Answer:
easily forming bonds w/ atoms of other elements and combining w/ oxygen atoms to form new substance
Convert 3.9 kcal into calories.
[tex]3.9 ~\text{kcal} = 3.9 \times 1000 ~ \text{cal} = 3900~ \text{cal.}[/tex]
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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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
When 0.28g of a basic oxide, MO, is reacted with 250cm3 of 0.05moldm–3 hydrochloric acid the excess acid required 50cm3 of 0.05moldm–3 sodium hydroxide solution for neutralisation. Which one of the following is the relative atomic mass of M?
A 12
B 28
C 40
D 56
the answer is C but i have no idea how!
mol of excess acid: 50 cm ³x 0.05 M = 2.5 mlmol
mol of acid reacted: (250 cm³ x 0.05 M) - 2.5 mlmol = 10 mlmol = 10 x 10⁻³ mol
MM (molar mass) MO = mass : mol = 0.28 : 10 x 10⁻³ = 28
MM MO = Ar M + Ar O
28 = Ar M + 16
Ar M = 12
I think the answer is A
state the special characteristics of maxwell-boltzman statistics
Answer:
I need more info
Explanation:
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
brainly me bro pls pls
i need 4 brainly im willing to brainly me
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.
Which of the following items is NOT a compound?
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
How many grams of oxygen can be prepared by the decomposition of 12 grams of mercury oxide?
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
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).
__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
which is the best definition of resistance
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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What are the three main organic things found in healthy soil? (Select three.)
Answer:
Organic matter is composed of living things (plant roots and organisms), dead things (recent plant and animal residue), and very dead things (highly decomposed material, or humus).
Explanation:
hope this helps if not let me know have a great day
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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`Pb(NO3)2 (aq) + LiBr(aq) →
Answer:
PbBr2 + LiNO3
And goodluck
All of the following use subjective scoring EXCEPT:
A. Diving
B. Figure Skating
C. Archery
D. Gymnastics
Answer:
Archery
Explanation:
Archery is scored based on point values assigned to the rings on the target.
would the water in a pond or the water in a full bathtub have more thermal energy? Explain why.
In which of these systems is the entropy decreasing?
a liquid cooling
air escaping from a tire
snow melting
salt dissolving in water
Answer:
a liquid cooling
Explanation:
Liquid cooling results in liquid (more disorder) turning to solid (less disorder).
Entropy describe disorder in our system. Going from more disorder to less disorder decreases entropy.
Rest of the options increase entropy b/c gas escaping from tire releases gas from confined shape to vast environment, snow melting turns solid (order) into liquid (less order), and salt dissolving turns solid into liquid form.
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.
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.
A person wishes the heat pot of freshwater from 20°C to 100°C in order to boil water for pasta they calculate that their pot holds 2 kg of water and that they would need to apply 669,440 Joules of heat energy to produce the desire temperature change are the person calculations correct?defend your answer and demonstrate all relevant calculation
Q=mcΔt
669440 = 2.10³ x 4.184 x (100-20)
669440 = 669440 √ (correct)
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
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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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
There are 11 runners in a race. Medals are awarded for 1st, 2nd, and 3rd place. In how many different ways can the medals be awarded? 330 990 110 165
Answer:
990
Explanation:
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.
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)