of ibuprofen?

Ibuprofen (C13H18O2) is an analgesic (painkiller). What is the molar mass of ibuprofen? 
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10/14/21

What is the mass of 1 mole of barium sulfate (BaSO4) use to take X rays of the gastrointestinal tract?
What is the mass of 1 mole of barium sulfate (BaSO4) use to take X rays of the gastrointestinal tract? a. 64 g b. 185.33 g c. 233.33 g d. 169.33 g
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10/14/21

A sample of gold contains 7.02 x 1024 atoms. How many moles of gold are there?
A sample of gold contains 7.02 x 1024 atoms. How many moles of gold are there? a. 11.7 x 1023 moles b. 7.02 moles c. 6.022 x 1023 moles d. 11.7 moles
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10/10/21

Chemistry Help... N2 + 3 H2 produces 2 NH3

How many moles of ammonia are produced when 2.5 moles of hydrogen (H2) react? How many moles of nitrogen (N2) are needed to react when 2.5 moles of hydrogen react?How many grams of ammonia are... more
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10/09/21

Balance the following chemical equation. Use coefficients in front the reactants or products that need to be balanced. If the coefficient is one, write the number "1"
_________________ MgCl2 + _________________ K → _________________ KCl + _________________ Mg
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10/09/21

Balance the following chemical equation.
Q1 _______________ NaN3 → _______________ Na + _______________ N2Q2_______________ N2H4 + _______________ Cl2 → _______________ N2 +  _______________ HCl
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10/09/21

Balance the following chemical reaction:
 _______________ Fe2O3 + _______________ C → _______________ Fe + _______________ CO2_______________ Li + _______________ N2 → _______________ Li3N
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10/09/21

Match is statement with the correct option: oxidation or reduction
The loss of electrons is _________________.The gain of electrons is _______________.Addition of oxygens is _______________.Removal of oxygens is _________________.Addition of hydrogens is... more
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10/04/21

I really need help with this question please and thank you!
When 1.00-gram sample of baking soda is heated, a gas is formed. The solid that remains weighs less than 1.00 g and does not have the same properties as the original sample. Is the baking soda an... more
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10/04/21

Classify as mixture or pure substance
Classify as mixture or pure substanceA. Gasoline B. Oxygen gas C. Milk D. Mercury (Hg) used in a thermometer E. A tablespoon of sugar (C12H22O11)
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10/04/21

Identify the change as Physical or Chemical
Identify the change as Physical or ChemicalA. Mothballs vaporize in a closet B. A flashlight corrodes on storage.C. A piece of rubber stretches when pulled.D. Alcohol feels cool when it evaporates... more
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10/04/21

Is the baking soda an element or compound? Why?
When 1.00-gram sample of baking soda is heated, a gas is formed. The solid that remains weighs less than 1.00 g and does not have the same properties as the original sample. Is the baking soda an... more
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09/30/21

Match the following statements with the correct answer
In a polar covalent bond, electrons are shared ___________________.The type of bond formed between calcium and bromine is ________________The type of bond formed between phosphorus and fluorine is... more
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09/29/21

Mass and percent yield?
Pinacol rearrangement experiment: Measured benzopinacol (start) = 0.502 gCollected solid (end) = 0.480 gWhat would the start and final mass be in mol?What would the percent yield be?
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09/27/21

Chem 105, Please help! super confused and lost on these!
Calculate the volume of 0.550-M NaOH solution needed to completely neutralize 98.3 mL of a 0.630-M solution of the monoprotic acid HNO3. 80.96 mL of a solution of the acid H2C2O4 is... more
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Chem Chemistry

09/19/21

Precent by Mass
An alloy is 12.2% Copper by mass in Tin. Copper makes up what percent of the atoms in this sample?
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Chem Chemistry

07/30/21

How do I find the concentration of A2− for a weak diprodic acid?
A solution contains the weak diprotic acid H2A in water. Given that the concentration of HA− generated from the first ionization of the parent acid, H2A, is 0.00137 M, what is the concentration of... more
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07/27/21

finding grams in chemistry

How many grams of water are in a puddle that contains 9.1 x1025 molecules of water (H2O)?
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