[ad_1]

Get college assignment help at uniessay writers toothpaste contains 0.24% by mass sodium flouride used to prevent dental cavities. One tube contains 119g of toothpaste. How many moles of NaF are in the tube?

how many joules are there in 162 calories? (1 cal =

how many joules are there in 162 calories? (1 cal = 4.18 J)

determining the enthalpy of reaction between citric acid (H3Cit) and sodium

determining the enthalpy of reaction between citric acid (H3Cit) and sodium hydroxide (NaOH).

# Now look at the piece of paper. Using your knowledge

# Now look at the piece of paper. Using your knowledge of atoms from the Nuclear unit, * Describe two differences in the physical properties of water and the piece of paper. * Describe reasons the paper’s physical properties are different from the water’s physical properties.

An auto mechanic spills 72 mL of 2.6 M H2SO4 solution

An auto mechanic spills 72 mL of 2.6 M H2SO4 solution from a rebuilt auto battery. How many milliliters of 1.5 M NaHCO3 must be poured on the spill to react completely with the sulfuric acid?

How much heat is required to warm 1.50 L of water

How much heat is required to warm 1.50 L of water from 26.0^circ C to 100.0 ^circ {rm C}? (Assume a density of {1.0;{rm {g}}}/{{rm {mL}}} for the water.)

how many atoms of C are contained in 45.6 g of

how many atoms of C are contained in 45.6 g of C6H6

A total of 2.00 mols of a compound is allowed to

A total of 2.00 mols of a compound is allowed to react in a foam coffee cup that contains 189 grams of water. The reaction caused the temperature of the water to rise from 21.0 ºC to 24.7 ºC. What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself.

A 100.-L flask contains a mixture of methane (CH4) and argon

A 100.-L flask contains a mixture of methane (CH4) and argon gases at 25 degrees Celsius. The mass of argon present is 228 g and the mole fraction of methane in the mixture is 0.650. Calculate the total kinetic energy of the gaseous mixture.

A 0.682-gram sample of an unknown weak monoprotic organic acid, HA,

A 0.682-gram sample of an unknown weak monoprotic organic acid, HA, was dissolved in sufficient water to make 50 milliliters of solution and was titrated with a 0.135-molar NaOH solution. After the addition of 10.6 milliliters of base, a pH of 5.65 was recorded. The equivalence point (end point) was reached after the addition of 27.4 milliliters of the 0.135-molar NaOH.

A 0635 milgram sample of a diprotic acid is dissolved in

Get college assignment help at uniessay writers A 0635 milgram sample of a diprotic acid is dissolved in 100 ml of water and titrated with 0.125 M NaOH using a pH meter. If the pH is 4.35 after the addition of 14.0 ml and the first equivalence is reached at a pH of 7.90 after the addition og 48.6 ml, caculate the k1, k2, molecular weight, the pH of the second equiv. point solution and was titrated with a 0.135-molar NaOH solution. After the addition of 10.6 milliliters of base, a pH of 5.65 was recorded. The equivalence point (end point) was reached after the addition of 27.4 milliliters of the 0.135-molar NaOH.

A student prepared a stock solution by dissolving 2.50 g of

A student prepared a stock solution by dissolving 2.50 g of KOH in enough water to make 150. mL of solution. She then took 15.0 mL of the stock solution and diluted it with enough water to make water to make 65.0 mL of a final solution.

A student placed 13.0 g of glucose (C6H12O6) in a volumetric

A student placed 13.0 g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100. mL mark on the neck of the flask was reached. The flask was then shaken until the solution was uniform. A 35.0 mL sample of this glucose solution was diluted to 0.500 L. How many grams of glucose are in 100 mL of the final solution?

For an atom with the energy levels below, what wavelength light

For an atom with the energy levels below, what wavelength light (in nm) will be emitted in a transition between E3 and E1 ? What wavelength of light must be absorbed to cause a transition between E4 and E5 ? E5 = -6.0 kJ/mol E4 = -17.0 kJ/mol E3 = -39.5 kJ/mol E2 = -200.0 kJ/mol E1 = -1150.0 kJ/mol

“For an atom with the energy levels below, what wavelength light

“For an atom with the energy levels below, what wavelength light (in nm) will be emitted in a transition between E3 and E1 ? What wavelength of light must be absorbed to cause a transition between E4 and E5 ? E5 = -6.0 kJ/mol E4 = -17.0 kJ/mol E3 = -39.5 kJ/mol E2 = -200.0 kJ/mol E1 = -1150.0 kJ/mol”

How many photons are required to heat 200 mL of coffee

How many photons are required to heat 200 mL of coffee from 24^c C to 62^ C?

How many grams of water are needed to react with 70.0

How many grams of water are needed to react with 70.0 g {rm CaCN_2}?

How many grams of KHP will be required to titrate 50

How many grams of KHP will be required to titrate 50 mL of .12 M NaOH solution?

which of the following substances are likely to be soluble in

which of the following substances are likely to be soluble in water ZnS, Au2(CO3)3, PbCl2, MnO2

Can an atom absorb or emit light with a wavelength of

Can an atom absorb or emit light with a wavelength of 4434 nm? Can it absorb or emit light with a wavelength of 654 nm? If so, state which energy levels the transition occurs between. Given: E5 = -6.0 kJ/mol E4 = -17.0 kJ/mol E3 = -39.5 kJ/mol E2 = -200.0 kJ/mol E1 = -1150.0 kJ/mol

A chemist wants to prepare 0.53 M HCl. Commercial hydrochloric acid

A chemist wants to prepare 0.53 M HCl. Commercial hydrochloric acid is 12.4 M. How many milliliters of the commercial acid does the chemist require to make up 1.55 L of the dilute acid? mL 6. –/2 points 0/5 submissions Notes Question: EbGam9 4.PP.092. How many milliliters of 0.229 M KMnO4 are needed to react with 3.38 g of iron(II) sulfate, FeSO4? The reaction is as follows. 10 FeSO4(aq) 2 KMnO4(aq) 8 H2SO4(aq) → 5 Fe2(SO4)3(aq) 2 MnSO4(aq) K2SO4(aq) 8 H2O(l) mL 7. –/2 points 0/5 submissions Notes Question: EbGam9 4.GP.112. A 70.0-g sample of oxalic acid, H2C2O4, was dissolved in 1.00 L of solution. How would you prepare 1.00 L of 0.145 M H2C2O4 from this solution? Place mL of the M solution in a 1 L volumetric flask, and dilute to 1.00 L. 8. –/2 points 0/5 submissions Notes Question: EbGam9 4.GP.114. An aqueous solution contains 4.90% NH3 (ammonia) by mass. The density of the aqueous ammonia is 0.979 g/mL. What is the molarity of NH3 in the solution? M 9. –/2 points 0/5 submissions Notes Question: EbGam9 4.GP.116. Bone was dissolved in hydrochloric acid, giving 50.0 mL of solution containing calcium chloride, CaCl2. To precipitate the calcium ion from the resulting solution, an excess of potassium oxalate was added. The precipitate of calcium oxalate, CaC2O4, weighed 1.437 g. What was the molarity of CaCl2 in the solution? M 10. –/2 points 0/5 submissions Notes Question: EbGam9 4.SP.126. If 45.7 mL of a solution containing 8.30 g of silver nitrate is added to 30.6 mL of 0.516 M sodium carbonate solution, calculate the molarity of silver ion in the resulting solution. (Assume volumes are additive.) M 11. –/2 points 0/4 submissions Notes Question: EbGam9 4.SP.132. Identify each of the following reactions as being a neutralization, precipitation, or oxidation-reduction reaction. (a) 2 Ca(s) O2(g) → 2 CaO(s) neutralization reaction precipitation reaction oxidation-reduction reaction (b) Na2SO4(aq) Hg(NO3)2(aq) → HgSO4(s) 2 NaNO3(aq) neutralization reaction precipitation reaction oxidation-reduction reaction (c) 2 HCl(aq) Ca(OH)2(aq) → CaCl2(aq) 2 H2O(l) neutralization reaction precipitation reaction oxidation-reduction reaction (d) Mg(NO3)2(g) Na2S(aq) → MgS(s) 2 NaNO3(aq) neutralization reaction precipitation reaction oxidation-reduction reaction 12. –/2 points 0/5 submissions Notes Question: EbGam9 4.CSP.144. What volume of a solution of ethylene glycol, C2H6O2, that is 55.5% ethylene glycol by mass contains 0.344 mol C2H6O2? The density of the solution is 1.072 g/mL. L

The post toothpaste contains 0.24% by mass sodium flouride used to prevent dental appeared first on uniessay writers.

[ad_2]

Source link