Answer:
2.0 km/hr
Explanation:
6.0 km/3.0 hrs
= 2.0 km/hr
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john dalton's original atomic theory contained the following key ideas. which part(s) of these ideas was/were incorrect?
John Dalton's original atomic theory contained the following key ideas and the incorrect one is that elements are made of tiny indivisible particles called atoms and is denoted as option A.
What is Atom?This is defined as the smallest unit of matter which forms a chemical element and Dalton proposed that it was indivisible which was later proved wrong.
It was later discovered that atom is made up of sub atomic particles such as proton, electron and neutron. This was therefore the reason why option A was chosen as the most appropriate choice.
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The options include:
A. elements are made of tiny indivisible particles called atoms
B. Atoms are unchanged in chemical reaction
C. Atoms can join together in whole number ratios to form compounds.
D. The atoms of each element are unique
Calculate the molar mass of B(NO3)3 ?
The molar mass of B(NO₃)₃ - Boron nitrate : 196.822 g/mol
Further explanationIn stochiometry therein includes
Relative atomic mass (Ar) and relative molecular mass / molar mass (M)
So the molar mass of a compound is given by the sum of the relative atomic mass of Ar
M AxBy = (x.Ar A + y. Ar B)
The molar mass of B(NO₃)₃ - Boron nitrate :
M B(NO₃)₃ = Ar B + 3. Ar N + 9.Ar O
M B(NO₃)₃ = 10.811 + 3. 14,0067 + 9. 15,999
M B(NO₃)₃ = 196.822 g/mol
what elements are in a carboxyl group
Carbon bonded to both an oxygen bonded to a hydrogen.
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More mass
9 Calculate A block of wood has a mass of 120 g
and a volume of 200 cm³. What is the density of
the wood?
Answer:
Explanation:
The density is measured by: D=mV . Therefore, for the piece of wood in question the density could be calculated by: D=mV=57g125cm3=0.46gcm3 .
I just need help plz!
_______ is a nanomaterial that is often used with other compounds to desalinate and decontaminate water.
The electrical behavior of semiconductor devices and electronics can be engineered using a process called _______.
Answer:
Graphene is a nanomaterial that is often used with other compounds to desalinate and decontaminate water.
The electrical behavior of semiconductor devices and electronics can be engineered using a process called Doping
Explanation:
When more than one variable is an experiment is changed at a time, the scientist
Answer:
Nepal is rich in biodiversity
You dissolve 8.65 grams of lead(II) nitrate in water, and then you add 2.50 grams of aluminum. This reaction occurs: 2Al(s) + 3Pb(NO3)2(aq) → 3Pb(s) + 2Al(NO3)3(aq). What’s the theoretical yield of solid lead? Use the ideal gas resource and the periodic table. A. 5.41 g B. 11.2 g C. 19.2 g D. 28.8 g Reset
Answer: A. 5.41
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Al=\frac{2.50g}{27g/mol}=0.0926moles[/tex]
[tex]\text{Moles of} Pb(NO_3)_2=\frac{8.65g}{331g/mol}=0.0261moles[/tex]
[tex]2Al(s)+3Pb(NO_3)_2(aq)\rightarrow 3Pb(s)+2Al(NO_3)_3(aq)[/tex]
According to stoichiometry :
3 moles of [tex]Pb(NO_3)_2[/tex] require = 2 moles of [tex]Al[/tex]
Thus 0.0261 moles of [tex]Pb(NO_3)_2[/tex] will require=[tex]\frac{2}{3}\times 0.0261=0.0174moles[/tex] of [tex]Al[/tex]
Thus [tex]Pb(NO_3)_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Al[/tex] is the excess reagent.
As 3 moles of [tex]Pb(NO_3)_2[/tex] give = 3 moles of [tex]Pb[/tex]
Thus 0.0261 moles of [tex]Pb(NO_3)_2[/tex] give =[tex]\frac{3}{3}\times 0.0261=0.0261 moles[/tex] of [tex]Pb[/tex]
Mass of [tex]Pb=moles\times {\text {Molar mass}}=0.0261moles\times 207g/mol=5.41g[/tex]
Thus 5.41 g of solid lead will be produced from the given masses of both reactants.
Justin drives to school heading about 3 miles north from home and then head east for 1.5 miles. it takes him 45 minutes to get to school. what was his average speed/velocity?
If Justin drives 3 miles north and 1.5 miles to the east to get to school and takes him 45 minutes, his average speed/velocity is 6 miles/hour north east.
Speed is the amount of distance traveled by an object per unit of time. On the other hand, velocity is the amount of speed and the direction it is moving. Speed is a scalar quantity while velocity is a vector quantity.
To get the speed of Justin driving from home to his school, divide the distance he traveled by the amount it took him.
speed = (3 miles + 1.5 miles) / 45 minutes(1hr/60 minutes)
speed = 6 miles/hour
Taking note of the direction he traveled, the velocity will be:
velocity = 6 miles/hour north east
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The graph indicates what about the relationship between atmospheric carbon dioxide and time
A)
over time, the amount of atmospheric carbon dioxide increases
B)
over time, the amount of atmospheric carbon dioxide decreases
over time, the amount of atmospheric carbon dioxide stays the same
D)
over time, the amount of atmospheric carbon dioxide does not change
Answer:
A)
over time, the amount of atmospheric carbon dioxide increases
Explanation:
Answer: a) over time, the amount of atmospheric carbon dioxide increases
Explanation:
Calculate the pH when 25.0ml of 0.90M CH3COOH is mixed with 25.0ml of 0.45M NaOH.
pH of mixed solution = 4.3
Further explanationA buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.
The buffer solution can be acidic or basic
Acid buffer solution consists of weak acids and their salts.
[tex]\tt \displaystyle [H^+]=Ka\times\frac{mole\:weak\:acid}{mole\:salt\times valence}[/tex]
valence according to the amount of salt anion
mol CH₃COOH = 25 ml x 0.9 = 22.5 mlmol
mol NaOH = 25 ml x 0.45 = 11.25 mlmol
ICE method :
Reaction
NaOH + CH₃COOH ---> CH₃COONa + H₂O
11.25 22.5
11.25 11.25 11.25 11.25
11.25 11.25 11.25
mol acid = 11.25, mol salt = 11.25, Ka CH₃COOH = 5.10⁻⁵
Then [H⁺]=
[tex]\tt [H^+]=5.10^{-5}.\dfrac{11.25}{11.25\times 1}\rightarrow salt~valence=1\\\\(H^+]=5.10^{-5}\\\\pH=5-log5=4.3[/tex]
Which effect does an ocean have on the climate?
Answer:
A. ocean winds can carry moisture with them and can bring rain and fog over inland areas
Explanation:
It's "A. ocean winds can carry moisture with them and can bring rain and fog over inland areas' for K12 (OHVA to be exact)
Answer:
ocean currents regulate global climate, helping to counteract the uneven distribution of solar radiation reaching Earth's surface
Write equilibrium constant (KC) for the following reactions
1. N2(g) + O2(g) ⇌ 2NO(g)
2. N2(g) + 3H2(g) ⇌ 2NH3(g)
3. 2SO2(s) + O2(g) ⇌ 3SO3(g)
4. 2Fe(S) + 4H2O(g) ⇌Fe3O4(s) +4H2(g)
The equilibrium constant(Kc) is equal to the concentration of the products over the concentration of the reactants, and each coefficient of the compound in an equilibrium state
Further explanationThe equilibrium constant or Kc is the value of the concentration product in the equilibrium state of the substance in the right segment divided by the product of the substance in the left section, each of which has a reaction coefficient raised
solid (s) and liquid (l) have no concentration, so these two phases are not involved in the equilibrium constant KC (given the value = 1).
The equilibrium constant based on concentration (Kc) in a reaction
pA + qB -----> mC + nD
[tex]\tt Kc=\dfrac{[C]^m[D]^n}{[A]^p[B]^q}[/tex]
1. N2(g) + O2(g) ⇌ 2NO(g)
[tex]\tt Kc=\dfrac{[NO]^2}{[N_2][O_2]}[/tex]
2. N2(g) + 3H2(g) ⇌ 2NH3(g)
[tex]\tt Kc=\dfrac{[NH_3]^2}{[N_2][H_2]^3}[/tex]
3. 2SO2(g) + O2(g) ⇌ 3SO3(g)
[tex]\tt Kc=\dfrac{[SO_3]^3}{[SO_2]^2[O_2]}[/tex]
4. 2Fe(S) + 4H2O(g) ⇌Fe3O4(s) +4H2(g)
[tex]\tt Kc=\dfrac{[H_2]^4}{[H_2O]^4}[/tex]
The third test you read about uses the apparatus shown above to test for conductivity of electricity. If the bulb lights up, then the substance dissolved in the water is likely
Answer: A.ionic
Explanation:
Got it right
Answer:
Ionic
Explanation:
3Fe + 4H2O ‐----> Fe3O4 + 4H2
10 g of water vapour are passed on 16.8 g of iron which is heated till redness find the limiting reactant
The limiting reactant : Fe
Further explanationReaction
3Fe + 4H₂O ⇒ Fe₃O₄ + 4H₂
mass of H₂O = 10 g
mol H₂O (MW=18 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{10}{18}=0.56[/tex]
mass of Fe = 16.8 g
mol Fe(MW=56 g/mol) :
[tex]\tt mol=\dfrac{16.8}{56}=0.3[/tex]
Limiting reactant : the smallest ratio between mol : reaction coefficient
Fe :
[tex]\tt \dfrac{0.3}{3}=0.1[/tex]
H₂O :
[tex]\tt \dfrac{0.56}{4}=0.14[/tex]
Fe as limiting reactant
is a particle with a positive charge.:)
Determine the identity of a sample of gas at STP conditions, with a mass of 120.00 grams that occupies 67.2 L.
a) N2
b) Ar
c) He
d) Ne
explain your answer
Answer:
b) Ar
Explanation:
Given data:
Mass of sample gas = 120.00 g
Volume of gas = 67.2 L
Identity of gas = ?
Solution:
We will calculate the molar mass do identify the sample:
Number of moles of gas:
PV = nRT
1 atm×67.2 L = n×0.0821 atm.L/mol.K×273 K
67.2 atm.L = n × 22.42atm.L/mol
n = 67.2 atm.L / 22.42atm.L/mol
n = 3 mol
Molar mass of gas:
Number of moles = mass/molar mass
Molar mass = 120.00 g/3 mol
Molar mass = 40 g/mol
The given sample of a gas is Ar.
you have a container filled with 41 moles of neutral lithium. how much negative electric charge is contained in the electrons of all the lithium atoms in the container?
There are 7.407 x 10 25 electrons inside the container filled with 41 moles of neutral lithium.
Lithium is an element with an atomic number of 3. Since it has a neutral charge, the atomic number would be equal to subatomic particles proton and electron. Therefore, there 3 electrons in neutral lithium.
To solve for the number of electrons in a given number of moles of lithium, we are going to be using Avogadro's number to determine the number of lithium atoms present in the container.
Avogadro's number is the number of units, which could either be atoms, molecules, or particles, per mole of a substance and is equal to 6.02214076 x 10 23 units/mol.
(41 mol lithium)*(6.02214076 x 10 23 atoms/mol)*( 3 electrons/atom)
= 7.407 x 10 25 electrons
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write a balanced symbol equation for the complete combustion of butane
a compound containing only sulfur and nitrogen is by mass; the molar mass is g/mol. what are the empirical and molecular formulas of the compound?'
The chemical compound's empirical formula is NS.
The chemical compound's molecular formula is N4S4.
What does a chemical empirical formula look like?The empirical formula of a compound that gives the proportion (ratios) of the elements in the complex but not the precise number or arrangement of atoms is known as an empirical formula. This would be the compound's element to whole number ratio with the lowest value.What sort of empirical formula would that be?The chemical structure of glucose is C6H12O6. Every mole of carbon and oxygen is accompanied by two moles of hydrogen. Glucose has the empirical formula CH2O. Ribose has the chemical formula C5H10O5, which can be simplified to the empirical formula CH2O.
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the question you are looking for is
A compound containing only sulfur and nitrogen is 69.6% S by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound?
Question 3
Sugar is made of carbon, hydrogen, and oxygen atoms. Sugar is
Explanation:
sugar is a compound because the elements are chemically combined but it also can be dissolved, tho the sugar itself isn't a solution, only when added to water
I'll give brainliest
Answer:
the Potential Energy that is happened are all actions.
Explanation:
Potential energy is a property of a system and not of an individual body or particle; the system composed of Earth and the raised ball, for example, has more potential energy as the two are farther separated.
in other words
In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors
A hydrogel is composed of crosslinked polymer chains, which are highly water absorbent. The gels are mostly (mostly>90%) water. Liesegang line patterns are precipitation patterns that appear in a gel when a chemical reaction takes place when a diffusing chemical (reactant A) in a gel reaches a concentration that is just enough to react with the reactant B (already present and homogeneously distributed in the gel) to form a precipitate. This precipitate appears as a colored line in the gel. Once the precipitate forms, reactant A is consumed all – however, diffusion of A does not stop. A ions propagate deeper into the gel and form another line of the precipitate when the A concentration again reaches the threshold concentration, just enough to react with the reactant B.
In the system shown on the right, A=Cu2+ ions, B is CrO42-. Cu2+
ions diffuse from the solution at the top into the yellow-colored
gel, which has CrO42- solution. The Cu2+ ions react with CrO42-
ions to form the CuCrO4 precipitate. There are no Cu2+ ions
present in the gel before the diffusion. Assuming that the
concentration of Cu2+ does not change at the solution/gel interface
and is 4.0 mol/L, and it is 0 mol/L at the bottom of the gel for the
duration of the precipitate formation,
1) find the depth of the first precipitate line that would appear in
the gel if the threshold concentration for the line formation is 0.05
mol/L and the time for the line to appear is 5 hrs. The temperature
is 25oC. D25= 1.2x10-8 m2/s.
2) at which temperature the line would appear at the same distance from the start, but in 75 min? Qd= 40 kJ/mol
When fertilization occurs one half of the DNA comes from the __________
and one half from the
_________
Answer:
Father - Mother
Sperm - Egg and those fertilized are called a Zygote
Explanation:
Answer:
one half from the father and the other half from the mother
Explanation:
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How do you find the volume of a plastic army soldier?
O Use a formula such as length x width x height
Look on the bottom of the army soldier's foot
O Place on a beam balance
Place in water and see how much the water is displace
Use the formula such as length x width x height, first, look on the bottom of the army soldier's foot.
What is plastic made of?Through a polymerization or polycondensation process, plastics are created from natural resources such cellulose, coal, natural gas, salt, and crude oil. Plastics are made from organic, naturally occurring substances including cellulose, coal, natural gas, salt, and, of course, crude oil.
Is plastic a solid or a liquid?A thermoset polymer cannot be melted and reshaped once it has been created, despite the fact that all plastics undergo liquid phase during processing and solid phase upon completion. A polymer can have a variety of arrangements for its monomers.
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A group of kids are playing a game of marbles. In the game of marbles, the kids take turns using a large marble, called the shooter, to hit smaller marbles outside of a circle, usually drawn in the dirt. How is the law of conservation of momentum demonstrated in this game?
Answer:
Explanation:
mjiio[mk'pk oikiom[,l
Answer:
The bigger marble may hold more momentum
Explanation:
which is a polyatomic ion
Explanation:
Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms. The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.
How many moles are in 8.32 x 1024 molecules of CO2.
Answer:
13.82 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{8.32 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 13.820598...[/tex]
We have the final answer as
13.82 molesHope this helps you
What happened to the liquid in Titan's lake?
Answer:
Explanation: Liquid from the lakes may have evaporated and seeped into the surface; scientists suspect seasonal changes — from winter to summer — also played a role in the lakes' disappearance. This infrared-color mosaic of data from the Cassini Visual and Infrared Mapping Spectrometer (VIMS) shows the north pole of Titan
bigger size elements have low ionization energy and high shielding effect.why
Answer:
Ionization energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.
The ionization energy decreases as the size increases. The electrons get added to the new shell and the nuclear charge increases. But the effect of addition of new sheels overcomes the increase of nuclear charge.The valence shell moves far from the nucleus.
Thus the valence electron gets less tightly held by the nucleus and thus less energy is required to remove the valence electron.
Shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud, due to a difference in the attraction forces of the electrons on the nucleus. Thus as the size increases and the electrons move away from nucleus, the attractive forces decrease.
what is solvent and solute
Answer:
Solute=the substance which a solvent dissolve to produce homogeneous mixture
Solvent= the substance in which a solute dissolve to produce homogeneous mixture
Explanation:
solvent: The liquid in which a solute is dissolved to form a solution.
solute: The component in a solution, dissolved in the solvent.