Answer:
Explanation:
Salt (sodium chloride) is made from positive sodium ions bonded to negative chloride ions. Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions.
Given the specific heat of lead is 0.129 J/gK and that it takes 93.45 of energy to heat a sample of lead from 22.3°C to 40.4°C find the mass of the lead.
40.0 g
54 g
54.0 g
40 g
Answer:
nice
Explanation:
you can do it just try your best
A student dissolves 4.51 grams of sodium hydroxide in 100.0 mL of water at 19.5 °C in a calorimeter. As the sodium hydroxide dissolves, the temperature of the surrounding water increases to 31.7 °C. What is the heat involved in the dissolving of the sodium hydroxide (the q)? Omg help meeeeee I’m in honors chem!
The heat involved in the dissolution of sodium hydroxide in the 100 mL of water is 5104.48 J
Data obtained from the question Mass of NaOH = 4.51 gVolume of water = 100 mL Initial temperature of water (T₁) = 19.5 °CFinal temperature of water (T₂) = 31.7 °C Heat of dissolving NaOH =?How to determine the heat
Heat lost by NaOH = heat gained by the water
Thus, we shall determine the heat gained by the water in order to obtain the heat of dissolution of NaOH.
The heat gained by the water can be obtained as follow:
Mass of water (M) = 100 gInitial temperature of water (T₁) = 19.5 °CFinal temperature of water (T₂) = 31.7 °CChange in temperature (ΔT) = 31.7 – 19.5 = 12.2 °C Specific heat capacity of the water (Cᵥᵥ) = 4.184 J/gºC Heat (Q) =?Q = MCΔT
Q = 100 × 4.184 × 12.2
Q = 5104.48 J
Thus, the heat of dissolution of NaOH is 5104.48 J
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Which is more soluble in 100grams of H2O at 70 degrees Celsius?
A) NH4Cl
B) NaNO3
C) KCL
D) KNO3
Answer:
KCL
Explanation:
is more soluble in 100grams of H2O at 70 degrees Celsius?
According to the ideal gas law, what
will be the volume of 0.25 mol of
nitrogen at 0.82 atm pressure and
57°C temperature?
Explanation:
Ideal Gas Law
PV = n R T
V = n R T / P n = moles R = gas constant = .082057 L atm / ( K mol)
T is in Kelvin
V = .25 moles * .082057 * (273.15 + 57) K / .82 atm = 8.3 moles
( two Sig Dig)
At a particular temperature the solubility or NE in water is 0.0240 M when the partial pressure is 0.220 atm. What will the solubility (in m) be when the partial pressure of NE is 1.05atm?
It is expected at 1.05 atm the solubility increases if compared to the solubility at 0.222 atm.
What is the relationship between solubility and pressure?In general, an increase in pressure leads to an increase in solubility. In the same way, a decrease in pressure will decrease solubility.
What will happen at if the pressure is 1.05 atm?Considering the pressure increased, the most likely result is for the solubility to proportinally increase.
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how would the function of the galvanic cell be affected if the salt bridge contained a very diluted solution of NaNo3? explain
Answer:
The salt bridge serves to complete the electrical circuit in the galvanic cell. It is pertinent that the salt bridge ions are in high concentrations as this allows electron mobility and keeps each half cell electronically neutral. The diluted salt bridge wuld cause a buildup of positive charge in the anode and negative charge in the cathode and the electrode half reactions which either reduce or oxidise species would halt. Causing the cell to stop producing electronic energy, impedeing the proper functioning of the galvanic cell.
Which of the following choices could be an isomer of a compound with an empirical formula of C₄H₁₀O₃?
CHO
CH₂O
C₈H₂₀O₆
C₅H₁₁O₄
The statement, that describe an isomer of a compound with an empirical formula of C₄H₁₀O₃ is "CHO."
What is an empirical formula?The empirical formula of an organic compounds is the lowest whole number ratio of atoms contained in the substance, as defined in chemistry. The empirical formula gives the minimal ratio of the number of various atoms that existing. It's an empirical formula, if the formula is shortened, whereas not the exact number of atoms in the molecule, The given isomer of a compound is C₄H₁₀O₃. For this isomer, CHO is the empirical formula.
Hence, the correct answer is CHO.
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In order to maintain a sodium chloride (NaCl) concentration similar to ocean water, an aquarium must contain 4.7 g NaCl per 100 g of water. What is the percent by mass of NaCl in the solution?
Answer:
0.047
Explanation:
mass percent is part/whole mass
Describe briefly a chemical test to identify a sample of each of the following gases in the laboratory. For each test include a short description of the procedure (method) and the expected observations.
Hyrogen gas
Oxygen gas
Carbon dioxide gas
Answer:
Am I the bad guy for killing my fish, let me explain?
Explanation:
The fish said a bad word that was incredibly inappropriate, so then I told him to never say that again. He responds with, "No, I CAN SAY WHATEVER I WANT." After that I told him to not yell at me and then I killed him, remember he's a fish (GoldFISH).
Calculate the partial
pressure of argon in a
gas mixture with a total
pressure of 2.4 atm.
The partial pressures
of the other gases are:
O2 = 128.0 mmHg
He = 167.5 mmHg and
Ne= 760.0 mmHg
The required partial pressure of argon gas present in the mixture is 1.02 atm.
What is Dalton law of gas?Dalton's law of gas states that total pressure of any mixture of gas is sum of the partial pressure of all the gases present in that mixture.
Given that,
Total pressure of mixture = 2.4 atm
Partial pressure of argon = ?
Partial pressure of oxygen = 128 mmHg = 0.168 atm
Partial pressure of helium = 167.5 mmHg = 0.220 atm
Partial pressure of neon = 760 mmHg = 1 atm
On putting all these values according to the definition we get the partial pressure of argon gas as:
Partial pressure of argon = 2.4 - (0.168 + 0.22 + 1) = 1.02 atm
Hence required partial pressure of argon gas is 1.02 atm
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If 150 grams of water is heated from 20°C to 30°C, the number of joules of
heat energy absorbed is...
Answer:
29/43
Explanation:because of the numbers
The beakers on the left and right both contain the same amount of HCL (liquid) and the same mass of calcium carbonate (solid). In which beaker will the reaction rate be the greatest?
A) The reaction rate will be highest in beaker 1 because there is a larger surface area of calcium carbonate.
B) The reaction rate will be highest in beaker 2 because there is a larger surface area of calcium carbonate.
C) The reaction rate will be highest in beaker 1 because there is a smaller surface area of calcium carbonate.
D) The reaction rate will be highest in beaker 2 because there is a smaller surface area of calcium carbonate
Answer:
B
Explanation:
Smaller pieces results in a larger surface area, therefore the answer is beaker B.
A farmer buys a new plot of land on which to grow crops. The land he buys is very flat. The farmer's main concern with this plot of land is wind erosion because certain seasons are very windy in this area. He has a large budget for the project, but he does not want to spend a lot of time or money maintaining any erosion control method that he installs.
Which method of erosion control is probably most suitable for the farmer to use?
A. contour plowing
B. buffer strips
C. terracing
D. windbreak
which is the best definition of resistance
state the special characteristics of maxwell-boltzman statistics
Answer:
I need more info
Explanation:
Which elements occupy the same group in the periodic table
Answer:
Elements that occupy the same column on the periodic table
Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S(g) + 3F2(g) ->SF6(g) If 50 g S is allowed to react as completely as possible with 105.0g F2(g), how many grams ofn SF6 can we get?
The quantity of SF6 that we can get is = 228.2g
Calculation of product formationThe quantity of S that reacted = 50g
The quantity of F2(g)that reacted = 105.0g
Therefore the quantity of SF6 that will be produced = ?
But molar mass of sulphur = 32g/mol
molar mass of SF6(g)= 146.06 g/mol
If 32g of S = 146.06 g of SF6
50 g of S = x
Make X the subject of formula,
X = 50×146.06/32
X = 7303/32
X = 228.2g of S
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At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
Of the following substances, only______ has London dispersion forces as the only
intermolecular force.
HCI
O Kr
O CH3OH
NH3
O H₂S
Answer:
HCI
Explanation:
thats the sorrect one
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1. What is the nuclide symbol for an atom which has 43 protons, 55 neutrons and 39 electrons? (1) A. 98Tc++ B. 93Cs+ C. ABY D. 43Tct-
mass number = proton+neutron
mass number = 43+55 = 98
atomic number = proton = 43
charge = proton - electron = 43 - 39 = +4
symbol : ⁹⁸Tc⁺⁴
Substances in a fire extinguisher help prevent air from reaching a burning material. Why would this be a good way to fight a fire?
Answer:
because of the substance contained in a fire extingudher it woulfnt start a fire.
When all the atoms of particular type of matter are the same, the matter is a
Answer:
an element.
Explanation:
When all the atoms contain a nucleus with the same amount of protons then each atom is classified as the same element. Hence multiple atoms and a larger quantity of atoms of the same element is still just the same single element.
What is the wavelength of a wave that has a frequency of 60 Hz and a speed
of 45 m/s?
O A. 0.75 m
O B. 15 m
O c. 1.3 m
D. 2700 m
The wavelength of the wave having a frequency of 60 Hz and a speed of 45 m/s is 0.75 m (Option A)
Relationship between velocity, frequency and wavelengthThe velocity, frequency and wavelength are related according to the following equation:
v = λf
where
v is the velocityλ is the wavelengthf is the frequencyHow to determine the wavelengthFrequency (f) = 60 HzVelocity (v) = 45 m/sWavelength (λ) = ?λ = v / f
λ = 45 / 60
λ = 0.75 m
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__Ag+__O2->__Ag20
what's the reaction?
Explanation:
4Ag + O2 -> 2Ag2O
Combination reaction
Synthesis reaction
the reaction of 2 elements forming compounds
4Ag + O₂ ⇒ 2Ag₂O
If 3 moles of chlorine gas are reacted with excess sodium iodide, how many moles of I2 will be formed? (balance first!)
Cl2+ NaI → NaCl + I2
3 moles of I2 will be formed from 3 moles of chrlorine gas.
Explanation:
This is because, when you balance the given equation it allows for the mole ratio between the two given elements to be 1:1 so therefore 3 moles of chlorine gas will produce 3 moles of I2.
Which prefix is used in the name of a stereoisomer to indicate that the
functional groups are on the same side of the double bond?
Answer:
"cis" (Latin for Side)
How much energy does a 445 nm wave of light have? (The speed of light in a
vacuum is 3.00 x 108 m/s, and Planck's constant is 6.626 x 10-34 J•s.)
Answer:
A
Explanation:
To calculate questions like this, you need to make use of the equation below:
E = hν
E is the energy, h is Planck's constant, and ν is the frequency.
Also, another important formula you need for this question is the following:
ν = c / λ
ν is the frequency, c is the speed of light, and λ is the wavelength.
Therefore, E = hν = hc/λ.
Also remember to convert nm wavelength to meters.
To answer the question, E = hc/λ = ((6.626*10^-34 J•s)(3*10^8 m/s))/(4.45*10-7 m) = 4.42 • 10^-19 J = A
What does the strong nuclear force do?
Answer:
The strong force binds quarks together in clusters to make more-familiar subatomic particles, such as protons and neutrons. It also holds together the atomic nucleus and underlies interactions between all particles containing quarks.
Balance this equation:
Al(s) + O2 (g) -> Al2O3 (s)
Mole O2 = 9.10 g/32 g/mol = 0.2844 mol From the balanced equation, the mole ratio of O2 to Al2O3 is 3:2. This means that 3 moles of O2 react with Al to produce 2 moles of Al2O3.
Convert 3.9 kcal into calories.
[tex]3.9 ~\text{kcal} = 3.9 \times 1000 ~ \text{cal} = 3900~ \text{cal.}[/tex]