428 Answered Questions for the topic chem

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

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.

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

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
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

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

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? 

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

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

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

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

Balance the following chemical equation.

Q1 _______________ NaN3 → _______________ Na + _______________ N2Q2_______________ N2H4 + _______________ Cl2 → _______________ N2 +  _______________ HCl

Balance the following chemical reaction:

 _______________ Fe2O3 + _______________ C → _______________ Fe + _______________ CO2_______________ Li + _______________ N2 → _______________ Li3N

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

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

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)

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

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

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

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?

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
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?
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

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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